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Soil Suitability / Nitrate Loading Study 1rerracon <br />Ehlers Property Lodi, California <br />May 13, 2021 Terracon Project No. NA217019 <br />2.4 Discussion of Nitrate Loading Results <br />2.4.1 Total Nitrate Impact <br />Based on the method and assumptions described, the result of the nitrate loading balance (4.2 <br />mg/L N) indicates that the development on the parcel is not anticipated to cause a buildup of <br />nitrates in the aquifer above the MCL. <br />2.4.2 Methods of Mitigation <br />Based on the nitrate loading results, mitigation measures appear unwarranted. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The site is currently developed with a grain processing facility. The existing warehouse is <br />proposed to be used as a hemp processing facility. The existing grain silos, and grain drying <br />elevator will continue to be operated for non -hemp grain processing. <br />The maximum daily flow rate for the grain operations is approximately 93.75 gpd. The proposed <br />hemp operation is anticipated to add approximately 127.50 gallons of effluent per day for a <br />combined maximum daily flow rate of approximately 221 gpd for the facility. <br />The facility is currently equipped with a 1,200 -gallon septic tank and one 100 foot long leach line <br />which appears adequate based on the proposed maximum usage rate. <br />Based on the results of Terracon's field work, site soils consisted primarily of silty sand and <br />percolation test results (8.92 and 25 minutes per inch), indicate the soils within the existing <br />sewage disposal area appear suitable for a standard septic system. <br />Groundwater was encountered at approximately 5.5 feet bgs in our soil profile boring. 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 />Two groundwater samples were collected from the domestic well. Nitrate as N was reported at 14 <br />mg/L slightly above the MCL of 10 mg/L-N. DBCP was reported laboratory reporting limits of <br />0.010 micrograms per liter pg/L. <br />Based on the nitrate loading balance, nitrate levels for the existing grain facility land use is 2.4 <br />mg/L-N below the MCL of 10.0 mg/L-N. The proposed hemp facility is anticipated to increase <br />Responsive Resourceful Reliable 16 <br />