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2,40K EDMUNDOVG. BRowN JR. C A L I F O N N I A MATTHEw RODRIQUEZ SEC R[T/,RV cDF Vater Boards ENVIRONMENTAL PROTECTION Central Valley Regional Water Quality Control Board 26 June 2018 Atul Kumar & Suman Batra 91 Los Altos Drive Hollister, CA 95023 FORMER HESS-DUBOIS CLEANERS, 348 W. HARDING WAY, STOCKTON, SAN JOAQUIN COUNTY, CASE# 390621 In 2 June 2015 and 1 February 2018 letters, Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff requested that you submit a Work Plan for the underground storage tank (UST) and chlorinated solvent releases located at 348 W. Harding Way, Stockton, San Joaquin County (Site). However, Central Valley Water Board staff requests that you postpone conducting the scope of work requested in those letters and conduct the scope of work requested herein. Two Central Valley Water Board cases exist for the Site: underground storage tank (UST) case #390621 associated with the Stoddard solvent release provides oversight of the petroleum hydrocarbon release; and case #SL.T5S155 provides oversight of the chlorinated solvent (trichloroethene and tetrachloroethene) release. The scope of work we now request addresses the UST case and costs associated with the requested work are reimbursable through the State Water Resource Control Board's (SWRCB's) UST Cleanup Fund program. Previously requested work included scopes of work for the Stoddard solvent release and the chlorinated solvent release and work associated with the chlorinated solvent release are not eligible for Cleanup Fund reimbursement. Central Valley Water Board staff reviews and compares Site data using the SWRCB's Low- Threat Underground Storage Tank Case Closure Policy(LTCP) to evaluate UST cases for regulatory closure. Based on a review of Site data, the extent of petroleum hydrocarbon impact to soil the Site remains undefined. While heating oil was reported in soil beneath the former heating oil tank, groundwater beneath the Site has not been analyzed for heating oil. As such, during the next groundwater sampling event in 3rd quarter 2018, please additionally analyze collected samples-for heating oil, and submit a Groundwater Monitoring Report (GMR) by 30 October 2018. To adequately assess shallow soil for comparison to the LTCP Petroleum Vapor Intrusion and Direct Contact and Outdoor Air Exposure criteria, by 26 October 2018, please submit a Work Plan for assessment of shallow soil across the Site. Soil samples should be collected between 0 to 5 feet below the ground surface (bgs) and 5 to 10 feet bgs and analyzed for total petroleum hydrocarbons as Stoddard solvent (TPHss), heating oil, benzene, toluene, ethylbenzene, xylenes (collectively BTEX), methyl tertiary butyl ether (MTBE), and naphthalene. At least one of the soil sampling locations should be near the former 350-gallon UST and include analysis for polycyclic aromatic hydrocarbons (PAHs). KARL E. LONGLEY SCD, P.E.,CHAIR I PATRICK PULUPA, ESO., EXECUTIVE OFFICER 11020 Sun Center Drive#200.Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley ICI RECYCLED PAPER