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_ P C E R s ti NEIL O. AN RSON & ASSOC., INC. <br /> GEOTECHNICAL SERVICES-ENGINEERING LABORATORIES 22 N Houston Ln <br /> Lodi, California 95240 <br /> D W Lodi (209) 367-3701 <br /> a Stockton (209)472-1091 <br /> qs S C GAP FAX: (209) 333-8303 <br /> September 22, 1998 <br /> Joe Murphy <br /> Dillon& Murphy <br /> -" P.O. Box 2180 <br /> Lodi, CA 95241-2180 <br /> Subject: Nitrate Loading Study <br /> Catholic Diocese of Stockton <br /> Hwy 99 Frontage Rd, S. of Harney Ln. <br /> Lodi, California <br /> Our Job Number: SM-01 <br /> Dear Joe; <br /> Per your request we have completed a nitrate loading study per San Joaquin Co. <br /> Environmental Healths requirements for the subject project. This letter presents the results of our <br /> study. <br /> It is proposed to construct a new Catholic Diocese church facility on a 9.7 acre parcel located <br /> _ on the east side of Hwy 99 Frontage Rd., S. of Harney Lane, Lodi, California. For an approximate <br /> size and layout of the facility see the attached Location Map. The facility will utilize a on-site septic <br /> system to treat and dispose of sewage. This nitrate loading study is being performed to estimate the <br /> effect the proposed septic system effluent will have on the nitrate level of the ground water. <br /> According to the county groundwater map' ground water is between 70 and 80 feet. Due to <br /> the depth of ground water it is unlikely that all leach field effluent will percolate to ground water. <br /> However,for the purpose of this study it was conservatively assumed that all effluent will eventually <br /> percolate to ground water. Effluent will be diluted by rain water and since a on-site storm retention <br /> basin is being utilized it was assumed that all rainfall will percolate down. <br /> Due to the lack of a well on the site a sample of ground water was not able to be obtained to <br /> test for nitrate concentration. However,we have submitted a request for county ground water nitrate <br /> level test results in the general area and this information will be provided when it becomes available. <br /> 'Lines of Equal Depth to Groundwater Spring 1996, San Joaquin County Flood Control and Water <br /> Conservation District. <br />