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Sanguinetti Investments,Circle K Project Number: LGS080546 December 17, 2008 The EHD has agreed to permit an alter_na_ti\ie_design which utilizes aerobic-and anaerobic process cse ontained_within.the,trench'Similar;'to an intermediate sand filter systC67 This approach was described in an article published in Environmental Technology (Marseille and Anderson, 2001). The design has the benefit of lower capital cost and low maintenance over the life of the system when compared to a package treatment system. Please refer to the article for details. The approach that Marseille and Anderson (2001) have taken has several;6dv66tages including simpler design,ireadily available carbon'source in-the sandao enhnnce denitrification, lower capital cost, and low maintenance in the long-term. (The"sand bed is..contained.,within thi 'benches and acts like an intermediate sand'.filterdesign. Denitrification is.promoted.in.an anaerobic environment in the bottom of the trenches. An ! initial target goal was set for nitrogen reduction of 50 to 60 percent within soils below the leach line trenches. One existing system permitted in San Joaquin County has shown an average of 60% reduction. Since our.ofFce.-will.monitor:the system for the first year including,taking water 'meter-readings, measuring actual den itrifl cation, and influent concentrations, it will be possible to re-assess the nitrate loading of the site and if a buildup of nitrates in the ground water above 10-mg/L is occurring. The successfGl operation of the septic system will not only depend on the design factors discussed, but will!alsb depend on the`quality.of.the influent entering the system from the two buildings--.--The-septic system,is not designed-to handle.any other-waste stream otherthan_ --residential strength..waste. Strong chemicals and solvents could seriously damage the septic system. Water softener brines are not acceptable for disposal in the septic system. Please call our office or EHD for more information regarding suitable waste streams. Calculating Flow Rates and Septic Tank Volume The site is proposed to have a commercial building and a gas station-convenience store. The average daily flow for the commercial building is estimated to be 475 gallons per day, and the average daily flow for the convenience store and gas station is estimated to be 680 gallons per day. The total average daily flow for the site is estimated to be 11,155 jillons per `day. Based on the limited size and layout of the available septic area, the septic system has been designed to accommodate a limited flow rate. This design does.not.address commercial food:production. Commercial Building The specific use of the commercial building near the northern portion of the property is not yet known. No food service for this building is incorporated into these calculations due to the limited size and layout of the site.COur office°has designed the'septic system fora flow,rate from atypical office building,with Iimited.,water usage. 902 Industrial Way•Lodi,CA 95240.209.367.3701•Fax 209.369.4228 50 Goldenland Cl.,Suite 100 •Sacramento,CA 95834•916.928.4690•Fax 916.928.4697 1190 Burnell Ave.,Suite A•Concord,CA 94520.925.609.7224•Fax 925.609.6324 80 N. West Street•Fernley,NV 89408.775.575.6511•Fax 775.575.2652 02007 Neil O.Anderson&Associates,Inc.