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1050 Melody Lane, Suite 160, Roseville, California 95678 <br /> (916)782 2110 Fox(916)7867830 <br /> EGI <br /> ENVIRONMENTAL, INC. ���� o <br /> October 19, 1993 OCT 2 2 1993 <br /> EN PIEROI�NIll1E5 VICNTAL ES <br /> Mrs Mary Lou Pontes <br /> 707 East Yosemite Ave <br /> Manteca, CA 95336 <br /> Subject Groundwater Monrtonng Report <br /> Pontes Quicki-Kleen Car Wash <br /> 707 East Yosemite Ave , Manteca, California <br /> Dear Mrs Pontes <br /> Aegis Environmental, Inc (Aegis), is pleased to provide this report documenting the <br /> results of quarterly groundwater monitoring, conducted on October 11, 1993, at the <br /> subject site (Figure 1) The monitoring included the collection of depth-to-groundwater <br /> measurements and water samples from three wells (MW-1, MW-2, and MW-3) located <br /> on site (Figure 2) This report is subject to modification as newly acquired information <br /> may warrant <br /> SITE DESCRIPTION <br /> The 707 East Yosemite Avenue site is an active mini-mart/service station and carwash <br /> in Manteca Three steel underground storage tanks (UST) are located adjacent to the <br /> carwash building Two fuel dispensing islands are located west of the UST (Figure 2) <br /> BACKGROUND <br /> In January 1987, Canonie Environmental, of Stockton California, trenched and collected <br /> two soil samples from beneath the product piping adjacent to the western fuel dispensing <br /> island, after the piping failed a pressure test Soil analysis indicated total petroleum <br /> hydrocarbon (TPH) concentrations ranged from below detection limits (BDL) to 1,500 <br /> parts-per-million (ppm) Subsequent to the soil sampling, approximately 3 to 5 cubic yards <br /> of petroleum-bearing soil were excavated adjacent to the western dispenser island, under <br /> the supervision of the San Joaquin County Environmental Health Department (SJCEHD) <br /> The excavation was backfilled with clean fill material The UST are approximately 30 <br /> years old, however, they were lined with fiberglass in November 1987 The product and <br /> vapor lines were replaced after the UST fiberglass work <br /> 93-042A QMR <br />