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03/08/2006 13 32 FAX 036/041 <br /> in KLEINFELDER <br /> A,e1,1 1vamed cvmpam• <br /> File No. 23197.G02 <br /> March 6, 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 supplement to our revised Soil Suitability And Nitrate <br /> Loading Study that was issued on March 6, 2006 for the Ashton Place 2 subdivision. <br /> The 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 Pubic 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 mo as Nitrogen (N). In our evaluation of <br /> nitrate loading, we have used the Hantzsche mass balance equation (source: Prodicting <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 ou. study. <br /> As required by Mr. Huggins with SJCEHD, we have calculated the average nitrate (N,) <br /> in groundwater based on two homes per lot being developed in the future. <br /> No= AWNw(1-D)+ (Nb) r <br /> AW +r <br /> Where! <br /> NQ = Average calculated nitrate-nitrogen in groundwater resulting from domestic <br /> sources and precipitation — mg/l, as N <br /> 23197.G021STOLTF7 Alai ch 6.2006 <br /> Copyright 2006 Kfeir ,felder.Inc Faye 1 of 4 <br /> KI FINFELDER 21125 East Myrtle Street. Stockton. CA 95205-4794 12091948-1345 (3091 948-0621 'ax <br />