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x <br /> Ru' <br /> p ��Cn <br /> E111141GRouNDINATERc 1 De ' X9$7 <br /> TECHNOLOGY F-rtinRwAENTAL HEALTH <br /> 11 �RgT/sFRViCES <br /> :nisur,�uF 408D Pike atl.xl:cutERS'sysTF:+!>.1+'c Gane,Sul uncard,CA 94520-1227(415)671.2387 <br /> December 15, 1987 <br /> Job No. 203 475 2894 <br /> Ms. Lori Cotuila <br /> San Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> Re: 7-Eleven, Store No. 2243-20680 <br /> 9110 Thornton Road <br /> Stockton, CA <br /> Dear Ms. Cotulla: <br /> Enclosed are the results of the laboratory" analyses conducted on <br /> seven groundwater samples from domestic wells near the above- <br /> referenced 7-Eleven site. The samples were collected by field <br /> personnel from Groundwater Technology, Inc. (GTI) on November 19, <br /> 1987. A site map illustrating the location of each well sampled <br /> is also attached. As you will note, the laboratory analyses <br /> indicate that all of the wells sampled had non-detectable levels <br /> of petroleum hydrocarbon components with the exception of <br /> domestic wells 91' 1 and 9140. The results from domestic wells <br /> i 9160 and 9140 exhibited concentrations of total xylenes at 3 <br /> parte per billion (ppb) each, far below the Department of Health <br /> Services' (DOHS) drinking water standard of 620 ppb. It should <br /> also be noted that the field blank had 3 ppb total xylenes <br /> detected, which leads us to conclude the xylenes results from <br /> domestic wells 9160 and 9140 are probably due to handling of the <br /> samples in the field or laboratory and total xylenes are not <br /> actually present within the groundwater, <br /> r]tlu•Y i#1/v-RIO)Pd-o N-301,CA;T4:111%FL;Mandevdlr.LA \urwi*d,51A:Snvi,1Sl: <br /> M imi.•JL�hti,�L�;ti M1•C 111'Il il',SII:Chwld+Fop(,PA;lhmrn;1,4udw.Canada <br />