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WASTE DISCHARGE REQUIREMENTS ORDER NO. 4 WILLIAM LONG, SCOTT LONG, AND LONG RANCH, INC. SAN JOAQUIN COUNTY The facility lies within the 100-year flood plain. The Discharger has constructed dikes in the past to prevent inundation of the facility during periods of excessive runoff. Stormwater runoff from the covered confinement areas, barns, and metal buildings drain to a pipeline which conveys the runoff to a drainage ditch managed by the Reclamation District 2075. The _ Discharger submitted a Notice of Non-Applicability of coverage under the National Pollutant Discharge Elimination System General Permit for discharges of stormwater. The water supply for the ranching and slaughterhouse operations will be from a well located near the southeastern corner of the facility. The supply well was drilled to 198 feet below ground surface (bgs) and is screened from 178 to 198 feet bgs. Depth to groundwater in the supply well was 8 feet bgs, as reported on the well log. Regional information suggests that the groundwater flow direction may fluctuate seasonally, based on the proximity of the site to the San Joaquin River. Analytical results of groundwater samples collected from the water supply well, as reported in the RWDs, had 558 and 550 mg/1 of Total Dissolved Solids (TDS), and 108 and 21 mg/1 of and Nitrate. Analytical results for other general mineral compounds were provided in the amended RWD. A Nitrogen stable isotope ratio analysis for Nitrate (515N) was also conducted to determine the possible source of the high Nitrate in the groundwater from the supply well. Analytical results for 615N were reported to be 9.8, which suggests an animal source, rather than an organic source. Depth to shallow groundwater is approximately 18 feet bgs, and the flow direction was calculated to be northeasterly based on three soil borings installed for the RWD. Analytical results of the shallow groundwater in one of the borings were reported to be 1034 mg/1 and 114 mg/1 of TDS and Nitrate, respectively. Shallow groundwater quality should not be impacted by the expanded processing operations. The process wastewater is of equivalent or better water quality than the shallow groundwater. The driller's log indicates that soil in the upper 16 feet of the subsurface is predominately composed of top soil and clay; however, the RWD reported the soil type as a silty sand to sand with 6 to 12 percent clay and no gravel. The predominate soil type in the upper soil horizon was determined to be generally deficient in clay (i.e. less than 10 percent). Analyses of several shallow soil boring samples (maximum of 2 feet deep) were reported to contain the following compounds: Concentration Range Compound In Milligrams per Kilogram (mg/kg) Nitrate as Nitrogen 2.1 — 10.7 Phosphate as Phosphorus 3.1 — 64.6 Potassium 48 — 105