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q e <br /> F J <br /> w <br /> 1050 Melody Lane,'Suite 160, Roseville. California .95678 <br /> (916)782 2170 Faoc(916)786 7830 <br /> ENVIRONMENTAL, INC. <br /> August 2, 1993 <br /> Mrs. Mary Lou Pontes <br /> Pontes Quicki-ICleen Carwash <br /> 707 East Yosemite Avenue <br /> Manteca, California 95336 <br /> Subject: Monitoring Well Installation Workplan <br /> 707 East Yosemite Avenue, Manteca, California <br /> Dear Mrs. Pontes: <br /> L <br /> Aegis Environmental, Inc.' (Aegis), is pleased to submit this letter workplan for the <br /> installation of one groundwater monitoring well at the subject site. The investigation will <br /> include the drilling, logging and sampling of one 30-foot-deep soil boring, to be completed <br /> as a monitoring well, adjacent to the western fuel dispensing island. This investigation i <br /> has been requested by the San Joaquin County Environmental Health Department <br /> (SJCEHD), to assess the potential petroleum hydro:carbon impact to groundwater. <br /> BACKGROUND : . I <br /> The 707 Yosemite Avenue site is an active mini- art/service station and carwash in i <br /> Manteca.' Three steel underground storage tank (UST) are located adjacent to the <br /> carwash building and two fuel dispensing islands west of the UST (Figure 1). In January <br /> 1987, Canonie Environmental, of Stockton Califon 0a, trenched and collected two soil <br /> samples from beneath the product piping adjacent t the western fuel dispensing island, <br /> after a Petrotite test. Soil- analysis indicated total petroleum hydrocarbon (TPH) <br /> concentrations ranged from below detection limits to 1,500 parts-per-million (ppm). <br /> Subsequent to the soil.sampling, approximately 3 tc 5 cubic yards of petroleum bearing <br /> soil were excavated adjacent to the western dispens r island, under the supervision of the <br /> SJCEHD. The excavation was backfilled with clean fill material. The UST are <br /> approximately 30 years old, however Armor-Seal of incinati, Ohio, fibergiassed the UST <br /> 93-042B.WPN ` <br /> . i <br /> I <br />