dale...sonoma. california (figure 1, appendix a). the project site contains a main commercial...

Preparedfor

Mr. William M. SheaExecutor of Estate of Robert H. Bohna

285 Second StreetSonoma, California 95476

REPORT OF INVESTIGATION

870 BROADWAY

SONOMA, CALIFORNIA

JANUARY 2011

EBA Project No. 10-1639

Prepared by ( Supeisehy

LkKari Wester, R.E.A. avid Noren, R.E.A., Manager

Environmental Scientist Environmental Services

Reviewed by/:

Dale Soiheim, P.E.. R.E.A. E 3/3’(ct) /Principal Engineer / CE #30888 CIVLJ’

825 Sonoma Avenue, Suite C Santa Rosa, CA 95404 (707) 544-0784 FAX (707) 544-0866

a

Printed on Recycled Paper

TABLE OF CONTENTS

SECTION PAGE

1.0 INTRODUCTION .1

2.0 BACKGROUND INFORMATION 12.1 General 12.2 Site History 12.3 Regional Hydrogeologic Setting 1

3.0 FIELD INVESTIGATION 23.1 Soil Boring Advancement 2

3.1.1 Autobody/Alignment Building 23.1.2 Former Gasoline Service Station 3

3.1.2.1 Geophysical Survey 33.1.2.2 Soil Boring Advancement 3

3.1.3 Former Hydraulic Hoist Locations 33.1.4 Surface Soil Sampling 4

3.2 Soil Sample Collection 43.3 Groundwater Grab Sample Collection 43.4 Laboratory Testing 53.5 Equipment Decontamination and Borehole Abandonment 5

4.0 FINDINGS 54.1 Geology and Hydrogeology 54.2 Autobody/Alignment Building 54.3 Former Hydraulic Hoist Locations 64.4 Former Gasoline Service Station 6

4.4.1 Geophysical Survey 64.4.2 Soil Boring Advancement 6

4.5 Surface Soil Sampling 6

5.0 CONCLUSIONS 7

6.0 RECOMMENDATIONS 8

7.0 LIMITATIONS 8

8.0 REFERENCES 8

APPENDIX A - FIGURESAPPENDIX B - TABLESAPPENDIX C - BORING LOGSAPPENDIX D - CERTIFIED ANALYTICAL REPORTSAPPENDIX E - GEOPHYSICAL REPORT

L:\env\esa\1 639 Broadway\Phase II\ROPtoc.doc BA ENGINEERING

1.0 INTRODUCTION

Mr. William Shea, Executor of the Estate of Robert Bohna (Client), contracted with EBAEngineering (EBA) to perform a subsurface investigation at 870 Broadway in Sonoma,California, hereafter referred to as the project site (Figure 1, Appendix A). This report outlinesfindings from the investigation performed at various locations on the project site property. Thepurpose of this investigation was to determine if environmental impacts existed at the project sitefrom historic uses of the project site as identified in a Phase I Environmental Site Assessment(ERA, 2010a). The scope of work for this investigation was performed in general accordancewith EBA’s Cost Estimate for Environmental Services dated August 11, 2010 (ERA, 20 lOb).

2.0 RACKGROUNI INFORMATION

2.1 General

The project site is located at 870 Broadway in Sonoma. California (Figure 1, Appendix A). Theproject site contains a main commercial building with an automotive repair shop and showroom,an alignment building and a historic school building. The project site buildings are currentlyused for automotive sales, repair and maintenance. The surrounding properties includeresidential properties to the east and commercial properties to the north of the project siteproperty. Broadway borders the western portion of the project site property and East MacArthurStreet borders the southern portion of the project site. A site plan showing the general sitefeatures and environmental sampling locations is presented as Figure 2 (Appendix A).

2.2 Site History

The project she was originally developed in the late 1860’s and used as a school until the early1920’s. The project site was then developed commercially some time between 1923 and 1941and has been used for automotive purposes including sales, services and maintenance since thattime- In September 2010 a Phase I Environmental Site Assessment completed at the siteidentified four areas of potential concern on the project site property as follows:

• The use of the southwestern portion of the project site as a gasoline services station in theearly 1940’s.

• The use of one project site building for autobody work including body work and painting.• The use of former underground hydraulic hoists in the shop and the autobody/alignment

buildings.• Observations of stained soil in the area between the shop and historic school building.

This report provides findings and recommendations with regard to the potential impacts fromthese structures and/or uses on the project site over time.

2.3 Regional Hydrogeologic Setting

The project site is located within the Coast Range Geomorphic Province of northern California.

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The Coast Range Geomorphic Province is generally characterized as a series of northwesttrending elongated ridges and valleys that are a result of folding and faulting. The provinceincludes many separate ranges, coalescing mountain masses, and several major structural valleys.The regional structure of the Coast Range is considered to be a number of independent faultblocks with different stratigraphic and structural histories.

The project site is located in the Valley of the Moon along the southern extension of theKenwood Syncline. The Kenwood Syncline is a northwest-trending structural downfold formedduring the Pliocene Epoch. The Valley of the Moon is flanked to the northeast by the MayacamaMountains and to the southwest by the Sonoma Mountains (California Department of WaterResources [DWRI. 1975).

Surface deposits in this region consist of Quaternary alluvium comprised of unconsolidatedclays, silts, sands and gravels. These surface deposits, in turn, are underlain by Glen EllenFormation andlor Sonoma Volcanic materials. The Glen Ellen Formation is ofPliocene-Pleistocene age and consists of heterogeneous mixtures of consolidated clays, silts,sands and gravels. The Sonoma Volcanics are of middle to late Pliocene age and consist ofmixed volcanic materials, including flows, dikes, plugs, and beds of andesite, rhyolite, basalt,tuff breccia, and tuff (DWR, 1975).

3.0 FIELD INVESTIGATION

3.1 Soil Boring Advancement

On November 1, 2010, EBA personnel supervised the drilling of six soil borings (SB-i throughSB-6) by RSI Drilling, Inc., a C-57 licensed driller headquartered in Woodland, California.

Prior to the start of drilling activities, the drilling locations were marked for UndergroundService Alert (USA) in order to locate subsurface utilities. In addition, a drilling permit wasobtained from the County of Sonoma Department of Health Services — Environmental HealthDivision.

A truck mounted direct push drill rig equipped with two-inch diameter hollow-stem augers wasused to advance the soil borings to depths ranging from 12 to 26 feet below ground surface(BGS). The locations of the soil borings are depicted on Figure 2 in Appendix A and werechosen to assess potential environmental impacts from historic uses and/or structures at theproject site.

3.1.1 Autobody/Alignment Building

Four soil borings (SB-i through SB-4) were advanced on all four sides of theautobody/alignment building. Please see Figure 2, Appendix A for the boring locations. Soilborings. SB-i and SB-2. were advanced to 24 feet BGS and soil borings, SB-3 and SB-4, wereadvanced to 26 feet BGS.

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3.1.2 Former Gasoline Service Station

Two phases of investigation were completed in the area of the former gasoline service station.The first phase consisted of the completion of a geophysical survey to identify subsurfacestructures (i.e. buried tanks, metallic objects. building foundations etc). The second phaseconsisted of the advancement of a soil boring in the expected downgradient location from thefornier station footprint for the purpose of collecting soil and groundwater samples for chemicalanalysis. The following subsections provide details of the work completed in this area of theproject site property.

3.1.2.1 Geophysical Survey

The Phase I Environmental Assessment documented the historic presence of a gasoline servicestation located on the southwestern corner of the project site. Remnants of the fuel dispensingisland are present within the sidewalk adjacent to Broadway.

A geophysical survey was performed in the area of the former gasoline service station todetermine if underground fuel storage tanks (USTs), buried structures and/or buildingcomponents existed at the project site property. The survey was conducted by NorcalGeophysical Consultants under the supervision of EBA Engineering. The approximate size ofthe area of interest measured 50 feet by 85 feet and included the areas of the existing sidewalk inwhich remnants of fueling dispensers are visible in the sidewalk adjacent to Broadway.

The survey used a magnetometer (MAG) and electromagnetic conductivity (EM) meter on a 5-ft.grid to define localized magnetic and conductivity variations that may be due to subsurfacemetallic and non-metallic debris. The survey also used ground penetrating radar to further definethe nature of MAG and EM anomalies as well as an electromagnetic metal detector.

A copy of the Geophysical Investigation from Norcal Geophysical is presented in Appendix E.

3.1.2.2 Soil Boring Advancement

One soil boring (SB-5) was advanced to a depth of 24 feet BGS in the area of the formergasoline service station. The boring was installed following the completion of the field surveyand mark out of the geophysical survey. The boring was placed in the anticipated downgradientlocation from the former station footprint as determined by groundwater flow data of severalnearby site investigations.

3.1.3 Former Hydraulic Hoist Locations

One soil boring (SB-6) was advanced to a depth of 12 feet BGS in the main shop building in thearea of a former hydraulic hoist. The presence of the former in-ground hydraulic hoist had beendocumented in this area of the project site during the Phase I Environmental Site Assessment.The hoist had reportedly been removed some time in the past with no regulatory oversight or soilsampling. The boring was installed within the footprint of the fonner hoist to collect soilsamples from the anticipated total depth of the former hoist.

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On November 22, 2010 hand auger boring HA-3 was advanced within the alignment shop in asecond area in which an in-ground hydraulic hoist was historically used at the project site. Theboring was advanced using a hand auger due to access limitations in this structure. The boringwas advanced to a depth of seven feet BGS for the purpose of collecting a soil sample forchemical analysis.

3.1.4 Surface Soil Sampling

Two hand auger borings (HA-i and HA-2) were advanced in the area of soil staining betweenthe shop and the historic school building as identified in the Phase I Environmental SiteAssessment. The hand auger borings were advanced to depths of 20 and 24 inches BGS,respectively. Two soil samples were collected from the surface of each hand auger boring inaddition to samples collected at depths of 16 to 20 inches in HA-i and 18 to 24 inches in HA-2.Please refer to Figure 2 in Appendix B for Hand Auger locations.

3.2 Soil Sample Collection

Continuous core soil samples were collected from each boring from the ground surface to totaldepth of the boring. Selected soil samples were collected from the recovered drilling core in two-inch diameter by six inch long steel tubes. Upon collection the soil samples were sealed andplaced under refrigerated conditions pending transport to a State certified analytical laboratoryfor chemical analysis.

The subsurface conditions encountered in each boring were logged in accordance with theUnified Soil Classification System. In addition, soil samples were screened for the presence ofvolatile organic compounds (VOCs) during the course of drilling using a photo-ionizationdetector (PID). Please refer to the soil boring logs enclosed in Appendix C for a summary of thesampling intervals. PID readings, and subsurface lithology recorded during the drilling.

3.3 Groundwater Grab Sample Collection

Groundwater grab samples were collected from each of the boreholes upon completion of thesoil sampling activities with the exception of soil boring SB-6 which was installed for thepurpose of collecting soil samples from the former hoist location. Once the final depth wasreached in each borehole, the drilling tooling was removed and one-inch diameter poly-vinylchloride casing and screen were temporarily placed within the borehole to allow for groundwaterinfiltration. The groundwater grab samples were collected using a disposable bailer.

Upon sample collection, the groundwater grab samples were transferred into properly labeled.laboratory supplied sample containers. The groundwater grab samples were subsequently loggedon a chain-of-custody form and placed under refrigerated conditions pending transport to KPrime Inc., a California State-certified analytical laboratory located in Santa Rosa, California, forchemical analysis.

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3.4 Laboratory Testing

Grab groundwater and soil samples collected from the soil borings SB-i through SB-5 and handauger borings HA-i and HA-2 were analyzed for Gasoline Range Organics (GRO), Diesel RangeOrganics (DRO) and Heavy Range Organics (HRO) using EPA Method 8015. The groundwatersamples were also analyzed for volatile organic compounds using EPA Method 8260B and themetals cadmium, chromium, lead, nickel and zinc using EPA Method 3050/6020.

The soil sample collected from soil boring SB-6 was analyzed for DRO and HRO using EPAMethod 8015 in addition to polychlorinated biphenyls (PCBs) using EPA Method 3550/8082, thevolatile organic compounds benzene, toluene, xylenes and ethylbenzene (BTEX) using EPAMethod 8260B and the metals cadmium, chromium, lead, nickel and zinc using EPA Method3050/6020.

The soil sample from the hand auger HA-3 was analyzed for DRO using EPA Method 8015 andBTEX constituents by EPA Method 8260B.

3.5 Equipment Decontamination and Borehole Abandonment

The drilling and sampling equipment were steam cleaned between each boring to minimize crosscontamination. Decontamination water from the process was retained on-site in properly labeledDOT-17H 55-gallon drums pending characterization and disposal.

Following the completion of the soil and groundwater sampling activities, the soil borings wereproperly abandoned by backfilling with cement grout to six inches BGS and capped with asphaltto grade. The hand auger borings were backfilled with native material.

4.0 FINDINGS

4.1 Geology and Hydrogeology

Materials encountered during drilling activities consisted of varying amounts of gravel, sand, siltand clay. Groundwater was initially encountered during the drilling activities at depths rangingfrom eight to 22 feet BGS. Depth to groundwater was observed to subsequently rise after thedrilling was completed which may be indicative of confined or semi-confined groundwateraquifer conditions. Please refer to the soil boring logs included in Appendix C for a completedescription of the materials encountered during the drilling activities.

4.2 Autobody/Alignment Building

Soil and groundwater samples collected from soil borings SB-i through SB-4 in the area of thealignment shop did not indicate detections of petroleum hydrocarbons or VOCs above laboratorydetection limits. Metals including chromium, lead, nickel and zinc were detected in all soil andgroundwater samples collected from these borings with the exception of lead in soil boring SB-4

EB4ENGINEERINGL:\.env\esa\1639 Broadway’Phase II’ROflROI 2010.doc 5

grab groundwater sample. Cadmium was not detected above laboratory detection limits in any ofthe soil or groundwater samples collected from these soil borings.

Please refer to Tables I through 6 in Appendix B for soil and groundwater analytical results fromsoil borings SB-i through SB-4.

4.3 Former Hydraulic Hoist Locations

Soil samples collected from the former hoist locations (SB-6 and HA-3) did not indicate thepresence of petroleum hydrocarbons or PCB’s above the laboratory detection limit- Metalsincluding chromium, lead, nickel and zinc were detected in the soil sample collected from 88-6.

Please refer to Tables 7 and 8 in Appendix B for soil and groundwater analytical results fromSB-6 and HA-3.

4.4 Former Gasoline Service Station

4.4.1 Geophysical Survey

The geophysical survey indicated a large subsurface debris pile in the footprint of the formergasoline service station. The subsurface debris was indicated as being consistent with a structurefoundation. The survey did not indicate the presence of buried metallic objects such as hoists orUST’s within the survey area. Please refer to the report prepared by NorCal Geophysical datedDecember 10, 2010 that is included in Appendix E.

4.4.2 Soil Boring Advancement

Soil and groundwater samples collected from soil boring 58-5 located in the expecteddowngradient location of the gasoline service station did riot indicate the presence of petroleumhydrocarbons or VOCs above laboratory detection limits. The metals chromium, lead, nickeland zinc were detected in the soil and groundwater samples collected from SB-5

Please refer to Tables 9 through 13 in Appendix B or soil and groundwater analytical resultsfrom SB-5.

4.5 Surface Soil Sampling

Surface soil samples collected on the east side of the main shop indicated DRO and 1-IRO atconcentrations of 575 and 1.030 milligrams per kilograms (mg/kg). respectively in hand augerboring HA-i and 11.700 and 17,900 mg/kg respectively, in hand auger boring HA-2. Please notethat the laboratory flagged the DRO detections as having heavier hydrocarbons contributing tothe diesel range quantitation.

The deeper soil samples collected from the hand auger borings at depth intervals of 16 to 20inches BGS in hand auger boring HA-i and 18 to 24 inches BGS in hand auger boring I-IA-2were non detect for both DRO and HRO.

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Several VOCs were detected in the soil sample collected from the ground surface in hand augerboring HA-2 including the butylbenzene, sec-Butylbenzene, ethylbenzene. isopropyltoluene,naphthalene, n-propylbenzene, toluene, 1 ,2,4-trimethylbenzene, 1,3 ,5-trimethylbenzene, m,pxylenes and o-xylenes. These VOC detections ranged in concentration from p-isopropyltoleuneat 18.5 micrograms per kilogram (ugfkg) to 1,3,5-trimethylbenzene at 472 ug/kg. No other VOCswere detected in the HA-i and HA-2 soil samples.

Metals including cadmium, chromium, lead, nickel and zinc were detected in all the soil samplescollected from these hand auger boring samples with the exception that cadmium was notdetected in both the deeper soil samples. The concentrations of lead in these samples wassignificantly elevated.

Please refer to Tables 14 through 16 in Appendix B for analytical results from HA-i and HA-2.

Copies of the all of the corresponding Certified Analytical Reports (CARs) and chain-of-custodyrecords are enclosed in Appendix D.

5.0 CONCLUSIONS

Based on results from the soil and groundwater grab samples collected during this investigation,EBA presents the following conclusions:

• Based on soil and groundwater data collected from soil borings SB- 1 through SB-4. thereappears to be no impacts to soil or groundwater from the historic uses of theautobody/alignment building.

• Based on soil data collected from soil borings SB-6 and HA-3, there appears to be noimpacts from the former hydraulic hoists located in the main shop building arid thealignment shop.

• Based on the findings from the geophysicaL survey it appears that subsurface debris andrenmants of the former gasoline service station are present on the southwest side of theproject site property. The geophysical survey did not indicate the presence of buriedmetallic objects such as hydraulic hoists or USTs.

• Soil and groundwater samples collected from soil boring SB-S in the area of the formergasoline service station did not indicate the presence of petroleum hydrocarbons orvolatile organic compounds.

• Soil data collected from the area located between the main shop and the former schoolstructure indicated shallow surface impacts from middle to heavy range petroleumhydrocarbons in the diesel and motor oil weight range. In addition, significantconcentrations of lead were detected in the surface soil samples in this area of the projectsite. The concentrations of these compounds exceed regulatory limits as defined by the

L:en\tsa\l639 BwadwayWhase II\ROI\RO1 2010.doc 7

Environmental Screening Levels as published by the San Francisco Bay Regional WaterQuality Control Board. Deeper soil samples collected from this area indicatedsignificantly lower to non-detectable levels of these compounds.

6.0 RECOMMENDATIONS

Based on soil and groundwater data collected during this investigation. EBA recommends thefollowing:

• Remove petroleum hydrocarbon and lead impacted soil from the area between the mainshop building and the historic school building.

• No additional investigation is warranted regarding the former gasoline services station,former hydraulic hoists or historic uses of the autobody/alignment building.

7.0 LIMITATIONS

This report was prepared in accordance with generally accepted standards of environmentalgeological practice at the place and time this investigation was performed. This warranty is inlieu of all other warranties, either expressed or implied. This investigation was conducted solelyfor the purpose of evaluating environmental conditions of first-encountered groundwater withrespect to environmental conditions previously identified at the site. No soil engineering orgeotechnical references are implied or should be inferred. Evaluation of the geologic conditionsat the site for the purpose of this investigation is made from a limited number of observationpoints. Subsurface conditions may vary away from the data points available. Additional work,including further subsurface investigation, can reduce the inherent uncertainties associated withthis type of investigation. This report has been prepared solely for the Client and any reliance onthis report by third parties shall be at such party’s sole risk.

8.0 REFERENCES

California Department of Water Resources, Evaluation of Groundwater Resources:Sonoma County, December 1992.

EBA Engineering, 2010a. Phase I Environmental Site Assessment. 870 Broadway. Sonoma,California. July 2010.

EBA Engineering, 2010b; Cost Estimate for Environmental Senices, 870 Broadway. Sononia.Caftfornia. September 11, 2010.

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APPENDIX C

BORING LOGS

ERA Engineering BORING NUMBER SB-i825 Sonoma Avenue4h:PAGE 1 OF 1Santa Rosa, CA 95404

Telephone: 707-544-0784Fax: 707-544-0866

CLIENT Mr. William Shea PROJECT NAME 870 Broadway

PROJECT NUMBER 10-1639 PROJECT LOCA11ON 870 Broadway Street. Sonoma, CA

DATE STARTED 11/1/10 COMPLETED 1111/10 GROUND ELEVA11ON --- CASING EL.EVA110N -—

DRIWNG CONTRACTOR RSI Drillino GROUND WATER LEVELS; HOLE SIZE 2 inches

DRILLING METHOD Direct Push AT liME OF DRILLING 22.0’ BGS

LOGGED BY C. Jenkins (ERA) CHECKED BY D. Noren (ERA) AT END OF DRIWNG

NOTES 6hrs AFTER DRILLING 12.4 BGS

LU0-

€ .

±8 MATERIALDESCRIPTION S ig_J ow 0° D CD ° 0

<0

Q5 ASPHALT——%--

SANDY CLAY WITH GRAVEL, moist, yellowish red (5YR 4/6), 20% fine to medium gravel, 20% fine tocoarse sand, 60% fines, well graded, no HC odor. 0.0

80

30% fine to medium gravel 30% line to coarse nd 40 fines no HC odor 00

SW GRAVELLY SAND, moist, yellowish red (5YR 4/6), 40% fine to medium gravel, 50% fine to coarse-

O__o5.F1OH9OdOr-

SILTY SAND, moist, yellowish red (SYR 4/6), 60-70% fine sand, 30-40% fines, no HC odorSc

11.0SILTY SAND WITH GRAVEL, yellowish red (5YR 4/6), 30% fine to medium gravel, 40% fine to 0 0

-

medium sand, 30% fines, no HC odor

15trace gravel, 50-60% fine to medium sand, 40-50% fines

2 SW

moist to wet, 10-15% fine to medium gravel, 60% fine to medium sand, 25-30% fines, no HC odor

0

- :•:•:• 2free water between grains

- 0.0

- - £ 42 -

Bottom of Borehole at 24.0 feet BGS.

‘p

-J-JUJ

0.F

I

-J

iiizIn

—— —

EBA Engineering BORING NUMBER SB-2825 Sonoma Avenue

ENGINEER/Mg PAGE 1 OF 1Santa Rosa, CA 95404Telephone: 707-544-0784Fax: 707-544-0866


PROJECT NUMBER 10-1639 PROJECT LOCATION 870 Broadway Street, Sonoma, CA

DATE STARTED 11/1/10 COMPLETED 11)1/10 GROUND ELEVATION —- CASING ELEVATION

DRILUNG CONTRACTOR RSI Drilling GROUND WATER LEVELS: HOLE SIZE 2 inches

DRILIJNG MEtHOD Direct Push V AT TIME OF DRILLING 15.0’ BGS

LOGGED BY C. Jenkins (EBA) CHECKED BY D. Noren (EBA) AT END OF DRILUNG —

NOTES 4.75hrs AFTER DRILIJNG 8.9’ BGS

—— ——0->o:r w

g REMARKS MATERIALDESCRIPTION S0 DC ‘-. 0

<C).)

SB-9i©9’

SM

SW

5

10

15

20

-

SILTY SAND, dry to slightly moist, brown (1OYR 513), 70% fine sand, 30% fines,no HC odor

6.0SILTY SAND WITH GRAVEL, moist yellowish red (5YR 4/6), 10-15% fine tomedium gravel, 60% fine to medium sand, 25-30% fines, no HC odor, wellgraded.

5110-15% fine to medium gravel, 50-60% fine to medium sand, 25-40% fines

10% fine gravel, 60% fine to medium sand, 30% fines2

free water between grains

trace gravel, 70% fine to medium sand, 30% fines

24.0Bottom of Borehole at 24.0 feet BOS.

0.0

0.0

0.0

0.0

0.0

0.0

0.0

15

0

0Q

z0

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0

a,‘00

-J-JLJJ

UizUJfl


ENGINEERING PAGE 1 OF 1Santa Rosa, CA 95404Telephone: 707-544-0784Fax: 707-544-0866


PROJECT NUMBER 10-1639 PROJECT LOCA11ON 870 Broadway Street, Sonoma, CA

DATE STARTED 11/1/10 COMPLETED 11/1110 GROUND ELEVATION --- CASING ELEVATION

: DRILUNG CONTRACTOR RSI Drilling GROUND WATER LEVELS: HOLE SIZE 2 inches

DRILLJNG METHOD Direct Push V AT TIME OF DRILUNG 21.0! BGS

LOGGED BY C. Jenkins (ERA) CHECKED BY D. Noren CEBA) AT END OF DRIlLING

NOTES 3.25hrs AFTER DRILIJNG 13.8 BGS

UI0

2 —

ao t zx0 3 MATERIALOESCRIPTION —<

<Rag REMARKS < 2>

0 0 00<U,

SILTY SAND, moist, yellowish red (5Th 4/6), 60-70% fine sand, 30-40% fines,free water betwwen grains from surface infiltration?

0.0

5

-

-::. dw to slightly moist, 60% fine sand, 40% fines 0,0

10increase in grain size, free water in coarser lenses

- : 0.0

SM::

15

- SB-3@16’

o

o0.20

. 20gravei lense

2s

- 70% fine to medium fine sand, 30% fines 0.0

‘C

- .“ 26 -

Boltom of Borehole at 26.0 feet 605. —

0-

-s

Ui2UICD

______ _. _______-


ENGINEFRING PAGE 1 OF 1Santa Rosa, CA 95404Telephone: 707-544-0784Fax: 707-544-0856


PROJECT NUMBER 10-1639 PROJECT LOCA11ON 870 Broadway Street, Sonoma, CA

DATE STARTED 11/1/10 COMPLETED 11/1/10 GROUND ELEVA11ON --- CASING ELEVA11ON

DRILLING CONTRACTOR RSI Drilling

DRILLING METHOD Direct Push

GROUND WATER LEVELS:

AT liME OF DRILLING 1 6.5 BOS

HOLE SIZE 2 inches

LOGGED BY C. Jenkins (EBAI

NOTES

CHECKED BY D. Noren (EBA) AT END OF DRILLING

________

2hrs AFTER DRILLING 11.2 BGS

SILTY SAND WITH GRAVEL, dry to slightly moist, yellowish red (5YR 4/6),10-20% fine to medium gravel, 60% fine to medium sand, 20-30% fines, no HCodor

4.0SILTY SAND, moist, yellowish red (SYR 4/6), 70-80% fine sand, 20-30% fines,no HC odor

22.0

5,

gravel lense

70-80% fine to medium sand, 20-30% fines, no HC odor

hard drilling

trace fine gravels, 80% fine to medium sand, 20% fines

2 free water between grains

gravel lense

SANDY CLAY, dry, yellowish red (5YR 4/6), 10-20% fine sand, 80-gO% fines,medium plasticity, no HC odor

24.0SILTY SAND, moist to wet, yellowish red (5YR 4/6), 60% fine sand, 40% fines

26.0Bottom of Borehole at 26.0 feet SOS.

rREMARKS ° -8 MATERIALDESCRIPTION -I -og

°‘ -igCD

! .!

SM

SM

CL

SM

SB-4@16’

0.0

0.0

0-0

0.0

0-0

10

15

20

25

EBA Engineering BORING NUMBER SB-5825 Sonoma Avenue-

ENGINFIRING PAGE 1 OF 1Santa Rosa, CA 95404Telephone: 707-544-0784Fax: 707-544-0866


PROJECT NUMBER 1 0-1 639 PROJECT LOCATION 870 Broadway Street. Sonoma. CA

DATE STARTED 11/1/10 COMPLETED 11/1/10 GROUND EL.EVA11ON —- CASING ELEVA11ON

DRILIJNG CONTRACTOR RSl Drilling GROUND WATER LEVELS: HOLE SIZE 2 inches

DRILLING METHOD Direct Push V AT TIME OF DRILLING 8.0 BGS

LOGGED BY C. Jenkins (EBA) CHECKED BY D. Noren (EBA) AT END OF DRILLING

NOTES 1hrsAFTERDRILLING 6.0805

Lii0->-r

H-t. REMARKS0

<Co

0

F-C

MATERIAL DESCRIPTION

—z

ow

S0.0.

00-

I

0- t

0

0

SM2

5

10

15

20

SB-5@16’

— —Ii-ISILTY SAND WITH GRAVEL, moist, yellowish red (5YR 4/6), 10% fine tomedium gravel, 70% fine to coarse sand, 20% fines, no HC odor

tree water between grains

trace gravel. 50-60% sand, 40-50% fines

16.0SANDY CLAY, moist, yellowish red (5YR 4/6), 20% fine sand, 80% fines,medium plasticity, no HC odor

sandy Iense with trace fine gravel

30-40% fine sand, 60-70% fines

24.0Bottom of Borehole at 240 feet 8GS.

0.0

0.0

0.0

0.0

CL

0

C,U,

0

a‘p‘C

C‘C0

0,‘0

-J-Jw

aF

I‘0

LUzLU

EBA Engineering BORING NUMBER SB6825 Sonoma Avenue

ENGINEERING PAGE 1 OF ‘ISanta Rosa, CA 95404Telephone: 707-544-0784Fax: 707-544-0866


PROJECT NUMBER 10-1639 PROJECT LOCAEON 870 Broadway Street, Sonoma, CA

DATE STARTED 11/1/10 COMPLETED 11/1110 GROUND ELEVATION --- CASING ELEVATION

_________

DRILLING CONTRACTOR R51 Drjjjjn GROUND WATER LEVELS;

DRILLING METhOD Direct Push AT liME OF DRILU NG

— ?-

MATERIAL DESCRIPTION —Z>

— LJJow 00 0 0

-nt2E -

SANDY CLAY, damp to moist, yellowish red (5YR 4/6), 30% fine sand, 70%tines, medium plasticity, no HC odor

0.0

LOGGED BY C. Jenkins (EBA) CHECKED BY D. Noren (EBA) AT END OF DRIWNG

NOTES AFTER DRIWNG

Ui0->-cx:I-Ui

€ REMARKS0

<C))

0

HOLE SIZE 2 inches

5

10

CL

SB-6@10’

increasing sand to 40-50%

organics

2.0Bottom of Borehole al 12.0 feet BGS.

00

0.0

V

a

00

—z0

(24

040a01

a

-J-Jw

D.

Ia-J4

wzwU,

APPENDIX D

CERTIFIED ANALYTICAL REPORTS

rcv DEC-

K PRIME, Inc.CONSULTING ANALYTICAL CHEMISTS 3621 Westwind Blvd.

Santa Rosa CA 95403Phone: 707 527 7374FAX: 707 527 7879

TRANSMITtAL

DATE: 11/23/2010

TO: MR. DAVID NOREN ACCT: 9986EBA ENGINEERING PROJ: 10-1645825 SONOMA AVENUE

SANTA ROSA, CA 95404

Pnone: 707-544-0784

Fax: 707-544-3866

Email: [email protected]

000re’@ebagrcuD CO

FROM: Richard A. Kagel.

Laboratory Director l<J’

SUBJECT: LABORATORY RESULTS FOR YOUR PROJECT 10-1645

Enclosed please find K Primes laboratory reports for the following samples:

SAMPLE ID TYPE DATE TIME KPI LAB #SB-1@10 SOIL 11/16/10 10:00 8693358-236 SOIL 1:1:6/ic 11:15 5593c

58-2611 SOL 11/16/:0 21:30 [email protected] SOL 11/16/10 :3:5 86935S3•3@C SoIL 11/16/10 lt:00 86937SB-4@11 SOIL l/611C 1:50 8693858-507.5 SOIL 1:1:6/ic 16:00 85939

The above listed sample group was received on 11/17/10 and tested as requestedon the chain of custody document.

P’ease cali me i’ you have ary questions or reed further i’fornation.TharK you for this opportunity to be of service.

K PRIME, INC. SAMPLE ID: SB-1@10LABORATORY REPORT LAB NO: 86933

SAMPLE TYPE: SOILK PRIME PROJECT: 9986 DATE SAMPLED: 11/16/2010CLIENT PROJECT: 10-1645 TIME SAMPLED: 10:00

BATCH#: 11171051METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 5035/8260 UNITS: Jg/Kg

COMPOUND NAME CAS NO. REPORTING SAMPLELIMIT CONC

BENZENE 71-43-2 15.0 NDTOLUENE 108-88-3 15.0 NDETHYLBENZENE 100-41-4 15.0 NDXYLENE (M+P) 1330-20-7 15.0 NDXYLENE (0) 1330-20-7 15,0 ND

SURROGATE RECOVERY %DIBROMOFLUOROMETHANE 103TOLUENE-D8 1004-BROMOFLUOROBENZENE 98

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA -NOT APPLICABLE OR AVAILABLE

APPROVED BY: J)DATE: ,,I2;I-kic,

PAGE 1 OF 1



BATCH#: 11171051METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 5035/8260 UNITS: pg/Kg


BENZENE 71-43-2 1.37 NDTOLUENE 108-88-3 1.37 NDETHYLBENZENE 100-41-4 137 NDXYLENE(M+P) 1330-20-7 1.37 NDXYLENE (0) 1330-20-7 1.37 ND

SURROGATE RECOVERY

_______

DIBROMOFLUOROMETHANE

________

TO LU E N E-D8

________

4-BROMOFLUOROBENZENE

ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMIT

NA -NOT APPLICABLE OR AVAILABLE

NOTES:

9410098

APPROVED BY:DATE: eib-3boio

PAGE 1 OF 1

K PRIME, INC.LABORATORY REPORT

K PRIME PROJECT: 9986CLIENT PROJECT: 10-1645

SB-2@1 186935SOIL11/16/20 1011:30

BATCH#: 11171051DATE ANALYZED: 11/18/2010

LIMIT

SURROGATE RECOVERY %DIBROMDFLUOROMETHANE 102TOLUENE-D8 1004-BROMOFLUOROBENZENE 08

SAMPLE ID:LAB NO:

SAMPLE TYPE:DATE SAMPLED:TIME SAMPLED:

METHOD: VOLATILE ORGANIC COMPOUNDSREFERENCE: EPA 503518260 UNITS: pg/Kg

COMPOUND NAME CAS NO. REPORTING SAMPLECONC

BENZENE 71-43-2 148 NDTOLUENE 108-88-3 148 NDETHYLBENZENE 100-41-4 148 NDXYLENE (M+P) 1330-20-7 1.48 NDXYLENE (0) 1330-20-7 1.48 ND

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMIT


APPROVED BY:DATE: ‘I ta-3 Iic

PAGE 1 OF 1

K PRIME, INC. SAMPLE ID: [email protected] REPORT LAB NO: 86936


BATCH#: 111710S1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 503518260 UNITS: jig/Kg


BENZENE 71-43-2 153 NDTOLUENE 108-88-3 153 NDETHYLBENZENE 100-41-4 1.53 NDXYLENE (M+P) 1330-20-7 153 NDXYLENE (0) 1330-20-7 153 ND


NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA -NOT APPLICABLE OR AVAILABLE

APPROVED BY: 4.JDATE: It

PAGE 1 OF 1


SAMPLE TYPE: SDILK PRIME PROJECT: 9986 DATE SAMPLED: 11/16/2010CLIENT PROJECT: 10-1645 TIME SAMPLED: 14:00

BATCH#: 111710S1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 5035/8260 UNITS: pg/Kg


IBENZENE 71-43-2 116 ND

ITOLUENE 108-88-3 116 ND[EIHYLBENZENE 100-41-4 116 NDXYLENE (M+P) 1330-20-7 1.16 NDXYLENE (0) 1330-20-7 1.16 ND

SURROGATE RECOVERY %DISROMOFLUOROMETHANE 108TOLUENE-D8 1014-BROMOFLUOROBENZENE 100



APPROVED BY:

__________________

DATE: (iId3/tIO

PAGE 1 OF 1



BATCH#: 111710S1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 503518260 UNITS: pg/Kg


BENZENE 71-43-2 157 NDTOLUENE 108-88-3 157 NDETHYLBENZENE 100-41-4 157 NDXYLENE (M+P) 1330-20-7 157 NDXYLENE (0) 1330-20-7 157 ND




APPROVED BY: JJDATE: sIIa3hvtv

PAGE 1 OF 1

K PRIME, INC. SAMPLE ID: [email protected] REPORT LAB NO: 86939


BATCH#: 111710S1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010REFERENCE: EPA 503518260 UNITS: g/Kg


BENZENE 71-43-2 1.33 NDTOLUENE 108-88-3 1.33 NDETHYLBENZENE 100-41-4 1.33 NDXYLENE (M+P) 1330-20-7 1.33 NDXYLENE (0) 1330-20-7 1.33 ND




APPROVED BY:

_____________________

DATE: IdP,3!>niv

PAGE 1 OF 1



METHOD: DRO SAMPLE TYPE: SOILREFERENCE: EPA 8015B UNITS: mg/Kg

SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE DROSAMPLED ID DATE ANALYZED CONC PATrERN

SB-1@10 86933 11/16/10 111710S1 11/17/10 11/17/10 10.0 287SB-2@6 86934 11/16/10 111710S1 11/17/10 11/17/10 10.0 ND

SB-2@11 86935 11/16/10 111710S1 11/17/10 11/17/10 10.0 [email protected] 86936 11/16/10 111710S1 11/17/10 11/17/10 10.0 NDSB.3@10 86937 11/16/10 111710S1 11/17/10 11/17/10 10.0 NDSB-4@1I 86938 11/16/10 111710S1 11/17/10 11/17/10 10.0 [email protected] 86939 11/16/10 111710S1 11/17/10 11/17/10 10.0 ND

with Silica Gel CleanupMRL

Diesel Range Organics (C12-C34)Not Detected at or above the statedNot Applicable or AvailableMethod Reporting LimitTypical pattern for dieselHeavier hydrocarbons contributing to diesel range quantitationHeavier hydrocarbon than dieselLighter hydrocarbon than dieselUnknown hydrocarbon with a single peakUnknown hydrocarbon with several peaks

APPROVED BY:DATE:

NOTES:DRONDNA

MRLADACAJAKAEAN

ir l24hDIo

PAGE 1 OF 1

K PRIME, INC.LABORATORY METHOD BLANK REPORT METHOD BLANK ID: B11I71OS1


METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 503518260 UNITS: ig)Kg


BENZENE 71-43-2 1.50 NDTOLUENE 108-S8-3 1.50 NDETHYLBENZENE 100-41-4 1.50 NDXYLENE (M+P) 1330-20-7 1.50 NDXYLENE (0) 1330-20-7 1.50 ND




K PRIME, INC. SAMPLE ID: B111710S1

LABORATORYQC REPORT SPIKE ID: L11171OS1DUPLICATE ID: 011171051

METHOD: VOLATILE ORGANIC COMPOUNDS SATCH#; 11171081

REFERENCE: EPA 5035/8260 SAMPLE TYPE: SOILUNITS: pg/Kg

ACCURACY (MATRIX SPIKE)

PARAMETER SPIKE SAMPLE SPIKE RECOVER LIMITSADDED RESULT RESULT (%) (%)

1,1 DICHLOROETHENE 30.0 ND 30.3 101 60-140

BENZENE 30.0 ND 29.6 99 60-140TRICHLOROETHENE 30.0 ND 27.1 90 60-140

TOLUENE 30.0 ND 27.7 92 60-140CHLOROBENZENE 30.0 ND 28.9 96 60-140

PRECISION (SPIKE DUPLICATE)

COMPOUND NAME REPORTING SPIKE DUPLICATE RPD LIMITSLIMIT RESULT RESULT (%) (%)

1,1 DICHLORDETHENE 1.50 30.3 28.9 4.8 ±20BENZENE 1.50 29.6 28.4 4.1 ±20TRICHLOROETHENE 1,50 27.1 25.9 4.4 ±20TOLUENE 1.50 27,7 27.0 2.7 ±20CHLOROBENZENE 1.50 28.9 28.2 2.3 ±20

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA - NOT AVAILABLE OR APPLICABLE

K PRIME, INC.LABORATORY QUALITY CONTROL REPORT

METHOD: DROREFERENCE: EPA 8015B

METHOD BLANK ID: B11I71OS1

REPORTING SAMPLELIMIT CONC

PARAMETER SPIKE SAMPLE SPIKE RECOVERY LIMITSADDED RESULT RESULT (%) (%)

DRO 500 ND 409 82 60-140



DRO 10.0 409 415 1.5 ±20

NOTES:DRO - DIESEL RANGE ORGANICS (C12-C34)ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA - NOT APPLICABLE OR AVAILABLE

BATCH ID:DATE EXTRACTED:

DATE ANALYZED:

1117105111/1 7/201011/17/2010

SAMPLE TYPE: SOILUNITS: mg/Kg

COMPOUND NAME

IDRO I lOAD ND

SAMPLE ID: L1I171OS1DUPLICATE ID: 1311171051


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DEC - 7 Zti1’

K PRIME, Inc.CONSULTING AN. CHEMISTS 3621 Westwind Blvd.


TRANSMITTAL

DATE: 11/24/2010

TO: MR. DAVID NOREN ACCT: 9986EBA ENGINEERING PROJ: 10-1645825 SONOMA AVENUE


Phone: 707-544-0784Fax: 707-544-0866

Email: dataebal8ebagroup.corn

dnoren@ebagroup . cam

FROM: ; ;::SUBJECT: LA30RATOY RES’JLTS FOR YOJR PROJECT 10-645

Erc’osed p’ease md K ?nie’s labora:oy repcr:s fo the fo’lowirg samples:

SAMPLE ID TYPE DATE TIME KPI LAB #53-1-W WATER 11/16/10 t2:25 86940SB-2-W WATER 11/16/10 12:00 869415B-3-W WATER 11/16/10 16:30 86942SB-4-W WATER 11/16/10 17:00 86943SB-S-N WATER 11/16/10 16:45 86944

The aDave l’sie-d satple group was received or 11/17/19 ad :estec as requestedon the chain of custody cocume’t.

7-lease call ne if yc nave any qesticrs or need furtner nfornia:cn.Thank you far this o3pcrtnity to Dc of serVce.



NOTES:

LAB NO:SAMPLE TYPE:

DATE SAMPLED:TIME SAMPLED:

86940WATER11/161201012:25

BATCH#: 111710W1

LIMITSAMPLE

CONG



APPROVED BY:

__________

DATE:

___________

SAMPLE ID: SB-1-W


METHOD: VOLATILE ORGANIC COMPOUNDSREFERENCE: EPA 5030/8260

COMPOUND NAME GAS NO. REPORTING

DATE ANALYZED: 11/18/2010UNITS: ug/L

BENZENE 71 -43-2 5.00 NDTOLUENE 108-88-3 5.00 NDETHYLBENZENE 100-41-4 5.00 NDXYLENE (M+P) 1330-20-7 5.00 NDXYLENE (0) 1330-20-7 5.00 5.72

K PRIME, INC. SAMPLE ID: SB-2-W

LABORATORY REPORT LAB NO: 86941SAMPLE TYPE: WATER

K PRIME PROJECT: 9986 DATE SAMPLED: 11116/2010

CLIENT PROJECT: 10-1645 TIME SAMPLED: 12:00

BATCH#: 111710W1

METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010

REFERENCE: EPA 5030/8260 UNITS: ug/L


BENZENE 71-43-2 0.500 NDTOLUENE 108-88-3 0.500 ND

ETHYLBENZENE 100-41-4 0.500 NDXYLENE (M+P) 1330-20-7 0.500 NDXYLENE (0) 1330-20-7 0.500 ND




APPROVED BY:

_____________

DATE:

___________



K PRIME PROJECT: 9986 DATE SAMPLED: 11/1 6/2010

CLIENT PROJECT: 10-1645 TIME SAMPLED: 16:30

BATCH#: 111710W1

METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/17/2010

REFERENCE: EPA 503018260 UNITS: ug/L

COMPOUND NAME CAS NO. REPORTING SAMPLE

_______ ____

LIMIT CONC

BENZENE 71-43-2 0.500 ND

TOLUENE 108-88-3 0.500 ND

ETHYLBENZENE 100-41-4 0.500 ND

XYLENE çM÷P) 1330-20-7 0.500 NDXYLENE (0) 1330-20-7 0.500 ND




APPROVED BY:

__________

DATE: I

K PRIME, INC. SAMPLE ID: SB-4-WLABORATORY REPORT LAB NO: 86943

SAMPLE TYPE: WATER

K PRIME PROJECT: 9986 DATE SAMPLED: l1/1812010CLIENT PROJECT: 10-1645 TIME SAMPLED: 17:00

BATCH#: 111710W1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/17/2010REFERENCE: EPA 503018260 UNITS: ug)L


BENZENE 71-43-2 0.500 ND

ITOLUENE 108-88-3 0.500 NDJETHYLBENZENE 100-41-4 0.500 ND[XYLENE (M+P) 1330-20-7 0.500 ND

IXYLENE (0) 1330-20-7 0.500 ND

SURROGATE RECOVERY %DIBROMOFLUOROMEIHANE 104TOLUENE-D8 1024-BROMOFLUOROBENZENE 97



APPROVED BY:

___________

DATE:

__________



K PRIME PROJECT: 9986 DATE SAMPLED: 1111612010CLIENT PROJECT: 10-1645 TIME SAMPLED: 16:45

BATCH#: 111710W1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/18/2010



BENZENE 71 -43-2 0500 ND

TOLUENE 108-88-3 0.500 NDETHYLBENZENE 100-41-4 0.500 NDXYLENE (M+P) 1330-20-7 0.500 NDXYLENE (0) 1330-20-7 0.500 ND




APPROVED BY: (J!Jt) /

DATE: f//,Q-3/9c,o/ /



METHOD: DRO SAMPLE TYPE: WATERREFERENCE: EPA 8015B UNITS: mg/L

SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE DRO

SAMPLED ID DATE ANALYZED CONC PATTERN

SB-1-W 86940 11/16/10 112210W01 11/22/10 11/23/10 0.050 652SB-2-W 86941 11/16/10 112210W01 11/22/10 11/23/10 0.050 3.39S8-3-W 86942 11/16/10 112210W01 11/22/10 11/23/10 0.050 NDSB-4-W 86943 11/16/10 112210W01 11/22/10 11/23/10 0.050 NDSB-5-W 86944 11/16/10 112210W01 11/22/10 11/23/10 0.050 ND

NOTES:DRO Diesel Range Organics (C12-C34) with Silica Gel Cleanup

ND Not Detected at or above the stated MRLNA Not Applicable or Available

MRL Method Reporting LimitAD Typical pattern for dieselAM Hydrocarbon response is in the CI2-C22 rangeAC Heavier hydrocarbons contributing to diesel range quantitationAJ Heavier hydrocarbon than dieselAK Lighter hydrocarbon than dieselAE Unknown hydrocarbon with a single peakAN Unknown hydrocarbon with several peaks

APPROVED BY:

________________

DATE:

________________

PAGE 1 OF I

K PRIME, INC.LABORATORY METHOD BLANK REPORT METHOD BLANK ID: B111710W1

SAMPLE TYPE: WATER

BATCH#: 111710W1METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/17/2010REFERENCE: EPA 503018260 UNITS: ug/L

COMPOUND NAME CAS NO. REPORTING SAMPLELIMIT CONG

BENZENE 71-43-2 0.500 NDTOLUENE 108-88-3 0.500 NDETHYLBENZENE 100-41-4 0500 NDXYLENE (M+P) 1330-20-7 0.500 ND

XYLENE (0) 1330-20-7 0.500 ND



NA -NOT APPLICABLE OP AVAILABLE

K PRIME, INC. SAMPLE ID: B11I71OW1

LABORATORYQC REPORT SPIKE ID: L11171OW1DUPLICATE ID: D11171OW1

METHOD: VOLATILE ORGANIC COMPOUNDS BATCH #: 111 710W1

REFERENCE: EPA 5030/8260 SAMPLE TYPE: WATERUNITS: pg/L


PARAMETER SPIKE SAMPLE SPIKE RECOVEm LIMITSADDED RESULT RESULT (%) (%)


BENZENE 10.0 ND 9.54 95 60-140

TRICHLOROETHENE 10.0 ND 6.97 90 60-140

TOLUENE 10.0 ND 9.13 91 60-140

CHLOROBENZENE 10.0 ND 9.23 92 60-140

PRECISiON (SPIKE DUPLICATE)


1,1 DICHLOROETHENE 0.500 10.0 10.1 0.4 ±20BENZENE 0.500 9.54 9.40 1.5 ±20TRICHLOROETHENE 0.500 8.97 8.72 28 ±20TOLUENE 0.500 9.13 9.06 0.8 ±20

CHLOROBENZENE 0.500 9.23 9.36 1.4 ±20




DRO 2.50 ND 2.08 83 60-140


COMPOUND NAME REPORTING SPIKE DUPLICATE RPD LIMITSLIMIT RESULT RESULT (V.) (°h)

DRO 0.050 2.08 1.82 13 L ±20




DATE ANALYZED:

112210W0111/22/201011/23/2010

COMPOUND NAME

SAMPLE TYPE: WATERUNITS: mg/L

METHOD BLANK ID: B112210W01


IDRO I 0.050 ND

SAMPLE ID: L112210W01DUPLICATE ID: D112210W01


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1FC’fl DEC 1 3 2010K PRIME, Inc.

CONSULTING ANALYTICAL CHEMISTS 3621 Westwind Blvd.Santa Rosa CA 95403Phone: 707 527 7574FAX: 707 527 7879

IRAN SM IT[A I

DATE: 11/16/2010

TO: MR. DAVD NOREN ACCI: 9986EBA ENGINEERING PROJ: 10-1639

825 SGi\lA AVEVJE

SMTA ROSA. CA 95404

Phore: 707-544-3784

Fax: 737-544-0866

Email [email protected]

dnoren@ebagroup . corn

FROM: Richard A. Kagel. Ph.D.

Laboratory Di rector [‘

SUBJECT: LABORATORY RESULTS FOR YOUR PROJECT 10-1639

Enclosed please find K Prime’s laboratory reports for the following samples:

SAMPLE ID TYPE DATE TIME KPI LAB #SB-1-W WATER 11/01/10 12:52 86622SB-2@9’ SOIL 11/01/10 10:35 86623SB-2-W WATER 11/01/10 14:50 86624SB-3@16’ SOIL 11/01/10 12:50 86625SB-3-W WATER 11/01/10 15:10 86626SB-415 SOIL il/0P23 13:43 36527S3-4-W .TER i:ic:,:o :4:28 86528

SOIL 11/01/10 :5:00 .56529SB-5-W WrER 11/0J10 16:10 86530

SB-6@10 SOIL :1/01/13 15:45 86631

The aoove listed sample group was received on 1:/C2/10 aid tested as eqestedon the chain of cus:ody cocumert.

lease call roe i you have &y qestcrs or reed frtne i’oraton.

Therk you for th:s cppoturity to be of service,


K PRIME PROJECT: 9986CLIENT PROJECT: 1D-1639

METHOD: GRO-GASOLINE RANGE ORGANICS SAMPLE TYPE: WATERREFERENCE: EPA 8015B UNITS: mg/L

SAMPLE ID LAB NO. DATE TIME BATCH DATE MRL SAMPLE GROSAMPLED SAMPLED ID ANALYZED CONC PATTERN

SB-1-W 86622 11/1/2010 12:52 110210W1 11/212010 0.050 ND

________

SB-2-W 86624 11/1/2010 14:50 110210W1 11/2)2010 0.050 ND

________

SB-3-W 86626 11/1/2010 15:10 110210W1 11/2/2010 0.050 ND

________

SB-4-W 86628 11/1/2010 14:28 110210W1 11/2)2010 0.050 ND

________

SB-5-W 86630 11/1/2010 16:10 110210W1 11/2/2010 0.050 ND

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED METHOD REPORTING LIMITNA - NOT APPLICABLE OR AVAILABLEMRL - METHOD REPORTING LIMITAE - UNKNOWN HYDROCARBON WITH A SINGLE PEAKAN - UNKNOWN HYDROCARBON WITH SEVERAL PEAKSAS - HEAVIER HYDROCARBON THAN GASOLINE CONTRIBUTING TO GRO VALUECO - HYDROCARBON RESPONSE IN GASOLINE RANGE BUT DOES NOT RESEMBLE GASOLINE

APPROVED BY: ‘dflk)DATE:

______

PAGE 1 OF I



METHOD: GRO-GASOLINE RANGE ORGANICS SAMPLE TYPE: SOILREFERENCE: EPA 8015B UNITS: mg/Kg

SAMPLE ID LAB NO. DATE TIME BATCH DATE MRL SAMPLE GROSAMPLED SAMPLED ID ANALYZED CONC PATTERN

SB-2@9 86623 11/1/2010 10:35 110210S1 11/2/2010 1.00 NDSB3f16 86625 11/1/2010 12:50 11021051 11/2/2010 1.00 NDSB-4@16 86627 11/1/2010 13:40 11021051 11/2/2010 1.00 NDSB-5@16 86629 11/1/2010 15:00 11021051 11/2/2010 1.00 ND

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED METHOD REPORTING LIMITNA - NOT APPLICABLE OR AVAILABLEMRL - METHOD REPORTING LIMITAE - UNKNOWN HYDROCARBON WITH A SINGLE PEAKAN UNKNOWN HYDROCARBON WITH SEVERAL PEAKSAS - HEAVIER HYDROCARBON THAN GASOLINE CONTRIBUTING TO GRO VALUECO - HYDROCARBON RESPONSE IN GASOLINE RANGE BUT DOES NOT RESEMBLE GASOLINE

APPROVED BY: u’VA’JDATE: I/tcI!2rHn

PAGE 1 OF I

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METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 503518260 UNITS: pg/Kg


4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND1,2,4-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1,3-DICHLOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1,4-DICHLOROSENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1,2-DICHLOROBENZENE 95-50-1 1.50 ND12-DIBROMO-3-CHLOROPROPANE 96-12-8 1.50 ND1 ,2,4-TRICHLOROBENZENE 120-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 ND1,2,3-TRICHLOROBENZENE 87-61-6 3.00 ND

SURROGATE RECOVERYDIBROMOFLUOROMETHANE 97TOLUENE-D8 1024-BROMOFLUOROBENZENE 95

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METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 5035/8260 UNITS: pg/Kg

COMPOUND NAME GAS NO. REPORTING SAMPLELIMIT CONG

4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND1,2.4-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1,3-DICI-ILOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1,4-DICHLOROBENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1,2-DICHLOROBENZENE 95-50-1 1.50 ND1,2-DIBROMO-3-CHLOROPROPANE 96-12-8 1.50 ND1 ,24-TRICHLOROBENZENE 1 20-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 NDI2,3-TRICHLOROBENZENE 87-61-6 3.00 ND


NOTESND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMIT

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KPRIME PROJECT: 9986 BATCH#: 11111OS1CLIENT PROJECT: 10-1639 DATE ANALYZED: 11/9/2010



4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND12,4-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1,3-DICHLDROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1 ,4-DICHLOROBENZENE 10646-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1 ,2-DICHLOROBENZENE 95-50-1 1.50 ND12-DIBROMO-3-CHLOROPROPANE 96-12-8 150 ND1 24-TRICHLOROBENZENE 1 20-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91 -20-3 3.00 NDl,23-TRICHLOROBENZENE 87-61-6 3.00 ND

SURROGATE RECOVERYDIBROMOFLUOROMETHANE 95TOLUENE-D8 1024-BRDMOFLUOROBENZENE 95


NA-NOT APPLICABLE OR AVAILABLE

APPROVED BY:DATE:

NOTES:

PAGE 2 OF 2

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K PRIME PROJECT: 9936 BATCH#: 111110S1CLIENT PROJECT: 10-1639 DATE ANALYZED: 11/9/2010



4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 150 ND124-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1 ,3-DICI-ILOROBENZENE 541-73-1 1 .50 ND4-ISOPROPYLTOLUENE 99-87-6 1 .50 ND1,4-DICHLOROBENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1,2-DICHLOROBENZENE 95-50-1 1.50 ND1,2-DIBROMO-3-CHLORQPROPANE 96-12-8 1.50 NDI ,2,4-TRICHLOROBENZENE 120-82-1 3.00 NDHEXACHLOROBUTADENE 87-68-3 3.00 NDNAPHTHALENE 91 -20-3 3.00 ND1,2,3-TRICHLOROBENZENE 87-61-S 3.00 ND

SURROGATE RECOVERY %DIBROMOFLUOROMETHANE 98TOLUENE-08 1004-BROMOFLUOROBENZENE 94



APPROVED BY: (/JL)DATE: ////5/4fl/o

NOTES:

PAGE 2 OF 2



BATCH#: 11111051METHOD: VOLATILE ORGANIC COMPOUNDS DATE ANALYZED: 11/9/2010REFERENCE: EPA 5035/8260 UNITS: pg/Kg

COMPOUND NAME CAS NO. REPORTING SAMPLELIMIT CONG

BENZENE 71-43-2 1.50 NDTOLUENE 108-88-3 1.50 NDETHYLBENZENE 100-41-4 1.50 NDXYLENE (M+P) 1330-20-7 1.50 NDXYLENE (0) 1330-20-7 1.50 ND

SURROGATE RECOVERYjpOMOFLUOROMETHANETO LU EN E-D84-BROMOFLUOROBENZENE

NOTES:

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10197 I

ND - NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA -NOT APPLICABLE OR AVAILABLE

APPROVED BY:DATE: ii / i 5/0-tv 0

PAGE 1 OF 1




SAMPLE TYPE: WATERUNITS: mg/L

SAMPLE ID LAB NO. DATESAMPLED

BATCH EXTRACT DATEID DATE ANALYZED

MRL SAMPLE DROCONC PATTERN

Diesel Range Organics (C12-C23) with Silica Gel CleanupNot Detected at or above the stated MRLNot Applicable or AvailableMethod Reporting LimitTypical Pattern for DieselHydrocarbon response is in The C12-C22 rangeHeavier hydrocarbons contributing to diesel range quantitationHeavier hydrocarbon than dieselLighter hydrocarbon than dieselUnknown hydrocarbon with a single peakUnknown hydrocarbon with several peaks

APPROVED BY: LiC.4%JDATE: /oa(oIo

SB-l-W 86622 11/01/10 1028’OWO1 11/03/10 11/03/10 0.050 NDSB-2-W 86624 11/01/10 102810W01 11/03/10 11/03/10 0.050 NDSB-3-W 86626 11/01/10 102810W01 11/03/10 11/03/10 0.050 NDSB-4-W 86628 11/01/10 102810W01 11/03/10 11/03/10 0.050 NDSB-5-W 86630 11/01/10 102810W01 11/03/10 11/03/10 0.050 ND

NOTES:DRO

NDNA

MRLADAMACAJAKAEAN



METHOD: HRO SAMPLE TYPE: WATERREFERENCE: EPA 8015B UNITS: mg/L

SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE HROSAMPLED ID DATE ANALYZED CONC PATTERN

SB-1-W 86622 11/01/10 102810W01 11/03/10 11/03/10 0.050 NDS8-2-W 86624 11/01/10 102810W0I 11/03110 11/03/10 0.050 NDSB-3-W 86626 11/01/10 102810W01 11103/10 11/03110 0.050 NDSB-4-W 86628 11/01/10 102810W01 11/03/10 11/03/10 0.050 NDSB-5-W 86630 11/01/10 102810W01 11/03/10 11/03/10 0.050 ND

NOTES:HRO Heavy Range Organics (C24-C34) with Silica Gel Cleanup


MRL Method Reporting LimitAE Unknown hydrocarbon with a single peakAN Unknown hydrocarbon with several peaks

APPROVED BY: L’C-14.JDATE:




SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE DROSAMPLED ID DATE ANALYZED CONC PATTERN

SB-2@9 86623 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND

_____

SB-3@16 86625 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND

_____

SB-4@16 86627 11/01/10 110210S1 11/2/2010 11/02/10 10.0 ND

_____

SB-5@16’ 86629 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND

_____

SB-6@10 86631 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND



MRL Method Reporting LimitAD Typical Pattern for DieselAM Hydrocarbon response is in the C12-C22 rangeAC Heavier hydrocarbons contributing to diesel range quarititationAJ Heavier hydrocarbon than dieselAK Lighter hydrocarbon than dieselAE Unknown hydrocarbon with a single peakAN Unknown hydrocarbon with several peaks

APPROVED BY: L-114 iDATE: tk/oa/tin



METHOD: HRO SAMPLE TYPE: SOIL

REFERENCE: EPA 8015B UNITS: mg/Kg

SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE HROSAMPLED ID DATE ANALYZED CONG PATTERN

SB-2@9 86623 11/01/10 110210S1 11/212010 11/02/10 10.0 ND

_____

SB-3@16’ 86625 11/01/10 110210S1 11/2/2010 11/02)10 10.0 ND

_____

SB4@16’ 86627 11101/10 110210S1 11/2/2010 11/02110 10.0 ND

_____

SB-5@16 66629 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND

_____

SB-6@10 66631 11/01/10 11021031 11/2/2010 11/02/10 10.0 ND




APPROVED BY: iXkjDATE: \/O3/2.-cIo


DATE SAMPLED: 11/01/10K PRIME PROJECT: 9986 TIME SAMPLED: 15:45CLIENT PROJECT: 10-1639 BATCH #: 110810501

DATE EXTRACTED: 11/8/2010DATE ANALYZED: 11/16/2010

METHOD: POLYCHLORINATED BIPHENYLS SAMPLE TYPE: SOILREFERENCE: EPA 3550/8082 UNITS: ug/Kg

COMPOUND NAME GAS NO. REPORTING SAMPLELIMIT CONG

AROCLOR 1016 12674-11-2 100 NDAROCLOR 1221 11104-28-2 100 NDAROCLOR 1232 11141-16-5 100 NDAROCLOR 1242 53469-21-9 100 NDAROCLOR 1248 12672-29-6 100 NDAROCLOR 1254 11097-69-I 100 NDAROCLOR 1260 11096-62-5 100 ND

SURROGATE RECOVERY %TCMX 104DCBP 60


APPROVED BY:

_________

DATE:LZ

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DATE SAMPLED: 11/01/10K PRIME PROJECT: 9986 TIME SAMPLED: 12:52CLIENT PROJECT: 10-1639 BATCH ID: 101104W01

METHOD: TOTAL METALS BY ICP/MS SAMPLE TYPE: WATERREFERENCE: EPA 200.8 UNITS: ug/L

ELEMENT DATE REPORTING SAMPLENAME ANALYZED LIMIT CONC

CADMIUM Cd 11/08/10 1.00 NDCHROMIUM Cr 11/08/10 1.00 7.79LEAD Pb 11/08/10 1.00 1.96NICKEL Ni 11/08/10 1.00 52.1ZINC Zn 11/08/10 1.00 16.2


APPROVED BY: LPJ%JDATE: fopj/gjo



METHOD: TOTAL METALS BY ICP/MS SAMPLE TYPE: WATERREFERENCE: EPA 200.8 UNITS: ug/L




APPROVED BY: cA’Lk.DATE: k\/oS1p-cIo



METHOD: TOTAL METALS BY ICP!MS SAMPLE TYPE: WATERREFERENCE: EPA 200.8 UNITS: ug/L




APPROVED BY:

___________

DATE: L\/Db/CIC

K PRIME, INC. SAMPLE ID: SB-4-WLA8ORATORY REPORT LAB NO: 86628

DATE SAMPLED: 11/01/10K PRIME PROJECT: 9986 TIME SAMPLED: 14:28CLIENT PROJECT: 10-1639 BATCH ID: 101 104W01

METHOD: TOTAL METALS BY ICPIMS SAMPLE TYPE: WATERREFERENCE: EPA 200.8 UNITS: uglL


CADMIUM Cd 11108110 1.00 NDCHROMIUM Cr 11/08/10 100 10.8LEAD Pb 11)08110 1.00 NDNICKEL Ni 11/08/10 1.00 79.5ZINC Zn 11/08/10 1.00 16.1


APPROVED BY: 41JjDATE: U/cab-olD







APPROVED BY: i/InDATE: Ii/o/oic


DATE SAMPLED: 11/01/10K PRIME PROJECT: 9986 TIME SAMPLED: 10:35CLIENT PROJECT: 10-1639 BATCH ID: 101026501

METHOD: TOTAL METALS BY ICPIMS SAMPLE TYPE: SOILREFERENCE: EPA 3050B16020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 250 NDCHROMIUM Cr 11/04/10 2.50 214LEAD Pb 11/04/10 2.50 3.01NICKEL Ni 11/04/10 2.50 90.9ZINC Zn 11/04/10 250 30.3


APPROVED BY: t,4’±iDATE: 1j/Op-,/g_oio

K PRIME, INC. SAMPLE ID: SB3@16

LABORATORY REPORT LAB NO: 86625DATE SAMPLED: 11/01/10

K PRIME PROJECT: 9986 TIME SAMPLED: 12:50CLIENT PROJECT: 10-1639 BATCH ID: 101026501

METHOD: TOTAL METALS BY ICP!MS SAMPLE TYPE: SOILREFERENCE: EPA 3050B16020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 250 NDCHROMIUM Cr 11/04/10 250 49.2LEAD Pb 11/04/10 2.50 4.99NICKEL Ni 11/04/10 2.50 72.3ZINC Zn 11/04/10 2.50 29.2


APPROVED BY: tLk)DATE:

___________



METHOD: TOTAL METALS BY ICP1MS SAMPLE TYPE: SOILREFERENCE: EPA 3050B/6020A UNITS: mg/Kg


CADMIUM Cci 11/04/10 2.50 NDCHROMIUM Cr 11/04/10 2.50 24.8LEAD Pb 11/04/10 2.50 3.59NICKEL Ni 11/04/10 2.50 18.2ZINC Zn 11/04/10 2.50 14.4


APPROVED BY: uêJjDATE: \/O8/&z.ceo


DATE SAMPLED: 11/01/10K PRIME PROJECT: 9986 TIME SAMPLED: 15:00CLIENT PROJECT: 10-1639 BATCH ID: 101026S01

METHOD: TOTAL METALS BY ICPIMS SAMPLE TYPE: SOILREFERENCE: EPA 3050B!6020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 250 NDCHROMIUM Cr 11/04/10 2.50 30.4LEAD Pb 11/04/10 2.50 5.34NICKEL Ni 11/04/10 2.50 44.7ZINC Zn 11/04/10 2.50 19.2


APPROVED BY: cyfiJDATE: \/oEs/9-oio



METHOD: TOTAL METALS BY ICP/MS SAMPLE TYPE: SOILREFERENCE: EPA 3050B16020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 2.50 NDCHROMIUM Cr 11/04/10 2.50 32.2LEAD Pb 11/04/10 250 7.17NICKEL Ni 11/04/10 250 55.8ZINC Zn 11/04/10 250 30.2


APPROVED BY: vJ’kDATE: h/081201o


BATCH It:DATE EXTRACTED:

DATE ANALYZED:

1 10210W111/2/201011/2/2010

UNITS: mg/L

SAMPLECONC

ITPH-G I 0.050 I ND

SAMPLE ID: L1IO2IOW1DUPLICATE ID: D11O2IOW1

BATCH#: 110210W1SAMPLE TYPE: WATER

UNITS: mg/L




TPH-G 0.250 ND 0.272 109 60-140



TPH-G 0.050 0.272 0.242 11.7 ±20


METHOD BLANK ID:SAMPLE TYPE:

METHOD: GRO-GASOLINE RANGE ORGANICSREFERENCE: EPA 8015B

COMPOUND NAME

Bi 10210W1WATER

REPORTINGLIMIT

NA - NOT APPLICABLE

K PRIME, INC. METHOD BLANKID: 811021051

LABORATORY QC REPORT SAMPLE TYPE: SOIL

METHOD: GRO-GASOLINE RANGE ORGANICSREFERENCE: EPA 8015B BATCI-f#: 11021051


UNITS: mg/kg

COMPOUND NAME REPORTING SAMPLELIMIT CONC

ITPH-G I too ND


SAMPLE ID: Li 1021051DUPLICATE ID: D11021051

BATCH#: 11021051SAMPLE TYPE: SOIL

UNITS: mg/kg




TPH-G 5.00 ND 4.70 94 60-140


COMPOUND NAME REPORTING SPIkE DUPLICATE RPD LIMITSLIMIT RESULT RESULT (%) (%)

TPH-G 1.00 4.70 4.46 5.1 ±20


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K PRIME, INC.LABORATORY METHOD BLANK REPORT METHOD BLANK ID: B11IO1OW1

BATCH#: 111O1OW1DATE ANALYZED: 11/10/2010

METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: WATER



4-CHLOROTOLUENE 106-43-4 0.500 ND

TERT-BUTh’LBENZENE 98-06-6 0.500 ND

1 ,2.4—TRIMETHYLBENZENE 95-63-6 0.500 ND

SEC-BUTYLBENZENE 135-98-8 0.500 ND

1,3-DICHLOROBENZENE 541-73-1 0.500 ND

4-ISOPROPYLTOLUENE 99-87-6 0.500 ND

1,4-DICHLOROBENZENE 106-46-7 0.500 ND

N-BUTYLBENZENE 104-51-8 0.500 ND

12-DICHLOROBENZENE 95-50-1 0.500 ND

1,2-DIBROMO-3-CHLOROPROPANE 96-12-8 0.500 ND

1,2.4-TRICHLOROBENZENE 120-82-1 1.00 ND

HEXACHLOROBUTADIENE 87-68-3 1.00 ND

NAPHThALENE 91-20-3 100 ND

1,23-TRICHLOROBENZENE 87-61-6 1.00 ND




PAGE 2 OF 2

K PRIME, INC. SAMPLE ID: B111O10W1

LABORATORY QC REPORT SPIKE ID: Li 1 1O1OWIDUPLICATE ID: D111O1OWI

METHOD: VOLATILE ORGANIC COMPOUNDS BATCH #: 111O1OW1

REFERENCE: EPA 5030/8260 SAMPLE TYPE: WATERUNITS: pg/L


PARAMETER SPIKE SAMPLE SPIKE RECOVERS LIMITS

ADDED RESULT RESULT (%) (%)1,1 DICHLOROETHENE 10.0 ND 8.61 86 60-140

BENZENE 10.0 ND 9.08 91 60-140

TRICHLOROETHENE 10.0 ND 831 83 60-140

TOLUENE 10.0 ND 9.10 91 60-140



COMPOUND NAME REPORTING SPIKE DUPLICATE RPD UMITSLIMIT RESULT RESULT (%) (%)

1,1 DICI-ILOROETHENE 0.500 8.61 8.96 4.0 ±20

BENZENE 0500 9.08 9.40 3.5 ±20

TRICHLOROETHENE 0.500 8.31 8.71 4.7 ±20

TOLUENE 0.500 9.10 9.72 6.6 ±20

CHLOROBENZENE 0.500 9.23 9.54 3.3 ±20

NOTES:ND- NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMIT

NA- NOT AVAILABLE OR APPLICABLE

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K PRIME, INC.LABORATORY METHOD BLANK REPORT METHOD BLANK ID: B11I11OS1


METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 5035/8260 UNITS: iig/Kg


4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND1 2,4-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-S 1.50 ND1,3-DICHLOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1,4-DICHLOROBENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 NDI2-DICHLOROBENZENE 95-50-1 1.50 ND12-DIBROMO-3-CHLOROPROPANE 96-12-8 1.50 ND1 24-TRICHLOROSENZENE 120-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 ND1,2,3-TRICHLOROBENZENE 87-61-6 3.00 ND

SURROGATE RECOVERYDIBROMOFLUDROMETHANE 96TOLUENE-D8 984-BROMOFLUDROBENZENE 97

NOTES:ND - NOT DETECTED AT DR ABOVE THE STATED REPORTING LIMIT


PAGE 2 OF 2

K PRIME, INC. SAMPLE ID: 811111051

LABORATORY QC REPORT SPIKE ID: L11111OS1DUPLICATE ID: Dliii 1051

METHOD: VOLATILE ORGANIC COMPOUNDS BATCH #: 11111 OS1



PARAMETER SPIKE SAMPLE SPIKE RECOVERN LIMITS

ADDED RESULT RESULT (%) (%)


BENZENE 3ft0 ND 29.6 99 60-140

TRICHLOROETHENE 30.0 ND 27.5 92 60-140

TOLUENE 30,0 ND 31.1 104 60-140




1,1 DICHLOROETHENE 1.50 27.9 27.3 2.1 ±20

BENZENE 1.50 29.6 29.0 2.3 ±20


TOLUENE 1.50 31.1 30.0 3.5 ±20

CHLOROBENZENE 150 30.4 29.6 2.5 ±20


NA - NOT AVAILABLE OR APPLICABLE



SAMPLE TYPE: WATERUNITS: mgJL

METHOD BLANK ID: B102810W01


IDRO 0.050 ND

SAMPLE ID: L102810W01DUPLICATE ID: D102810W01


PARAMETER SPIKE SAMPLE SPIKE RECOVERY UMITS

ADDED RESULT RESULT (%) (%)

DRO 2.50 ND 2.21 88 60-140


IëoMPOUND NAME REPORTING SPIKE DUPLICATE RPD LIMITS

LIMIT RESULT RESULT (%) (%)

DRO 0.050 2.21 2.38 7.4 ±20


BATCH ID:

DATE EXTRACTED:DATE ANALYZED:

102810W0110/28/201010/28/2010

BATCH ID: 1102105111/2/201011/212010


IDRO 10.0 I ND

SAMPLE ID: L110210S1DUPLICATE ID: D11O21OS1



DRO 500 ND 472 94 60-140


COMPOUND NAME REPORTING SPIKE DUPLICATE RPO LIMITSLIMIT RESULT RESULT (%) (%)

DRO 10.0 472 482 2.1 ±20

K PRIME, INC.LABORATORY QUALITY CONTROL REPORT DATE EXTRACTED:

DATE ANALYZED:

METHOD: DRO SAMPLE TYPE: SOILREFERENCE: EPA BDI5B UNITS: mg/Kg

METHOD BLANK ID: 811021051


K PRIME, INC.LABORATORY OC REPORT

METHOD: POLYCHLORINATED BIPHENYLSREFERENCE: EPA 3550/8082

COMPOUND NAME CAS NO.

METHOD BLANK ID: B11081001

BATCH#: 110810801DATE EXTRACTED: 11/8/2010

DATE ANALYZED: 11)16/2010

SAMPLE TYPE: SOILUNITS: ug/Kg


SURROGATE RECOVERY %TCMX 86

DCSP 76

NOTES:ND - NOT DETECTED ABOVE THE STATED REPORTING LIMIT


AROCLOR 1016 12674-11-2 100 ND

AROCLOR 1221 11104-28-2 100 ND

AROCLOR 1232 11141-16-5 100 ND

AROCLOR 1242 53469-21-9 100 ND

AROCLOR 1248 12672-29-6 100 ND

AROCLOR 1254 11097-69-1 100 ND

AROCLOR 1260 11096-82-5 100 ND

Page 1 of 2

K PRIME, INC. SAMPLE ID: L11081001

LABORATORY 00 REPORT DUPLICATE ID: 011081001BATCH#: 110810S01

DATE EXTRACTED: 1118/2010DATE ANALYZED: 11/16/2010

METHOD: POLYCHLORINATED BIPHENYLS SAMPLE TYPE: SOIL

REFERENCE: EPA 3550/8082 UNITS: uglKg


PARAMETER SPIKE SAMPLE J SPIKE RECOVERY LIMITS

ADDED RESULT RESULT (%) {%)AROCLOR 1260 5000 ND 5368 107 60-140


COMPOUND NAME REPORTING SPIKE DUPLICATE RPD LIMITS

LIMIT RESULT RESULT (%) (%)AROCLOR 1260 100 5370 5339 0.6 ±20

NOTES:



Page 2 of 2

K PRIME, INC. SAMPLE ID: L110410-W

LABORATORY BATCH QC REPORT DUPLICATE ID: D110410-WMETHOD BLANK ID: B110410-W

BATCH#: 101104W01DATE ANALYZED: 11/08/2010


ELEMENT MB SA SR SP SPD SP RPDug/L ug/L ug/L ug/L ug/L %R %

CADMIUM Cd <1.00 200 0.0 192 192 96 0.1

CHROMIUM Cr <1.00 200 0.0 215 214 108 0.6LEAD Pb <1.00 200 0.0 205 204 103 0.6NICKEL Ni <1.00 200 0.0 204 203 102 0.5ZINC Zn <1.00 200 0.0 190 189 95 0.5

NOTES:ND: NOT DETECTEDMB: METHOD BLANK

SA: SPIKE ADDEDSR: SAMPLE RESULTSP: SPIKE RESULT

SPD: SPIKE DUPLICATE RESULTSPrR): SPIKE % RECOVERYRPD: RELATIVE PERCENT DIFFERENCE

K PRIME, INC. SAMPLE ID: L102610-S

LABORATORY BATCH QC REPORT DUPLICATE ID: D102610-S

METHOD BLANK ID: 8102610-S

BATCH#: 101026501

DATE ANALYZED: 10/27/10

METHOD: TOTAL METALS BY ICPIMS SAMPLE TYPE: SOLID

REFERENCE: EPA 3050B16020A UNITS: mg/Kg

ELEMENT MB SA SR SP SPD SP RPD

mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg %R %

CADMIUM Cd <2.50 100 0.0 97 98 97 0.2

CHROMIUM Cr <2.50 100 00 99 100 99 0.9LEAD Pb <2.50 100 0.0 107 109 107 1.7NICKEL Ni <2.50 100 0.0 98 98 98 0.2ZINC Zn <2.50 100 00 93 94 93 0.6

NOTES:ND: NOT DETECTED

MB: METHOD BLANKSA: SPIKE ADDED

SR: SAMPLE RESULTSP: SPIKE RESULT5PD: SPIKE DUPLICATE RESULT

SP(%R): SPIKE % RECOVERYRPD: RELATIVE PERCENT DIFFERENCE

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K PRIME, Inc.CONSULTING ANALYTICAL CHEMISTS 3621 Westwind Blvd.


TRANSMITTAL

DATE: 11/16/2010

TO: MR. DAVID NOREN ACCT: 9986

EBA ENGINEERING PROJ: 10-1639

825 SONOMA AVENUE


Phone: 707-544-0784Fax: 707-544-0866

Email: [email protected]@eDagrouD. c07

FROM: Ricnarc A. Kagel. Ph.D.Laboratory 3iector L

SUBJECT: LABOTORv RESULTS FOR YOJR PROJECT 10-1639

Enclosed Dease find K Pr’is aratory reDorts for the toliowng samples:

SAMPLE ID TYPE DATE TIME KPI LAB #Ft41@SuR:ACE SOIL 11/01/10 11:31 86618

SOIL 11/01/10 11:29 86619

hA-2@SuRFACE SOIL 11/01/10 11:18 86620

FA-2@18”-24 SOIL 11/01/10 12:08 86621

The above listed sample group was received on 11/02/10 and tested as requested

on the chain of custody document.

Please call ne if you have any questions or reed further information.

Thank you for this opportunity to be of service.



METHOD: GRO-GASOLINE RANGE ORGANICS SAMPLE TYPE: SOILREFERENCE: EPA 8015B UNITS: mg/Kg

SAMPLE ID LAB NO. DATE TIME BATCH DATE MRL SAMPLE GROSAMPLED SAMPLED ID ANALYZED CONe PATTERN

HA-1@SURFACE 86618 11/1/2010 11:31 110210S1 11/2/2010 1.00 ND

_________

HA1@1620 86619 11/1/2010 11:29 11021051 11/2/2010 1.00 ND

_________

HA-2@SURFACE 86620 11/1/2010 11:18 110210S1 11/2/2010 1.00 8.29

_________

HA-2@18-24 86621 11/1/2010 12:08 110210S1 11/2/2010 1.00 ND

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED METHOD REPORTING LIMITNA - NOT APPLICABLE OR AVAILABLEMRL - METHOD REPORTING LIMITAE - UNKNOWN HYDROCARBON WITH A SINGLE PEAKAN - UNKNOWN HYDROCARBON WITH SEVERAL PEAKSAS - HEAVIER HYDROCARBON THAN GASOLINE CONTRIBUTING TO GRO VALUECO - HYDROCARBON RESPONSE IN GASOLINE RANGE BUT DOES NOT RESEMBLE GASOLINE

APPROVED BY:

________________

DATE:

________________

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4-CHLOROTOLUENE 1 06-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND1 24-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTh’LBENZENE 135-98-S 1.50 ND1 3-DICHLOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 NDI4-DICHLOROBENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1 2-DICHLOROBENZENE 95-50-1 1.50 ND1 2-DIBROMO-3-CHLOROPROPANE 96-12-8 1.50 NDI 24-TRICHLOROBENZENE 120-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPI-ITHALENE 91-20-3 3.00 ND123-TRICHLOROBENZENE 87-61-6 3.00 ND




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K PRIME, INC SAMPLE ID: HA-1@16’-20’LABORATORY REPORT LAB NO: 86619


K PRIME PROJECT: 9986 BATCH#: 11111051CLIENT PROJECT: 10-1639 DATE ANALYZED: 11/9/2010


COMPOUND NAME GAS NO. REPORTING SAMPLELIMIT CONC

4-CHLORDTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND12,4-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1 3-DICHLOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1,4-DICHLOROBENZENE 106-46-7 1.50 NDN-OUTYLBENZENE 104-51-8 1.50 ND12-DICHLOROBENZENE 95-50-1 1.50 ND1,2-DIBROMO-3-CHLOROPROPANE 96-12-8 1.50 ND124-TRICHLOROBENZENE 120-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 ND12,3-TRICHLOROBENZENE 87-61-6 3.00 ND


ND - NOT DETECTED AT DR ABOVE THE STATED REPORTING LIMIT


APPROVED BY:DATE: U/l3J2ric

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KPRIME PROJECT: 9986 BATCH#: 111110S1CLIENT PROJECT: 10-1639 DATE ANALYZED: 11/12/2010

METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 503518260 UNITS: iig/Kg


4-CHLOROTOLUENE 106-43-4 7.50 NDTERT-BUTYLBENZENE 98-06-6 7.50 ND124-TRIMETHYLBENZENE 95-63-6 750 431SEC-BUTYLBENZENE 135-98-8 7.50 21.81 3-DICHLOROBENZENE 541-73-1 7.50 ND4-ISOPROPYLTOLUENE 99-87-6 7.50 18.5I4-DICHLOROBENZENE 106-46-7 7.50 NDN-BUTYLBENZENE 104-51-8 7.50 12212-DICHLOROBENZENE 95-50-1 7.50 ND1,2-DIBROMO-3-CHLOROPROPANE 96-12-8 7.50 ND124-TRICHLOROBENZENE 120-82-1 15.0 NDHEXACHLOROBUTADIENE 87-68-3 15.0 NDNAPHTHALENE 91-20-3 15.0 28.51 23-TRICHLOROBENZENE 87-61-6 15.0 ND




APPROVED BY:DATE:

NOTES:

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METHOD: VOLATILE ORGANICREFERENCE: EPA 5035/8260

COMPOUNDS SAMPLE TYPE: SOILUNITS: pg/Kg


4-CHLORDTOLUENE 106-43-4 150 — NDTERT-BUTYLBENZENE 98-06-6 1.50 ND1 24-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND13-DICHLOROBENZENE 541-73-1 1.50 NO4-ISOPROPYLTOLUENE 99-87-6 150 ND1 4-DICHLOROBENZENE 1 06-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND12-DICHLOROBENZENE 95-50-1 1.50 ND1 2-DIBROMO-3-CHLOROPROPANE 96-1 2-8 1.50 ND1 24-TRICHLOROBENZENE 1 20-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 NDI 2,3-TRICHLOROBENZENE 87-61-6 3.00 ND

SURROGATE RECOVERY %DIBROMOFLUOROMETHANE 99TOLUENE-D8 1024-BROMOFLUDROBENZENE 96



APPROVED BY:DATE:

SAMPLE ID: HA2@1824

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PAGE 2 OF 2




SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE DROSAMPLED ID DATE ANALYZED CONG PATTERN

HA-1@SURFACE 86618 11/01/10 11021081 11/2/2010 11/02/10 10.0 575 ACHA-1@16”-20” 86619 11/01/10 11021081 11/2/2010 11/02110 10.0 ND

________

HA-2@SURFACE 86620 11/01/10 11021051 11/3/2010 11/03/10 10.0 11700 ACHA-2@18”-24” 86621 11/01/10 I10210S1 11/2/2010 11/02/10 10.0 ND



MRL Method Reporting LimitAD Typical Pattern for DieselAM Hydrocarbon response is in the C12-C22 rangeAC Heavier hydrocarbons contributing to diesel range quantitationAJ Heavier hydrocarbon than dieselAK Lighter hydrocarbon than dieselAE Unknown hydrocarbon with a single peakAN Unknown hydrocarbon with several peaks

APPROVED BY:

___________

DATE: U/D.5IaCiO



METHOD: HRO SAMPLE TYPE: SOILREFERENCE: EPA 8015B UNITS: mg/Kg

SAMPLE ID LAB NO. DATE BATCH EXTRACT DATE MRL SAMPLE HROSAMPLED ID DATE ANALYZED CONC PATTERN

HA-1@SURFACE 86618 11/01/10 110210S1 11/2/2010 11/02/10 10.0 1030HA-1@16’-20” 86619 11/01/10 11021051 11/2/2010 11/02/10 10.0 ND

HA-2@SURFACE 86620 11/01/10 110210S1 11/3/2010 11/03/10 10.0 17900HA2@1824 86621 11/01/10 110210S1 11/2/2010 11/02/10 10.0 ND




APPROVED BY: k..CJ4’\JDATE:

___________

K PRIME, INC. SAMPLE ID: HA-i @SURFACELABORATORY REPORT LAB NO: 86618


METHOD: TOTAL METALS BY ICPIMS SAMPLE TYPE: SOILREFERENCE: EPA 3050B16020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 2.50 14.8CHROMIUM Cr 11/04/10 2.50 89.8LEAD Pb 11/04/10 2.50 837NICKEL Ni 11/04/10 2.50 62.0ZINC Zn 11/04/10 2.50 1090


APPROVED BY:

___________

DATE: ///05,42c,o

K PRIME, INC. SAMPLE ID: HA-1@16”-20’LABORATORY REPORT LAB NO: 86619

DATE SAMPLED: 11/01/luK PRIME PROJECT: 9986 TIME SAMPLED: 11:29CLIENT PROJECT: 10-1639 BATCH ID: 101026501



CADMIUM Cd 11/04/10 2.50 NDCHROMIUM Cr 11/04/10 250 137LEAD Pb 11/04/10 250 512NICKEL Ni 11/04/10 2.50 124ZINC Zn 11/04/10 2.50 34.0


APPROVED BY: 1f1J,jDATE: //JL-ow



METHOD: TOTAL METALS BY ICP/MS SAMPLE TYPE: SOILREFERENCE: EPA 3050B!6020A UNITS: mg/Kg


CADMIUM Cd 11/04/10 250 8.11CHROMIUM Cr 11/04/10 250 89.3LEAD Pb 11/04/10 2.50 1200NICKEL Ni 11/04/10 2.50 55.1ZINC Zn 11/04/10 2.50 777


APPROVED BY:bJDATE: ///0510t,c

K PRIME, INC. SAMPLE ID: HA2@1824

LABORATORY REPORT LAB NO: 86621DATE SAMPLED: 11/01/10

K PRIME PROJECT: 9986 TIME SAMPLED: 12:08CLIENT PROJECT: 10-1639 BATCH ID: 101026501



CADMIUM Cd 11/04/10 250 NDCHROMIUM Cr 11/04/10 250 96.5LEAD Pb 11/04/10 250 7.64NICKEL Ni 11/04/10 250 89.0ZINC Zn 11/04/10 250 40.1


APPROVEO BY: JiJDATE: i//os/i—vie

K PRIME, INC.LABORATORY QC REPORT

METHOD: GRO-GASOLINE RANGE ORGANICSREFERENCE: EPA 8015B

METHOD BLANK ID: B11O21OS1SAMPLE TYPE: SOIL

UNITS: mg/kg

SAMPLECONGLIMIT

TPH-G 1.00 I ND

SAMPLE ID:DUPLICATE ID:

BATCH #:SAMPLE TYPE:

UNITS:

DATE EXTRACTED:DATE ANALYZED:

L11021051Dl 10210S1110210S1

SOILmg/kg

11/2/201011/2/2010


TPH-G 5.00 ND 4.70 94 60-140



TPH-G 1.00 4.70 4.46 5.1 ±20

NOTES:

COMPOUND NAME

BATCH #:DATE EXTRACTED:

DATE ANALYZED:

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ND- NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA - NOT AVAILABLE OR APPLICABLE

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METHOD: VOLATILE ORGANICREFERENCE: EPA 5035/8260

COMPOUNDS SAMPLE TYPE: SOILUNITS: pg/Kg


4-CHLOROTOLUENE 106-43-4 1.50 NDTERT-BUTYLBENZENE 98-06-6 1.50 ND124-TRIMETHYLBENZENE 95-63-6 1.50 NDSEC-BUTYLBENZENE 135-98-8 1.50 ND1 ,3-DICHLOROBENZENE 541-73-1 1.50 ND4-ISOPROPYLTOLUENE 99-87-6 1.50 ND1,4-DICHLOROBENZENE 106-46-7 1.50 NDN-BUTYLBENZENE 104-51-8 1.50 ND1 2-DICHLQROBENZENE 95-50-1 1.50 ND1 2-DIBROMO-3-CHLOROPROPANE 96-1 2-8 1.50 ND1 ,24-TRICHLOROBENZENE 1 20-82-1 3.00 NDHEXACHLOROBUTADIENE 87-68-3 3.00 NDNAPHTHALENE 91-20-3 3.00 ND1 ,23-TRICHLOROBENZENE 87-61-6 3.00 ND




PAGE 2 OF 2

K PRIME, INC. SAMPLE ID: B11111OS1LABORATORY QC REPORT SPIKE ID: L11111OS1

DUPLICATE ID: D11111OS1METHOD: VOLATILE ORGANIC COMPOUNDS BATCH #: 111110S1REFERENCE: EPA 5035/8260 SAMPLE TYPE: SOIL

UNITS: pg/Kg


PARAMETER SPIKE SAMPLE SPIKE RECOVER LIMITSADDED RESULT RESULT (%) (%)

1,1 DICHLOROETHENE 30.0 ND 27.9 93 60-140BENZENE 30.0 ND 29.6 99 60-140TRICHLOROETHENE 30.0 ND 27.5 92 60-140TOLUENE 30.0 ND 31.1 104 60-140CHLOROBENZENE 30.0 ND 30.4 101 60-140



1,1 DICHLOROETHENE 1.50 27.9 27.3 2.1 ±20BENZENE 150 29.6 29.0 2.3 ±20TRICHLOROETHENE 150 27.5 25.9 5.8 ±20TOLUENE 1.50 31.1 30.0 3.5 ±20CHLOROBENZENE 1.50 30.4 29.6 2.5 ±20



METHOD: DRO SAMPLE TYPE:REFERENCE: EPA 8015B


DATE ANALYZED:

11021 05111/2/201011/2/2010

SOILUNITS: mg/Kg

METHOD BLANK ID: BI1O21OSI


IDRO 10.0 I ND

SAMPLE ID: LIIO2IOSIDUPLICATE ID: D11021051



DRO 500 ND 472 94 60-140



DRO 10.0 472 482 2.1 ±20


K PRIME, INC. SAMPLE ID: L102610-S

LABORATORY BATCH QC REPORT DUPLICATE ID: D102610-SMETHOD BLANK ID: B102610-S


METHOD: TOTAL METALS BY ICP!MS SAMPLE TYPE: SOLIDREFERENCE: EPA 3050B16020A UNITS: mg/Kg

ELEMENT MB SA SR SP SPD SP RPDmg/Kg mg/Kg mg/Kg mg/Kg mg/Kg %R %

CADMIUM Cd <2.50 100 0.0 97 98 97 0.2CHROMIUM Cr <2.50 100 0.0 99 100 99 0.9LEAD Pb <2.50 100 0.0 107 109 107 1.7NICKEL Ni <250 100 0.0 98 98 98 0.2ZINC Zn <2.50 100 0.0 93 94 93 0.6

NOTES:ND: NOT DETECTEDMB: METHOD BLANK

SA: SPIKE ADDEDSR: SAMPLE RESULTSP: SPIKE RESULTSPD: SPIKE DUPLICATE RESULTSP(%R): SPIKE % RECOVERYRPD: RELATIVE PERCENT DIFFERENCE

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K PRIME Inc.CONSULTING ANALYTICAL CHEMISTS )!2rDwflticJ i1± 2010


TRANSMITTAL

DATE: 12/1/2010

TO: MR. DAVID NOREN ACCT: 9986

EBA ENGINEERING PROJ: 10-1639

825 SCJNOMA AVENUE


Phore: 707-544-0784Fax: 707-544-0866Era4 1: [email protected]

cnoreri@ebagrojp, corn

FROM: Richard A. Kaqel. ?M.B. ..2

_aboratory Ci rector

SUBJECT: LABCRN7DRY RESLJS FOR VCIR RCJEC :0-1639

Enclosed olease md K rie’s laboratory reports fo thetollowng samples:

SAMPLE ID TYPE DATE TIME KPI LAB #SOIL 11/221:0 02:30 87151

The above listed sample group was received on 11/22/10 and tested as requested

on the chain of custody document.

Please call me if you have any questions or need further information.

Thank you for this opportunity to be of service.



SAMPLE ID:LAB NO:

SAMPLE TYPE:DATE SAMPLED:TIME SAMPLED:

HA-3@T87151SOIL11122/20102:30

BENZENETOLUENEETHYLBENZENEXYLENE (M+P)XYLENE (0)

LIMIT1501501 .501 .50

SAMPLECONC

NDNDNDND

SURROGATE RECOVERYDIBROMOFLUOROMETHANETOLUENE-D84-BROMOFLUOROBENZENE

%11310295

APPROVED BY:DATE:

METHOD: VOLATILE ORGANIC COMPOUNDS

REFERENCE: EPA 503518260

COMPOUND NAME

BATCH#; 11171051DATE ANALYZED; 11/23/2010

UNITS; pg/Kg

CAS NO. REPORTING

7 1-43-2108-88-3100-41-41330-20-71330-20-7 1.50 f ND

I



PAGE 1 OF 1



METHOD: DROREFERENCE: EPA 801 SB

SAMPLE TYPE: SOILUNITS: mg/Kg

Diesel Range Organics (C12-C34) with Silica Gel CleanupNot Detected at or above the stated MRLNot Applicable or AvailableMethod Reporting LimitTypical pattern for dieselHeavier hydrocarbons contributing to diesel range quantitationHeavier hydrocarbon than dieselLighter hydrocarbon than dieselUnknown hydrocarbon with a single peakUnknown hydrocarbon with several peaks

APPROVED BY:

_______________

DATE:

______________

SAMPLE ID LAB NO. DATESAMPLED11/22110

BATCHID

112210S1

EXTRACTDATE

11/23/10I HA-3©T 87151 I I I

DATE MRL SAMPLEANALYZED CONC

11/24/10 I 10.0 ND I

DROPATtERN

NOTES:DRONDNA

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PAGE 1 OF 1

K PRIME, INC.LABORATORY METHOD BLANK REPORT METHOD BLANK ID: BI1171OS1


METHOD: VOLATILE ORGANIC COMPOUNDS SAMPLE TYPE: SOILREFERENCE: EPA 5035/8280 UNITS: pg/Kg


BENZENE 71-43-2 150 NDTOLUENE 108-88-3 1.50 NDETHYLBENZENE 100-41-4 1.50 NDXYLENE (M+P) 1330-20-7 1.50 ND

XYLENE (0) 1330-20-7 1.50 ND




K PRIME, INC. SAMPLE ID: B1117IOS1

LABORATORY QC REPORT SPIKE ID: L111710S1DUPLICATE ID: D111710S1

METHOD: VOLATILE ORGANIC COMPOUNDS BATCH #: 11171051



PARAMETER SPIKE SAMPLE SPIKE RECOVER’Y LIMITSADDED RESULT RESULT (%) (%)

1,1 DICHLOROETHENE 30.0 ND 30.3 101 60-140BENZENE 30.0 ND 29.6 99 60-140TRICHLOROETHENE 30.0 ND 27.1 90 60-140TOLUENE 30.0 ND 27.7 92 60-140CHLOROBENZENE 30.0 ND 28.9 96 60-140



1,1 DICHLOROETHENE 1.50 30.3 28.9 4.8 ±20

BENZENE 1.50 29.6 28.4 4.1 ±20


TOLUENE 1.50 27.7 27.0 2.7 ±20CHLOROBENZENE 1.50 28.9 28.2 2.3 ±20

NOTES:ND - NOT DETECTED AT OR ABOVE THE STATED REPOR]1NG LIMITNA - NOT AVAILABLE OR APPLICABLE


METHOD: DRO SAMPLE TYPE:REFERENCE: EPA 801 SB

NOTES:DRO - DIESEL RANGE ORGANICS (C12-C34)ND- NOT DETECTED AT OR ABOVE THE STATED REPORTING LIMITNA NOT APPLICABLE OR AVAILABLE


DATE ANALYZED:

1122108111/22/201011/22/2010

SOIL

COMPOUND NAME

UNITS: mg/Kg

METHOD BLANK ID: B112210S1


DRO 10.0 ND

SAMPLE ID: L11221051DUPLICATE ID: D112210S1



DRO 500 ND 412 82 60-140



DRO 10.0 412 420 1.9 ±20

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APPENDIX E

GEOPHYSICAL REPORT

NOACAL GEOPHYSICAL

CONSULTANTS, INC

December 10, 2010

Mr. David NorenEBA Engineering825 SonomaSanta Rosa,

Avenue, Suite CCalifornia 95405

Subject:

Dear Mr. Noren:

Geophysical InvestigationSonoma Auto and Truck890 BroadwaySonoma, California

NORCAL Job No. 10-282.35

1.0 SITE DESCRIPTION AND PURPOSE

This report presents the findings of the geophysical investigation performed by NORCALGeophysical Consultants, Inc. on a portion of the Sonoma Auto and Truck Facility in SonomaCalifornia. The field survey was conducted on November 1, 2010 by NORCAL CaliforniaProfessional Geophysicist David Bissiri (PGp 1009). Logistical support was provided by DavidNoren of EBA Engineering.

The Sonoma Auto and Truck facility is located on the northwest corner of Broadway and EastMacArthur Street in Sonoma, California. It comprises several showroom and service buildingslocated in the northern and eastern portions and an asphalt parking lot in the southwest portion.The survey area, as designated by EBA Engineering, consists of an approximately 85- by 50-foot rectangular area in the southwest portion of the parking lot (see Plate 1).

According to verbal reports from EBA Engineering, this site was once the location of a gasolinestation dating from the early 1920’s. The station was demolished many years ago, but therecords are unclear as to the final disposition of the USTs associated with the former facility.Though all above-ground structures associated with the former station appear to be gone, asuspected on-grade former pump island still exists and makes up a portion of the sidewalkalong Broadway within the survey area. Because this remnant of the former station still exists, itis thought that additional on-grade or below grade features may also be present. Therefore, thepurpose of the geophysical investigation is to obtain subsurface information to aid in furtheridentifying the location of possible detectable buried metallic and non-metallic objects anddebris, as well as detectable utilities within the limits of the designated survey.

321A BLODGETT STREET COTATI, CA 94931 TELEPHONE (707) 796-7170 . FAX (707) 796-7175

1CAL

www. norcalgeophysicaF.com

6ACA1.

EBA EngineeringDecember 10, 2010Page 2

2.0 FIELD INVESTIGATIONS

2.1 METHODOLOGY

Buried objects and debris are often both metallic and nonmetallic in nature. These materialscan produce subsurface magnetic and conductivity contrasts that can be delineated by certaingeophysical methods. These include, but are not limited to electromagnetic terrain conductivity(TO), ground penetrating radar (GPR), and metal detection (MD) methods.

We used the TC method to delineate variations in the electrical conductivity of the shallowsubsurface to a depth of approximately 7 feet. The effect that metallic or nonmetallic materialwill have on the TC measurements is dependent upon the depth and size of the object, and thecontrast in electrical conductivity with the surrounding materials. We performed the TC surveyusing a Geophysical Survey Systems, Inc. (GSSl) Profiler EMP-400 Electromagnetic Inductioninstrument.

We used the MD (metal detection) method to scan for near surface metal and the presence ofutilities. This method also uses electromagnetic induction, but differs from the TO method in thatonly metallic objects are characterized and no recordable data is obtained. The GPR methodwas used to aid in further characterizing the source of detected MD anomalies. This methodprovides graphic images of the shallow subsurface that are evaluated typically for evidence ofburied objects and disturbed soil. We used a Geophysical Survey Systems, Inc. SIR-3000Subsurface Interface Radar System equipped with a 400 megahertz (MHz) antenna.Descriptions of the TO, MD, and GPR methods are provided in Appendix A.

2.2 TCIMD GEOPHYSICAL SURVEY

Prior to proceeding with the geophysical work, we established a survey grid to providehorizontal control. The position of the grid was based on the four corners of an approximately85- by 50-foot rectangular area delineated by EBA Engineers in the southwest portion of thesite. We created the grid in the field using a fiberglass measuring tape and marking paint. Theorigin (OE, ON) was located along the curb facing Broadway, approximately 10 feet north ofMacArthur Street, with grid nodes marked every 5 feet on the ground. This grid was then usedto guide the TO and MD surveys.

We then conducted a TO and MD survey over the established grid. TO data were acquired atfive foot intervals (stations) along south-north trending traverses spaced five feet apart.Following data acquisition, we transferred the TO data to a personal computer and convertedthe data into a format for contouring. The contouring program (SURFER Version 9.0 byGolden Software) calculates an evenly spaced array of values (grid) based on the observedfield data. Finally, these gridded values are contoured to produce a TO contour map. This mapprovided a general characterization of the conductivity variations and can be used to assess theexistence of buried debris and other subsurface features.

AL


The MD was used to scan along both north-south and east-west trending traverses spaced 5 to10 feet apart. During this reconnaissance, we detected numerous subsurface targets. Thelocations of these targets were marked on the ground surface with pink spray paint andmapped. Subsequently, we used GPR to verify the approximate depths and lateral limits of theMD anomalies.

2.3 GPR SURVEY

We used the GPR to collect radar data within an approximately 34- by 35-foot subarea locatedin the central portion of the larger survey area. We collected GPR data along a series of south-to-north traverses spaced 2-feet apart starting at Grid 10 EastI3O North and ending at Grid 44EastI65 North. The radar data acquired was uploaded to a computer and processed usingGeophysical Survey System Inc.’s RADAN program to produce a series of three-dimensional(3-D) “time-slice” images of the subsurface. These images represent horizontal images (a.k.a.“plan view”) of the subsurface at various depths below ground surface (bgs). These imageswere then evaluated for reflection patterns suggestive of USTs, piping, buried debris, andbackfilled areas.

3.0 RESULTS

The results of the geophysical investigation are presented on the Site Map, Plate 1. The resultsof the TO and GPR surveys are shown on Plates 2 and 3, respectively.

3.1 TCIMD SURVEY

The results of the TC and MD surveys are presented on the Geophysical Survey Map, Plate 1.This map shows the limits of the designated geophysical survey area, pertinent site features,and the locations of the detected subsurface features. These subsurface features include azone of suspected debris and utility alignments. The zone of suspected debris is located east ofthe suspected former pump island in the center of the survey area as depicted by the redshaded figure on Plate 1. This zone is irregular in shape and produced a variable response inthe MD instrument readings, which suggests this zone is comprised of several individual objectsrather than a single object with well-defined boundaries. The TO results presented on Plate 2corroborate this interpretation as the contour closures in the immediate vicinity of the suspecteddebris zone are contorted in a pattern consistent with that due to numerous metallic objectsburied within a debris zones. Additional TO contour closures are evident in the southwest andnortheast portions of the survey area, especially along the boundaries. However the contourclosures in the southwest are attributed to the effects of known above-ground features such asthe traffic signal, light standards, and a fire hydrant, while the closures in the northeast areattributable to suspected underground utilities.

The underground utilities consist of five lines. One line is an active water line parallel to theeastern boundary of the survey area. This line extends northward through the survey area froma water meter box in the sidewalk along East MacArthur Street. The other four utility lines are

VFI6ACAL


undifferentiated utilities located in the vicinity of the suspected debris zone and pump island anddepicted on Plate 1 as the dashed black lines labeled “-uu-”. Two of the lines are orienteddiagonally southwest to northeast and range in length from approximately 15- to 20-feet. One ofthese diagonal lines lies partially within the suspected debris zone and the other is located a fewfeet to the west. Bath of these lines appear to be abandoned and may be associated with aformer structure that was located where the debris zone is now. The other two lines are longerand form a “V perpendicular to the sidewalk along Broadway. One leg of the “T” extendseastward from the southern end of the former pump island for a distance of 37 feet, whereuponanother leg extends southward for a distance of approximately 6-feet and a third leg extendsnorthward a distance of at least 50 feet, out of the survey area. While these utility lines appearto be associated with the former pump island, their purpose could not be determined.

3.2 GPR SURVEY

The GPR results are presented as a 3-D time-slice image on Plate 3. This image is a plan view,or “slice” of GPR data within an approximately 34-foot wide by 35-foot long sub-area of thelarger survey area. The GPR area was approximately centered on the suspected debris zoneand the “slice” represents radar signal amplitude obtained at a depth of approximately 1.8 feetbelow ground surface. Low amplitude reflections are depicted in shades of white and gray,while higher amplitude reflections are depicted in shades of yellow, reds, and purple.

Based on our evaluation of the GPR data, we did not see evidence of USTs or specific targetswithin the debris zone. However, we were able to clearly delineate three of the fourundifferentiated utility lines that exist in this portion of the survey area. These are the two shortdiagonal lines in the vicinity of the debris zone and the eastward trending leg of the “T”extending from the pump island. These lines appear on the GPR image as the linearassemblages of high amplitude reflections in the central and southern portions of the image.The two northward trending legs of the utility line “T” are not clearly evident, which we attributeto a lack of data resulting at exactly this easting position, which resulted from the 2-foot spacingof the GPR traverses.

4.0 LIMITATIONS

In general, there are limitations unique to the geophysical methods used for this investigation.For example, subsurface objects may be buried deeper than the detection capabilities of thegeophysical method. There may be a lack of contrast in physical properties between nativesoils and buried objects. Above or below ground cultural features, such as utilities, fences, anddebris, may cause interference that limits or masks the detection of nearby buried objects.Since the accuracy of our findings is subject to these limitations, it should be noted it is possiblethat not all buried objects or features may be detected or characterized. A more detaileddiscussion of the limitations with regard to each of the geophysical methods used for thisinvestigation is presented in Appendix A.

RCAL


5.0 STANDARD CARE AND WARRANTY

The scope of NORCAL’s services for this project consisted of using geophysical methods tocharacterize the shallow subsurface. The accuracy of our findings is subject to specific siteconditions and limitations inherent to the techniques used. We performed our services in amanner consistent with the standard of care ordinarily exercised by members of the professioncurrently employing similar methods. No warranty, with respect to the performance of servicesor products delivered under this agreement, expressed or implied, is made by NORCAL.

We appreciate having the opportunity to provide our services to you for this investigation.

Respectfully,

NORCAL Geophysical Consultants, Inc.

David BissiriProfessional Geophysicist, PGp-1 009

DJ 8/KG B/if

Enclosure: Plates 1 -3

Appendix A Geophysical Methodology, Instrumentation,Data Analysis and Limitations

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CLIENT: EBA ENGINEERING I PLATENORCAL GEOPHYSICAL CONSULTANTS INC. 1E MACARTHUR STREET

DATE: DEC. 2010 DRAWN BY: G.RANDALL APPROVED BY: DJB

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Geophysical Methodology, Instrumentation,Data Analysis and Limitations

H16ACAL

4

Terrain Conductivity (TC)

Methodology

The TO method provides information on the lateral variation of the electrical conductivity of thesubsurface. These changes in conductivity can arise from natural changes in soil composition orfrom buried foreign objects. Operating on the principle of electromagnetic induction, themethod utilizes an instrument having two coils separated by a fixed distance. One of these coilstransmits a primary radio-frequency signal that induces a current flow (secondary signal) in theearth. The other coil senses a secondary signal resulting from the induced current flow. Formeasurement purposes the secondary signal is broken down into both quadrature and in-phasecomponents. The quadrature component is used to determine the value of electrical conductivityand is often measured in either millisiemens/meter (mSIm) for absolute units or parts-per-million(ppm) for relative units. This component is useful for detecting both metallic and non-metallicobjects. The in-phase component also changes with conductivity, but varies in a differentfashion than the quadrature component. This component is useful when only the location ofmetallic objects is of interest. In-phase measurements are expressed in parts-per-million (ppm).

The principle behind the electromagnetic induction method is based on the fact that when highlyresistive material is subjected to a time-varying electromagnetic field (such with RF) there is alinear relationship between the quadrature component and conductivity. In contrast, when highlyconductive materials like metals are encountered, both quadrature and in-phase components canbe quite large and their behavior is often non-linear. When trying to characterize resistivematerial, such as soil and rock, measurement of the quadrature component is most useful, thoughthe quadrature component is also affected by conductive metals. When only trying tocharacterize metallic material, then the In-phase component is typically used.

Instrumentation

The instrument used by NORCAL for shallow subsurface investigations is a Geophysical SurveySystems MuLti-Frequency Profiler EMP 400 terrain conductivity meter. This instrument consistsof transmitting and receiving coils mounted at opposites ends of a horizontal boom with a controlconsole in between. The separation distance of the coils is approximately 4 feet. By using up tofour selectable induction frequencies ranging from 1 KHz to 16 KHz at the same time, differenteffective sampling depths can be obtained. In most cases these sampling depths range fromless than a foot to greater than 15 feet. Data is obtained by carrying the instrument at ankle-leveland taking readings taken at regular intervals, usually between 2-to 10-feet apart. The resultingTC data is automatically stored in digital memory, along with station locations and any field notes.

Computer Processing

TO data are typically processed in the field on a portable computer. The uploaded data areconverted into a format suitable for contouring using the program SURFER from Golden

CAL

Software. This program calculates an evenly spaced array of values (data grid) based on themeasured field data which are then contoured to produce TC contour maps of each inductionfrequency for interpretation.

Contour Map Interpretation

Generally speaking, in a region with fairly uniform conductivity conditions the TC values will varysmoothly from one area to another. Under these conditions, contour lines are usually spaced farapart. In contrast, in those areas where lateral TC variations are stronger, the contours are moreclosely spaced. In some cases the variations are so strong that the contours become highlycontorted. These contorted contours may form roughly concentric circles suggestive ofbull’s-eyes, tightly wound loops and whorls similar to finger prints, or elongated parallel lines.Actual magnitude and shape of the contour lines is dependent on the how rapidly the conductivityof the subsurface changes and if there are any metallic objects present that can affect theinstrument readings.

Roughly concentric circles are generally referred to as monopoles. Monopoles that are roughlylimited in extent to the data point spacing of the sampling grid are often caused by relatively small,near surface metallic objects with limited cross-section. These typically consist of well caps, pullboxes, balls of wire, etc. On the other hand, larger monopoles that extend across an area ofseveral data points are typically associated with larger, deeper objects such USTs, concretepads, backfilled zones, etc.

Irregular patterns of loops and whorls are often indicative of several conductive objects withvariable shape, size, conductivity, and distribution being present. These irregular TC patternsare the most difficult to interpret. Past experience has shown that such patterns are usuallyassociated with debris fields, landfills, and demolition sites.

A series of generally parallel contour lines typically indicates the source is an elongate object suchas a building wall, fence, or underground pipeline. If the parallel contours are more or lessstraight, then this indicates the object was oriented roughly parallel to the direction of the EM31 ‘scoil boom during data collection. If the contour lines form a series of parallel, undulating contours(also referred to as a “herring bone” pattern), then this indicates the source was oriented roughlyperpendicular to the EM31’s boom during data collection.

Regardless of whether the contours form discrete monopoles, irregular patterns, or parallel lines,if there are no obvious nearby above ground sources that could cause such variations, thensubsurface objects are suspected. TC contours are typically considered anomalous whendifferences larger than a few tens of milliSiemens per meter (ms/rn) are displayed from one datastation to the next.

Limitations

Buried ferrous metal objects often produce large localized variations, or anomalies, in terrainconductivity. As a general rule, anomaly magnitude typically decreases, and anomaly widthincreases, as distance (depth) to the source increases. This can make detection of small, deeply

buried metallic objects difficult. In addition, the ability to detect a buried metal object is based onthe intensity of these variations in contrast to the intensity of background variations. Theintensity of background variations is based on the conductivity of the soil and the amount of aboveand below ground metal present within a survey area. Cultural features such as chain linkfences, buildings, debris, railroad spurs, utilities, above ground electric lines, etc. typicallyproduce variations with high intensities. These variations may mask the TC effects of buried metalobjects and thus make it very difficult to determine whether the variations are associated withbelow ground metal or known above/below ground cultural features.

Apart from the physical imitations of the instrument and the unwanted effects from secondaryobjects, the ability to detect subsurface features is also dependent upon the density of dataacquisition points. If the distance between data acquisition points is significantly larger than thesize of the target object, then the object may not be detected.

Metal Detection (MD)

MD MethodoloQy

This method uses the principle of electromagnetic induction to detect shallowly buried metalobjects such as USTs, metal utility conduits, rebar in concrete, manhole covers, and variousmetallic debris. This is done by carrying a hand-held radio transmitter-receiver unit above theground and continuously scanning the surface. A primary coil broadcasts a radio signal from atransmitter which induces secondary electrical currents in metal objects. These secondarycurrents in turn produce a magnetic field which is detected by the receiver.

Instrumentation

The MD instrument that we typically use for shallow subsurface investigations is a Fisher TW-6pipe and cable locator. This instrument is expressly designed to detect metallic pipes, cables,USTs, manhole covers, and other large, shallowly buried metallic objects. The instrumentoperates by generating both a meter reading (unitless) and an audible response when near ametal object. The peak instrument response usually occurs when the unit is directly over theobject. The TW-6 does not provide a recordable data output that can be used for later computerprocessing. Results are generally limited to marking the interpreted outlines of detected objectsin the field and mapping their locations.

Limitations

In general, the response of the MD instrument is roughly proportional to the horizontal surfacearea of near surface buried objects (typically in the upper three or four feet). This relationshipcan be used to advantage in discriminating between metal debris, reinforced concrete pads, andpipelines. However, in the presence of above ground metal objects such as fences, walls, parkedcars, and metal debris, this is no longer valid. In some instances, the presence of such objectscan make it very difficult to determine whether the instrument responses are associated withbelow ground targets or above ground cultural features. When multiple sources are present it

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may not be possible to identify individual targets. Also, relatively large objects that have a limitedhorizontal cross-section such as well casing and fence posts are sometimes difficult to detect.

Ground Penetrating Radar (GPR)

GPR Methodology

Ground penetrating radar is a method that provides a continuous, high resolution graphicalcross-section of the shallow subsurface. The method entails repeatedly radiating anelectromagnetic pulse into the ground from an antenna as it is moved along a traverse.Reflected signals are received by an antenna (often the same one used to generate the signal)and sent to a control unit for processing. The control unit then converts the varying amplitude ofreflected radar signals as a function of time into a cross-sectional image showing signal amplitudeas a function of depth.

GPR is particularly sensitive to variations of two electrical properties. One property isconductivity (the ability of a material to conduct a charge when a field is applied) and the other ispermittivity (the ability of a material to hold a charge when a field is applied). These twoproperties determine how far a signal can propagate. They also determine the strength ofreflected signals that can be generated at material boundaries. Reflections result because of thedifferences in these electrical properties on either side of a boundary.

Most soil and earthen-like materials such as concrete are electrically resistive and have arelatively low permittivity. As a result, they are relatively transparent to electromagnetic energy.This means that only a portion of the radar signal incident upon them is reflected back to thesurface. On the other hand, when the signal encounters an object composed of a material thathas the opposite electrical properties, especially one with a high permittivity (such as metal) muchof the incident energy is reflected. This difference in transmittivity and reflectivity determineshow deep a given radar signal can penetrate into the ground and still yield interpretable results.

Instrumentation

We typically perform GPR surveys using a Geophysical Survey Systems, Inc. SIR-3000Subsurface Interface Radar System equipped with either a 400 or 500 megahertz (MHz)transducer. This unit is comprised of a combined control/data recording console that isconnected by a telemetry cable to the antenna. This system is often chosen for investigatingenvironmental sites since it usually provides both the resolution and depth penetration needed forcharacterizing the upper three to four feet of the subsurface.

Data Interpretation

The interpretation of GPR data can be done in two ways. The first is referred to astwo-dimensional (2-D) and involves examining the graphical records for reflections from buriedobjects. 2-D GPR records represent a vertical “slice” of the subsurface along a single traverse(or profile) which displays changes in reflected signal strength with horizontal position as afunction of arrival time. Reflections that arrive earlier in time are placed in the upper portions ofthe record and reflections that arrive later are placed lower, towards the bottom of the records.Horizontal position is across the top of the record, For display purposes, almost any color range

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can be used to denote differences in reflected signal strength, but typically a simpleblack-and-white display is used.

In areas with relatively uniform conditions, with no buried objects producing reflections, 2-Drecords, or profiles, typically appear as a series of alternating dark and light horizontal bands. Inareas where there are subsurface objects producing reflections, the horizontal banding isdisrupted. Discrete objects typically produce reflections having the appearance of inverted “U’s,forming what are known as “hyperbolic reflections”. Metallic objects often produce markedlystrong reflections, in many cases forming multiple reflections appearing as a series of inverted U’scascading down the record. Non-metallic objects can produce similar reflections, but themultiples are typically much weaker.

A sample profile from a different site with five adjacent steel USTs is presented below:

Sample Ground Penetrating Radar Proteof

top of tankground surface

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Note: the “Time DeptlY 0735 nanosecondsat the bottom of this profile correspondsto a true depth of approxhnatety 5 feet forthis example only. Actoal depth to bottomof other profiles may be different.

An object’s burial depth may also be estimated from GPR profiles. As mentioned above, GPRmeasures signal amplitude as a function of time. However, the translation of the radar signal’stravel time (technically known as time-depth) to an actual distance (true depth) is not always asimple one. Strictly speaking, in order to translate from time-depth to true depth the signalvelocity within each time interval must be known. Since this is not routinely determined in thefield, estimated velocities are often used for determining the approximate depth to a reflector.The empirical values for GPR signal propagation velocities within commonly encountered soilsare obtained from published tables.

The second way GPR data can be displayed is referred to as a three-dimensional (3-D) time-slice.In this case, the data is displayed as a horizontal “slice’ of a plan area at a specified depth belowgrade. The data is obtained from multiple parallel 2-D traverses and are processed to displayvariations in signal amplitude in both horizontal and vertical directions. A sample time-slice from

Five Underground Storage Tanks(cross-sectional view)

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a site different than the one investigated in this investigation is presented below.

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Time-Slice image of two former pump islands buried under approximately 2-foot of asphalt andbase material. Diagonal linear feature extending from top center to lower right is an electricalconduit located below asphalt but above former pump islands.

Limitations

The ability to detect subsurface targets is dependent on specific site conditions. Theseconditions include depth of burial, the size or diameter of the target, the condition of the specifictarget in question, the type of backfill material associated with the target, and the surfaceconditions over the target. Typically, the depth of detection will be reduced as the clay and/ormoisture content in the subsurface increases. As a result, depths of detection (using a 500 MHzantenna) typically range from as deep as six feet to as little as a few inches.

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