orange county water district south basin # d-1712505 remedial … · 2018. 6. 28. · beneficial...

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Orange County Water District South Basin # D-1712505

Remedial Investigation Workplan 6-25-18

Objective Produce information necessary to support the design and implementation of a groundwater remediation project to prevent or cleanup contamination of groundwater that serves or has served as a source of drinking water. Background The South Basin remedial investigation (RI) will investigate a comingled plume originating from more than 20 industrial locations. The plume is two miles long and more than one mile wide. The contaminants of concern (COCs) include volatile organic compounds (VOCs) and perchlorate. The plume, located in Santa Ana, Irvine, and Tustin, CA is bounded by Edinger Avenue, Main Street, the I-405 Freeway, Red Hill, and Von Karman. The uncontrolled plume occurs predominately in the shallow aquifer at 100-foot depth which flows into a deeper Principal Aquifer, bringing VOC contaminants with it. So far, contaminants have arrived in two municipal drinking water wells. The Principal Aquifer provides 350,000-acre feet per year or 77 percent of the potable water supply for 2.4 million people in central and northern Orange County. The Project includes a RI and feasibility study (RI/FS) performed in compliance with the National Contingency Plan (NCP).

Groundwater in the South Basin contamination plume is located within two Groundwater Management Zones established by the Santa Ana Regional Water Quality Control Board (Region 8) in the Santa Ana Water Quality Control Plan. These zones are the Orange Groundwater Management Zone and the Irvine Groundwater Management Zone. Beneficial uses for these two Groundwater Management Zones are municipal and domestic supply, agricultural supply, industrial service supply and industrial process supply.

The purpose of this study is to analyze options and select an interim remedial action plan that will protect the underlying drinking water aquifers. Much work has been done in the South Basin over the past several decades, however most of it in piecemeal fashion. Only in limited instances has the work included the capture and restoration of groundwater downgradient of the various source sites. This RI/FS will look at the overall comingled plume and make plume-wide recommendations on its control and restoration. The South Basin includes more than 60 sites that in some cases consist of small-scale plumes limited within the property line of the offending industry and in other cases are much larger, with plumes extending great distances offsite. In most cases, the off-site plumes have comingled into the overall south basin plume more than two miles long. The regulatory agencies overseeing these many sites include the RWQCB and the DTSC. While the OCWD appreciates their work and the directives issued to responsible parties over the past 30 years, we cannot wait for that PRP group to someday come together for characterizing and cleaning up the offsite contamination. After more than a decade without a comprehensive PRP response, the OCWD now sees the need to move forward with the RI/FS on its own initiative. The District has signed a cost reimbursement agreement with the RWQCB. NCP-compliant work products that are part of the RI/FS will be submitted to RWQCB and DTSC for their review and comment.

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Figure 1 - Project Area

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Monitoring Well Installations A database has been prepared for the South Basin project. The database has been reviewed and existing information has been evaluated to assess data gaps. A draft RI work plan (Field Sampling Plan [FSP]), updating the Quality Assurance Project Plan (QAPP)) has been prepared to address identified data gaps. Presently, seven data gap locations have been identified in which clusters of monitoring wells will be installed at multiple depths to obtain water quality and hydrogeologic data needed to complete the FS. Six well cluster locations that are being addressed now include constructing four monitoring wells in each location, aquifer testing and water sampling. The work is complete. It is expected that the vapor intrusion pathway will be conducted by PRPs as part of their site investigations and cleanup, therefore assessing this pathway will not be done as part of the District’s efforts on the RI/FS.

The grant agreement approves a study that included twenty-one (21) monitoring wells in seven (7) well‐clusters at locations shown on Figure 1. As the project progressed one of those originally proposed wells (SAM-12), not shown, was removed from the study at the request of the DTSC. The remainder of the wells have already been installed. These wells will assess the lateral and vertical distribution of volatile organic compounds (VOCs) and other contaminants in shallow groundwater. All of the monitoring wells will be installed in public rights-of-way (ROWs), with one cluster in the City of Santa Ana and the other five in the City of Irvine. Using roto-sonic drilling, OCWD’s well drilling contractor will advance a boring to around 130 feet below ground surface (bgs) and install the deepest of the four wells in each of the six clusters. The lithologic logs from the sonic borings will be used to design the screened intervals for up to three shallower wells in each cluster, which will be drilled using a hollow-stem auger (HSA) rig. A single drilling contractor with both sonic and HSA capabilities was used to permit, install, and develop the monitoring wells. Tasks such as mobilization were billed on a lump sum basis; however, drilling and well installation are billed on a per foot basis, giving the drilling contractor considerable incentive to complete the work as efficiently as possible. Geologists were responsible for providing field oversight, logging the borings, designing the monitoring wells, documenting well construction and development, installing dedicated pumps and pressure transducers in each well, conducting aquifer tests, and conducting two rounds of baseline groundwater sampling. The quality of the lithologic logs from the sonic borings, the resulting well designs, and the groundwater level and quality data obtained from the wells are critical to the success of the RI. The schedule and planning process allowed for flexibility to accommodate the challenges associated with working in public ROWs. A realistic and achievable goal was set to install the six sonic borings sequentially in a single mobilization with one, two, or three HSA rigs following behind to install the shallower wells, also in a single mobilization. Another goal was to clear the well locations for subsurface obstructions before the drill rig arrives on site. Schedule was based on beginning the project at the SAM-7 site with a roto-sonic drilling rig to drill and sample the deepest well in that cluster, SAM-7D, for the estimated 3 to 4 days required to design and install SAM-7D. Once SAM-7D was installed, the sonic rig moved to the deep well in the SAM-8 cluster, repeat the process outlined above, move to the SAM-9 cluster, and so on. Concurrent with moving the roto-sonic rig to the SAM-8 cluster, the first HSA rig (HSA #1) will start installing the three shallow wells in the SAM-7 cluster. Whereas roto-sonic drilling and deep well construction will take 3 to 4 days, installation of the up to three shallow HSA wells at each cluster will take between 7 and 8 days. Thus, as the project progresses, the roto-sonic rig will “pull-ahead” of the HSA rig such that by the time the sonic rig completes SAM-9D, the driller could mobilize a second HSA rig (HSA #2) to start construction of the shallow SAM-9 wells. When the deep wells were completed, and the roto-sonic drill rig demobilized, a third HSA rig (HSA #3) was mobilized to install the three shallow wells in the SAM-11 cluster. The drilling operations followed this type of program to maximize the utilization of drillers, staff and time. Video surveys documented each well following development. If any evidence of damage or material deficiencies is observed, it was

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repaired or the well replaced. Copies of the video surveys will be included in the Well Construction Report. Aquifer Pump Testing: Well Development - On average, it took one day to develop each of the wells in each cluster. Each was developed within 48 hours of installation of the last well in the cluster, thereby minimizing work in the public ROW. At the end of well development, step-rate pumping tests in each well were performed to estimate sustainable pumping rates for dedicated pump sizing and constant-rate aquifer testing purposes. Using this information, dedicated pumps and related equipment were sized and ordered. Following development of all the wells in a cluster, a composite water sample representing the four wells was collected, submitted to the project laboratory, and analyzed for compliance with the Orange County Sanitation District’s (OCSD’s) discharge limits. This information was provided to OCSD in compliance with a Special Purpose Discharge Permit allowing for direct discharge of aquifer test water to the sanitary sewer, thereby eliminating the costs associated with temporary containment. Aquifer Testing - The aquifer performance test(s) at each cluster were performed between May 30 and August 16, 2017. During this period, encroachment permits were obtained from the cities of Irvine and Santa Ana and the dedicated pumps and transducers installed and tested. In addition, final arrangements for direct discharge of the produced water to the sanitary sewer will be made with the OCSD. Prior to test initiation, the Level Troll data loggers were programed to log measurements with an initial high frequency to record water level changes in the pumping and observation wells. Allowing sufficient pre-test time to document static conditions and post-test time to monitor recovery, each 6-hour pumping test was performed over one long day. The dedicated equipment was installed, the aquifer tests performed, and aquifer data downloaded and analyzed to provide hydraulic parameter estimates of the various transmissive zones. Six-hour, constant-rate aquifer tests were performed in the eight highest-yielding monitoring wells between the dates of December 5 and 15. Short-term (i.e., one to two hours), variable-rate tests were performed in the other thirteen, low-yield wells during purging associated with the first groundwater sampling event. The variable-rate tests were performed between the dates of December 18 and 27. Short-term step-rate tests were performed in all twenty-one wells at the conclusion of development to provide estimates of specific capacity for sizing of the dedicated sampling pumps and aquifer test planning. In addition, the variable-rate tests conducted during well purging were generally conducted in a step-rate fashion. The tests consisted removing known volumes of water from the wells at controlled rates and monitoring the water level response to the stress. Because the wells in each cluster are completed with different designs (i.e., none of the wells were true observation wells), all of the aquifer tests were considered single-well tests for analysis purposes. Because single-well aquifer tests are known to provide unreliable estimates of storativity, the estimated hydraulic parameters are limited to transmissivity and hydraulic conductivity. Baseline sampling of the wells was initiated approximately 48 hours after the aquifer tests were completed using dedicated pumps to purge three well volumes prior to sample collection. Baseline and confirmation sampling was performed in accordance with in accordance with the procedures in the SAP. A second, confirmation sampling event, utilizing the same methods and procedures but with an abbreviated laboratory program was conducted four weeks after completion of the baseline sampling event. Purge water generated during well sampling was discharged to the sanitary sewer pursuant to a Special Purpose Discharge Permit.

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Addressing Data Gaps: The RI study being performed in the South Basin is focused on the filling of data gaps. As already described the study area extends more than 2 square miles and includes dozens of sources, many that have seen investigations before. In addition, the OCWD has performed transient analysis of shallow groundwater using an extensive installation of direct-push temporary geo-probes. That data and other published information were reviewed and brought current by the OCWD consulting firms hired to perform this NCP-compliant remedial investigation. The Additional Groundwater Assessment Field Sampling Plan and Quality Assurance Project Plan Addendum (FSP) for the OCWD South Basin describes additional assessment activities to be conducted in support of the Remedial Investigation and Feasibility Study (RI/FS) primarily located in the cities of Santa Ana, Irvine, and Tustin, California (the Study Area). Specifically, the FSP describes additional groundwater assessment activities that will be conducted to further characterize the hydrogeology and extent of contamination in areas of the SBGPP that have been identified as having key data gaps; and provide data to support the development of appropriate remedial actions. A description of the process of identifying key data gaps and results of the analysis follows. Following implementation of the additional groundwater assessment activities described in the FSP, results of the assessment will be evaluated and any potential new or additional data gaps requiring further assessment will be identified. There was a small network of regional groundwater monitoring wells within the South Basin area and more than 500 monitoring wells installed as part of contaminant investigation programs at many “source sites” located within the SB. Since 2008, the OCWD has conducted groundwater RI activities and maintains a database of groundwater data including data from the OCWD regional monitoring wells as well as individual “source site” monitoring wells for which data is readily available for download from the California State Water Resources Control Board GEOTRACKER. A Preliminary RI report prepared by a separate OCWD consultant (Aquilogic), dated October 2015, was available for review in preparation for this plan. Results of that investigation indicated that contaminants have been detected at concentrations exceeding one thousand times maximum contaminant levels (MCLs) in the groundwater in the shallow aquifers less than approximately 100 feet below land surface (bls). The principal COCs within the SBGPP include trichloroethene (TCE), tetrachloroethene (PCE, also known as perchloroethylene), 1,1-dichloroethene (1,1-DCE), 1,4-dioxane, perchlorate, and hexavalent chromium (Cr[VI]). Detections of contaminants have also been reported in water supply wells that withdraw groundwater from the deeper aquifer units, notably supply well IRWD-3 which is screened in both the Principal Aquifer and Deep Aquifer systems. Non-pumping groundwater levels in supply well IRWD-3 and Shallow Aquifer system monitor wells SAM-4/1 to SAM-4/3 indicate a downward vertical gradient exists between the Shallow Aquifer System and the Principal/Deep Aquifer systems (Figure 1). The downward vertical gradient indicates the potential for downward migration of principal COCs from within and to below the Shallow Aquifer System. This vertical migration potential is of primary concern and needs to be addressed by existing and proposed additional RI monitor wells within the Study Area. The available water level, water quality, and hydrostratigraphic data was compiled and reviewed to evaluate the critical data gaps in portions of the Study Area downgradient of “source sites”. Specifically, the following key questions were addressed during the data gap review:

What is the lateral/vertical extent of principal COCs exceeding drinking water MCLs and/or Notification Levels (NL)?

What is nature of hydrostratigraphic units and principal COC migration pathways in the Shallow Aquifer System?

What is the direction of groundwater flow and gradient in and between hydrostratigraphic units?

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The focus of the data gaps assessment was on evaluating monitor well coverage within the SB at different depth intervals within the Shallow Aquifer System. Based on data from wells SAM-1 through SAM-6 and the OCWD Basin model, the bottom of the Shallow Aquifer System (Alpha Aquifer) within the Study Area ranges from approximately 100 to 190 feel bls. The depth intervals evaluated for the Data Gaps analysis are as follows:

Less than 35 feet bls

35 to 55 feet bls

55 to 75 feet bls

75 to 130 feet bls

130 to 200 feet bls The 10-microgram per liter plume contour for the most widespread principal COCs (TCE, PCE, 1,1-DCE), and perchlorate in the three units above 75 feet bls from the 2012 plume maps presented in the Preliminary RI report were posted and compared to locations of existing monitor wells known to be screened within the respective depth interval. Additionally, 1,4-dioxane is a widespread principal COC that is not depicted as the extent lies within the extent of TCE, PCE, and 1,1-DCE. Since plume maps were not prepared for the depth intervals greater than 75 feet bls in the Preliminary RI investigation, the approach for these depth intervals included comparing color coded postings of the most recent (thru 2012) maximum individual concentration of the widespread principal COCs to locations of the existing monitor wells known to be screened within the respective depth interval. This data gaps analysis resulted in identification of seven locations within the SBGPP where additional monitor wells should be installed to further characterize: the lateral/vertical extent of principal COCs; the nature of hydrostratigraphic units; and the direction of groundwater flow/gradient in and between hydrostratigraphic units. Each monitor well location would comprise 4 to 5 individual monitor wells completed at different depths (monitor well cluster). Two of the monitor well clusters (SAM 6 and SAM 7) are located interior to the commingled plumes in the SB. The remaining 5 monitoring well clusters are located near the perimeter of the Study Area. Remedial Investigation Workplan Deliverables

Deliverables to be submitted to the TAC for comments and the Grant Manager for approval:

Well Completion Report, including well completion logs

MRP to include analytical sampling and water level data for new and existing monitoring wells GeoTracker

Final reports will be uploaded to Geo Tracker Scope Changes

Changes from the approved Remedial Investigation Workplan will be submitted to the TAC for comments and to the Grant manager for Approval

Remedial Investigation (RI) Report

New investigation data along with existing South Basin data will be summarized in an RI report. The report will describe the nature and extent of groundwater contamination in the South Basin and include a description of the release sites where adequate data exists in the record. The report will also describe how particular sites are acting as a continuing source of groundwater contamination. This RI will not include OCWD access to the private property of PRPs.

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The RI Report will follow relevant EPA guidance and incorporate the following: compiled soil and groundwater data from the project database; information from OCWD’s Water Resources Management System (WRMS); previous reports documenting the District’s field investigations; relevant published information; relevant information and interpretations prepared for or on the behalf of the District, particularly as they pertain to the study area’s hydrogeologic conditions Since the focus of the interim remedy is prevention of the further migration of contaminants that were released at numerous sites in the South Basin area, the RI will focus on: (1) describing nature and extent

of COCs in groundwater in the South Basin area and (2) describing the degree of impact of on‐going COC mass flux from respective release sites. The degree of on‐going COC mass flux at each site will be evaluated based on soil and groundwater data collected near the respective source features (as compared to screening levels and drinking water standards) and the effectiveness of any existing

groundwater remediation to prevent future off‐site migration, to the extent that a system currently exists (based on remediation system performance data). The RI report will also describe the transport of COCs in groundwater within the South Basin area based on observed concentrations of parent/daughter products, where applicable, and published literature pertaining to transport of respective COCs. The combination of release site information, hydrogeologic conditions, nature and extent of COCs in South Basin area groundwater, and the transport of respective COCs will be used to develop a conceptual site model (CSM). The CSM will acknowledge known impacts to the underlying water resource currently being used for water supply purposes and will also include potential direct pathways from shallow groundwater to deeper groundwater, such as former irrigation wells and/or windows of higher hydraulic conductivity sediments within intervening aquitard(s). Regional cross sections presented in the RI Report will be based on existing regional cross sections developed by the District in support of water resource management activities. Remedial Investigation Report Table of Contents

Deliverables to be submitted to the TAC and SAG for comments, the Grant Manager for approval:

Site history, past investigations, and the purpose

Project area’s and scope

Field work activities completed

Methods used

Supporting documentation and field notes including: well construction, development, water levels, soil and/or groundwater sampling.

Findings

Lithology (well logs and geologic cross-sections)

Analytical results (laboratory data sheets and chain-of-custody sheets)

Water levels (table including date of water level measurement, depths to groundwater, and groundwater elevations)

Groundwater gradient and flow direction (groundwater contour map, gradient calculation).

Evaluation of data by the Grantee

Assessment of the nature and extent of contamination including plume maps for individual contaminants within each water bearing zone and time-series plots.

Conclusions and/or suspected source of contamination.

Identification of further investigations necessary.

Quality assurance and quality control procedures, QAPP

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Baseline Human Health Risk Assessment

Deliverables to be submitted to the TAC for comments and the Grant Manager for approval

Identifies threats to human health from potential exposure to contaminated groundwater using existing data and information from the remedial investigation.

Feasibility Study (FS) Workplan

Deliverables to be submitted to the TAC for comments and the Grant Manager for approval

Objectives and the steps needed for the prevention and/or cleanup of groundwater contamination

Technical and cost analyses of alternatives

List of Remedial Action Objectives

Applicable or relevant and appropriate requirements (ARAR) analysis

Groundwater flow modeling for evaluating potential implementation projects Feasibility Study

Deliverables to be submitted to the TAC and SAG for comments and the Grant Manager for approval

Evaluate and develop interim remedial alternatives

Conduct a feasibility study

Summarizes the activities conducted including the results Feasibility Study Report Table of Contents

Project Area’s history, geology, hydrogeology, surface water, local land use, previous investigations, and remedial actions.

Nature and extent of constituents of concern (COCs)

Contaminant properties and transport based on soil and aquifer properties.

Proposed remedial action objectives

Description of the remedial action alternatives.

Evaluation of the remedial action alternatives

Determine the need for treatability studies and additional investigations in the Project area.

Estimate of life cycle costs and schedule for each alternative. Public Outreach

Develop outreach materials including flyers, posters, brochures, and advertisements, website social media web pages to include Project progress and outcomes.

Provide copies and web links to the Grant Manager.

Conduct a public workshop, inviting relevant non-governmental organizations and disadvantaged community representatives, prior to finalization of the Feasibility Study

Submit the workshop materials, sign-in sheet(s), and photo documentation of the workshop to the Grant Manager.

Disclosure Statement

“Funding has been provided in full or in part through an agreement with the State Water Resources Control Board using funds from Proposition 1. The contents of this document do not necessarily reflect the views and policies of the foregoing, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.”

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Progress Reports

Quarterly progress reports due within forty-five (45) days following the end of the calendar quarter (March, June, September, and December) to the Grant Manager.

Reports will include a brief description of activities and any problems encountered

An updated schedule for completing the project

Documentation of activities and expenditures in progress reports, including work performed by contractors.

As Needed Information or Reports

Reports, data, and information as may be reasonably required by the Division, including but not limited to material necessary or appropriate for evaluation of the funding program or to fulfill any reporting requirements of the state or federal government.

Draft Final Reports

Draft sent to the Grant Manager for review and approval Final Project Report

Addresses, comments made by the Grant Manager on the draft

One (1) reproducible master copy and an electronic copy of the final.

Upload an electronic copy of the final report in pdf format to the FAAST system. Final Project Summary

Consists of a brief summary of the information contained in the Final Project Report, using a format provided by the Grant Manager, and include accomplishments, recommendations, and lessons learned, as appropriate.

Upload an electronic copy of the Final Project Summary in pdf format to the FAAST system. Notification Section

OCWD will notify DFA/TAC 3-4 weeks in advance of any field activities in the SB for site visits.

Attachment 1 Well Construction Details Attachment 2 Groundwater Contour Maps Attachment 3 Plume Maps

Table 1Well Construction Details

OCWD SBGPP, Orange County, CAPage 1 of 1

Start Completion Top Bottom Material Schedule Top Bottom Top Bottom Top Bottom Top Bottom Top Bottom Top Bottom

SAM-7A 2202542.9 6070810.1 54.03 HSA 7/10/2017 7/11/2017 51.5 22.77 31.26 - - - - 4 - - PVC 80 - - - - 39.5 49.5 0.02 1 39.5 2x12 37.5 51.5 33.5 37.5 2 33.5

SAM-7B 2202543.7 6070785.2 54.42 HSA 7/6/2017 7/7/2017 86.5 23.01 31.41 - - - - 4 - - PVC 80 - - - - 81 86 0.02 1 81 2x12 79.5 86.5 75.5 79.5 2 75.5

SAM-7C 2202542.5 6070824.0 54.14 HSA 6/28/2017 7/5/2017 114 22.02 32.12 112 114 4 - - PVC 80 - - - - 106 111 0.02 1 106 2x12 104.5 112 100.5 104.5 2 100.5

SAM-7X(5) - - - - - - Sonic 6/5/2017 6/9/2017 150 -- -- 130 150 4 10, 45, 80, 117, 129 PVC 80 128 133 118 128 0.02 1 118 2x12 116.5 130 112.5 116.5 2 112.5SAM-7D 2202544.1 6070771.0 54.46 Sonic 8/3/2017 8/8/2017 135 22.40 32.06 128 135 4 10, 45, 80, 120, 127 PVC 80 126 131 121 126 0.02 1 121 2x12 118 128 113 118 2 113

SAM-8A 2199941.8 6072800.8 34.99 HSA 5/25/2017 5/26/2017 48.5 8.37 26.62 44 48.5 4 - - PVC 80 - - - - 33 43 0.02 1 33 2x12 31.5 44 27.5 31.5 2 27.5

SAM-8B Not installed due to absence of saturated granular interval

SAM-8C 2199933.0 6072805.6 34.80 HSA 5/22/2017 5/24/2017 78 5.04 29.76 77 78 4 - - PVC 80 - - - - 65.5 75.5 0.02 1 65.5 2x12 63 77 59 63 2 59SAM-8D 2199950.6 6072795.8 34.90 Sonic 5/16/2017 5/19/2017 120 5.11 29.79 95 120 4 10, 50, 81, 94 PVC 80 92 97 82 92 0.02 1 82 2x12 80 95 76 80 2 76

SAM-9A 2198351.3 6074471.0 32.80 HSA 6/5/2017 6/6/2017 43.5 7.94 24.86 - - - - 4 - - PVC 80 - - - - 37.5 42.5 0.02 1 37.5 2x12 36 43.5 32 36 2 32

SAM-9B 2198353.5 6074444.6 32.71 HSA 6/1/2017 6/2/2017 55.5 6.4 26.31 - - - - 4 - - PVC 80 - - - - 49.5 54.5 0.02 1 49.5 2x12 48.5 55.5 44.5 48.5 2 44.5

SAM-9C 2198350.3 6074482.7 32.76 HSA 5/31/2017 6/1/2017 71 4.77 27.99 65 71 4 - - PVC 80 - - - - 58.5 63.5 0.02 1 58.5 2x12 57 65 53 57 2 53SAM-9D 2198352.5 6074458.1 32.74 Sonic 5/22/2017 5/24/2017 130 4.13 28.61 84 130 4 10, 40, 70, 84 PVC 80 82 87 72 82 0.02 1 72 2x12 70 84 66 70 2 66

SAM-10A 2201069.0 6075370.9 36.31 HSA 6/13/2017 6/14/2017 48 6.39 29.92 - - - - 4 - - PVC 80 - - - - 36.5 46.5 0.02 1 36.5 2x12 35 48 31 35 2 31

SAM-10B 2201088.6 6075387.8 36.46 HSA 6/9/2017 6/12/2017 72 4.03 32.43 - - - - 4 - - PVC 80 - - - - 66.5 71.5 0.02 1 66.5 2x12 65 72 61 65 2 61

SAM-10C 2201059.0 6075362.1 36.28 HSA 6/7/2017 6/8/2017 83.5 3.63 32.65 - - - - 4 - - PVC 80 - - - - 77.5 82.5 0.02 1 77.5 2x12 76 83.5 72 76 2 72SAM-10D 2201078.6 6075379.4 36.45 Sonic 5/25/2017 5/31/2017 130 3.83 32.62 93 130 4 10, 50, 85, 93 PVC 80 91.5 96.5 86.5 91.5 0.02 1 86.5 2x12 85 93 81.5 85 2 81.5

SAM-11A 2202819.3 6076585.5 41.59 HSA 6/16/2017 6/19/2017 53.5 7.36 34.23 - - - - 4 - - PVC 80 - - - - 47.5 52.5 0.02 1 47.5 2x12 46.5 53.5 43.5 46.5 2 43.5

SAM-11B 2202827.6 6076575.5 41.49 HSA 6/14/2017 6/15/2017 86 7.05 34.44 73.5 86 4 - - PVC 80 - - - - 67.5 72.5 0.02 1 67.5 2x12 66 73.5 63 66 2 63

SAM-11C Not installed due to absence of saturated granular intervalSAM-11D 2202810.9 6076595.5 41.37(6) Sonic 5/31/2017 6/2/2017 130 6.51 34.86 102 130 4 10, 50, 89, 101 PVC 80 100 105 90 100 0.02 1 90 2x12 88 102 84 88 2 84

SAM-13A 2202345.9 6073041.1 38.98(6) HSA 6/22/2017 6/26/2017 69.5 8.86 30.12 54 69.5 4 - - PVC 80 - - - - 47 52 0.02 1 47 2x12 45 54 41 45 2 41

SAM-13B Not installed due to absence of a suitable saturated granular interval

SAM-13C 2202371.2 6073011.5 39.00(6) HSA 6/20/2017 6/22/2017 87.5 6.95 32.05 - - - - 4 - - PVC 80 - - - - 76.5 86.5 0.02 1 76.5 2x12 74.5 87.5 70.5 74.5 2 70.5SAM-13D 2202354.5 6073031.3 38.94(6) Sonic 6/12/2017 6/14/2017 120 6.28 32.66 104 120 4 10, 50, 90, 103 PVC 80 101.5 106.5 91.5 101.5 0.02 1 91.5 2x12 89.5 104 86 89.5 2 86

Notes:(1) Elevation based on North American Vertical Datum of 1988 (NAVD88) in feet above mean sea level (amsl). Elevations taken from "top metal plate" of well head assembly, unless otherwise noted.

(2) Bottom-of-borehole backfill material: 3/8-inch coated bentonite pellets.

(3) Transition seal material: 3/8-inch coated bentonite pellets.

(4) Sanitary seal material: Neat cement with 5% bentonite.(5) SAM-7X was destroyed by drilling out and backfilling with neat cement on July 27 & 28, 2017. (Information shown in italics represents prior-to-abandonment well details).

(6) Elevation = top of 4-inch PVC well casing (not top of metal plate assembly).

(7) Depths to groundwater gauged on March 3, 2018.

Note: All wells completed at surface inside traffic-rated, 12-inch diameter, cast aluminum EMCO vaults (PN A0721-112)

GroundwaterElevation(1)

(feet amsl)

Blank Casing Inteval(ft bgs)

Screen Slot Size

(in)

Centralizer Depths(ft bgs)

Screen Interval(ft bgs)

Sump Interval(ft bgs)Casing/Screen

Bottom-of-Borehole

Backfill(2) Interval(ft bgs)

Well Diameter

(in)

Depth to Water(7)

(feet btoc)

Filter Pack Interval(ft bgs)

Transition Seal(3)

Interval(ft bgs)

Sanitary Seal(4)

Interval(ft bgs)

Filter Pack GradationWell ID Drilling

Method

Borehole Depth(ft bgs)

Well Construction DatesNorthing(feet)

Easting(feet)

Elevation(1)

(feet amsl)

CA?

CA?

CA?

CA?

CA?

CA?

MacARTHUR BOULEVARDCOWAN

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COST

A M

ESA F

REEW

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REDHIL

L AV

E

McGAW AVENUE

ALTON PARKWAY

GILLE

TTE

AVE

MacARTHUR PL

ARM

STRONG A

VE

DEERE AVE

IRVINE

SANTA ANA

IRVINE

SANTA ANA

SAM-9A24.89

SAM-8A26.62

SAM-7A31.25

SAM-11A34.3

SAM-13A30.98

SAM-10A29.93

31

30

29

28

27

32

26

33

25

34

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid,IGN, IGP, swisstopo, and the GIS User Community

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EXPLANATION

CA? SAM MONITORING WELL LOCATION

GROUNDWATER ELEVATION IN FEET AMSL,MARCH 27, 2018

APPROXIMATE GROUNDWATER ELEVATIONCONTOUR IN FEET AMSL

GROUNDWATER FLOW DIRECTION

FIGURE 1A

GROUNDWATER ELEVATIONSSAM-#A WELL COMPLETIONS

MARCH 27, 2018

OCWD SBGWPPORANGE COUNTY, CALIFORNIA

0 600 1,200

FEET

28

26.22

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@A?


ÃÅ55

COST

A M

ESA F

REEW

AY

REDHIL

L AV

E

McGAW AVENUE

ALTON PARKWAY

GILLE

TTE

AVE

MacARTHUR PL

ARM

STRONG A

VE

DEERE AVE

IRVINE

SANTA ANA

IRVINE

SANTA ANA

SAM-7B31.4

SAM-9B26.36

SAM-10B32.06

31

30

29

28

32

27


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EXPLANATION





FIGURE 1B

GROUNDWATER ELEVATIONSSAM-#B WELL COMPLETIONS

MARCH 27, 2018


0 600 1,200

FEET

28

26.22

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@A?

@A?

@A?

@A?

@A?


ÃÅ55

COST

A M

ESA F

REEW

AY

REDHIL

L AV

E

McGAW AVENUE

ALTON PARKWAY

GILLE

TTE

AVE

MacARTHUR PL

ARM

STRONG A

VE

DEERE AVE

IRVINE

SANTA ANA

IRVINE

SANTA ANA

SAM-9C28.04

SAM-8C29.77

SAM-7C32.12

SAM-13C32.11

SAM-11C34.48

SAM-10C32.65

32

31

30

33

29

34


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EXPLANATION





FIGURE 1C

GROUNDWATER ELEVATIONSSAM-#C WELL COMPLETIONS

MARCH 27, 2018


0 600 1,200

FEET

28

26.22

@A?

@A?

@A?

@A?

@A?

@A?


ÃÅ55

COST

A M

ESA F

REEW

AY

REDHIL

L AV

E

McGAW AVENUE

ALTON PARKWAY

GILLE

TTE

AVE

MacARTHUR PL

ARM

STRONG A

VE

DEERE AVE

IRVINE

SANTA ANA

IRVINE

SANTA ANA

32

31

30

33

34

29

SAM-9D28.62

SAM-8D29.77

SAM-7D32.04

SAM-13D32.67

SAM-11D34.87

SAM-10D32.71


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EXPLANATION





FIGURE 1D

GROUNDWATER ELEVATIONSSAM-#D WELL COMPLETIONS

MARCH 27, 2018


0 600 1,200

FEET

28

26.22

10

55

405

55

55

10

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

100

1010

1

11

1

1

1

10010

10

1100

1

Date: 2/2/2015

0 1,500

Sc ale: Feet

SBGPPTrichloroethene in Groundwater

0 - 35 FDI

Oran ge Cou n ty Water Dis tric t

405

55

Projec t #: 002-01 Figure 8.1a

TCE Con c en tration (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

Tric hloroethen e Is oc on tou r Lin e(0 - 35 FDI)Sou rc e SiteParc el Bou n daryStu dy Area

NOTES:See Appen dix I for addition al detail.FDI = Foot depth in terval below grou n d s u rfac e

55

405

55

5

55

10

1 10

1

10100

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

100

1000

1

1

10

100

100

1000

10

1100

1

Date: 2/3/2015

0 1,000

Sc ale: Feet


35 - 55 FDI


Projec t #: 002-01 Figure 8.1b

TCE Con c en tration (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

Tric hloroethen e Is oc on tou r Lin e(35 - 55 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

5

55

1

10

1

S FL

OW

ER S

T

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S ST

AN

DA

RD

AV

HARV

ARD

AV

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HIL

L AV

MAIN ST

S M

AIN

ST

E EDINGER AV

ALTON PKWY

JAMBOREE R

D

S G

RA

ND

AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

100

1000

100

100

1

1

10

100

1

Date: 2/3/2015

0 1,500

Scale: Feet


55 - 75 FDI

Orange County Water Dis trict

405

55

Project #: 002-01 Figure 8.1c

TCE Concentration (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

Trichloroethene Is ocontour Line(55 - 75 FDI)Source SiteParcel BoundaryStudy Area

NOTES:See Ap p endix I for additional detail.FDI = Foot dep th interval b elow ground s urface

55

405

55

5

55

110

101

1

1

10

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1010

01

1

1

100

1

101

1

100

Date: 2/3/2015

0 1,500

Sc ale: Feet

SBGPPTetrachloroethene in Groundwater

0 - 35 FDI


405

55

Projec t #: 002-01 Figure 8.2a

PCE Con c en tration (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

Tetrac hloroethen e Is oc on tou r Lin e(0 - 35 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

5

55

1

10101

10

1

101S F

LOW

ER S

T

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

100

1

10

100

1

10

1

10

1

1

1

1

100

100

1

1

10

Date: 2/3/2015

0 1,500

Sc ale: Feet


35 - 55 FDI


405

55

Projec t #: 002-01 Figure 8.2b

PCE Con c en tration (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

Tetrac hloroethen e Is oc on tou r Lin e(35 - 55 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

5

55

10

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1010

0

10

1

1

100

101

1

11

Date: 2/3/2015

0 1,500

Scale: Feet


55 - 75 FDI

Orange County Water Dis trict

55

Project #: 002-01 Figure 8.2c

PCE Concentration (µg/L)≥ 10010 - 1001 - 10

Tetrachloroethene Is ocontour Line(55 - 75 FDI)SourceParcel BoundaryStudy Area

NOTES:See Ap p endix I for additional detail.FDI = Foot dep th interval b elow ground s urface

55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

1

10

10

1

1

1

1

1

1

1

1

1

1

1

1

100

10

10

1

Date : 2/3/2015

0 1,500

Scale : Fe e t

SBGPP1,1-Dichloroethene in Groundwater

0 - 35 FDI

Clie n t Name

405

55

Pro je ct #: 002-01 Figure 8.3a

1,1-DCE Co n ce n tratio n (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

1,1-Dichlo ro e the n e Is o co n to u r Lin e(0 - 35 FDI)So u rce SiteParce l Bo u n daryStu dy Are a

NOTES:Se e Appe n dix I fo r additio n al de tail.FDI = Fo o t de pth in te rv al be lo w gro u n d s u rface

55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

W MCFADDEN ST

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

1001

10

10

10

100

11

1

1

10

1

100

10

10

10

1

Date: 2/3/2015

0 1,500

Scale: Feet


35 - 55 FDI

Oran ge Co u n ty Water Dis trict

Pro ject #: 002-01 Figure 8.3b

1,1-DCE Co n cen tratio n (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

1,1-Dichlo ro ethen e Is o co n to u r Lin e(35 - 55 FDI)So u rce SiteParcel Bo u n d aryStu d y Area

NOTES:See Appen d ix I fo r ad d itio n al d etail.FDI = Fo o t d epth in terv al belo w gro u n d s u rface

55

405

55

5

55

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

10010

0

11

10

10

1

10

10

1

Date: 2/3/2015

0 1,500

Sc ale: Feet


55 - 75 FDI


Projec t #: 002-01 Figure 8.3c

1,1-DCE Con c en tration (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

1,1-Dic hloroethen e Is oc on tou r Lin e(55 - 75 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

10

10

1

1

1

1

1

1

10

1

1

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPP1,4-Dioxane in Groundwater 0 - 35 FDI


Pro ject #: 002-01 Figure 8.4a

1,4-Dio xan e Co n cen tratio n (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

1,4-Dio xan e Is o co n to u r Lin e(0 - 35 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

100

10

1

10

1

1

10

1

1010

10

1

Date: 2/3/2015

0 1,500

Scale: Feet




1,4-Dio xan e Co n cen tratio n (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

1,4-Dio xan e Is o co n to u r Lin e(35 - 55 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

100

10

1

1

10

10

10

1

10

Date: 2/3/2015

0 1,500

Sc ale: Feet




1,4-Dioxan e Con c en tration (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

1,4-Dioxan e Is oc on tou r Lin e(55 - 75 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

2

1010

0

2

2

2

2

10

2

2

2

Date : 2/3/2015

0 1,500

Scale : Fe e t

SBGPPPerchlorate in Groundwater 0 - 35 FDI

Orange Co u nty Wate r District


Pe rchlo rate Co nce ntratio n (µg/L)≥ 1,000100 - 1,00010 - 1002 - 10

Pe rchlo rate Iso co nto u r Line(0 - 35 FDI)So u rce SiteParce l Bo u ndaryStu dy Are a

NOTES:Se e Ap p e ndix I fo r additio nal de tail.FDI = Fo o t de p th inte rv al be lo w gro u nd su rface

55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

2

1010

0

2

2

2

2

2

2

10

Date : 2/3/2015

0 1,500

Scale : Fe e t



Pro je ct #: 002-01 Figure 8.5b

Pe rchlo rate Co nce ntratio n (µg/L)≥ 1,000100 - 1,00010 - 1002 - 10

Pe rchlo rate Iso co nto u r Line(35 - 55 FDI)So u rce SiteParce l Bo u ndaryStu dy Are a


55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

2

10

2

2

2

2

Date: 2/3/2015

0 1,500

Scale: Feet



Pro ject #: 002-01 Figure 8.5c

Perchlo rate Co n cen tratio n (µg/L)≥ 102 - 10

Perchlo rate Is o co n to u r Lin e(55 - 75 FDI)So u rce SiteParcel Bo u n d aryStu d y Area

NOTE:See Appen d ix I fo r ad d itio n al d etail.FDI = Fo o t d epth in terv al belo w gro u n d s u rface

55

405

55

55

1

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPPHexavalent Chromium in Groundwater

0 - 35 FDI

Oran ge Cou n ty Water Dis trict

Project #: 002-01 Figure 8.6a

Chrom iu m VI Con cen tration (µg/L)≥ 10,0001,000 - 10,000

100 - 1,00010 - 1001 - 10

Chrom iu m VI Is ocon tou r Lin e(0 - 35 FDI)Sou rce SiteParcel Bou n d aryStu d y Area

NOTES:See Appen d ix I for ad d ition al d etail.FDI = Foot d epth in terval below grou n d s u rface

55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1100

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPPHexavalent Chromium in Groundwater

35 - 55 FDI

Oran ge Cou n ty Water Dis trict

Project #: 002-01 Figure 8.6b

Chrom iu m VI Con cen tration (µg/L)≥ 10010 - 1001 - 10

Chrom iu m VI Is ocon tou r Lin e(35 - 55 FDI)Sou rce SiteParcel Bou n d aryStu d y Area

NOTES:See Appen d ix I for ad d ition al d etail.FDI = Foot d epth in terval below grou n d s u rface

55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

11

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPPFreon 11 in Groundwater 0 - 35 FDI



Freo n 11 Co n cen tratio n (µg/L)≥ 1

Freo n 11 Is o co n to u r Lin e(Zo n e A1)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t




Fre o n 11 Co nce ntratio n (µg/L)≥ 101 - 10

Fre o n 11 Iso co nto u r Line(35 - 55 FDI)So u rce SiteParce l Bo u ndaryStu dy Are a


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

1

Date: 2/3/2015

0 1,500

Scale: Feet




Freo n 11 Co n cen tratio n (µg/L)≥ 101 - 10

Freo n 11 Is o co n to u r Lin e(55 - 75 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

100

1

1

1

1

1

100

Date : 2/3/2015

0 1,500

Scale : Fe e t




Fre o n 113 Co nce ntratio n (µg/L)≥ 10010 - 1001 - 10



55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

100

10

1

10

1

1

100

10

Date : 2/3/2015

0 1,500

Scale : Fe e t




Fre o n 113 Co nce ntratio n (µg/L)≥ 10010 - 1001 - 10


NOTE:Se e Ap p e ndix I fo r additio nal de tail.FDI = Fo o t de p th inte rv al be lo w gro u nd su rface

55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

10

10

1

1

Date: 2/3/2015

0 1,500

Scale: Feet




Freo n 113 Co n cen tratio n (µg/L)≥ 10010 - 1001 - 10


NOTE:See Appen d ix I fo r ad d itio n al d etail.FDI = Fo o t d epth in terv al belo w gro u n d s u rface

55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t




Fre o n 123 Co nce ntratio n (µg/L)≥ 101 - 10



55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10 1

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPP

Freon 123 in Groundwater 35 - 55 FDI

Orange County Water District

Project #: 002-01 Figure 8.9b

Contour

1

10

Freon 123 Isocontour Line(35 - 55 FDI)

Source Site

Parcel Boundary

Study Area

NOTES:See Appendix I for additional detail.FDI = Foot depth interval below ground surface

55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

1

Date: 2/3/2015

0 1,500

Scale: Feet




Freo n 123 Co n cen tratio n (µg/L)≥ 1



55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

100

1

1

1

Date: 2/3/2015

0 1,500

Scale: Feet

SBGPPVinyl Chloride in Groundwater

0 - 35 FDI



Vin yl Chlo rid e Co n cen tratio n (µg/L)≥ 10010 - 1001 - 10

Vin yl Chlo rid e Is o co n to u r Lin e(0 - 35 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

1

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

1001

1

Date: 2/3/2015

0 1,500

Scale: Feet


35 - 55 FDI



Vin yl Chlo rid e Co n cen tratio n (µg/L)≥ 10010 - 1001 - 10

Vin yl Chlo rid e Is o co n to u r Lin e(35 - 55 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

1

1

1

1

Date: 2/3/2015

0 1,500

Sc ale: Feet


55 - 75 FDI



Vin yl Chloride Con c en tration (µg/L)≥ 10010 - 1001 - 10

Vin yl Chloride Is oc on tou r Lin e(55 - 75 FDI)Sou rc e SiteParc el Bou n daryStu dy Area


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

10

1

1

1

1

1

1

1

1

1

1

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t

SBGPP1,1-Dichloroethane in Groundwater

0 - 35 FDI



1,1-DCA Co nce ntratio n (µg/L)≥ 1,000100 - 1,00010 - 1001 - 10

1,1-Dichlo ro e thane Iso co nto u r Line(0 - 35 FDI)So u rce SiteParce l Bo u ndaryStu dy Are a


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

110

1

1

10 1

10

1

1

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t


35 - 55 FDI



1,1-DCA Co nce ntratio n (µg/L)≥ 10010 - 1001 - 10



55

405

55

5

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1 1

1

1

Date: 2/3/2015

0 1,500

Scale: Feet


55 - 75 FDI



1,1-DCA Co n cen tratio n (µg/L)≥ 10010 - 1001 - 10

1,1-Dichlo ro ethan e Is o co n to u r Lin e(55 - 75 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

10

1

1

10

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t


0 - 35 FDI






55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

101

11

1

1

Date : 2/3/2015

0 1,500

Scale : Fe e t


35 - 55 FDI






55

405

55

55

S FLO

WER

ST

E DYER RD

E MCFADDEN AV

VON KARMAN AV

S STA

NDAR

D AV

HARV

ARD A

V

W DYER RD

W MCFADDEN AV

SUNFLOWER AV

VALENCIA AV

E PAULARINO AV

RED HILL

AV

MAIN ST

S MAI

N ST

E EDINGER AV

ALTON PKWY

JAMBOREE RD

S GRA

ND AV

BARRANCA PKWY

W EDINGER AV

W WARNER AV

MICHELSON DR

W MACARTHUR BLVD

NEWPORT AV

1

1

101

Date: 2/3/2015

0 1,500

Scale: Feet


55 - 75 FDI



1,2-DCA Co n cen tratio n (µg/L)≥ 101 - 10

1,2-Dichlo ro ethan e Is o co n to u r Lin e(55 - 75 FDI)So u rce SiteParcel Bo u n d aryStu d y Area


405

55

RED HILL AV

SUNFLOWER AV

VON KARMAN AV

RED HILL AV

MAIN ST

S MAI

N ST

E EDINGER AV

E WARNER AV

S GRA

ND AV

MACA

RTHU

R BLV

D

ALTON PKWY

E DYER RD

W WARNER AV

W MACARTHUR BLVD

BARRANCA PKWY

FLOW

ER ST

Holc h em /S erv ic eCh em ic al

DieselLog istic s

Dic eonElec tronic s

Extrud edPlastic s

Gallad eCh em ic al

GriffinElec tronic s

Eng ineeringPlating

Rh eemMetals

BellInd ustries

Univ ersalCirc uits

West CoastPlating

Troy Com puter(Data Card )

PDAEng ineering

GE Plastic s

TDKEng ineering

Mitc h elRubber Co.

Roc kfordAerospac eProd uc ts

Unisys/Mem orex

DrakeEng ineering

Ric ohElec tronic s

Alum inumForg e (Div ision

of Altam il)

US Polym etric

Mic rom otors(Prod ex)

City CenterInd ustrial

Park

GriswoldControls,

Inc .

Arc o Weld ingManufac turing

TextronFastening

S ystem s Aero

Com m erc ialCh em

Orang e CoastPlating (NiponEng ines S pec )

ColonialEng ineering

Ind ustrialBuild ing

Transm issionMasters

PC World

Allen T.Cam pbell

Trust

Em beePlating

Circ uitOne

Ing ramMic ro

S teelc aseInc orporated

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BFMEnerg yProd

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ITTCannon

US CODistribution

S erv ic es

Form erS anta AnaCity Yard

MobilCh em ic al

BAS F

Kug elTrustProp

Date: 7/22/2014

0 1,250

S c ale: FeetS outh Basin Ground water Protec tion Projec t

Fig ure 1

LO C AT I ON M A P

S ourc es: Esri, US GS , NOAA

PacificOcean

10

5

15215

405

AreaLoc ation

Los Angeles Co.

Orange Co.Riverside Co.

San Diego Co.

Legend

55

91

S ourc es: US GS , ES RI, TANA, AND

(Contam inant c onc entration for one or m ore of:TCE, PCE, 1,1-DCE, 1,4-Dioxane, Perc h lorate,Hexav alent Ch rom ium , Freon-11, Freon-113,Freon-123, Vinyl Ch lorid e, 1,1-DCA, 1,2-DCA )

Contamination inShallow Aquifer System

Contam inant Plum e Extent 1,000 - 10,000 parts per billionContam inant Plum e Extent 100 - 1,000 parts per billionContam inant Plum e Extent 10 - 100 parts per billionContam inant Plum e Extent 1 - 10 parts per billion

Contam inant Plum e Extent ≥ 10,000 parts per billion

Brandon

Text Box

Figure 8.13

Brandon

Rectangle

orange county water district south basin # d-1712505 remedial … · 2018. 6. 28. · beneficial...

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