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DiETz ENGINEERING AND CONSTRUCTION, INC. <br /> Serving Commercial and Industrial Clients <br /> CA Lic.#638281 <br /> December 15, 2011 <br /> San Joaquin Environmental Health Department <br /> Attn: Rodney Estrada <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Quarterly Inspection and Sampling of MicroSepTec System at Carmelo Business <br /> Park, Tracy, California <br /> Dear Mr. Estrada: <br /> A quarterly inspection of the MicroSepTec system installed at the Carmelo Business Park was <br /> conducted on December 7, 2011. The System was operating normally and no repairs were <br /> required. The meter reading for the effluent discharge was 294359.0. Attached are the results <br /> of the laboratory analysis for nitrate. Based on laboratory results the calculation of the nitrogen <br /> in the effluent is as follows: 7/62 x 1 =0.10 mg/L nitrogen as nitrate. Since this meets the design <br /> criteria of the system no further analysis or investigation was conducted. <br /> If you have any questions please contact me at the number listed below. <br /> Sincerely, <br /> H. B. Dietz <br /> HBD/gwd <br /> Enclosures: Laboratory Analysis <br /> cc: Carl Navarra <br /> 33233 S. Koster Road • Tracy, CA 95304-9142 • (209) 832-2910 • Fax (209) 833-1288 <br />