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California41r-gional Water Quality Control Board Central Valley Region Qa; Karl E. Longley,ScD,P.E.,Chair Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold Secretary for Phone(916)464-3291 •FAX(916)4644645 % ' Schwarzenegger Environmental ; Governor http://www.waterboards.ca.gov/centralvalle \j1\CJ Protection J c% 10 June 2009 T\21 \11� W. Michael Carroll San Joaquin County Dept. of Public Works Solid Waste Division P.O. Box 1810 Stockton, CA 95201 NOTICE OF VIOLATION, FOOTHILL SANITARY LANDFILL, SAN JOAQUIN COUNTY The Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff was notified by the San Joaquin County Public Works Department (Discharger) in a letter dated 9 April 2009 that the LFG gas condensate-line was incorrectly plumbed-to-the 12-inch diameter secondary sump riser pipe instead of the 4-inch diameter primary leachate collection and removal system (LCRS) riser pipe. Based on the 9 April 2009 letter describing the incident, the Discharger indicates the volume of the gas condensate delivered to the secondary sump exceeded its volume, thus allowing the liquid to fill the secondary sump and sump riser pipe to an elevation over 220 feet mean sea level (MSL). The Discharger concludes that pressure from liquid in the secondary sump ruptured an extrusion weld above the secondary sump riser pipe where the pipe penetrated the primary liner. Once ruptured, the gas condensate liquid flowed along the primary sump liner and into the primary sump. The Discharger excavated around the riser pipe down to an area where the extrusion weld was located and where saturated soil was eventually observed. No other saturated soil was observed during the excavation and the Discharger concluded that the gas condensate liquid was released into the primary sump at this point. The membranes where the welds were ruptured.were not observed since it was covered by geocomposite material. Based on the information provided in the 9 April 2009 letter, the Discharger plans to perform several actions including: 1. Remove the condensate from the secondary sump. 2. Attach the discharge from the LFG condensate line to the primary LCRS riser as originally intended. 3. Replace the soil over the exposed pipe and proceed with normal refuse disposal activity. According to the Discharger's plan, the separation between the membranes where the extrusion weld ruptured is high up the side of the cell so the opportunity for leachate to enter the secondary sump is minimal. CIWQS VID#818644 California Environmental Protection Agency ca Recycled Paper I