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File No. 20-355F6__-A—; KLEINFELDER <br /> April 24, 1992 <br /> o <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 April 3 , 1992 , we were able <br /> to measure groundwater in three wells. The groundwater was <br /> measured at depths of approximately 5 inches and 3 feet <br /> below existing ground surface in wells at locations 1 and <br /> 3 on Plate I. In the well measured at location 2 on Plate <br /> I, groundwater was encountered in an artesian condition and <br /> a water stream rose approximately 12 inches above the top <br /> of the well when the vent cap was removed. It appears that <br /> groundwater in the area is in an artesian condition, and <br /> the water levels measured are piezometric levels. This was <br /> evidenced by the fact that no free groundwater was <br /> encountered in the 3-foot deep test holes drilled in the <br /> vicinity of location 2 on Plate I. The regional <br /> groundwater depth map for spring 1991, published by the San <br /> Joaquin County Flood Control and Water Conservation <br /> District, Plate II, does not indicate the depth to <br /> groundwater in this area. <br /> w <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 northerly direction. <br /> ITEM C-5: i <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 />` I <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 /> t. involves only a 2-acre split from the approximate 20--acre <br /> property. Therefore, in our opinion the likelihood of a <br /> significant change in the nitrate level of the groundwater <br /> beneath the site, due to one additional system, is remote. <br /> If additional more concentrated development is planned in <br /> the area, we suggest that consideration be given to s <br /> completing a nitrate loading study. <br /> Copyright 1992 Kleinfelder, Inc. Page 3 of 5 <br />