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WASTE DISCHARGE REQUIREMENTS -4- <br /> FOR <br /> 4_FOR CITY OF STOCKTON <br /> AUSTIN ROAD LANDFILL FACILITY <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> .24. The Discharger has implemented a periodic load checking program which consists of daily <br /> random checks of incoming loads. Signs, pre-notification programs, and procedures for <br /> handling identified hazardous wastes have also been developed. <br /> 25. A Solid Waste Assessment Test and Verification Monitoring Plan, dated June 1989 found <br /> significant water quality impacts at downgradient ground water monitoring wells MW-1 <br /> and MW-4. Volatile organic compounds(VOCs)were found in the downgradient wells. <br /> Supplemental sampling results indicated that VOCs were detected in California Youth <br /> Authority(CYA)wells CYA-1 and CYA-2 at levels equal to or slightly above action <br /> levels, in a state agricultural well on the west side of Austin Road, and in a private well at <br /> 8106A Austin Road. However, confirmation sampling results.did not detect any VOCs at <br /> either of the CYA wells. Sampling at the private well at 8106A Austin Road detected <br /> VOCs. The Discharger constructed and sampled monitoring well MW-14 which did not <br /> encounter VOLs. Further investigation is needed to determine whether the pollutants in <br /> the well at 8106A Austin Road are related to the landfill plume. <br /> 26. An evaluation monitoring program was implemented in three phases to determine the <br /> vertical and.horizontal extent of contamination. Phases I and II confirmed VOC impact <br /> along the entire downgradient edge of the landfill and in the first encountered water <br /> bearing zone. In April 1991, Phase III indicated the chlorinated hydrocarbon impacted <br /> ground water extends laterally as far as 1,000 feet downgradient of the edge of the landfill. <br /> 27. A Corrective Action Plan, dated 29 August 1991, was submitted by the Discharger. The <br /> plan describes and involves the following actions: <br /> a. reduction of leaching of chlorinated hydrocarbons into the ground water by checking <br /> incoming loads into the landfill for hazardous materials and implementing measures to <br /> reduc t water infiltration into the refuse; <br /> b. extraction,of ground water from the two wells to reduce the off-site migration of <br /> chlorinated hydrocarbons; <br /> c. installation of a system for treating the extracted ground water prior to discharge; and <br /> d. monitoring the effectiveness of the corrective action and determination of the need for <br /> modifications. <br /> 28. Two ground water extraction wells with a combined design capacity of 305 gallons per <br /> minute(gpm)have been installed to extract polluted ground water. VOCs are stripped <br />