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NOV-21-02 04:28PM FROM-MICROSEPTV 9498553515 T-182 P.01/04 F-622 <br /> ../ 23112 Alcalde Dr.,Sui[e C <br /> Laguna Mills,CA 92653 <br /> Tel 949,855.3500 <br /> Fax 949.855.3575 <br /> micmMicroSepTec Email miuoseprec�minoseptec.com <br /> yr <br /> November 21, 2002 <br /> Ray Borges <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, CA 95202 <br /> Fax No 209-468-3433 A Pages Total) <br /> SUBJECT: UPDATED NITRATE LOADING STUDY- PROPOSED COMMERCIAL CENTER, <br /> MANTECA, CALIFORNIA <br /> Dear Ray. <br /> 1 have updated the previously submitted Nitrate Loading Calculations by Kleinfelder for the above <br /> referenced proposed project to reflect the performance of the EnviroServer System as we <br /> discussed In the telephone a couple of weeks ago. <br /> To be conservative, I have based the nitrate concentration of teach field effluent(N„,) on the <br /> average Total Nitrogen (and not Nitrate-Nitrogen) achieved at the Carmelo Business Park in Tracy <br /> (see attached Table). Furthermore, I am using 0% denitrification of leach field effluent(D), even <br /> though typical denitrification in sand filters or sandy soils, as published by Dr. Converse (University <br /> of Wisconsin), Dr.Tchobanoglous, and others, are 27%-434/0. For everything else, I have used the <br /> same numbers as were previously submitted in the Kleinfelder Report. <br /> Nitrate Wading Calculations for EnviroServer 1500 GPD <br /> A= 5.29 units/acre (same as Kleinfelder Report) <br /> W= 2.0 inches per year per dwelling unit (same as Kleinfelder Report) <br /> Nw= 15.4 mg/I as N (average total nitrogen concentration from Tracy <br /> unit, see attached Table) <br /> D = 0% (number chosen to be conservative) <br /> R= 9.2 inches (same as Kleinfelder Report) <br /> N,= 0.5 mg/I as N (same as Kleinfelder Report) <br /> N,= A W`Nw-0-D) + Nb'R = 5.29'2.0`15471-0L+ 0 519.2 = 8.5 mg/I as N <br /> A"W + R 5.29`2.0 + 9.2 <br /> This concentration of 8.5 mg/I, which is a very conservative estimate, is well below the State <br /> Drinking Water Standard of 10 mg/I of Nitrate-Nitrogen. <br /> Our Mission:To provide wastewater treatment systems that protect the public health and preserve the environment <br />