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WORKPLAN FOR SIERRA LUMBER SITE <br /> 375 West Hazelton, Stockton <br /> SITE DESCRIPTION <br /> The site has a lumber manufacturing business on it and is located <br /> in the topographically flat, commercial/residential area of central <br /> Stockton. Figure 1 is a location map. <br /> The site is underlain by the Calaveras River Alluvium which is part <br /> of the regional Quaternary-age Modesto Formation. Regionally, this <br /> unit ranges from clays to gravels, however only silt and clay were <br /> reported as being encountered during the Underground Storage Tank <br /> (UST) removal. During normal rainfall years, depth to groundwater <br /> is estimated to be approximately 30 feet below the ground surface. <br /> PREVIOUS INVESTIGATION <br /> An Underground Storage Tank (UST) was removed from this site on <br /> August 1, 1988 . The 1000 gallon tank reportedly contained unleaded <br /> gasoline. <br /> Soil samples collected from the bottom of the excavation at the <br /> time of the UST removal were analyzed for Total Petroleum <br /> Hydrocarbon as gasoline (TPHG) ; Benzene, Toluene, Ethylbenzene and <br /> Xylene (BTEX) . The soil samples taken below the UST in native soil <br /> showed 790 and 1200 parts per million (ppm) TPHG at 9 and 15 feet. <br /> Soil was excavated to about 15 feet and aerated. The excavation <br /> was filled in with clean soil. <br /> The former UST area is located on the south westerly side of the <br /> building, under a shed like roof, located behind the warehouse <br /> facing Hazelton Avenue, with the closest cross street Lincoln Road. <br /> Figure 2 presents the location of the former UST area. <br /> One boring was completed in June of 1994 and gasoline contamination <br /> was identified .in the soil samples collected from the boring. <br /> PROPOSED INVESTIGATION AND WORKPLAN <br /> The previous investigation results indicate the soil at this site <br /> is contaminated with TPHG and BTEX. John P. Cummings and <br /> Associates (JPCA) , therefore, proposes to characterize the vertical <br /> extent of the soil contamination. The proposed tasks of the <br /> investigation are listed below: <br /> 1) Prepare a site health and safety plan. <br /> 2 <br />