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U, <br /> DiETz IRRIGATION <br /> Engineers and Contractors <br /> SERVING AGRICULTURE AND INDUSTRY <br /> CA Lic.#638281 <br /> " EDO <br /> January 11, 2007 +"'' <br /> EP't`/1RONk'TINT HEALTA <br /> San Joaquin County Environmental Health Division <br /> Attn: Mike Huggins <br /> 304 East Webber Ave., 3`1 Floor <br /> Stockton, CA 95202 <br /> Subject. Fourth Quarter 2006 Inspection of MicroSeptec Unit Installed at Carmelo <br /> Business Park, Tracy,California <br /> Dear Mr. Huggins: <br /> The MicroSeptec unit Model SM1200 installed at 7500 Carmelo Avenue, Tracy, <br /> California was sampled on December 28, 2006. The sample results, which are attached, <br /> showed a reading of 50mg/1 of nitrates. This translates to an effluent of 11.3 pm as <br /> nitrogen. The system is now functioning as designed and the effluent is now meeting <br /> design requirements. <br /> An inspection was conducted during December to verify that all elements of the <br /> MicroSeptec system are operating properly. No repairs were necessary. <br /> During the third quarter the system had undergone an out of specification event, which <br /> was documented in the letter dated August 16, 2006. At that time samples were taken <br /> and there was question as to the validity of the results provided by GeoAnalytical <br /> Laboratory. Because of the concern over the validity of the laboratory procedures, split <br /> samples were taken on December 28, 2006. The sample delivered to GeoAnalytical <br /> Laboratory and the sample delivered to Far West Laboratories both were within a <br /> reasonable variation based on either the sample or the laboratory procedures. The data is <br /> - attached from both laboratories. This confirms that the samples previously submitted to <br /> GeoAnalytical Laboratory should be considered valid. The totalizing flow meter reading <br /> was 1155120 gallons on December 28, 2006. <br /> 33233 S. Koster Road • Tracy, CA 95304-9142 • (209) 832-2910 • Fax (209) 833-1288 • Cell (209)482-7769 <br />