COMPLIANCE INFO_1993-1996 - Laserfiche WebLink

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INFORMATION SHEET CITY OF STOCKTON FRENCH CAMP LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY The City of Stockton owns and operates the French Camp Landfill. The landfill is at Manthey Road, 2 miles south of Stockton along Interstate 5 in San Joaquin County. The landfill is currently regulated by WDR Order No. 92-225, which are no longer in conformance with Chapter 15 regulations. The monitoring program for ground water and surface water does not satisfy the requirements outlined in Article 5 of Chapter 15. This new Order satisfies the requirements in Article 5 of Chapter 15. Operations commenced at the French Camp Landfill in 1938. The site was used as a burn dump and accepted non-hazardous municipal 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 cubic yards per day of these wastes. 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 approximately one mile west to the San Joaquin River. The native materials below the refuse consist 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 34 feet. Refuse was encountered at 4 feet below ground water level in well MW-1. It is suspected that this portion of the southern part of the landfill may have been the original course of the French Camp Slough, which 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 ground water 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 garden wastes. VOCs were not detected in down- gradient wells.