COMPLIANCE INFO_1989-1996 - Laserfiche WebLink

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INFORMATION SHEET CITY OF STOCKTON AUSTIN ROAD LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY The City of Stockton presently owns and operates a Class II\i waste disposal site in Section 3, T1S, R7E, MDB&M. This is approximately six miles southeast of Stockton, on Austin Road. The site consists of approximately 180 acres; 135 of which are north of the North Fork of South Little Johns Creek, and 45 of which are south of the creek. Operations began around 1955. The landfill accepts municipal solid waste from the City of Stockton. The site is currently accepting more than 350,000 cubic yards per year from commercial haulers in the City of Stockton. The City has accepted, on a one-time basis, approximately 20,000 cubic yards of digested sewage sludge from the City's wastewater treatment plant in 1989, and will accept approximately 5,000 cubic yards of this sludge on a yearly basis. The sludge is currently being stockpiled at the landfill . The sludge will either be used in the foundation layer of the final cover, or will be placed in a monofill separate from the municipal waste. The first water bearing formation is approximately 70 feet below the base of the landfill , with the hydraulic gradient to the north/northeast. The beneficial uses of this groundwater are domestic, municipal , and agricultural . The facility receives an average of approximately 14 inches of precipitation per year, with the 100-year, 24-hour precipitation event of 6.17 inches. Pacific Energy Inc. operates a methane gas recovery system under contract with the City of Stockton. The power plant contains an 1100 horsepower, gas fired, internal combustion engine which drives an 800 KW induction generator. The power plant can produce up to 760 kilowatts per hour of electrical power, which is sold to Pacific Gas and Electric under a long term contract. The system has an estimated life of 15 to 20 years. Condensate from the system is returned to Austin Road Landfill via a leach line placed at the upper trash/fill interface. A Solid Waste Assessment Test was performed at the facility as required by Water Code Section 13273. The results of the test show that there has been a significant water quality impact to the ground water. Volatile organic compounds were found in the down gradient monitoring wells. This was confirmed with further sampling. Supplemental sampling results indicated that volatile organics were detected in California Youth Authority (CYA) wells CYA-1 and CYA-2 at levees equal to or slightly above action levels. However, confirmation sampling of the CYA wells did not detect any volatile organics. Sampling at a private well at 8106A Austin Road did find volatile organics, and this was confirmed by further sampling. This well is no longer being utilized for drinking water.