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r WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0225 ALPINE PACKING COMPANY,INC. 5 WASTEWATER TREATMENT SYSTEM, SAN JOAQUIN COUNTY Elec. Cond. TDS Na Cl NO3 as N TKN Well Date os/cm m1 m1 m 1 m 1 m 1 MW-2 718102 1,460 970 64 99.9 12.2 <0.5 MW-3 11/29/01 1,862 270 120 110 <.5 1.3 MW-3 4123102 1,400 925 114 90 29.5 <0.5 MW-3 7/8102 1,600 1,086 120 74.9 30.8 <Q.5 MW-4 11/29/01 1,548 290 86 86 <0.5 0.3 MW-4 4/23102 780 485 42 32 14.2 <0.5 MW-4 718/02 Well was dry. ND denotes Not Detected; detection limit shown in parentheses. 26. As indicated in the table above, based on the sample events, it appears the TDS concentration in the groundwater below the current land treatment unit may be three times higher than that of the groundwater upgradient of the land treatment or wastewater storage areas. Concentrations of sodium and chloride may be higher in wells downgradient of land treatment units or wastewater storage locations. This data, coupled with the reported groundwater gradient to the southwest, indicates that groundwater below the land treatment unit may be impacted by the discharge of wastewater from the facility. 27. The Discharger has stated that groundwater conditions are the result of previous activities at the site when animals were slaughtered and more wastewater was generated. Staff recognizes those conditions but the quality of wastewater presently discharged is worse than the site groundwater quality and therefore some degradation may be due to current activities. Because the groundwater data obtained to date contains some anomalies, this Order requires the Discharger to install additional groundwater monitoring wells and to conduct groundwater and vadose zone monitoring to fully determine whether the discharge is degrading the groundwater. 28. The facility is served by two water supply wells. The primary supply well extends to a depth of approximately 300 feet below ground surface (bgs); the secondary supply well is estimated to be approximately 110 feet bgs. No information on the screen interval was provided in the RWD. 29. The irrigation well locations are located on-site. The wells were sampled on 26 June 2002. The wells produce good quality water as indicated by the sample results presented below: Constituent Units North Irrigation Well South Irrigation Well Calcium mg/l 69 78 Magnesium mg/1 24 30 Potassium mg/l 5 4 Sodium mg/l 19 25 Bicarbonate mg/l 280 350 Sulfate mg/l 18 29 Chloride mg/l 53 40 Nitrate as N mg/l 4.6 7,6 pH Std. 7.6 7.4 Elec. Conductivity gmhos/cm 662 755