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KLEINFELDER <br /> An employee owneA company <br /> File No. 17357.1301 <br /> November 5, 2002 <br /> Ms. Deedee Antypas <br /> Siegfried Engineering, Inc. <br /> 4045 Coronado Avenue <br /> Stockton, CA 95204-2396 <br /> Subject: ADDENDUM TO SOILS SUITABILITY AND NITRATE <br /> LOADING STUDY AND R-VALUE TESTING <br /> HORIZON CHRISTIAN FELLOWSHIP <br /> 10702 NORTH LOWER SACRAMENTO ROAD <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Antypas: <br /> Per our telephone conversation today, we understand that the use permit for this project contains <br /> an occupancy of 499 people instead of the 299 people occupancy given to us for the soils <br /> suitability and nitrate loading study dated August 8, 2002. As a result, the nitrate loading <br /> calculations need to be revised. The revised calculations take into account the larger occupancy <br /> as indicated on the use permit as well as the actual usage of the church buildings. We understand <br /> that the buildings will be used for one service three days a week and not used the remainder of <br /> the time. <br /> NITRATE LOADING CALCULATIONS <br /> Per San Joaquin County Environmental Health Division (SJCEHD) requirements, the following <br /> summarizes our nitrate loading calculations for the proposed leach field. The drinking water <br /> standard for nitrate is 45 milligrams per liter (NO3) and 10 mg/I as Nitrogen (N) in groundwater. <br /> In our evaluation of nitrate loading, we have used the Hantzsche mass balance equation (source: <br /> Predicting Ground-Water Nitrate-Nitrogen Impacts, Hantzsche and Finnemore (1992)), which is <br /> presented below with an explanation for each factor and the value used in our study. The <br /> selection of parameters was based on previous studies and investigations performed by our firm <br /> and others, San Joaquin County Sewage Standards, and information provided in a report dated <br /> March 19, 1997 prepared by the Questa Engineering Corporation and authored by Mr. Hantzsche <br /> for a development in the Stockton area. <br /> Nc =AWNw(I-D) +(Nb_)R <br /> AW+R <br /> 17357.G01/ST02R730 November 5,2002 <br /> ©2002 Kleinfelder,Inc. Page I of 3 <br /> KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />