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DiETz ENGINEERING AND CONSTRUCTION, INC. <br /> Serving Commercial and Industrial Clients <br /> CA Lic.#638281 <br /> March 25, 2013 <br /> APR 0 5 2013 <br /> -M I L. 41EJ-V' 1 <br /> San Joaquin Environmental Health Department <br /> Attn: Rodney Estrada <br /> 1868 East Hazelton Ave. <br /> Stockton, CA 95205 <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 March 18, 2013. No repairs were required. The meter reading for the of i4ent <br /> discharge was6451.40. Attached are the results of the laboratory analysis for nitrate. B4sed-on <br /> laboratory results the calculation of the nitrogen in the effluent is as follows: 14/62 x; 18.Z 4.1 <br /> mg/L nitrogen as nitrate. Although this meets the design criteria of the system it represents- an- <br /> increasing trend. The tenants will be advised not to place household chemicals like bleach into <br /> the toilets or sinks which would kill the bacteria. <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 />