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VALLEV AG RESEAIi. CH JAN 112001 ENVIRONMENT HEALTH PERMIT/SERVICES DATE: January 8, 2001 i V.A.R. Job No: SSS-08.00 FOR: Mr. Glen Levine Levine & Daughter, Inc. 26457 South Banta Road I Tracy, CA 95376 PROJECT: 26457 South Banta Road APN 252-070-04 SUBJECT: SOIL SUITABILITY STUDY ADDENDUM APPLICATION NUMBER: UP-00-18 Reference is made to our Soil Suitability Study dated December 11, 2000, Job Number SSS-07.00. The San Joaquin County Environmental Health Department has requested additional information regarding the above-referenced project. This information pertains to the recently installed septic system for handling the anticipated wastewater flows originating from this project. At the time of our report, the permit to install the septic system could not be found at the Environmental Health Department. Consequently, the construction details were unknown and therefore, certain design parameters could not be addressed. The permit was subsequently found, which is attached to this Addendum and illustrates the design and orientation of the septic system. As noted, the system consists of a 1200 gallon tank, a distribution box and three 100 ft leachlines. The percolation test results for this project indicated surprisingly permeable soil with excellent perc rates for both tests at 6.3 and 7.1 min/in. According to the authoritative Wastewater Engineering: Treatment. Disposal and Reuse (Metcalf and Eddy), these perc rates translate into an assimilation or application rate of approximately 0.8 gal/ft2/day. Using only the floors of each of the leachline trenches as a safety factor, we have: 2 ft' x 100 ft x 3 = 600 ft' of effluent assimilation area. Thus, based on the system as designed and the perc rates obtained, the acceptance would be: 0.8 gal/ft'/day x 600 ftz= 480 gals/day. However, the long-term application rate (LIAR) must be considered and is generally accepted to be 0.5 gals/ft'/day. This occurs after advanced biomat formation. Consequently, the acceptance rate decreases to 300 gals/day. According to the San Joaquin County Public Health Services, Environmental Health Division Sewage Standards, 30 gals must be assigned to each person, per day in an office setting. It is our understanding that four people will be on-site, within the office, Monday through Friday, 8 A.M. to 5 P.M.. Based upon the LTAR and the Sewage Standards Water Use Computation Factor, 10 people could theoretically use the septic system per day (30 gals x 10 people = 300 gals/day), This builds in a safety factor and allows for a percentage of tow truck drivers to also use the system. If there are fifteen trucks with fifteen drivers,then approximately six drivers can use the system without overloading (6 drivers+4 office = 10 people x 30 gals= 300 gals/day). P.O. Box 3794 1 Turlock,California 95381 1 (209) 668-1403 1 Fax (209) 668-2598