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Soil Suitability/ Nitrate Loading Study Ripon Winery Proposed Warehouse ■ Ripon, CA erracon January 20, 2017 ■ Terracon Project No. NA167059 3.0 CONCLUSIONS AND RECOMMENDATIONS In summary, percolation rates meet the minimum EHD standards at a depth of 3.0 feet bgs in the proposed septic leach field area. The parcel appears suitable for the use of a standard septic system utilizing shallow leach lines designed for the intended usage. As indicated, septic pits (if opted as a secondary infiltration measure) may be installed at the end of the leachlines given the presense of the clay and hardpan layer. The foregoing investigation and percolation test results indicate the site consists of surface silty sand where leach lines may be utilized, however as indicated, the area is known for subsurface clay statum and hardpan. For this reason, even though not required, seepage pits may be installed at the end of the leach lines as secondary absorption measure. All final septic system construction should follow the San Joaquin County On-Site Wastewater Disposal Standards where applicable. Based on the method and assumptions described, the results of the nitrate loading balance indicated that the proposed development at the site should not pause a buildup of nitrates in the aquifer above 10 mg/L-N. J\ The San Joaquin County Environmental Health Department did not require a physical water sample to be tested (Refer to Section 1.4.3). 4.0 LIMITATIONS Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. Responsive■ Resourceful ■ Reliable 16