COMPLIANCE INFO_1978-1992 - Laserfiche WebLink

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INFORMATION SHEET CITY OF STOCKTON FRENCH CAMP LANDFILL LIMITED CLASS III LANDFILL SAN JOAQUIN COUNTY The City of Stockton owns and operates the French Camp Landfill. The landfill is located at Manthey Road, 2 miles south of Stockton along Interstate 5 in San Joaquin County. The landfill has no waste discharge requirements at present but operates under a permit issued by the San Joaquin Local Health District and the California Integrated Waste Management Board. These requirements establish waste discharge requirements for the landfill in accordance with requirements of Chapter 15, Title 23 of the California Code of Regulations, governing discharges of waste to land. Operations commenced at the French Camp Landfill in 1938. The site was used as a burn dump and accepted Groups 2 and 3 wastes from the City. Since 1957, however, the French Camp site has only been used for the City's demolition and garden wastes. The 72 -acre site currently receives an average of 80 tons per day of these wastes but the City projects that the waste stream could potentially increase up to 413 tons per day given expected community growth and assuming no recycling. The site could accommodate an additional 1.45 million cubic yards of waste and provide a service life approaching 20 years. The landfill is within the eastern reaches of the Sacramento/San Joaquin Delta. It is bordered on the north by Walker Slough and on the south by French Camp Slough. The sloughs join immediately west of the site and flow 1 mile west to the San Joaquin River. The native materials below the refuse consists of inter bedded sequences of silty, sandy clays, clayey sands and silty sands. Ground water was first encountered within native materials at a depth of 45 in Well MW -2 and 34.5 feet in Well MW -3. Refuse was encountered in Boring MW -1 to a depth of 37 feet, which is approximately 4 feet below first encountered ground water. It is suspected that this portion of the southern portion of the landfill may have been the original course of the French Camp Slough with was filled with refuse during the early development of the landfill. The ground water gradient is to the northeast, away from the sloughs, and towards a regional ground water depression created by historic and long-term pumping of groundwater by the City of Stockton. A verification monitoring program confirmed the presence of VOC contamination in water from MW -1 . It is alleged that the VOC impact is due to historical waste disposal since the current waste stream is restricted to landscape debris. VOCs were not detected in water from the three downgradient wells (MW -2, MW -3 and MW -4) and in a city well in proximity to the landfill; however, an evaluation monitoring program, pursuant to Article 5, Chapter 15 and as specified in this Order, will be required to investigate this matter and implement appropriate remedial action.