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Harding Lawson Associates <br /> of TPH as gasoline or $TEX were reported in the composite soil sample of stockpile 3. <br /> f TPH as diesel and motor oil were reported at 5.3 and 13-ppm, respectively. <br /> 6.4 Local WaterSupnlr+ and Groundwater Utilization <br /> LIII <br /> To evaluate the potential water supply impacts from the release of petroleum <br /> hydrocarbons at the site, HLA ascertained the source of the City of Stockton's and the <br /> 1� site vicinity water supply, and local groundwater utilization. <br /> L,J <br /> The City of Stockton (City), Municipal Utilities Department (MUD) indicated <br /> that the City's water supply is currently comprised of 35 to 40 percent treated surface <br /> L .water from the New Hogan reservoir, located to the east of the City in the foothills of <br /> the Sierra Nevada, .and .60 to 65 .percent groundwater from City operated wells. Three <br /> of the City operated wells are located approximately 2,000 to 3,500 feet to the southeast, <br /> southwest, and north of the site._ These wells are generally 300 to 400 feet deep, are <br /> r sealed to a depth of 100 feet, are tested regularly for water quality, and have never <br /> r <br /> shown any evidence of groundwater contamination. MUD and SJCDEH also indicated <br /> that the residential area which extends to within approximately 1,000 to 1,500 feet to the <br /> southwest of the site, to the east of Pacific Avenue and to the south 'of Hammer Lane, is <br /> I <br /> t outside the City limits and water distribution area, and is served by a number of onsite <br /> L <br /> domestic wells. <br /> L <br /> L <br /> T10461-H 16 of 20 <br />