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File No. 20-3563-01A� ]�'� KEE1NFEEDER March 3 , 1992 ITEM C-3 • "The depth and gradient of the water table; " During our residence surveys on February 27 , 1992 , we were able to measure groundwater in five wells. The groundwater was measured at depths varying from approximately 7 inches (location 1 on Plate I) to approximately 7 feet (location 2 on Plate I) below existing ground surface. The difference in depth to groundwater appears to be partially due to variations in elevation throughout the area. The regional groundwater depth map for spring 1991, 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 small parcel split project, we are not required to establish an cn-site groundwater gradient by drilling test borings. We are providing a general estimate of the groundwater gradient based on the regional groundwater elevation map for spring 1991, published by the San Joaquin County Flood Control and Water Conservation District, Plate III. Based on this map, we conclude that the main groundwater gradient is in roughly the northerly direction. ITEM C-5• "Other information as required by the San Joaquin Local Health District to determine the cumulative effect of the existing and the proposed development on groundwater contamination; " 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 a 10-acre split from the approximate 63-acre property. Therefore, in our opinion the likelihood of a significant change in the nitrate level of the groundwater beneath the site, due to one or two 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. As requested in the County "Conditions of Approval , " we collected a water sample from the well located on site and delivered the sample to FGL Environmental laboratory in Stockton for nitrate content testing. The test results will be submitted under separate cover as soon as the results are available from FGL Environmental . This completes our scope of work at this time. Based on the above information, it is our opinion that the two proposed parcels are Copyright 1992 Kleinfelder, Inc. Page 3 of 4