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I <br /> I I <br /> ' R604 :UPDATE 10-JUNE, 1992 <br /> June, 1992 ground water sampling, see Table 2 . <br /> • RECOMMENDATIONS <br /> I � <br /> 1 . The Permit to Construct has been obtained. As <br /> requested in the permit, twice weekly sampling of <br /> the effluent is to occur for the first month then <br /> monthly thereafter. Continue vapor recovery on MW1 <br /> and MW5 to continue ground water remediation. <br /> 4 <br /> 2 . Continue to monitor this site on a quarterly bases . <br /> i <br /> 3 . Obtain depth to ground water, vacuum influence <br /> readings to evaluate the effects of vapor <br /> recovery. <br /> 4 . Sample for fecal coliform from MW3 , MW4 , MWS and MW6 <br /> on a quarterly basis during the quarterly sampling. <br /> 5 . Perform monthly monitoring and sampling of the <br /> vapor stream using the GC-PID 10 S 50 chromatograph <br /> and include the results in a monthly update status <br /> report. <br /> 6 . Drill two confirmation sample borings , one near P3 <br /> and the other near SB-2 , to obtain soil samples for <br /> certified laboratory analysis of TPH-BTEX, see <br /> Figure 4 . <br /> 7 . Destroy vapor recovery wells P1 , P3-Swarm and EX. <br /> LOCATION <br /> Regal Station 604 (parcel # 139-020-08 ) is located at 1448 N. E1 <br /> Dorado and Harding Way , Stockton, San Joaquin County, California . <br /> The site is in proDected section 2 ; T1N; R6E; MDB&M at <br /> approximately 14 feet above mean sea level . Initial drilling <br /> (November, 1989 ) encountered ground water at approximately 32 feet <br /> below sea level ( 47' below the surface) and flowing in an east to <br /> southeasterly direction, see figures 1 , 2 , and 3A. <br /> I UPDATE STATUS REPORT #10 <br /> I <br /> WELL SAMPLING AND ANALYTICAL TECHNIQUES <br /> I ' <br /> Depth to ground water measurements were obtained from all of the <br /> ground water monitoring wells on January 21 , February 4 , March 5 , <br /> March 31 , April 24 and June 2 , 1992. Water samples were obtained <br /> from the monitoring wells , by a Western Geo-Engineers (WEGE) <br /> geologist on June 2 , 1992 . Top of casing elevations , as <br /> documented in previous reports , were used. Depth to top of fluid <br /> and ground water measurements were obtained using a clean product <br /> water interface probe. The probe, lowered into the well attached <br /> to a tape calibrated in 0 . 1 foot intervals, signals at the contact <br /> page 2 <br />