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W Z4� w . <br /> -10 J <br /> ❑ October 13, 2020 <br /> FOR: San Joaquin County Environmental Health Department <br /> Mr. Muniappa Naidu, REHS, EHD Assistant Director <br /> Mr. Steven Shih, REHS <br /> 1868 Hazelton Ave. <br /> Stockton, CA 95205 <br /> Mr. and Mrs. Javier and Janet Leon <br /> 484 Pestana Ave. <br /> Manteca, CA 95336 <br /> 209-923-7496 <br /> PROJECT: Proposed Single Family Modular Residence <br /> 228 West Klo Road (Address for Subject Property) <br /> Lathrop, CA 95330 <br /> APN 191-240-18; 1.61 Acres <br /> SUBJECT: Onsite Wastewater Treatment System (OWTS) Design and Operational Parameters <br /> Project Number SSD-10.20C <br /> INTRODUCTION <br /> Chesney Consulting has been retained by Mr. and Mrs. Leon to mitigate nitrate loading from their <br /> proposed modular residence that was calculated to be in excess of allowable standards. Two <br /> previous design iterations were proposed for this project. Due to a number of factors, it has been <br /> determined by EHD that a pressurized effluent delivery system is warranted for this project. This <br /> document outlines a low pressure piping (LPP) system that is much more cost effective and reliable <br /> than a high head effluent pump (HHEP) system that has small diameter laterals and orifices. <br /> OWTS OPERATIONAL DESIGN PARAMETERS <br /> The following describes the simplistic design to achieve a relatively high degree of equal <br /> distribution of effluent: Beginning with the septic tank, a 1.600 gallon tank is specified to provide <br /> additional nitrogen retention in comparison to a 1,200 gallon tank. The influent line from the <br /> modular home will connect to the tank that is to be installed so that the top of the tank is four <br /> inches above existing grade. This will ensure that an 8 ft separation distance is maintained <br /> between the soil-effluent interface and the highest anticipated depth to groundwater, which is 10 ft. <br /> Effluent will gravity flow from the septic tank that has an effluent filter at the outlet, into a pump <br /> chamber tank. A duplex sewage pump system is to be installed in the pump chamber tank, with <br /> the pumps connected to a Duplex Control Panel. <br /> Page 1 of 2 <br /> P.O. Box 3794 0 Turlock, CA 95381 ❑ 209.402.1652 Ll ddchesney(a charter.net <br />