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a n • I <br /> CPT Investigation Work Plan <br /> BP Oil Site No 11193 <br /> C B R I A Stockton, California <br /> August 12, 1999 <br /> Groundwater Monitoring <br /> The table below summarizes the planned sampling frequency for the site wells Well VW-1 has been <br /> added to the groundwater monitoring program as requested In addition to the usual GRO,BTEX and <br /> MTBE analyses, groundwater samples will be analyzed for TAME, ethanol, TBA, DIPS, and ETBE <br /> by EPA Method 8260 during the next monitoring event A proposal for future oxygenate analyses will <br /> be prepared based on the results of this initial sampling event <br /> Well Screened Planned Planned Rationale <br /> Interval Gauging Sampling <br /> (feet b s) Frequency Frequency <br /> VW-1 7-17 Quarterly Quarterly Screens across water table Located near <br /> tanks No previous analytical data <br /> MW-2 195-32 Quarterly Quarterly Screens submerged Located near tanks <br /> Decreasing BTEX and increasing MTBE <br /> trends <br /> MW-3 185-31 Quarterly Quarterly Screens submerged Located near tanks No <br /> reported BTEX since November 1995 <br /> Maximum reported MTBE concentration of <br /> 640 gg/l <br /> MW-4 15-35 Quarterly Bi-annual Screens submerged Located near used oil <br /> (2nd and 4'h) tank No reported BTEX Maximum reported <br /> MTBE concentration of 2 3 gg/l <br /> MW-5 155-32 Quarterly Bi-annual Screens submerged Located near used oil <br /> (2nd and 4') tank No reported BTEX Maximum reported <br /> MTBE concentration of 65 gg/l <br /> MW-6 14-315 Quarterly Bi-annual Screens submerged Located east of site No <br /> (2nd and 4h) reported BTEX since November 1996 <br /> Maximum reported MTBE concentration of <br /> 130 gg/l <br /> MW-7 14-32 Quarterly Bi-annual Screens submerged Located north of site <br /> (2nd and 4`h) No reported BTEX since April 1996 <br /> Maximum reported MTBE concentration of <br /> 10 pg/l <br /> 6 <br />