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M KLEINFELDER <br /> recorded and used to calculate the percolation rate in minutes per inch. The estimated <br /> percolation rates for each test are summarized below. A copy of our field percolation test (� <br /> results signed by a representative from SJCEHD is attached (Plate 15). Additional details <br /> 6- regarding each test can be found on the attached percolation test sheet. <br /> Test Number Performed Depth (feet) Percolation Rate (min./inch) <br /> P-1 3.0 0 <br /> 21.8 5 <br /> 7. NITRATE LOADING CALCULATIONS <br /> The following summarizes our nitrate loading calculations for the proposed leach field using <br /> i the Hantzsche mass balance equation (source: Predicting Groundwater Nitrate-Nitrogen <br /> Impacts, Hantzsche and Finnemore (1992)). The Hantzsche mass balance equation and an <br /> explanation for each factor or value used in the equation are presented below. The selection of <br /> each factor was based on previous studies performed by our firm, the San Joaquin County <br /> Sewage Standards, communications with Mr. Mike Huggins with SJCEHD, information <br /> provided in a report dated March 19, 1997 prepared by the Questa Engineering Corporation and <br /> authored by Mr. Hantzsche for a development in the Stockton area, a technical memorandum <br /> 6" titled "Hydrologic and Soil Investigation for the Chico Urban Area" authored by Dames and <br /> Moore in April 1996, and a technical paper authored by Hantzsche and Finnemore and <br /> presented in the July-August 1992 Ground Water journal titled "Predicting Ground-Water <br /> 6' Nitrate-Nitrogen Impacts." <br /> Ne =AW& (1-D) +(Nb) R <br /> " AW+R <br /> Where: <br /> .. N, = Average calculated nitrate-nitrogen in groundwater resulting from domestic sources <br /> and precipitation-mg/l, as N. <br /> A = Number of dwelling units per acre on septic tanks(unit/acre) <br /> Phase 1 = 2.01 (estimated based on a calculated value of 1,687 gal./day divided by <br /> 150 gal./dwelling unit divided by 5.6 acres.) <br /> L 2 Phase 2 = 3.07 (estimated based on a calculated value of 2,572 gal./day divided by <br /> 150 gal./dwelling unit divided by 5.6 acres.) <br /> W = Annual wastewater loading per dwelling unit per acre (inches) =2.0 inches (per year <br /> per dwelling unit assuming a flow of 150 gal./day/dwelling unit.) <br /> L <br /> 40141.G01/ST04R206 February 24,2004 <br /> ©2004 Kleinfelder,Inc. Page 5 of 7 <br /> r <br />