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Central Valley Regional Water Quality Control Board 11 June 2025 Stacy Rivera Lead Sr. Registered Environmental Health Specialist 1868 E. Hazelton Avenue Stockton, CA 95205 STAFF REVIEW OF TANK REMOVAL, DAMERON HOSPITAL (T10000023400), 525 ACACIA STREET, STOCKTON, SAN JOAQUIN COUNTY Central Valley Regional Water Quality Control Board staff (Staff) has reviewed the 17 May 2025 RE: Soil Sampling, Underground Storage Tank Closure – Dameron Hospital (Tank Closure Report) documenting the removal of one 6,000-gallon double- walled underground storage tank (UST) and closure of associated product piping at 525 Acacia Street in Stockton (Site). The Tank Closure Report was submitted by Fourt Consulting Group (Fourt) on behalf of the owner of the tank: Dameron Hospital (prepared for Martin Thorpe, Jim Thorpe Oil Company, Inc. [Jim Thorpe Oil]). On 16 April 2025, Fourt oversaw Jim Thorpe Oil remove the 6,000-gallon double-walled UST containing red diesel. The UST contained untaxed red diesel for use by the hospital emergency backup generators. Jim Thorpe Oil abandoned the product piping in-place by backfilling the piping with cement slurry and caping the cut piping with steel plugs. Confirmation soil samples were collected from the former UST pit (UST-1, -2, -5, -6), the soil stockpile (UST-3, -4), and along the product pipeline (P-1, -2, -3). Pipeline samples were collected about every 15 feet from the UST invert. The UST piping runs under the driveway for the ambulance bay and runs parallel to multiple utilities serving the hospital. Fourt collected pipeline soil samples at 20 inches below ground surface (bgs), 36 inches bgs, and 42 inches bgs due to lithology refusal or suspected utility impact. In the Tank Closure Report, Fourt presents the 1988 UST construction plans that indicate the UST pipeline was installed at the base of 18 inches of compacted fill; sitting on top of a native gray plastic clay. Confirmation soil samples contained a de minimis amount of petroleum. Staff compared available case data to the State Water Resources Control Board’s Low- Threat Underground Storage Tank Case Closure Policy. Staff determined that additional environmental investigation is not warranted at this time because the data indicate a low risk to human health and groundwater. Thank you for providing Staff with Site data related to UST removal work and for the opportunity to comment.