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wf <br /> 'v <br /> A <br /> _ to 41 pPm- <br /> we11s resulted in concentratronof Twaterumonitoring <br /> these to October 1988 ground �I. Free floating <br /> From September 1987 erformed by K_ toluene, <br /> and sampling at the site was p <br /> product was observed in MW_3. TPH-G and benzene <br /> nconcentrations <br /> and xylene (BTEX) constituent wells {MW-4 to <br /> ethylbenzene, samples from five of the <br /> were detected in the P <br /> MW-8) ' Geoscience insta,11ed <br /> August 1990, Alton 2 AMW-3, and <br /> Between April ani, Aug wells (AMw-1� ��' ` <br /> Analytical results of soil sampled from the <br /> four additional nAnalytic reported detection <br /> AhtW-4) offsite. BTEX <br /> well borings indicated no TPmpleafrom AM47-2e <br /> limits except in the soil sample les from boring <br /> in the samples in the <br /> were detecteds ples revealed TPH-G <br /> constituents 0.10 ppm• <br /> p4 _1, Analysis of water P <br /> from AMW-1 and AMW-3 at concentrations o <br /> samplesthe ground water samples <br /> primary <br /> BTEX. constituents were detected �n water. <br /> s below <br /> from um c <br /> 3 and AMW-4 at concent aforndrinkingswate p <br /> maximum contaminant levels <br /> 1990, Alton Geoscience monitored and <br /> On July i2 and 20, Free product was again observed in MW--' <br /> sampled each well. foot. TPH--G and BTEX was detected in <br /> 0.65 6 _8 and AMW-1 <br /> with thickness of 4 MW-5, MW-6, orted detection <br /> the sample from Mkr-2+ t AMW-2, pNq_3, and <br /> TPH-G and STEX weresamples MWtla MW-7, the rep <br /> limits in the samp <br /> AMW-4• <br /> FIELD pROCEDURES sampled <br /> 1991, Alton Geoscience monitored nand MW-1 <br /> t On June 27, Wells AMW-1 thru AM� 4 ling were in <br /> ground water Monitoring water monitoring and samp <br /> h -8, GroundRegional <br /> thraug th the requirements of the CaliforniaCalifRegion (RWQCB) <br /> accordance w:y Control Board, Central Valley 1 .c <br /> uality Health Services (SJCPHS) . <br /> Water Q uin County public H. <br /> and the San Joaq depth and <br /> ling each welly total well <br /> prior to purging and sampling <br /> to Lhe nearest 0.01 foot <br /> depth to ground water <br /> of each well casing using an <br /> from a reference mark at the top <br /> electric sounder. volumes <br /> led after purging three well caving <br /> Each well was samp <br /> temperature, and conductivity <br /> or until stabilization of PH, les were collected using a <br /> Ground water samples <br /> presence of free product <br /> the <br /> was achieved. observed for <br /> clean bailer and les were then transferred iced <br /> and sheen. Ground water samples laced into an <br /> appropriate clean sample containers and P <br /> to a California-certified laboved�,}y. <br /> cooler for delivery disposal <br /> - --_ - --- _-Purged-groundwater was st -ooffsite1disposal <br /> 55-gallon drums for--subsequent <br /> 2 <br />