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k" KLEINFELDER <br /> An emp/ogee owned company <br /> File No. 23197.G02 <br /> February 14, 2006 <br /> Mr. Ryan Voorhees <br /> CRV Enterprises, Inc. <br /> 28082 Nichols Road <br /> Galt, CA 95637 <br /> Subject: ADDITIONAL NITRATE LOADING CALCULATIONS <br /> PROPOSED ASHTON PLACE 2 SUBDIVISION <br /> PETERS, CALIFORNIA <br /> Dear Mr. Vorhees: <br /> As requested, this letter is a supplemental to our Soil Suitability And Nitrate Loading <br /> Study that was issued February 10, 2006 for the Ashton Place 2 subdivision. The <br /> purpose of our study was to determine the suitability of the property for septic tank <br /> usage. The study was performed in general accordance to the requirements of Section <br /> 9-10100© of San Joaquin County Ordinance. The following includes additional results <br /> of our nitrate loading calculations for the above-mentioned subdivision <br /> Nitrate Loading Calculations <br /> We have been requested by Mr. Mike Huggins of the San Joaquin County Public Health <br /> Services Department Environmental Health Division (PHS/EHD) to calculate the nitrate <br /> loading for the proposed leach field. As you are aware, the drinking water standard for <br /> nitrate is 45 milligrams per liter (NO3) and 10 mg/I as Nitrogen (N). In our evaluation of <br /> nitrate loading, we have used the Hantzsche mass balance equation (source: Predicting <br /> 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. <br /> We have calculated the average nitrate (Nc) in groundwater based on two homes per lot <br /> being developed in the future as required by Mr. Huggins with SJCEHD. <br /> N,= AWN„, (1-D) + (Nb) r <br /> AW + r <br /> Where: <br /> Nc = Average calculated nitrate-nitrogen in groundwater resulting from domestic <br /> sources and precipitation — mg/l, as N <br /> 23197.G021STOL057 February 14,2006 <br /> Copyright 2006 Kleinfelder, Inc. Page 1 of 4 <br /> KI FW FELDEit 281S East Mvrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 94M621 fax <br />