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4f Pete Wilson Cal/EPA March 31, 1998 Governor Peter M.Rooney Secretaryfor California Environmental Environmental Mr. Stephen Chen Protection Protection Deputy Public Works Director Agency City of Stockton 425 N. EI Dorado Street Integrated Stockton,California 95202 Waste Board aa dagemenr SUBJECT: Compliance Status of the Austin Road Landfill, Facility No. 39-AA-0001 8800 Cal Center Drive Sacramento, CA 95826 Dear Mr. Chen: (916)255-2200 www.ciwmb.ca.gov This letter is intended to express California Integrated Waste Management Board(Board) staff's concerns regarding the operation and maintenance of the Austin Road Landfill. The Disposal.Site Inspection Report from Board staffs March 26, 1998 inspection, is attached for your records. Several concerns were observed at the time of Board staff's March 26, 1998 inspection,that the City must address: EXPLOSIVE GASES CONTROL: At the time of the March 26, 1998 inspection,soil gas probes(SGP)-13 and 14 exceeded the regulatory limit of five percent at the northern permitted boundary, 35%and 47%respectively. Stipulated Agreement of Compliance No. 97-77(Stip), Page 2,requires that the City submit a schedule for expanding the existing landfill gas recovery system if concentrations exceed the lower explosive limit for methane in SGPs-13 and 14. The Stip requires that the schedule be submitted within 30 days of detection. Since landfill gas levels were confirmed at the time of Board staffs March 26, 1998 inspection,the City is required to submit the aforementioned schedule by April 27, 1998. Upon receipt of the City's proposed schedule, Board staff will review and provide comments, if any. The Stip also requires that monitoring of the SGPs be conducted on a monthly basis. Results of the monthly monitoring is to be submitted with the quarterly monitoring report. In addition,a letter of Inclusion of the Austin Road Landfill in the Inventory of Solid Waste Facilities Which Violate State Minimum Standards for the ongoing explosive gases control violation is forthcoming. DRAINAGE AND EROSION CONTROL: Erosion on the south facing slope needs to be repaired. The erosion along the southern slope is to the depth of waste in some areas. Currently,most of the site is unvegetated making the soil cover very susceptible to erosion. Plastic sheeting was placed in some of the erosion gullies to help minimize further erosion. Nonetheless, additional measures need to be implemented to divert and control the flow of runoff from the landfill. As a result of the erosion,the perimeter drainage channel along the southern toe of the landfill is filled with sediment which causes runoff/leachate to pond in the drainage channel. .The drainage system is to be designed to ensure the integrity of roads, prevent safety hazards,and prevent the exposure of waste.