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KLEINFELDER <br /> File No. 20-3399-01 <br /> October 5, 1990 <br /> I . The topographic map provided to us indicates locations <br /> 2 , 3 and 4 are approximately 10 to 15 feet lower in <br /> elevation than location 1, which is largely responsible for <br /> the variation in groundwater depths. Regional groundwater <br /> maps published by the San Joaquin County Flood Control and <br /> Water Conservation District, Plate II, indicate groundwater <br /> in this area was approximately 40 feet below existing <br /> ground surface in the fall of 1989 . <br /> Based on County requirements for a small single parcel <br /> split, 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 published maps. Based on the groundwater map <br /> showing lines of equal elevation of groundwater, Plate III , <br /> we conclude that the main groundwater gradient is in <br /> roughly the northwest direction. However, local variations <br /> in groundwater gradient are possible due to the close <br /> proximity of the Stanislaus River to the south. <br /> This completes our scope of work at this time. Based on the above <br /> information, and provided County requirements for locating septic <br /> systems are followed, it is our opinion that the proposed 3-acre <br /> and 93-1/2-acre parcels are suitable for septic system use. <br /> However, continuous monitoring of the septic systems should be <br /> maintained throughout the duration of their use. Once this report <br /> is reviewed by the local health district, we would be pleased to <br /> furnish a proposal for providing whatever additional information <br /> 4 <br />