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1 communicated to Kleinfelder as a newly proposed spray application field. Two additional <br /> borings were advanced south of the Western Pacific Railroad (GT-1 and GT-2). Groundwater <br /> was encountered in one of these four boring, GT-2 at a depth of approximately 20 feet bgs. <br /> Two (2) deep soil borings (TW-1 and TW-2) were advanced near the one million gallon storage <br /> 1 pond and the near the proposed 114 million gallon pond, respectively (Plate 3). The deep soil <br /> borings were drilled (until groundwater was encountered) at a maximum depth of 121 feet bgs in <br /> TW-1, and 26 feet bgs in TW-2. Groundwater rose in TW-I to approximately 90 feet bgs. <br /> Groundwater was encountered at approximately 13 1/2 feet bgs in TW-2 and rose to <br /> approximately 7 feet bgs. <br /> The eleven geotechnical soil borings were advanced in the proposed dam areas of the 114 million <br /> ■ gallon wastewater pond Kleinfelder Report No. 20-4594-04.G01, dated August 14, 2001 (Plate <br /> 4). First encountered subsurface water varied from 3 to 34 feet bgs. The shallowest water was <br /> found in the middle of the intermittent stream the deepest water was detected along the flanks of <br /> the drainage. <br /> Based on review of the subsurface groundwater elevations it appears that most of the shallow <br /> subsurface water generally mimics surface topography especially in the southwestern parcel of <br /> ' the site (Section 4). Shallow subsurface water was found primarily near low lying area and near <br /> drainages. Groundwater depths near hilly areas appear to vary greatly and are anticipated to be at <br /> depths of 100 feet and greater below ground surface. <br /> 1 The site is generally bisected from the southwest to the northeast by an intermittent stream (the <br /> proposed 114 million gallon pond is located within this stream). It has been Kleinfelder's <br /> ' experience that the stream may act as a hydrogeologic barrier, at least to shallow subsurface <br /> water and therefore may affect general subsurface groundwater flow direction and gradient. <br /> Groundwater flow directions may also significantly fluctuate due to groundwater pumping, <br /> 1 rainfall, groundwater recharge, etc. Therefore, changes in groundwater depth, gradient and flow <br /> direction may vary at this site with time. <br /> 1 <br /> 1 <br /> 1 <br /> 12406/2002R160 Page 4 of 13 <br /> Copyright 2002,Kleinfelder, [nc. February 20,2002 <br /> 1 KLEINFELDER 2825 East Myrtle Street, Stockton,CA 95205-4794 12091 948-1345 (209)948-0621 fax <br />