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Soil Suitability Nitrate Loading Study 1rerr�con Recreation Vehicle Service Facility ■ Lockeford, CA April 12, 2017 Terracon Project No. NA177006 Leach LeachSeepage Pit Address Date Permit Te Tank Size Line Line yp (Gallons) Length (Quantity, Quantity Depth, Size) (Feet) 12101 E. Brandt Rd 1979 Septic New --- --- --- --- 12101 E. Brandt Rd 1984 Septic New 1,200 --- -- (3)25'x 3' 12101 E. Brandt Rd 1984 Septic — --- --- (3) 25'x 3' 12101 E. Brandt Rd 1984 Septic Repair — -- (3) 25'x 3' 12101 E. Brandt Rd 2000 Septic Repair — 3 40 (6) 25'x 42" Based on a review of the EHD permits, the septic systems in the area appear to utilize standard C3 leach lines and seepage pits. Leach lines are 40 feet in length and seepage pits are 25 feet deep by 3 feet to 4 feet wide. 1.3.6 Septic Repair Permit History in the Vicinity Based on the EHD file review, septic repairs in the vicinity appear to be for addition of leach lines and seepage pits. The septic permits are located in Appendix C of this report. 1.3.7 Expected On-Site Maximum Septic Tank Usage According to Mr. Larry Woods, site owner, we understand that the project will consist of an approximately 4,875 square foot re-en In_ d steel framed building used as an RV repair facility and will includ one restroo i no showe he restroom will service a maximum of 2 permanent employees per ay; with up to or the facility will be open between eight hours per day,five days per week year round. The restroom should utilize low-flow toilets and the septic system design should be based on the San Joaquin County On-Site Wastewater Disposal Standards or other engineering recommendations. Based on a useage of 15 gallons per person per 8 hour shift as specified in San Joaquin County EHD Onsite Wastewater Disposal Standards and the proposed usage. The facility will have an average maximum daily usage of 25 gallons per day based on the 5 day work week (15 gallons per day per person for 2 persons working 8 hours per shift and 1 visitor at 5 gallons per day per person. 1.4 Groundwater Information 1.4.1 Groundwater Depth and Gradient Groundwater was not encountered in the shallow percolation test boring excavated to a depth of 42 inches bgs on March 9, 2017 or in the deep percolation test boring excavated to a depth of 25 feet bgs on March 23, 2017. According to the San Joaquin County Flood Control and Water Conservation District Groundwater Report (SJCWCD) Spring 2015, groundwater depth is anticipated between approximately 110 to 120 feet bgs. Based on a review of the SJCWCD Lines C J of Equal Elevation of Groundwater Spring 2015 map, groundwater flow gradient is generally to the south. The groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other Responsive■ Resourceful ■ Reliable 6