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STATE OF CALIFORNIA PE:E WILSON, Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD k ' CENTRAL VALLEY REGION CCFIVED 3443 ROUTIER ROAD, SUITE A SACRAMENTO, CA 95827-3098 APR 2 4 1992 PHONE: (916) 361-5600 FAX: (916) 361-5686 --NVI RON MENTAL HEALTH OERMIT/SERVICES 23 April 1992 Mr. Tom Horton Solid Waste Manager Department of Public Works San Joaquin County 1810 E. Hazelton Avenue Stockton, CA 95201 STORNVATER MMAGEMENT, NORTH COUNTY SANITARY LANDFILL, SM JO IN COUNTY (CASE# 3161) On 6 March 1991, I conducted a staff inspection in response to complaints by the Department of Fish and Game (DFG) that North County Sanitary Landfill 's (County) stormwater discharge was causing siltation problems in South Paddy Creek and that stormwater which had contacted or percolated through the wastes in the landfill was also being discharged into South Paddy Creek. I met Lori Oldfather and John Stark, DFG, who explained what measures DFG had previously requested the County take in order to prevent the siltation problems. Although several major storm events had already occurred in recent weeks, the County did not begin implementing the requested measures until the week of this inspection. During the inspection, it started raining and it was clear why the measures were necessary because a significant amount of stormwater flowed into the north stormwater basin prior to discharging into South Paddy Creek. Next, Mr. Stark pointed out the pump and hoses used by the County to pump water from inside the landfill module into a stormwater basin adjacent to the south side of the module. Ms. Oldfather explained that stormwater from this basin went through a series of basins prior to being discharged from the north basin into South Paddy Creek. Ms. Oldfather stated that DFG was concerned that stormwater which had gone through the waste in the landfill had commingled with other site runoff. This combined runoff, which is being discharged into South Paddy Creek, may be carrying volatile organics, metals, and pathogens which could be toxic to downstream biota. After the inspection, we contacted Gabe Karam and instructed him to do the following: 1) complete all items requested by DFG to prevent siltation problems in South Paddy Creek; 2) sample all water currently in the stormwater basins to determine if volatile organics are present; 3) collect and dispose of all stormwater runoff inside of Module 1 at a local wastewater treatment plant; and 4) submit a stormwater and leachate disposal plan.