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CLEARWATER <br /> a C; R O U' 1 �t L. <br /> E,,vi- I,I Sara ices <br /> 6 � <br /> to be monitored for several quarters to evaluate post-remediation trends in residual groundwater contaminants and that <br /> confirmation soil borings would be required in the future to deriionstrate remediation of the vadose zone. <br /> The mobile catalytic oxidizer was removed from the site in October 1999. However, all vapor extraction piping remains <br /> in the ground,and the above ground manifold was secured;for potential use in the future(Figure 2). <br /> If <br /> 2.0 GROUNDWATER MONITORING - FOURTH QUARTER 1999 <br /> Groundwater monitoring was conducted in accordance (vith requirements set forth by the SJCPHS/EHD. All field <br /> activities were conducted in accordance with Clearwater's Groundwater Monitoring and Field Procedures (Appendix A)., <br /> 2.1 Field Activities and Laboratory Methods <br /> The following is a summary of field activities conducted during quarterly aroundwater monitoring.at the„site: <br /> it <br /> ,I <br /> • Date sampled: 11/2/99 <br /> • Wells monitored: MW 1,MW-2,and Domestic Well(DW) <br /> • Analytes tested: TPHg,BTEX, and MTBE <br /> • Analytical methods: EPA Methods 8015 (modifie'd)and 8020 <br /> • Laboratory. Entech Analytical,.Labs,Inc Sunnyvale;CA(CA ELAP#2224) - <br /> Groundwater monitoring.was conducted in accordance with the schedule proposed.in Clearwater's Gro undwater and <br /> Remediation System Operation Monitoring Report-First Quarter 1999 dated April 5; 1999. Wells were purged prior to <br /> collection of groundwater samples. Clearwater gauging and well purging data sheets are included in.Appendix-B. <br /> 2.2 Groundwater Monitoring Results <br /> Results of fourth quarter 1999 groundwater monitoring and;sampling are summarized below: <br /> • Depth to groundwater: Ranged from 15.83 (MW3)to 17.4(MW-7)feet below top of casin' <br /> • Flow direction/gradient: Northeasterly at 0.001 ft/ft j G. <br /> • SPH-wells/thickness: No SPH present •. <br /> 1 3, - <br /> • TPHg concentrations: <50 pg/L(DW)to 990 pg/L(MW-2) <br /> • Benzene concentrations: <0,5 pg/L.(DW)to 111;�3 pg/L <br /> • MTBE concentrations: <0.5 pg/L(DW)to 150 MW-2) <br /> C/ 6 <br /> D-107 4Q99 GW&WP Confirmation Borings 2:-' 'r November 15, 1999 <br />