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From: Richard Stiffler Sent: Tuesday, July 5, 2022 8:16 AM To: Young, Holly@Waterboards <Holly.Young@Waterboards.ca.gov>; Taylor, Andrew@Wildlife <Andrew.Taylor@Wildlife.ca.gov>; Casey Sanders <csanders@apexenvirotech.com>; Fred Mitchell <Fred.Mitchell@ponder-env.conn>; Alaniz, John [EHD <ialaniz1@sjgov.org>; Manzo, Elena K. [EHD <emanzo@sjgov.org>; Garcia-Mejia, Gabriela [END <ggarcia-mejia@sjgov.org>; Jeff Marasovich <Jeff.Marasovich@stocktonca.gov>; Deedee Antypas <Deedee.Antypas@stocktonca.gov>; Scott Moss <Scott.Moss@ponder-env.com>; Murphy, John@Waterboards <John.Murphy@Waterboards.ca.gov>; Tom Landwehr <toml@apexenvirotech.conn>; Vincent Blackwood <vblackwood@apexenvirotech.com>; Rodriguez, Ryan@Wildlife <Ryan.Rodriguez@wildlife.ca.gov> Subject: Update on Remediation of Illicit Discharge - Anderson St. and 1-5 Stockton As of Friday, July 1, all sections of the City stormwater system affected by the illicit discharge of petroleum waste including the west and east storm lines and the pump station wet well have been cleaned. The cleaning results have been accepted by the San Joaquin Co. Environmental Health Dept. Photos of the pump station wet well after cleaning are attached. All waste from this cleaning is being temporarily stored in frac tanks located at the City's wastewater treatment facility at 2500 Navy Dr. This waste is pending hazardous waste profiling and other testing as required. The discharge ditch, which is part of the City's stormwater conveyance system, has been partially remediated and is awaiting completion and acceptance of a sampling plan to determine the additional remediation required. Waste solids from the ditch area are currently being stored in soil bins adjacent to the ditch. This waste is pending hazardous waste profiling before being transported for disposal. The City is continuing to investigate the possible source of this illicit discharge. There are 15 parcels containing approximately 20 businesses located in the upstream watershed area near Anderson St. west of the stormwater pump station which are potential contributors. See attached maps. Several of these businesses have already been inspected by City staff. No evidence of either illicit discharges or illegal connections has been determined at this time. The City is developing a schedule to perform more thorough inspections of all 20 businesses. Each business will be closely inspected to determine any suspicious activities. This will include inspections of all onsite stormwater conveyance systems including catch basins, maintenance holes, storm lines, etc. Also, the City will look at all potential areas of illegal connections including floor drains inside buildings, sand/oil separators, wash racks, waste storage areas, etc. Records of waste hauling will also be examined. These inspections are expected to be completed prior to July 15. At this time, the City is televising the stormwater line along Anderson St. to determine any signs of illicit discharges or illegal connections. The CCTV work is expected to be completed this week. If any evidence or indication of any illicit discharges or illegal connections are located during this investigation, a follow-up email will be sent to notify all agencies involved. SS" Richard Stiffler Technical Services Supervisor — Environmental Control City of Stockton — Department of Municipal Utilities 2500 Navy Drive Stockton, CA 95206 Phone: (209) 937-8740 richard.stiffler@stocktonca.gov MUD 4