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sample analysis revealed Tpl!-G concentrations of up to 24 ppm <br /> while analysis of ground water. samples resulted in <br /> September <br /> concentrations of TpH-G as high as 41 ppm. From <br /> was <br /> 1987 to October 1988 ground water mon i.tolue n aneth lbinzene, <br /> performed by KEI• TPH-G and benzene, <br /> toluene, Y <br /> and xylene (BTEX) constituent concentrations W-8)e dFreeLed �n <br /> the samples from five of the wells <br /> floating product was observed in MW-3. <br /> Between April and August 1990, Alton Geoscience, Inc. <br /> Wells (AMW-1, AI1W-2r <br /> 4 offsite. Analytical results of soil <br /> installed four additional monitoring <br /> AMW-3, and AMW- ) <br /> sampled from the well borings indicated no TPH-G above m <br /> the <br /> were detected only in the smppHsG <br /> reported detection limits except in the soil sample from <br /> AMW_.2. BTEX constituentsof water samples revealed <br /> from boring AM from Analysis3 at detectable levels of <br /> in the samples <br /> from AMSj_l and AMW- from <br /> loo pp rima, maximum <br /> b. BTEX constituents were detected in t e samples <br /> AM47-3 and Amw-4 at concentrations beloWa�� to primary <br /> contaminant <br /> levels (MCL) for drinking <br /> 12 and 26, 1990, Alton Geoscience Inc. monitored and <br /> On July p product was again observed in MM-3. <br /> sampled each well. tee pfrom MW-41 Wfi-5, <br /> TPH-G was detect aninBtheTEX sample :were detected above the <br /> and MW-8. <br /> reported detection limits in the samples from mw-1 and mW-7• <br /> FIELD pRGCEDURES Inc. , monitored <br /> From November 2 to 5, 1990 Alton Geoscience, wells at <br /> and sampled the twelve ground water mlocaednat 2375 Tracy <br /> 1 former Mobil acy, Californce ia.lOThe 4ground water monitoring <br /> Boulevard, Tracy, <br /> and sampling procedures were in accordance with the <br /> Tonal Water Quality Control <br /> requirements of the CaliforniaRweCB and the San Joaquin <br /> Board, Central valley Region ( SQCB) . <br /> County Public Health Services ( round <br /> Prior to purging and sampling each well, the depth to g <br /> to the nearest 0.01 <br /> Ground water samples were <br /> water was measured from the top of casing <br /> foot using an electronic sounder• <br /> collected using a clean, plastic bailer and observed for the <br /> presence of free product or sheen. <br /> uired casing volumes or until <br /> Each well was purged of the req and conductivity was <br /> stabilization of pH, temperature, <br /> riot to sample collection- Ground water samp es <br /> achieved p a clean bailer and then transferred to <br /> were collected using le containers for delivery <br /> the appropriate clean camp fallowing proper preservation <br /> California-certified lXocedurey• Purged ground water was <br /> and chain of custody^p roved, 55 gallon drums for subsequent <br /> _.._..._stored._ons ite._in .D _..a _ __.... _...__... __.. <br /> offsite disposal- <br />