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Soil Suitability / Nitrate Loading Study ierracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> Table 4. <br /> Proposed Commercial On-Site Maximum Septic Tank Usage <br /> Average <br /> Effluent Maximum <br /> Proposed Average Septic Tank <br /> Shift Number of Quantity per <br /> Septic Shift Hours Shift Times Employees Employee Usage <br /> System <br /> per shift <br /> (gpd) (gpd) <br /> I Shift 1 10 8:00 AM - 6:00 PM 20 18.75 375 <br /> Total Maximum Daily Flow Rate for Proposed Septic System 1 375 <br /> Note: (gpd) = Gallons per day <br /> 1.4. Groundwater Information <br /> 1.4.1. Groundwater Depth and Gradient <br /> Groundwater was not encountered within our soil profile boring which were hand <br /> augered approximately 10 feet below ground surface (bgs). Groundwater was not <br /> encountered in our percolation test borings which were advanced between approximately <br /> 3.0 and 10 feet bgs. According to the California Department of Water Resources <br /> Sustainable Groundwater Management Act (SGMA) Data Viewer, depth to groundwater <br /> was reported approximately 25 feet bgs in Spring of 2023. According to the Department <br /> of Water Resources (DWR) Water Data Library, a well located approximately 1.00 mile <br /> southeast of the site had historic depth to groundwater levels ranging from 22.5 feet bgs <br /> to 28.9 feet bgs, another well located approximately 1.00 mile south of the site had <br /> historic depth to groundwater levels ranging from 11.0 feet bgs to 17.8 feet bgs. <br /> The groundwater flow direction and the depth to shallow, unconfined groundwater, if <br /> present, would likely vary depending upon seasonal variations in rainfall and other <br /> hydrogeological features. Without the benefit of on-site groundwater monitoring wells <br /> surveyed to a datum, groundwater depth and flow direction beneath the site cannot be <br /> directly ascertained. <br /> 1.4.2. Potential Groundwater Contamination Issues <br /> Potential groundwater contamination can occur from a number of sources including <br /> historical petroleum hydrocarbon use, agricultural activities, dairies, septic systems, and <br /> storm water infiltration. As per EHD requirements nitrate as N and 1,2-dibromo-3- <br /> chloropropane (DBCP) have been included as part of the SSS discussion. Identifying <br /> potential groundwater contamination other than nitrates and DBCP is beyond the scope <br /> of work for this report. <br /> Facilities I Environmental I Geotechnical I Materials 7 <br />