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File No. 20-3704-01 k4 KLEINFELDER <br /> March 18, 1993 <br /> III of this report, it appears that the main groundwater gradient in spring 1992 was in <br /> roughly the west-northwest direction. <br /> As requested by San Joaquin County Environmental Health in their "Conditions of <br /> Approval," we collected water samples from the Lima residence domestic well located <br /> at 20655 Tinnin Road (location 1 on Plate I). The samples were delivered to FGL <br /> environmental laboratory in Stockton for nitrate content and DBCP testing. The test <br /> results will be submitted under separate cover as soon as the results are received from <br /> the laboratory. <br /> We note that our scope of services did not include a detailed evaluation of the potential for the <br /> septic systems to affect the quality of groundwater. However, the project involves the possibility <br /> of only one additional septic system within the approximate 39-acre site. Therefore, with <br /> groundwater estimated at approximately 10 to 12 feet deep, in our opinion the likelihood of a <br /> significant change in the nitrate level of the groundwater beneath the site, because of one <br /> additional system, is remote. If additional, more-concentrated development is planned in the <br /> area, we suggest that consideration be given to completing a nitrate loading study. <br /> This completes our scope of services at this time. Based on the above information, it is our <br /> opinion that the proposed parcels are suitable for septic system use. The new septic system <br /> should be located and future wells should be constructed following County requirements. <br /> Continuous monitoring of the on-site septic systems should be maintained throughout the duration <br /> of their use. Once this report is reviewed by Environmental Health Services, we would be <br /> pleased to furnish a proposal for providing whatever additional information they may require for <br /> their evaluation. <br /> If you have any questions regarding this report and the attached information, please contact us. <br /> Respectfully submitted, <br /> KLEINFELDER, INC. <br /> Edward T. Horley <br /> y <br /> Staff Engineer <br /> Jzo ti A_-�'=�/52 0 <br /> Ron Heinen, G.E. <br /> Regional Manager <br /> ETH:sh <br /> Attachments <br /> cc: San Joaquin County Environmental Health/Quartaroli and Associates <br /> Copyright 1993 Kteinfelder, Inc. Page 3 of 4 <br />