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EFC 51462 01 tUnTirst Stockton September 2_4 2004 <br /> SJCEHD-Emergency Response, City of Stockton Public Works, and California Department of <br /> Fish and Game(CDFG) <br /> Upon EEC's arrival onsite, EEC observed a layer of black oil covering the rain water that <br /> accumulated onsite Photographs of the oil release are included in Appendix F EEC determined <br /> that immediate response actions were necessary to prevent the oil from entering the city storm <br /> drains, sewer systems, and delta's With verbal concurrence from SJCEHD and CDFG, EEC <br /> began directing the containment and cleanup of the oily material The response actions are listed <br /> below <br /> • Ramos Environmental Services (Ramos), an emergency response firm, was retained to <br /> begin removing the oil /oil-water mixture Removal of the product was accomplished <br /> ' using two vacuum trucks <br /> • Baker Tanks was retained to provide two 21,000-gallon storage tanks for the temporary <br /> 1storage of removed oil/oil-water mixture <br /> • Berms were created onsite to prevent the flow of oil offsite or into storm drains <br /> Approximately 22,000 gallons of the oil/water mixture was removed over the next 6 hours and <br /> stored in two 21,000 gallon capacity Baker tanks located onsite After the majority of the water <br /> had been removed, the oil ceased flowing At no time during the release event did the water/oil <br /> mixture flow offsite or into the sewer or storm drain <br /> On December 12, 2003, as part of the emergency response effort, source identification <br /> commenced utilizing a backhoe to excavate test pits at the location the leak was observed At a <br /> depth of approximately four feet bgs, a 2,500 gallon capacity underground storage tank (UST) <br /> was encountered (Figure 5) In addition, a pipeline was found to be connected to the tank The <br /> I pipeline terminated approximately five feet to the west Once exposed, the source of the oil <br /> release was visible Fill ports on each end of the UST, which extended to ground surface, had <br /> apparently been sheared off during site grading operations When rainwater accumulated over the <br /> ' UST,the rainwater displaced the oil, causing the oil to flow to the surface <br /> Once the source of the leak was determined, the contents of the tank were removed with the <br /> vacuum truck and placed inside the Baker tanks The fill ports were then sealed with plugs to <br /> ' avoid further rainwater from entering the UST At this time, the SJCEHD verbally stated that the <br /> emergency response actions were complete, and that formal permitting was necessary for the tank <br /> removal <br /> 1 On December 12, 2003, EEC began the permitting process for UST removal with the SJCEHD <br /> and the Stockton Fire Department (SFD), both of whom have jurisdiction for UST removals in <br /> the City of Stockton Removal of the UST is discussed in detail in Section 6 Remediation of <br /> soil impacted by the UST release is discussed in Section 7 <br /> ' A sample of the oil from the tank was collected and submitted to CLS for product <br /> characterization by EPA method 8015 modified for "fuel fingerprinting" Results indicated that <br /> the product was confirmed to be a fuel oil <br /> 8 <br />