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1 <br /> LEEDSHILL•HERKENHOFF, INC. <br /> ENIME 303 Second Street,Suite 880 North <br /> San Francisco,California 94107 <br /> 4151243.9980 <br /> February 2, 1990 <br /> FEB 6 1- 0. <br /> ENVIRONMENTAL HEALTI; <br /> Mr. Thomas D. PeltierPERMIT/SERVICES <br /> Engineering Geologist <br /> California Regional Water Quality <br /> Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> Re: Existing Soil Stockpile and Excavation <br /> 102 South Wilson Way <br /> Dear Tom: <br /> This letter addresses the existing soil stockpile and excavation located at 102 South <br /> Wilson Way in Stockton, California. As requested by Public Health Services, San Joaquin <br /> County (the County), LEEDSHILL-HERKENHOFF, INC (LH) collected representative soil <br /> samples from the existing stockpile at this site on November 9, 1989 and analyzed the <br /> samples for petroleum hydrocarbon constituents normally found in gasoline. Eight barrels <br /> containing soil are also stored on site from previous soil borings by others. <br /> Representative grab samples were collected by LH in December 1989 from these barrels <br /> and analyzed. <br /> The locations of the three stockpile grab samples each collected from a depth of 1.5 feet <br /> are shown in Figure 1. The samples were analyzed for total petroleum hydrocarbons <br /> (TPH) in accordance with modified EPA SW-846 methods 5030 and 8015, and for <br /> benzene, toluene, ethylbenzene and xylene (BTX&E) by EPA SW-846 methods 5030 and <br /> 8020. The TPH levels of the three grab samples range from 3.8 ppm to less than the <br /> minimum detection limit of 1 ppm. The BTX&E levels range from a high of 0.075 ppm <br /> xylene in sample 3 to less than the minimum detection limit of 0.003 ppm benzene in <br /> sample 2. The analytical results for the stockpile grab samples are presented on Table 1. <br /> Copies of the laboratory certificates are also enclosed. <br /> Representative grab samples obtained from the eight barrels were collected from the <br /> center of each barrel approximately one foot below the surface and were sent to the <br /> laboratory for analytical testing. The TPH (as gasoline) concentrations of these soil <br /> samples range from a high of 9 ppm to less than the minimum detection limit of 1 ppm. <br /> The laboratory results of these soil samples are also presented in Table 1. <br /> SAN FRANCISCO • SAN DIEGO • DENVER • ALBUOUEROUE • SANTA FIE • PHOENIX <br />