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CLEAKWATER <br />' G R 0 L P I \ C <br /> Envronmenta! Serv+ces <br /> 2.1 Field Activities <br /> The following is a summary of field activities conducted during quarterly groundwater monitoring <br /> Iof eight wells at the site <br /> o Date sampled November 4, 1998 <br /> Wells monitored MW-1 through MW-7, and Domestic Well (DW) <br /> 0 Analytes tested TPHg, BTEX, and Fuel Oxygenates <br /> (MTBE, ETBE, TBA DIPE, TAME) <br /> Analytical methods EPA Methods 8015 (modified), 8020, and 8240B <br /> Laboratory Entech Analytical Labs, Inc , Sunnyvale, CA (CA ELAP# 2224) <br /> All wells were purged prior to collection of groundwater samples Clearwater gauging and well <br /> purging data sheets are included in Appendix B <br /> 2.2 Gro=drvatea limon-*oring Reszlts <br /> Results of fourth quarter 1998 groundwater monitoring and sampling are summarized below <br /> Depth to groundwater Ranged from 14 20 (MW-1) to 15 80 (MW-7) feet below <br /> top of casing <br /> Flow direction/gradient Northeasterly at 0 002 ft/ft <br /> SPH - wells/thickness No SPH present <br /> TPHg concentrations < 50 gg/L (MW-3, 4, 5, 6, 7, and DW) <br /> to 64,000 gg/L (MW-1) <br /> Benzene concentrations c 0 5 gg/L (MW-3, 4, 5, b, 7, and DW) <br />' to 920 gg/L (MW-2) <br /> MTBE concentrations < 5 0 gg/L (MW-3, 4, and DW) to 1,200 gg/L (MW-2) <br /> I <br /> i <br /> D-107 4Q98 GW & Sys Mon Report 2 January 27, 1999 <br /> I <br />