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n <br />Fcbruary 8, 2018 <br />FOR: Mr. Rodney Estrada, REHS <br />San Joaquin County Environmental Health Department <br />1868 East Hazelton Ave. <br />Stockton, CA 95205 <br />Mr. Bjorn Ervell <br />ZipCubes Equipment Management <br />One Avenue of the Palms, Suite 311 <br />Treasure Island <br />San Francisco, CA 94130 <br />PROJECT: ZipCubes Storage Facility <br />7777 West 11th Street <br />Tracy, California 95304 <br />APN: 250-140-11 <br />SUBJECT: Change in Septic System Design. <br />Reference is made to the project above. My original design of the wastewater treatment and <br />disposal management (septic) system included a duplex pump to pressurize effluent for disposal <br />into a 10 ft x 80 ft filter bed. Effluent pressurization was the original design of choice since all <br />applicable elevations could not be determined without significant subsurface intrusion, and the <br />assumption that insufficient grade existed to gravity flow the effluent to the leachfield. <br />It has subsequently been determined after uncovering surrounding concrete cover that there is <br />sufficient fall -in -grade for effluent to be disposed of by gravity. Consequently, the design will <br />now consist of a tightline from the septic tank to a manifold/distribution box configuration to <br />equally distribute the effluent through three perforated laterals running the entire length of the <br />filter bed. These laterals are to run level with capped ends to force effluent to be equally <br />distributed over the soil -effluent interface of the filter bed. <br />If there should be any questions regarding this change in design, please contact me. <br />Respectfully submitted, <br />CHESNEY CO SU:G <br />4 <br />Don Cheshey, PE <br />Registered Civil Engineer C75479 <br />No. 75A79 <br />* <br />a Civil <br />J'f <br />to <br />Of CaI to't <br />P. 0. Box 3794 • TurCock, C -A 95381 •Office (tog) 668-1403 • Fax (tog) 668-2598 <br />