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January 7,2003 <br /> Job Number:LG02-026 <br /> Page 5 <br /> The percolation test casing set in each boring was an open ended 2-inch PVC pipe with holes <br /> drilled on the bottom. Two inches of "pea gravel"was placed in the bottom of the percolation <br /> test holes, the casing was installed, and several feet of"pea gravel"was backfilled in the annular <br /> space. The presaturation was performed on December 3, 2002. <br /> A 4-hour percolation test was conducted on December 4, 2002 in accordance with the <br /> requirements of San Joaquin County Environmental Health Division. The last '/z hour of the test <br /> was observed by a representative of that office. The result of the shallow (3-foot deep) <br /> percolation test indicated a percolation rate of 14.7 minutes per inch. The result of the deep <br /> percolation test achieved a satisfactory percolation rate of less than 3.8 minutes per inch. <br /> 5.0 SUITABILITY OF EXISTING SEPTIC SYSTEM <br /> As described previously, the existing septic system is composed of two tanks and one disposal <br /> area connected by tight lines. According to a septic system permit dated 11/18/92,the sewage <br /> disposal area is two (2) filter beds, 6.5 feet by 80 feet each. The filter bed area was designed for <br /> 10 to 15 employees. <br /> It is estimated that for the proposed expansion, a maximum of 37 employees and 5 customers <br /> will be on site during a typical 5 day work week. The caretaker residence is a 2 bedroom mobile <br /> home occupied by 1 person. Fifteen(15) gallons per day per person was assigned for the 37 <br /> employees for an industrial building category(no cafeteria) according to the San Joaquin County <br /> Sewage Standards. An estimate of 5 gallons per day per person was made for customers. <br /> According to the text book titled Small and Decentralized Wastewater Management Systems by <br /> Crites and Tchobanoglous 6, 70 gallons per day per person was assigned to the mobile home <br /> occupant. Table 2 presents an estimate of average daily flow for sewage at the proposed facility. <br /> 6 Crites,R.and Tchobanoglous G., 1998,Small and Decentralized Wastewater Management Systems: <br /> McGraw-Hill Publishing Company,Boston. <br /> �pERSO <br /> P 1 <br /> D <br /> Z <br /> O ti <br /> ,SS pC♦ <br /> P <br />