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--- � KLEitiEF ; `)ER <br /> File No. 20-3451-01 <br /> February 27 , 1991 <br /> groundwater gradient by drilling test borings. We are <br /> providing a general estimate of the groundwater gradient <br /> based on the published map. Based on the groundwater <br /> map showing lines of equal elevation of groundwater, <br /> Plate III , we conclude that the main groundwater gradient <br /> is in roughly the north direction. <br /> This completes our scope of worst at this time. Based on the above <br /> information, it is our opinion that the 2 proposed parcels are <br /> suitable for septic system use. We note that our scope of services <br /> did not include a detailed evaluation of the potential for the <br /> septic systems to affect the quality of groundwater. However, the <br /> project involves only a 5-acre split from a 26-1/2-acre parcel. <br /> Therefore, with groundwater at approximately 53 to 60 feet deep, <br /> the likelihood of a significant change in the nitrate level of the <br /> groundwater beneath the site, due to one or two additional systems, <br /> is very remote. If additional development is planned in the area, <br /> we suggest that consideration be given to completing a nitrate <br /> loading study. <br /> As requested by San Joaquin County Environmental Health Personnel, <br /> we collected water samples from the Schaapman well (location 3 on <br /> Plate I) for nitrate content and DBCP testing. The samples were <br /> delivered to FGL Environmental laboratory for testing. The test <br /> results will be submitted under separate cover as soon as the <br /> results are received from the laboratory. <br /> The septic systems should be located and future wells should be <br /> constructed following County requirements. Continuous monitoring <br /> of the septic systems should be maintained throughout the duration <br /> of their use. Once this report is reviewed by Environmental Health <br /> Copyright 1991 KLeinfelder, Inc. 4 <br />