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SA N J O A Q U I N Environmental Health Department COUNTY a. Tank cleaning: Verification of tank cleaning conducted to CCR Title 22 section 67383.3(e)(2) standards. b. Tank inerting, if needed: Verification of tank(s) inerted with 30 pounds of dry ice per 1,000-gallon volume to levels that shall preclude explosion, if tank(s) contained a hazardous substance that could produce flammable vapors. c. Tank removal: Witness removal of tank(s). d. Component removal: Witness removal of any applicable piping, sumps, and associated appurtenances. e. ID marking: Verification of tank CERS ID number (as identified above) marked on the tank end(s) using fluorescent spray paint. f. Soil and/or water sampling: Witness all sample collection. Locations and collection methods for all required samples must be approved by the EHD. Soil sample collection must be performed immediately after removal of the tank or piping from the excavation. Groundwater sample collection must be performed immediately after the water enters the excavation or is otherwise encountered. SAMPLING REQUIREMENTS: 5. Sampling must be performed as follows: a. Soil sample collection must be witnessed by an EHD UST inspector. b. Refer to the Central Valley Regional Water Quality Control Board document `GUIDANCE FOR UST SYSTEM REMOVAL CONFIRMATION SAMPLING' in the approved permit packet for required analytical tests and number of samples. c. Soils shall be analyzed in accordance with CCR Title 23 section 2681 for all constituents of previously stored hazardous substances and their breakdown or transformation products. If the checked analytes in the approved packet do not represent all constituents, additional analyses may be required. EQUIPMENT AND DOCUMENTS REQUIRED TO BE ON SITE: 6. The contractor shall provide the following: • Combustible/Flammable gas detector (to verify the lower explosive limit (LEL) atmosphere and oxygen level of tank prior to lifting from excavation) • Adequate number(s) and appropriate type(s) of fire extinguisher(s) • Barriers to secure the area as necessary to minimize traffic and pedestrian interference • Fluorescent spray paint to affix tank identification numbers 7. A copy of the following documents shall be available on site during all tank removal activities: • A copy of this approval letter and the EHD permit approval packet • The approved project Health and Safety Plan • A copy of the fire permit, if one is required by the fire authority having jurisdiction PRIOR TO REMOVAL OF TANK(S): 8. During the time between cessation of hazardous substance storage and completion of permanent closure, the applicable construction and monitoring requirements of CCR Title 23 articles 4 and 5 continue to apply. 2of4