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1 <br /> 1 <br /> • Spectrum Exploration (Spectrum), a State licensed dnlling company (C57-512268), performed <br /> 1 dnlling and well development services Ground Zero technician Anthony Scoma conducted all <br /> groundwater sampling Argon Laboratones (FLAP #2359) and A&L Western Agricultural <br /> 1 Laboratory(FLAP #1657), both state-certified testing laboratones, performed laboratory analyses <br /> The investigation was conducted under the direct supervision of John Lane of Ground Zero, a <br /> 1 California Registered Geologist <br /> 1 3.0 BACKGROUND INFORMATION <br /> 3.1 Site Location <br /> 1 The subject site is located at 8200 N Highway 99 (corner of Frontage Road and Foppiano Lane), <br /> Stockton, California (Figure 1) The site is bounded by a vacant field to the east, Foppiano Lane <br /> 1 and an unlined drainage ditch to the south, Frontage Road and Highway 99 to the west, and <br /> residential ranchettes to the north The area is primarily agricultural The site is currently <br /> 1 operated as a convenience store and previously utilized three USTs to store and distribute <br /> 10 gasoline <br /> 3.2 Regional Geologic Setting <br /> The site is situated in the northern portion of the greater Stockton area in Section 18, Township 2 <br /> North, Range 7 East, San Joaquin County, California The property is located in the San Joaquin <br /> 1 Valley physiographic province The valley is a topographic and structural basin bounded on the <br /> 1 east by the Sierra Nevada and on the west by the Coast Ranges The local topography slopes <br /> gently toward the southwest at approximately 9 feet per mile <br /> 1 The near surface geology of the region is compnsed of unconsolidated alluvial deposits of <br /> 1 Pleistocene to Holocene age These deposits, sometimes referred to as the "older alluvium", <br /> consist of intercalated beds of gravel, sand, silt and clay Underlying the older alluvium are <br /> 1 Pho/Pleistocene continental deposits of similar denvation and lithology The older alluvium <br /> functions as the most important aquifer in the site area (USGS Professional Paper 1401-C, 1986) <br /> 1 Soils developed on the alluvium are generally well drained, diffenng from the parent matenal <br /> only in the increased volume of organic matter (DWR Bulletin No 146, 1967) <br /> 1 3 <br /> data/groundzehuleburg/reportslmud_has_weltrepod doc <br /> 1 <br />