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Soil Suitability/Nitrate Loading Study Irerracon <br /> Vacant Commercial Property■ Stockton, California <br /> December 7, 2018 ■ Terracon Project No. NA187056 <br /> 1.3.7 Expected On-Site Maximum Septic Tank Usage <br /> According to Mr. Le, up to 400 p�shioners are anticipated to use the proposed church facilities <br /> weekly. Mr. Le indicated a sanctuary will be used Monday through Saturday for a single Mass <br /> service and Sundays for two services. Mass services were assumed to be approximately one <br /> hour. The youth center building will be used on Saturdays for bible study and the social hall <br /> w/kitchen will be used approximately two times per month. Mr. Le indicated up to three special <br /> events are anticipated annually. The following table was compiled based on a review of the site <br /> plan provided by Mr. Le: <br /> Table 4. <br /> Proposed Site Usage. <br /> Usage <br /> BuildingApproximate Maximum <br /> Square Per Number of Toilets Sinks Urinals <br /> Identification Occupancy* year Restrooms <br /> Footage <br /> (days) <br /> Main <br /> Sanctuary 7,000 NE 365 3 6 5 2 <br /> Social Hall 6,000 NE 24 2 2 2 0 <br /> w/Kitchen <br /> Youth Center <br /> w/10 6,150 NE 52 2 5 5 2 <br /> classrooms <br /> `Note:Maximum occupancy per building was not established(NE) <br /> Based on the San Joaquin County Onsite Wastewater Treatment Systems Standards (EHD 42- <br /> 014) dated January 2017, a proposed usage rate will be calculated at 10-gallons per person per <br /> seat for churches with kitchens. According to Mr. Le, the property wil <br /> parking spaces with an average of three people allotted per space for a maximum occupancy of <br /> X600 people. Terracon used this maximum occupancy to calculate the maximum onsite septic tank <br /> usage of 6,000 gallons per day(600 people x 10-gallons per person). If the occupancy is different <br /> from what has been initially anticipated, our office shall be contacted to revise our calculations. <br /> 1.4 Groundwater Information <br /> 1.4.1 Groundwater Depth and Gradient <br /> Groundwater was not encountered in our percolation test boring (131)excavated to a depth of 3.5 <br /> feet below grade surface (bgs)or deep boring (132)excavated to a depth of 25 feet bgs. According <br /> to the San Joaquin Flood Control—and--Water--,C—onse-rvation-Dis r c–G-oundwafer Reports, <br /> groundwater depth and elevation maps dated Fall 2015 to Spring 2016, depth to groundwater lies <br /> between approximately 80 and 90 feet bgs. The groundwater flow direction and the depth to <br /> Responsive ■ Resourceful ■ Reliable 8 <br />