REMEDIAL INVESTIGATIONSITESGAMBELL, ST. LAWRENCE ISLAND, ALASKAGROUNDWATER SAMPLINGPrepared for:U.S. Anny Engineer District, AlaskaUnited States Army Engineer District, AlaskaP. O. Box 898Anchorage, Alaska 99506-0898March 26, 1999Prepared by:Montgomery Watson4100 Spenard RoadAnchorage, Alaska 99517Montgomery Watson Project No. 1189098.040101Contract No. DACA85-98-D-0007F1 OAK069603_03.1 O_0011_a200-1e~ MONTGOMERY WATSONMay 17, 1999Ms. Suzanne BeauchampDepartment of the AnnyU.S. Anny Engineer District, AlaskaEnvironmental Engineering BranchP.O. Box 898Anchorage, Alaska 99506-0898Dear Ms. Beauchamp:Montgomery Watson is forwarding this letter (document) for your files. This shall serve asthe final requirement of the groundwater sampling at Gambell, Alaska in March 1999.The objective of this round of groundwater sampling was to detennine if hydrocarbons,which might be present in the soil resulting from former military activities, might bepresent in the potable water system in Gambell, St. Lawrence Island, Alaska.The scope of work consisted of collecting and analyzing water samples from the fourmonitoring wells (MW) constructed in 1998 and two samples from the village water well.The village water well samples were to be collected from the village well point and a postc1orination tap, located in the village water treatment facility.This report is being presented in the following format:• Summary of events and results.• Tabbed sections containing the Sample Results Comparison to AlaskaRegulations, Field Forms, and Laboratory Results.The field team consisted of Bonnie McLean, field team leader, and Doug Quist, senior fieldchemist. On March 25, a field survey verified that all the monitoring wells were frozensolid. Below top of casing ice measurements were collected and recorded, except MW 29,which was covered by four feet of hard packed snow.Sampling of the village water well and tap were completed on March 26, 1999. All qualitycontrol (QC) samples (a duplicate and MSIMDS) were collected with the primary sample(99 GAM NVW 001) from the new village well house. A second primary sample wascollected from a tap (99 GAM TAP 001) just after the clorinazation treatment in the watertreatment building. All samples were analyzed for the following: DROIRRO, GROfBTEX,VOC, SVOC, Alkalinity, Chloride, and Ion balance. The results are included in thisdocument.The pump has been pulling a greater amount of sediment than normal and the operator hasto wash the filters every other day instead of weekly.4100 Spenard RoadAnchorage, Alaska99517·2901Te:' 907 248 8883Fa' 907 248 8884Serving rhe World's Environmenral NeedsMs. Suzanne Beauchamp2May 17, 1999It was learned that a 1 1/4" return supply line feeds treated water back to the well houseand dumps directly into the well gaBery.This results in treated return water beingincluded in part, with the wen water sample. Analytical results are shown in the attachedtable and a comparison is of results to ADEC applicable regulatory criteria are alsopresented.In summary, DRO, RRO, GRO, and BTEX were an non-detect (ND). Four compoundscomprising Total Trihalomethanes (TTHMs) were not ND seem to be a result of theclorination process. TTHMs are the sum of the concentration of bromodichloromethane,dibromochlormethane, tribrornmethane (bromoform), and trichloromethane (cloroform).The results were much higher in the TAP sample for these compounds then in the dilutednew village wen (NVW) sample. The Total Trihalomethanes (TTHMs) contaminant levelwas below the ADEC Drinking Water Regulation.An sample results were below ADEC regulations.If you have any questions, please gi ve me a caB at 266-1141.Sincerely,.-.Bonnie McLeanField Team Leaderpis COl_3.1.2/1189098.040101SAMPLE RESULTS COMPARED TO ALASKA REGULATIONSThe following table is a summary of primary and duplicate positive sample resultscompared to Alaska Department of Environmental Conservation (ADEC) Title 18Chapter 80 Drinking Water Regulations (ACC 80.070), 1994. Sample results are belowmaximum contaminant levels.- -.... _. --- ... -_. - -_.-- ......... __ ..... --.-00cc...~0.0E...EeE..cu~~..c..c0E0l0..cu:s0Sample illE~o 0.0~ E99GAMNVWOOI0.0017*99GAMNVW201 0.00170.02799GAMTAPOO 1c.20I-0000E~~..co E0.0010.00150.00140.028UNO0.014~EEc.20E0I-TIHMsmgILMaximumContaminantLevelTIHMsmgIL~NONO0.0110.00420.00310.080.10.10.1*-Sample 99GAMNVW201 is the field duplicate sample of 99GAMNVWOOI.TIHMs -Total Trihalomethanes (the sum of the concentrations of bromodichloromethane.dibromochloromethane. tribromethane(bromoform) and trichloromethane (chloroform».DATA REVIEW OF PRIMARY AND FIELD DUPLICATE SAMPLESWater analysis data for the March 26, 1999 sampling of Gambell Site 5 have beenreviewed for precision, accuracy, and completeness. Four samples, including twoprimary samples, one trip blank, and one field duplicate were submitted to QuanterraEnvironmental Services, Anchorage, Alaska for analysis.The following quality control (QC) samples and indicators were reviewed in accordancewith the established PARCC parameters (PARCC parameters were defined in the QAPPAddendum for Site 5 Remedial Invistigation Work Plan, Gambell, Alaska).•••••••Holding TimesField and laboratory blanksField and laboratory duplicate/split samplesMatrix spike/duplicate matrix spike samplesLaboratory control/duplicate laboratory control samplesMethod reporting limitsSurrogates•Sample receipt informationA review of the data submitted indicates that the resulting data set is suitable for itsintended use, with some qualification, as described in the following sections.Data Review ResultsA review of the Gambell Site 5 data packages indicates that all sample results and reportsubmittal elements (hard copy) were complete, correct, consistent and complied withcontract requirements. The following text summarizes significant data review findings.•The VOC by SW8260 MS/MSD percent recoveries were within laboratoryacceptance limits, with the exception of 2-chloroethyl vinyl ether, styrene, and vinylacetate in sample 99GAMNVW201. Two analytes were qualified as rejected (VR)due to 0% recoveries, and one analyte qualified with an estimated practicalquantitation limit (VQQ).AnalytesampleresultugIL% recoveriesMS% recoveriesMSDAcceptanceCriteriaQualifier2-chloroethylvinyl etherstyrenevinyl acetateNDNDND130-70VRNDND7.754.70ND18.2136-45130-70VRVQQ•The SVOC by SW8270 MS/MSD percent recoveries were within laboratoryacceptance limits, with the exception of benzidine, acenaphthylene, bis(2chloroisopropyl) ether in sample 99GAMNVWOO1. One analyte was qualified asrejected (VR) due to 0% recovery, and two analytes were qualified with an estimatedpractical quantitation limit (VQQ).Analytebenzidineacenaphthylenebis(2chloroisopropyl)ether•sampleresultugILNDNDND%recovenesMSND41.958.7%recoveriesMSDAcceptanceCriteriaQualifierND178-1126-56169-63VRVQQVQQ41.155.6The percent difference between the cation and anion for sample 99GAMNVW201exceeded the acceptable percent difference limit of +/- 2% with a percent differenceof 4.89%. All other ion balances did met acceptance criteria.GambellComplete Analytical DataField Sample IDSamp. DateParaIJJeterResultMRLUnitsFlagMethodLab Samp_ No.LabQESZ99GAMNVWooI03126/1999Gasoline Range OrganicsNO(0.10)mgllAKIOI0636640002SA99GAMNVWool03126/1999Diesel Range OrganicsNO(100)ugllAKI020636640002SAQESZ99GAMNVWooI03126/1999Residual Range OrganicsNO(250)ugllAKID30636640002SAQESZQESZ99GAMNVWooI03126/19991.1,1.2-TetraChloroethaneNO(1.0)ugllSW82600636640002SA99GAMNVWooI0312611999I, 1,1-TrichloroethaneNO(1.0)ugIlSW82600636640002SAQESZ99GAMNVWool03/26/1999I, I,2,2-TetraChloroethaneNO(1.0)ugllSW82600636640002SAQESZ99GAMNVWool03126/19991,1,2-Trichloro-l,2.2-tritluoroethaneNO(1.0)ugllSW82600636640002SAQESZ99GAMNVWool03126/19991,1.2-TrichloroethaneNO(1.0)ugIlSW82600636640002SAQESZ99GAMNVWool03126/1999I,I-DichloroethaneNO(1.0)ugllSW82600636640002SAQESZ99GAMNVWool03126/1999I,I-DichloroetheneNO(1.0)ugllSW82600636640002SA . QESZ99GAMNVWool03126/1999I,I-DichloropropcneNO(1.0)ugllSW82600636640002SAQESZ99GAMNVWool03126/19991,2,3-Trichlorobenz.eneNO(1.0)ugIlSW82600636640002SAQESZ99GAMNVWool03126/19991,2,3-TrichloropropaneNO(1.0)ugIlSW82600636640002SAQESZ99GAMNVWool03126/19991,2,4-Trichlorobenz.eneNO(1.0)ugIlSW82600636640002SAQESZ99GAMNVWool03126/19991,2,4-TrimethylbcnzeneNO(1.0)ugllSW82600636640002SAQESZ99GAMNVWOOI03126/19991,2-Dibromo-3,Q. I.e.(Laboratory:Quantem. Illc5761 Silverado WayAnchorale, Ak 99502907-563-4100907·563-4815 FAX'Alln: andy LeFemMW Job Number:1189098.04010114·DAY~:i.~o,TURNAROUND99GAMTAP 00 f99GAMtJV~ 00199 GAMfJ\J W 20 I99 GAM~T'3G;V,~ fCj I \J99 GAM99 GAM99 GAM99 GAMDalehTime--~----Laboratory NOli liedFiledI~--.?0312419911 :01 '" MQAlQC for USCOEProject Name (~be\\Project Number_Date: 3-'21 ... f'lqcoc:Completed By:l1un\ ..- 'Primary9C1 C A-n-'\ t.J V 1.1 ) ~Ic;;:..~ ScqCf C'n... \\/ ~I"l\Parameters~,(.tII2.DJ