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r <br /> File No. 20-3564-01 "yFTE <br /> . kn <br /> KLEINFELDER <br /> 1 <br /> March 26, 1992 <br /> APR 2 3 1992 <br /> kNVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> minutes per inch, or faster, be located. Based on this <br /> criteria, passing percolation rates of 8-1/2 and 3-1/2 <br /> minutes per inch were obtained on the proposed 4-acre and <br /> 16-acre parcels, respectively <br /> The approximate locations where the passing percolation <br /> rates were obtained are shown on Plate I . The County <br /> approved percolation test sheet is included with this <br /> report. <br /> ITEM C-3 • <br /> "The depth and gradient of the water table; " <br /> During our residence surveys on March 3 , 1992 , we were able <br /> to measure groundwater in two wells. The groundwater was <br /> measured at approximately 92 and 89 feet below existing <br /> ground surface at locations 1 and 2 , respectively, as shown <br /> on Plate I. The regional groundwater depth map for spring <br /> 1991 , published by the San Joaquin County Flood Control and <br /> Water Conservation District, Plate II, indicates that the <br /> depth to groundwater in this area was approximately 105 to <br /> 110 feet. <br /> Based on County requirements for a small parcel split <br /> project, we are not required to establish an on-site <br /> groundwater gradient by drilling test borings. We are <br /> providing a general estimate of the groundwater gradient <br /> based on the regional groundwater elevation map for spring <br /> 1991, published by the San Joaquin County Flood Control and <br /> Water Conservation District, Plate III . Based on this <br /> map, we conclude that the main groundwater gradient is in <br /> roughly the northwest direction. <br /> ITEM C-5• <br /> "Other information as required by the San Joaquin Local Health <br /> District to determine the cumulative effect of the existing and the <br /> proposed development on groundwater contamination; ,-- <br /> We note that our scope of services did not include a <br /> detailed evaluation of the potential for the septic systems <br /> to affect the quality of groundwater. However, the project <br /> involves only a 4-acre split from the approximate 20-acre <br /> property. Therefore, with groundwater at a depth of <br /> approximately 89 to 92 feet, the likelihood of a <br /> significant change in the nitrate level of the groundwater <br /> beneath the site, due to one additional system, is very <br /> remote. If additional, more-concentrated development is <br /> planned in the area, we suggest that consideration be given <br /> to completing a nitrate loading study. <br /> Copyright 1992 Kleinfelder, Inc. Page 3 of 4 <br />