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UIN SAN JOA COUNTY a %W, <br /> Department of Public Works <br /> �� <br /> Q Fritz Buchman,Director <br /> �q� P Greatness grows here. Working for YOU Alex Chetley, Deputy Director-Development <br /> David Tolliver,Deputy Director-Operations <br /> Najee Zarif,Deputy Director-Engineering <br /> Kristi Rhea,Deputy Director-Administration <br /> October 17, 2023 <br /> Mr. Todd Del Frate, PG <br /> Engineering Geologist <br /> Central Valley California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> SUBJECT: NORTH COUNTY SANITARY LANDFILL- MODULE 4 LEACHATE SPILL 1sT <br /> NOTIFICATION. <br /> Dear Mr. Del Frate: <br /> This letter is provided to fulfil the Waste Discharge Requirements (R5-2010-0016)for reporting <br /> leachate spill at North County landfill. On October 3, 2023, due to an electronic control failure at <br /> Module 4 Sump Panel, approximately 100 gallons of leachate spilled into the drainage ditch west of <br /> the sump from Module 4's tank overnight (Figure1). The spill was contained inside the drainage <br /> ditch and seeped into the soil (Photo 1). No waters of the US were impacted. <br /> Spill notification was emailed to Water Board and to the San Joaquin County Environmental Health <br /> Department (LEA) on October 3, 2023. The LEA provided the state OES's spill hotline contact <br /> information and a spill incident report was made. An electrician diagnosed the electrical failure and <br /> made repairs on October 4th. <br /> County staff delineated the spill extent in the drainage ditch on October 4th and discovered the spill <br /> had extended further north in the drainage ditch. The delineated spill area measurements were <br /> approximately 270 feet long by 6 feet wide. The contaminated soil was excavated and stockpiled on <br /> a tarp at the top of Module 5. Excavation stopped when all visible contaminated soil was removed, <br /> and clean dry soil was visible (Photo 2). Approximately 4,200 cubic feet of contaminated soil were <br /> excavated from the drainage ditch. <br /> On October 10th, one soil sample was collected from the soil stockpile for leachate parameters and <br /> five soil samples were collected from the clean excavated area for VOCs. The samples were <br /> submitted to the lab for analysis and results will be included in the follow-up report. If you have any <br /> questions, please contact me at (209) 753-9516. <br /> Sincerely, <br /> Mark Houghton, P.E. <br /> Senior Engineer <br /> 1810 East Hazelton Avenue I Stockton, California 95205 1 T 209 468 3000 1 F 209 468 2999 <br /> F1 Follow us on Facebook @ PublicWorksSJC Visit our website: www.sjgov.org/pubworks <br />