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f <br /> 09 June 2000 <br /> AGE-NC Project No. 98-0497 j <br /> Page 3 of 10 <br /> province have not been completely defined but are believ d to be metamorphic and igneous in origin. <br /> The northern and southern portions of the Great V*lley Province have been designated the <br /> Sacramento and,San Joaquin Valleys, respectively. <br /> Based on the General Soil Map from the San Joaquin C unty Soil Survey,published by the United <br /> States Department of Agriculture Soil Conservation S rvice in 1.992, 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 tet used soils. The soils are generally derived <br /> froin both marine and non-marine sediment,and are g nerally formed in alluvium derived from <br /> mixed rock sources. <br /> ` The Modesto;Riverbank,Turlock Lake Formations and overlying recent alluvium are the principal <br /> sources of domestic groundwater in the 13,500 square-m le San Joaquin Valley Ground Water Basin <br /> (Basin 5722). This basin is drained primarily by the Sao Joaquin River. The nearest surface water <br /> t feature in the vicinity of the property is the Mormon Slc ugh, approximately 1,000.feet north of the <br /> property. <br /> 2.5. - GROUND WATER DEPTH AND FLOW D CTION <br /> Based on review of the Lines of Equal Depth to Ground vater, Fall 1997 map published by the San <br /> :Joaquin County Flood Control District and Water Conse ation District(FCD&WCD);the estimated <br /> depth to ground water at the site is between 60 and 70 fe t below surface grade(bsg).Review of the. <br /> map Lines ofEqual Elevation of Groundwater,Fall 199 (FCD&WCD)depicts the regional ground <br /> water flow direction towards the northeast.. <br /> Review of historical depth to groundwater maps (FCD WCD)"dating back to 1971 suggests that <br /> ground-water depth near the site has fluctuated betwee 60 and 100 feet bsg. <br /> 3.0. . SCOPE OF WORK , <br /> Based upon analytical results of soil samples colt cted during the preliminary"subsurface <br /> investigation, additional-investigation is required to d termine the lateral and vertical,extent of <br /> impacted soil and ground water at the site. A sensitive receptor survey, identifying possible <br /> contaminant receptors, will also be performed. <br /> Initially' <br /> AGE-proposes to advance and sample four soil-borings, At least three-of these borings will <br /> be completed as ground water monitoring wells. Theells w ll.be developed and sampled on a <br /> quarterly basis.If necessary,additional borings and monitoring wellswill be advanced and installed <br /> Advanced GeoEnvironn ental,Inc." <br />