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19 June 1998 <br /> AGE-NC Project No 98-0465 <br /> Page 2 of 5 <br /> the south to the Klamath Mountains in the north The western and eastern boundaries of tins <br /> province are comprised of the California Coast Range and the Sierra Nevada,respectively The Great <br /> Valley Province is subdivided into two major divisions designated the Sacramento and San Joaquin <br /> Valleys <br /> Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> States Department of Agriculture Soil Conservation Service in 1992, the site area is within the <br /> Jackson-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and <br /> generally consist of moderate to poorly drained fine textured soils The soils are generally derived <br /> from both marine and non-marine sediment, and are generally formed in alluvium derived from <br /> mixed rock sources <br /> 2 4 GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based upon the map entitled Lines Of Equal Depth To Groundwater-Spring 1996, prepared by the <br /> San Joaquin County Flood Control and�Water Conservation District (FCD&WCD), ground water <br /> depth at the site is approximately 20 feet bsg, review of Lines of Equal Elevation of Groundwater <br /> • Spring 1996(FCD&WCD) depicts the regional ground water flow direction towards the northeast <br /> However, flow directions may vary locally and seasonably <br /> 3.0. SCOPE OF WORK <br /> Prior to removing and replacing the USTs at the site, an environmental assessment will be perfoizned <br /> at the site to determine if hydrocarbon-impacted soil and/or ground water is present Angled soil <br /> probe borings will be advanced beneath the existing USTs and dispenser areas Soil and/or ground <br /> water samples will be collected and submitted to a state certified laboratory for analysis of petroleum <br /> hydrocarbons <br /> 3 1 PROBING AND SAMPLING <br /> Initially,AGE proposes to advance up to three angled soil probe bonngs to depths of approximately <br /> 25 feet bsg Soil probe borings will be advanced using a Geoprobe 5400 soil probing unit equipped <br /> with 1 125-inch diameter probe rods and an attached 2 15-inch diameter soil sampler The soil <br /> sampler will be loaded with clean 1 125-inch by 6-inch brass sleeves Probe borings will be <br /> advanced near the UST, piping and dispenser areas Proposed soil probe boring locations are <br /> • Advanced GeoEmuonmenlai,Inc <br />