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File No. 20-3683-01 k" K L E IN F E L D E R December 3, 1992 obtained for each property parcel are presented in the following table. The County approved percolation test sheets are included with this report. PERCOLATION RATES Percolation Rate Test Number Parcel (Mins/In.) P-1 1 30 P-2 2 15 P-3 3 30 Designated P-4 Remainder 30 ITEM C-3: "The depth and gradient of the water table;" During our surveys on November 10 and 20, 1992, we were able to measure groundwater in wells at three locations visited. The groundwater was measured at a depth of approximately 56 feet below existing ground surface in all three wells. The regional groundwater depth map published by the San Joaquin County Flood Control and Water Conservation District, Plate II, does not indicate the depth to groundwater in this area. Based on County requirements for a parcel split project such as this, we are not required to establish an on-site groundwater gradient by drilling borings. We are providing a general estimate of the groundwater gradient based on the published map. Based on the groundwater map showing lines of equal elevation of groundwater, Plate III, we conclude that the main groundwater gradient north of the site was in roughly the north to northeast direction in spring 1992. We note that our scope of services did not include a detailed evaluation of the potential for the septic systems to affect the quality of groundwater. However, the project involves only four possible septic systems within the approximate 30-acre site. Therefore, with groundwater at approximately 56 feet deep, in our opinion the likelihood of a significant change in the nitrate level of the groundwater beneath the site, because of a maximum of four additional systems, is remote. If additional, more- concentrated development is planned in the area, we suggest that consideration be given to completing a nitrate loading study. Copyright 1992 KLeinfelder, Inc. Page 3 of 4