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Soil Suitability I Nitrate Loading Study Irerracon <br /> Proposed Commercial Truck Yard ■ Stockton, CA <br /> August 16, 2019 ■ Terracon Project No. NA197053 <br /> Leach Seepage Pits, <br /> Tank Size Leach Line Line Filter Bed <br /> Direction Address Permit# Type (Gallons) Quantity Length width x <br /> (Feet) Length x <br /> Depth(Feet) <br /> 72-229 Repair --- 1 100 --- <br /> 83-381 Repair --- --- 130 --- <br /> 7400 S.EI Dorado St. 12648 New Install 800 1 40 4 x 8 seepage <br /> pit <br /> 20947 New Install 1,200 2 60 <br /> SR0036831 Destruction --- --- --- --- <br /> 22571 New Install 3,600 1 90 --- <br /> 7070 S.Harlan Rd. SR0008917 Repair ___ ___ --- 15 x 4 x 7.6 <br /> filter bed <br /> West 6909S.EI Dorado St. SR0009454 Repair 3,200 --- --- 11 x 20 x 10 <br /> filter bed <br /> NF—No septic permits found, LL—leach lines <br /> Based on a review of the permits, the septic systems in the area appear to utilize 40 to 130 foot <br /> leach lines and/or filter beds or sumps. <br /> 1.3.6 Septic Repair Permit History in the Vicinity <br /> Septic repair permits appear to be for the addition or replacement of leach lines. Septic permits <br /> can be found in Appendix C of this report. <br /> 1.3.7 Expected On-Site Maximum Septic Tank Usage <br /> Mr. Dhillon indicated two full time employees will use the office daily between lam to 7pm. Up to <br /> 8 visitors are anticipated daily. The total maximum daily septic tank usage for the site will be <br /> approximately 100 gallons per day (gpd). Refer to Section 2.3.4 for the calculation. <br /> 1.4 Groundwater Information <br /> 1 .4.1 Groundwater Depth and Gradient <br /> Groundwater was not encountered within our percolation test borings which were drilled between <br /> 3.5 and 4.7 feet below grade surface (bgs). According to the California Department of Water <br /> Resources, Groundwater Information Center Interactive Map Spring and Fall 2018 depth to <br /> groundwater was reported between approximately 20 to 30 feet bgs. Krazan encountered <br /> groundwater at 17 feet bgs during the geotechnical investigation (Section 1.1.2). The <br /> groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would <br /> likely vary depending upon seasonal variations in rainfall and other hydrogeological features. <br /> Without the benefit of on-site groundwater monitoring wells surveyed to a datum, groundwater <br /> depth and flow direction beneath the site cannot be directly ascertained. <br /> Responsive■ Resourceful ■ Reliable 7 <br />