* * * * * * * November 1, Pierce County Parks and Recreation Services Department 9112 Lakewood Drive SW Lakewood, WA 98499

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Willis Pierce
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1 November, 0 Pierce County Parks and Recreation Services epartment Lakewood rive SW Lakewood, WA Attn: Jessica Stone, Natural Lands Steward Transmitted via to: jstone@co.pierce.wa.us Re: 0 Groundwater Monitoring Results Lake Tapps County Park Underground Storage Tank Site Sumner, Washington Project No ear Jessica: Landau Associates, Inc. (LAI) completed groundwater monitoring activities at the Lake Tapps County Park Underground Storage Tanks (UST) site (site) on September, 0. The site is located at th Avenue East in Sumner, Washington and is shown on Figure. Three monitoring wells were installed in association with a petroleum hydrocarbon release from two historical USTs. The tanks were installed for a small fuel dispensing station to service recreational watercraft. The USTs were decommissioned in ; the three monitoring wells were subsequently installed in. Three monitoring wells (MW-, MW-, and MW-) were sampled for gasoline-range organics (GRO) and benzene, toluene, ethylbenzene, and xylenes (BTEX). The locations of the monitoring wells are shown on Figure. Samples were collected from the top of the screened interval, to be consistent with historical sampling techniques. Most recent groundwater monitoring results, as well as September 0 results are presented in Table. The most recent laboratory data package is included as Attachment. These data are considered final and have undergone quality assurance review. Results were compared to Model Toxics Control Act (MTCA) Method A cleanup levels (CULs) for unrestricted land use on Table. uring the September 0 monitoring event, concentrations of GRO and BTEX were not detected above laboratory reporting limits at either MW- or MW-. However, GRO was detected above the CUL at MW- ( milligrams per liter [mg/l]) as well as benzene, ethylbenzene, and total xylenes ( micrograms per liter [µg/l], 00 µg/l, and µg/l, respectively). Analytical results for all three groundwater wells are consistent with 0 results. Groundwater sampling is scheduled to be conducted again in summer 0. * * * * * * * South C Street Tacoma, Washington 0 () -

$Sierra Mott Project Scientist SMM/jrc [Y:\\00.00\R\SUMMARY LETTER_0\LAKETAPPSGW_LETTER.$

2 0 Groundwater Monitoring Results Landau Associates If you have any questions concerning the results, please call me at () -. LANAU ASSOCIATES, INC. Sierra Mott Project Scientist SMM/jrc [Y:\\00.00\R\SUMMARY LETTER_0\LAKETAPPSGW_LETTER.OCX] Attachments: Figure : Vicinity Map Figure : Site Plan Table : Groundwater Monitoring Results Attachment : Laboratory ata Package November, 0

$Lake Tapps Th Ave E Crawford Lake S Tapps r E Th Ave 0T h S t E E G:\Projects\\00\0\0\F0VicMap.mxd //0 0 0.$

3 Kers ey Way ST SE Nd Ave E Creek Bowman White R i ver Th S t E Sum n er Tapp s H wy T h S t E T h S t E Lake Tapps North Park Project Location Th Ave E! Lake Tapps Th Ave E Crawford Lake S Tapps r E Th Ave 0T h S t E E G:\Projects\\00\0\0\F0VicMap.mxd // Miles ata Source: Esri 0 Lake Tapps County Park Groundwater Monitoring Sumner, Washington Vicinity Map! Everett! Seattle Tacoma Sumner!!! Olympia Project Location! Spokane W a s h i n g t o n Figure

4 ! MW- MW-!! MW- G:\Projects\\00\0\0\F0 Site Plan.mxd //0 Legend! Monitoring Well ata Source: Esri World Imagery, Stemen Environmental Inc. Lake Tapps County Park Groundwater Monitoring Sumner, Washington 0 0 Scale in Feet Note. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. Site Plan Figure

5 BTEX (µg/l; EPA ) Table Groundwater Monitoring Results Lake Tapps County Park Underground Storage Tank Site Sumner, Washington Location I, Laboratory SG, and Sample ate Benzene.0.0 U.0 U.0 U.0 U Toluene 00.0 U.0 U.0 U.0 U Ethylbenzene 00.0 U.0 U U.0 U m-xylene & p-xylene N/A.0 U.0 U U.0 U o-xylene N/A.0 U.0 U.0 U.0 U Total Xylenes 00 N N N N Petroleum Hydrocarbons (mg/l; NWTPH-Gx) Gasoline-range organics U 0. U J 0.00 U 0. U Notes: Bold = detected compound Green Box = The detected concentration is greater than preliminary cleanup level. J = The result is an estimated quantity. The associated numerical value is the approximate concentration of the analyte in the sample. U = The compound was not detected at the reported concentration. (a) Cleanup level for gasoline based on presence of benzene; in the absence of benzene the cleanup level is.0 mg/l. Table Page of MTCA MW- MW- MW- MW- MW- MW- Method A Cleanup Level (a) //0 //0 //0 //0 //0 //0 Abbreviations and Acronyms: BTEX = benzene, toluene, ethylbenzene, and xylene EPA = US Environmental Protection Agency I = identification µg/l = micrograms per liter mg/l = milligrams per liter N/A = not applicable MTCA = Model Toxics Control Act NWTPH-Gx = Method Northwest gasoline-range total petroleum hydrocarbon extended SG = sample delivery group //0Y:\\00.00\R\Summary Letter_0\T0 GW Results Landau Associates

6 Attachment Laboratory ata Package

com The test results in this report meet all 00 NELAC and 00 TNI requirements for accredited parameters, exceptions are noted in this report.

7 ANALYTICAL REPORT TestAmerica Laboratories, Inc. th Street East Tacoma, WA Tel: ()- TestAmerica Job I: 0-0- Client For: Landau & Associates, Inc. South C Street Tacoma, Washington 0 Attn: Sierra Mott Authorized for release by: //0 :00: PM Sheri Cruz, Project Manager I ()- sheri.cruz@testamericainc.com The test results in this report meet all 00 NELAC and 00 TNI requirements for accredited parameters, exceptions are noted in this report. This report may not be reproduced except in full, and with written approval from the laboratory. For questions please contact the Project Manager at the address or telephone number listed on this page. This report has been electronically signed and authorized by the signatory. Electronic signature is intended to be the legally binding equivalent of a traditionally handwritten signature. Results relate only to the items tested and the sample(s) as received by the laboratory.

8 Client: Landau & Associates, Inc. Table of Contents TestAmerica Job I: 0-0- Cover Page Table of Contents Case Narrative efinitions Sample Summary Chain of Custody Receipt Checklists Client Sample Results QC Sample Results Chronicle Certification Summary Page of //0

9 Case Narrative Client: Landau & Associates, Inc. TestAmerica Job I: 0-0- Job I: 0-0- Laboratory: Narrative Comments No additional comments. Job Narrative 0-0- Receipt The samples were received on //0 : AM; the samples arrived in good condition, properly preserved and, where required, on ice. The temperature of the cooler at receipt was.º C. GC/MS VOA Method(s) : The following sample was re-analyzed due to analyte carry over in the initial analysis.mw--00 (0-0-) Method(s) : The following sample was diluted to bring the concentration of target analytes within the calibration range: MW--00 (0-0-). Elevated reporting limits (s) are provided. Method(s) NWTPH-Gx: recovery for the following sample was outside control limits: MW--00 (0-0-). Evidence of matrix interference is present; therefore, re-extraction and/or re-analysis was not performed. No additional analytical or quality issues were noted, other than those described above or in the efinitions/glossary page. Page of //0

10 Client: Landau & Associates, Inc. efinitions/glossary TestAmerica Job I: 0-0- s GC VOA X Glossary Abbreviation escription is outside control limits These commonly used abbreviations may or may not be present in this report. Listed under the "" column to designate that the result is reported on a dry weight basis %R Percent Recovery CFL Contains Free Liquid CNF Contains No Free Liquid ER uplicate Error Ratio (normalized absolute difference) ilution Factor L etection Limit (o/oe) L, RA, RE, IN Indicates a ilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample LC ecision Level Concentration (Radiochemistry) EL Estimated etection Limit (ioxin) LO Limit of etection (o/oe) LOQ Limit of Quantitation (o/oe) MA Minimum etectable Activity (Radiochemistry) MC Minimum etectable Concentration (Radiochemistry) ML Method etection Limit ML Minimum Level (ioxin) NC Not Calculated N Not etected at the reporting limit (or ML or EL if shown) PQL Practical Quantitation Limit QC Quality Control RER Relative Error Ratio (Radiochemistry) Reporting Limit or Requested Limit (Radiochemistry) RP Relative Percent ifference, a measure of the relative difference between two points TEF Toxicity Equivalent Factor (ioxin) TEQ Toxicity Equivalent Quotient (ioxin) Page of //0

11 Client: Landau & Associates, Inc. Sample Summary TestAmerica Job I: 0-0- Lab Sample I Client Sample I Matrix Collected Received 0-0- TripBlank-00 Water 0// 00:00 0// : 0-0- MW--00 Water 0// 0:0 0// : 0-0- MW--00 Water 0// :0 0// : 0-0- MW--00 Water 0// 0:0 0// : Page of //0

12 Page of //0

13 Login Sample Receipt Checklist Client: Landau & Associates, Inc. Job Number: 0-0- Login Number: 0 List Source: List Number: Creator: Ponce-Mcermott, Monica Question Answer Comment Radioactivity wasn't checked or is </= background as measured by a survey meter. The cooler's custody seal, if present, is intact. Sample custody seals, if present, are intact. The cooler or samples do not appear to have been compromised or tampered with. Samples were received on ice. Cooler Temperature is acceptable. Cooler Temperature is recorded. COC is present. COC is filled out in ink and legible. COC is filled out with all pertinent information. Is the Field Sampler's name present on COC? There are no discrepancies between the containers received and the COC. Samples are received within Holding Time (excluding tests with immediate HTs) Sample containers have legible labels. Containers are not broken or leaking. Sample collection date/times are provided. Appropriate sample containers are used. Sample bottles are completely filled. Sample Preservation Verified. There is sufficient vol. for all requested analyses, incl. any requested MS/MSs Containers requiring zero headspace have no headspace or bubble is <mm (/"). Multiphasic samples are not present. Samples do not require splitting or compositing. Residual Chlorine Checked. N/A N/A Page of //0

14 Client: Landau & Associates, Inc. Client Sample Results Method: - Volatile Organic Compounds (GC/MS) Client Sample I: TripBlank-00 ate Collected: 0// 00:00 ate Received: 0// : Result ML TestAmerica Job I: 0-0- Lab Sample I: 0-0- Benzene N.0 ug/l 0// : Toluene Ethylbenzene m-xylene & p-xylene o-xylene N N N N.0 ug/l 0// :.0 ug/l 0// :.0 ug/l 0// :.0 ug/l 0// : Trifluorotoluene (Surr) 0-0// : Toluene-d (Surr) - 0// : -Bromofluorobenzene (Surr) - 0// : ibromofluoromethane (Surr) 0-0// :,-ichloroethane-d (Surr) 0-0// : Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML Lab Sample I: 0-0- Benzene N.0 ug/l 0// : Toluene Ethylbenzene m-xylene & p-xylene o-xylene N N N N.0 ug/l 0// :.0 ug/l 0// :.0 ug/l 0// :.0 ug/l 0// : Trifluorotoluene (Surr) - 0// : Toluene-d (Surr) - 0// : -Bromofluorobenzene (Surr) - 0// : ibromofluoromethane (Surr) 0-0// :,-ichloroethane-d (Surr) 0-0// : Client Sample I: MW--00 ate Collected: 0// :0 ate Received: 0// : Result ML Lab Sample I: 0-0- Benzene.0 ug/l 0// : Toluene.0 ug/l 0// : o-xylene.0 ug/l 0// : Trifluorotoluene (Surr) - 0// : Toluene-d (Surr) - 0// : -Bromofluorobenzene (Surr) - 0// : ibromofluoromethane (Surr) 0-0// :,-ichloroethane-d (Surr) 0-0// : Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML Lab Sample I: 0-0- Benzene N.0 ug/l 0// 00:0 Toluene N.0 ug/l 0// 00:0 Page of //0

15 Client: Landau & Associates, Inc. Client Sample Results Method: - Volatile Organic Compounds (GC/MS) (Continued) Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML TestAmerica Job I: 0-0- Lab Sample I: 0-0- Ethylbenzene N.0 ug/l 0// 00:0 o-xylene N.0 ug/l 0// 00:0 Trifluorotoluene (Surr) - 0// 00:0 Toluene-d (Surr) - 0// 00:0 -Bromofluorobenzene (Surr) - 0// 00:0 ibromofluoromethane (Surr) 0-0// 00:0,-ichloroethane-d (Surr) 0-0// 00:0 Page of //0

16 Client: Landau & Associates, Inc. Client Sample Results Method: - Volatile Organic Compounds (GC/MS) - L Client Sample I: MW--00 ate Collected: 0// :0 ate Received: 0// : Result ML TestAmerica Job I: 0-0- Lab Sample I: 0-0- Ethylbenzene ug/l 0// 0:0 0 m-xylene & p-xylene ug/l 0// 0:0 0 Trifluorotoluene (Surr) - 0// 0:0 0 Toluene-d (Surr) - 0// 0:0 0 -Bromofluorobenzene (Surr) - 0// 0:0 0 ibromofluoromethane (Surr) 0-0// 0:0 0,-ichloroethane-d (Surr) 0 0-0// 0:0 0 Page of //0

17 Client: Landau & Associates, Inc. Client Sample Results Method: - Volatile Organic Compounds (GC/MS) - RA Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML TestAmerica Job I: 0-0- Lab Sample I: 0-0- m-xylene & p-xylene N.0 ug/l 0// 0: Trifluorotoluene (Surr) - 0// 0: Toluene-d (Surr) - 0// 0: -Bromofluorobenzene (Surr) - 0// 0: ibromofluoromethane (Surr) 0-0// 0:,-ichloroethane-d (Surr) 0 0-0// 0: Page of //0

18 Client: Landau & Associates, Inc. Client Sample Results Method: NWTPH-Gx - Northwest - Volatile Petroleum Products (GC) Client Sample I: TripBlank-00 ate Collected: 0// 00:00 ate Received: 0// : Result ML TestAmerica Job I: 0-0- Lab Sample I: 0-0- Gasoline N 0. mg/l 0// 0: -Bromofluorobenzene (Surr) - 0// 0: Trifluorotoluene (Surr) - 0// 0: Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML Lab Sample I: 0-0- Gasoline N 0. mg/l 0// : -Bromofluorobenzene (Surr) - 0// : Trifluorotoluene (Surr) - 0// : Client Sample I: MW--00 ate Collected: 0// :0 ate Received: 0// : Result ML Lab Sample I: 0-0- Gasoline 0. mg/l 0// : -Bromofluorobenzene (Surr) X - 0// : Trifluorotoluene (Surr) - 0// : Client Sample I: MW--00 ate Collected: 0// 0:0 ate Received: 0// : Result ML Lab Sample I: 0-0- Gasoline N 0. mg/l 0// : -Bromofluorobenzene (Surr) - 0// : Trifluorotoluene (Surr) - 0// : Page of //0

19 Client: Landau & Associates, Inc. QC Sample Results Method: - Volatile Organic Compounds (GC/MS) Lab Sample I: MB 0-0/ Analysis : 0 MB MB Result ML TestAmerica Job I: 0-0- Client Sample I: Method Blank Prep Type: Total/NA Benzene N.0 ug/l 0// : Toluene Ethylbenzene m-xylene & p-xylene o-xylene N.0 ug/l 0// : N.0 ug/l 0// : N.0 ug/l 0// : N.0 ug/l 0// : MB MB Trifluorotoluene (Surr) 0-0// : Toluene-d (Surr) - 0// : -Bromofluorobenzene (Surr) - 0// : ibromofluoromethane (Surr) 0-0// :,-ichloroethane-d (Surr) 0-0// : Lab Sample I: LCS 0-0/ Analysis : 0 Spike Added LCS LCS Result Client Sample I: Lab Control Sample Prep Type: Total/NA Benzene.0. ug/l - Toluene.0. ug/l - Ethylbenzene.0. ug/l - m-xylene & p-xylene.0. ug/l 0 - o-xylene.0. ug/l 0 - LCS LCS Trifluorotoluene (Surr) - Toluene-d (Surr) - -Bromofluorobenzene (Surr) - ibromofluoromethane (Surr) 0 -,-ichloroethane-d (Surr) 0 - Lab Sample I: LCS 0-0/ Analysis : 0 Spike Added LCS LCS Result %Rec %Rec. Client Sample I: Lab Control Sample up Prep Type: Total/NA Benzene.0. ug/l Toluene.0. ug/l - 0 Ethylbenzene.0.0 ug/l 0-0 m-xylene & p-xylene.0. ug/l o-xylene.0. ug/l - 0 LCS LCS Trifluorotoluene (Surr) 0 - Toluene-d (Surr) - -Bromofluorobenzene (Surr) - ibromofluoromethane (Surr) 0 - %Rec %Rec. RP RP Limit Page of //0

20 Client: Landau & Associates, Inc. QC Sample Results Method: - Volatile Organic Compounds (GC/MS) (Continued) Lab Sample I: LCS 0-0/ Analysis : 0 LCS LCS,-ichloroethane-d (Surr) 0 - Lab Sample I: MB 0-0/ Analysis : 0 MB MB Result ML TestAmerica Job I: 0-0- Client Sample I: Lab Control Sample up Prep Type: Total/NA Client Sample I: Method Blank Prep Type: Total/NA Benzene N.0 ug/l 0// : Toluene Ethylbenzene m-xylene & p-xylene o-xylene N.0 ug/l 0// : N.0 ug/l 0// : N.0 ug/l 0// : N.0 ug/l 0// : MB MB Trifluorotoluene (Surr) - 0// : Toluene-d (Surr) 0-0// : -Bromofluorobenzene (Surr) - 0// : ibromofluoromethane (Surr) 0 0-0// :,-ichloroethane-d (Surr) 0-0// : Lab Sample I: LCS 0-0/ Analysis : 0 Spike Added LCS LCS Result Client Sample I: Lab Control Sample Prep Type: Total/NA Benzene.0. ug/l - Toluene.0. ug/l - Ethylbenzene.0. ug/l - m-xylene & p-xylene.0. ug/l - o-xylene.0. ug/l 0 - LCS LCS Trifluorotoluene (Surr) - Toluene-d (Surr) - -Bromofluorobenzene (Surr) 0 - ibromofluoromethane (Surr) 0 -,-ichloroethane-d (Surr) 0 - Lab Sample I: LCS 0-0/ Analysis : 0 Spike Added LCS LCS Result %Rec %Rec. Client Sample I: Lab Control Sample up Prep Type: Total/NA Benzene.0. ug/l Toluene.0. ug/l Ethylbenzene.0.0 ug/l 0-0 m-xylene & p-xylene.0. ug/l - 0 %Rec %Rec. RP RP Limit Page of //0

21 Client: Landau & Associates, Inc. QC Sample Results Method: - Volatile Organic Compounds (GC/MS) (Continued) Lab Sample I: LCS 0-0/ Analysis : 0 Spike Added LCS LCS Result TestAmerica Job I: 0-0- Client Sample I: Lab Control Sample up Prep Type: Total/NA o-xylene.0. ug/l - 0 LCS LCS Trifluorotoluene (Surr) - Toluene-d (Surr) 0 - -Bromofluorobenzene (Surr) - ibromofluoromethane (Surr) 0 -,-ichloroethane-d (Surr) 0 - Method: NWTPH-Gx - Northwest - Volatile Petroleum Products (GC) Lab Sample I: MB 0-/ Analysis : MB MB Result ML %Rec %Rec. RP RP Limit Client Sample I: Method Blank Prep Type: Total/NA Gasoline N 0. mg/l 0// : MB MB -Bromofluorobenzene (Surr) - 0// : Trifluorotoluene (Surr) - 0// : Lab Sample I: LCS 0-/ Analysis : Spike Added LCS LCS Result Client Sample I: Lab Control Sample Prep Type: Total/NA Gasoline mg/l 0-0 LCS LCS -Bromofluorobenzene (Surr) 0 - Trifluorotoluene (Surr) - Lab Sample I: LCS 0-/ Analysis : Spike Added LCS LCS Result %Rec %Rec. Client Sample I: Lab Control Sample up Prep Type: Total/NA Gasoline mg/l - 0 LCS LCS -Bromofluorobenzene (Surr) - Trifluorotoluene (Surr) - %Rec %Rec. RP RP Limit Page of //0

22 Lab Chronicle Client: Landau & Associates, Inc. TestAmerica Job I: 0-0- Client Sample I: TripBlank-00 Lab Sample I: 0-0- ate Collected: 0// 00:00 ate Received: 0// : Prep Type Total/NA Total/NA Type Method Run ilution Factor Number or Analyst Analysis 0 0// : TW TAL SEA Analysis NWTPH-Gx 0// 0: RSB TAL SEA Client Sample I: MW--00 Lab Sample I: 0-0- ate Collected: 0// 0:0 ate Received: 0// : Prep Type Total/NA Total/NA Type Method Run ilution Factor Number or Analyst Analysis 0 0// : TW TAL SEA Analysis NWTPH-Gx 0// : RSB TAL SEA Lab Lab Client Sample I: MW--00 Lab Sample I: 0-0- ate Collected: 0// :0 ate Received: 0// : Prep Type Total/NA Total/NA Total/NA Type Method Run ilution Factor Number or Analyst Analysis 0 0// : TW TAL SEA Analysis L 0 0 0// 0:0 IWH TAL SEA Analysis NWTPH-Gx 0// : RSB TAL SEA Lab Client Sample I: MW--00 Lab Sample I: 0-0- ate Collected: 0// 0:0 ate Received: 0// : Prep Type Total/NA Total/NA Total/NA Type Method Run ilution Factor Number or Analyst Analysis 0 0// 00:0 TW TAL SEA Analysis RA 0 0// 0: IWH TAL SEA Analysis NWTPH-Gx 0// : RSB TAL SEA Lab Laboratory References: TAL SEA =, th Street East, Tacoma, WA, TEL ()- Page of //0

23 Accreditation/Certification Summary Client: Landau & Associates, Inc. TestAmerica Job I: 0-0- Laboratory: Unless otherwise noted, all analytes for this laboratory were covered under each accreditation/certification below. Authority Program EPA Region Identification Number Expiration ate Washington State Program C 0-- Analysis Method Prep Method Matrix Page of //0

ANALYTICAL REPORT. Attn: Richard Boelter

ANALYTICAL REPORT. Attn: Richard Boelter ANALYTICAL REPORT TestAmerica Laboratories, Inc. 0 Community Drive Suite South Burlington, VT 00 Tel: (0)0-0 TestAmerica Job ID: 00-0- TestAmerica Sample Delivery Group: 00-0 Client For: ARCADIS U.S. Inc