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California R flonal Water Quality gntrol Board �. Central Valley Region u Steven T.Butler,Chair Gray Davis Winston H.Hickoz Governor' secretaryfor Sacramento Main Office Environmental Internet Address: httpJhaww.swrcb.ca.gov/—rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95927-3003 Phone(91 6)255-3000•FAX(91 6)255-3015 3 September 1999 ' r ' `� r�'l` 1 F�,CIUTY FILE CA 0 OPY {?r"GI"IALTQ FILE# — --opo P ST I ® Iwo Mr.Mike Miller ),.; 1�i1 T TED BY DATE R IS Department of Public Works C-Py TO ---_—_ City of Stockton COPY TO 425 N. El Dorado Street COPY TO Stockton,CA 95202-1997 CITY OF STOCSTONAUSTIN ROAD LANDFILL,SAN JOAQUIN COUNTY(CASE NO. 2148). Enclosed are copies of recent inspection reports for your facility.Repairs to the slope on the northeast side of the landfill and many erosion control and drainage improvements were made over the past year. These features should improve the landfill's wet weather performance this winter. However, several areas of concern remain at the landfill. These concerns include maintenance of the southern perimeter drainage channel,perimeter road improvements, stream channel erosion,low areas on the landfill's top deck, and the adequacy of interim cover soil. I understand that the facility's wet weather operations plan is currently being drafted and will be submitted in late September. If these concerns are not addressed in the plan and corrected promptly,the City may violate the facility's Waste Discharge Requirements (WDRs)Order No. 96-175 during the upcoming rainy season. The perimeter drainage channels are intended to convey storm water from the landfill to the storm water pond at the west end of the landfill. The ditch along the southern perimeter of the facility is not graded to drain over the entire length of the channel. This results in ponded water along the channel that must be pumped to the storm water pond or risk overflow into the nearby North Fork of South Littlejohns Creek. Discharge Specification B.10 in Order No. 96-175 requires that: "Precipitation and drainage control systems shall be designed, constructed and maintained to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 100-year,24-hour precipitation conditions." In addition,Discharge Specification B. 12 requires that: "Annually,prior to the anticipated rainy season,any necessary erosion control measures shall be implemented,and any necessary construction,maintenance,or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding of the site and to prevent surface drainage from contacting or percolating through wastes." The City is also required to comply with the Standard Provisions and Reporting Requirements referenced in Provision D. 1 of the facility's WDRs.The Standard Provisions require that: California Environmental Protection Agency o�Recycled Paper