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Soil Suitability /Nitrate Loading Study Irerracon <br />Thornton Road Trailer Parking Facility ■ Lodi, California <br />December 15, 2021 ■ Terracon Project No. NA217079 <br />inch and 6.85 minutes per inch. The deep boring demonstrated a percolation rate of 17.85 minutes <br />per inch. All percolation test borings advanced at 3, 3.5, and 6.3 feet bgs demonstrated <br />satisfactory percolation rates for standard shallow leach lines and/or deep seepage pits. <br />A groundwater sample was not collected because no wells were located on site and groundwater <br />was not encountered during Terracon's field work. <br />The maximum daily flow rate for the proposed Trailer Parking Facility operations is approximately <br />106.25 gallons of effluent per day. Based on the nitrate loading balance, nitrate levels for the <br />proposed development are anticipated to increase nitrate levels to 2.7 mg/L-N for the project area. <br />The result of the nitrate loading balance indicates that the development is not anticipated to <br />increase nitrate levels above the MCL therefore nitrate mitigation is not recommended. <br />In summary, the parcel appears suitable for the proposed development. The septic system design <br />should accommodate peak flows and follow the San Joaquin County OWTS standards where <br />applicable. <br />4.0 LIMITATIONS <br />As indicated, our study takes into account the subject property only with the sewage load applied <br />over the property site area. The study does not take into account surrounding properties and/or <br />lands. The method utilized for the nitrate loading analysis is based on a simple mass balance <br />formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br />convenient and simplified method to estimate long-term groundwater nitrate impacts on an area - <br />wide basis. A more detailed analysis was not requested nor intended. <br />Our professional services were performed, our findings obtained, and our conclusions proposed <br />in accordance with generally accepted engineering principles and practices. This warranty is in <br />lieu of all other warranties either expressed or implied. Test findings and statements of <br />professional opinion do not constitute a guarantee or warranty, expressed or implied. <br />Responsive ■ Resourceful ■ Reliable 16 <br />