b&l woodwaste compliance monitoring plan addendum

Two Union Square 601 Union Street, Suite 600

Seattle, WA 98101 tel: 206.292.2078 fax: 206.682.7867

\\dcone\data\projects\B&L O&M\1507 Compliance Monitoring and Maintenance\01 Compliance Monitoring Plan Addendum\01 Text\CMP Addendum 2017_1019.docx

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Memorandum

To: Mohsen Kourehdar, Washington State Department of Ecology

Copies: Dan Silver, B&L Woodwaste Custodial Trust

From: Brett Beaulieu

Date: October 19, 2017

Project No: B&L O&M 1507

Re: B&L Woodwaste Compliance Monitoring Plan Addendum

This memorandum serves as an addendum to the Compliance Monitoring Plan (CMP) for the B&L Woodwaste Site, which was submitted as Appendix B of the B&L Woodwaste Site Operations, Maintenance, and Monitoring Plan (Floyd|Snider/AMEC 2013a). The monitoring program described in the CMP is intended to support long-term compliance monitoring following implementation of remedy specified in the 2008 Cleanup Action Plan (CAP). The goal of this memorandum is to update the groundwater monitoring program for current conditions at the B&L Woodwaste Site.

In particular, there have been two changes to the remediation program effective September 2017, that affect the data needs of the monitoring program. These are the shutdown of the groundwater recovery and treatment program and the in situ treatment of the Agricultural Field Plume and an area of the Wetlands Plume near PD-141 (refer to Figure 1). The corresponding changes to the groundwater monitoring program include:

1. Increasing the frequency to quarterly and sampling additional wells in the vicinity of the southwest corner, the area with the greatest potential for leachate to migrate beyond the barrier in the absence of hydraulic containment.

2. Increasing the frequency to quarterly and sampling additional wells in the agricultural field in situ treatment area, which is downgradient of the southwest corner.

3. Changing the semiannual spring event from a site-wide event to a more limited event focused on the southwest corner, the in situ treatment areas, and monitoring wells that may indicate potential arsenic rebound in the wetlands plume. Site-wide sampling, including surface water monitoring, monitoring of the landfill property, and monitoring of the lower aquifer away from the aquitard gaps, is reserved for the annual fall monitoring event.

Mr. Mohsen Kourehdar October 19, 2017


B&L Woodwaste Compliance Monitoring Plan Addendum

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The specific monitoring wells to be sampled are summarized in the following table.

Event/Timing Monitoring Wells and Surface Water

Sampling Locations Data Objectives

Quarterly: January and July

Upper Aquifer: D-8A, PD-214, PZ-3A, PZ-4A, PZ-5A, MW-33, MW-34, R-15, W-1 Lower Aquifer: MW-40B, D-8B

Monitor for leachate in southwest corner and downgradient of southwest corner. Monitor agricultural field remediation performance.

Semiannual: April

Upper Aquifer: D-8A, PD-214, PZ-3A, PZ-4A, PZ-5A, MW-33, MW-34, R-15, W-1, D-5U, D-7A, MW-13, MW-15, PD-141 Lower Aquifer: MW-40B, D-8B

Monitor for potential wetlands plume rebound.

Annual: October

Upper Aquifer: D-8A, PD-214, PZ-3A, PZ-4A, PZ-5A, MW-33, MW-34, R-15, W-1, D-5U, D-7A, MW-13, MW-15, PD-141, D-6A, D-9A, D-10A, MW-30, MW-31A, MW-35 Lower Aquifer: MW-40B, D-8B, D-5L, D-6B, D-7B Surface Water: SW-2, SW-3, SW-5

Monitor site-wide conditions, including throughout wetlands plume, on landfill property, lower aquifer, and surface water.

OTHER COMPLIANCE MONITORING PLAN CHANGES

Compliance monitoring will be conducted in accordance with the procedures described in the CMP, except where noted.

Water Level Measurements

Water level measurements, previously collected from monitoring wells and piezometers located throughout a broad area surrounding the landfill, will instead be collected from the monitoring wells sampled during each event. Manual water level measurements will also be collected annually from landfill perimeter piezometers, to validate pressure transducer measurements.

Purge Water Disposal

Purge water from compliance monitoring wells generated during sampling will be collected in containers, transported to the secure area at the groundwater treatment plant, and transferred to a U.S. Department of Transportation-approved 55-gallon container. Purge water will be stored onsite until transported and disposed of off-site at an appropriate facility.

Mr. Mohsen Kourehdar October 19, 2017


B&L Woodwaste Compliance Monitoring Plan Addendum

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Reporting

Compliance monitoring reports will consist of the following:

• Quarterly Reports: Groundwater arsenic results table, analytical laboratory reports.

• Semiannual Reports: Groundwater arsenic results table, groundwater arsenic results figure, analytical laboratory reports.

• Annual Reports: Groundwater elevations and head difference table, groundwater arsenic results table, surface water arsenic results table, groundwater and surface water arsenic results figure, upper aquifer potentiometric contours, lower aquifer potentiometric contours, time concentration plots, analytical laboratory reports.

LIST OF ATTACHMENTS

Figure 1 Compliance Monitoring Locations

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Hyleb o sCreek

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SurpriseLa keDra in

Dra ina geDitc h

So uthwest Aquita rdGa p (Appro x.)

Ba rrier W a ll

Ea stern Aquita rdGa p (Appro x.)

Gro und wa terTrea tm ent Pla nt

B&L Woodwaste Landfill

M W -31B

D-7B

D-8B

PD-201

PD-202

PD-65

PD-203

PD-204PD-101M W -31A

PD-6

M W -16M W -17

PD-1B

D-1U

D-1L

D-5UD-5L

D-6A D-6B

M W -13

M W -14

M W -15PD-51

M W -32

PD-140 PD-141

PD-142

M W -35

M W -36

M W -33

M W -34

M W -30

PD-212

W -1

W -3(M W -18) R-11

R-5R-3

R-4

R-6

R-1

R-2

R-7

R-8

R-9

R-10

PZ-7APZ-7B

PZ-8APZ-8BPZ-8C

PZ-1APZ-1B

PZ-2APZ-2B

PZ-3A PZ-3B

PZ-4APZ-4C

PZ-5APZ-5BPZ-5C

PZ-6APZ-6B

D-7A

D-8A

PD-214

PD-215D-9A

D-11AD-11B

PD-60

PD-61

PD-63B

PD-64

PD-38

D-10A

PD-216

PD-213

SW -2

SW -3

SW -5

R-12

R-13R-14R-15

R-16

R-17

R-18R-19

R-20

R-21

No rthPo nd

W estPo nd

M W -40B

R-23

R-22

PD-121

PD-63C

PD-210

PD-211PD-211TD

PD-200

PD-209APD-209B

GW -1

GW -2

PD-70

PD-71

PD-120PD-122

PD-130 PD-131PD-132

PD-105 PD-106

PD-4PD-1APD-1C

PD-50

PD-52APD-52BPD-52C

W -2

PD-109PZ-12

PZ-4B

SUM P

PD-63APD-40

M W -23

PD-80PD-81PD-82

PD-103

,

Agricultural FieldPlume

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Wetlands Plume

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Figure 1Co m plia nc e M o nito ring Lo c a tio ns

Compliance MonitoringPlan Addendum

B&L Woodwaste SitePierce County, Washington

Legend&< Upper Sa nd Aquifer M o nito ring Lo c a tio n&< Lo wer Sa nd Aquifer M o nito ring Lo c a tio n

Co m plia nc e Surfa c e W a ter M o nito ring Lo c a tio n&< M o nito ring W ell o r Piezo m eter&? Rec o very W ell Lo c a tio n#0 Po nd Sta ff Ga ge Lo c a tio n

Co nd itio na l Po int o f Co m plia nc e(Ba rrier W a ll)Pro perty Bo und a ry fro m Ta x Pa rc el Da taSto rm wa ter Po ndSurfa c e Dra ina ge Fea tureAquita rd Ga ps

Pa th: I:\GIS\Pro jects\B&L-O&M \M X D\Co m plia nc e M o nito ring Pla n Ad d end um \Figure 1 Co m plia nc e M o nito ring Lo c a tio ns.m xdDa te: 10/19/2017

1 inc h = 300 feet

5–100101–200201–300301–400401–500

501–600601–700701–800801–900901–1,000

0 300 600

Sc a le in Feet

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Inferred Arsenic Co nc entra tio n, Upper Sa nd Aquifer in µg/L (October 2016)

No tes: · Ortho im a ge pro vid ed b y USGS a nd d a ted June–July 2005. · Hyleb o s Creek a nd o ther surfa c e d ra ina ge fea ture lo c a tio ns sho wn were d igitized fro m the 2005 o rtho im a ge c ited a b o ve. · Bla c k a nd white repro d uc tio n o f this c o lo r figure m a y a ffect interpreta tio n o f the results.Ab b revia tio n: µg/L = M ic ro gra m s per liter

PD-216SW -5

D-7B

W -1

R-10W estPo nd

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b&l woodwaste compliance monitoring plan addendum

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