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I <br /> .�0 QAVIN rnvexxox <br /> � e QARCIA <br /> ,RE `°RWater Boards NVIIONUENTAL <br /> PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 9 September 2022 <br /> Joshua Hernandez-Zavala <br /> San Joaquin County General Services— Capital Projects <br /> 44 N. San Joaquin Street#590 <br /> Stockton, CA 95202 <br /> EVALUATION OF SITE CONDITIONS, PUBLIC WORKS, 1810 EAST. HAZELTON <br /> AVENUE, STOCKTON, SAN JOAQUIN COUNTY, LUST CASE #390489, <br /> GLOBAL ID #T0607700379 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Quarterly Groundwater Monitoring and Remediation Status Report April 1, <br /> 2022 Through June 30, 2022 (Report) dated 17 August 2022. Condor Earth <br /> Technologies (Condor) submitted the Report on your behalf for the Public Works <br /> underground storage tank (UST) case located at 1810 East Hazelton Avenue in <br /> Stockton. In the Report, Condor presents the results of May 2022 groundwater <br /> sampling at the Site. <br /> In a 31 May 2022 directive letter, Central Valley Water Board staff requested that you <br /> cease ineffective remediation and submit a remedial action plan that presents a <br /> new/revised remedial approach by 26 August 2022. In the Report, Condor states that <br /> the ozone system was shut down 25 May 2022. Condor recommends discontinuing <br /> ozone injection and evaluating if active remediation is warranted. <br /> Central Valley Water Board staff has evaluated current Site conditions against State <br /> Water Resources Control Board's Low-Threat UST Case Closure Policy (LTCP) and <br /> identified remaining impediments to case closure. Staff has the following comments: <br /> 1. Site conditions meet all eight of the LTCP General criteria. USTs 4, 6, 7, and 8 (as <br /> depicted in Tait Environmental Management Inc.'s 11 May 1999 Site Assessment <br /> Report) contained waste oil or unknown contents. Analysis of soil from beneath <br /> these tanks did not include all of the analytes recommended in the State Water <br /> Resources Control Board's September 2012 Leaking Underground Fuel Tank <br /> Guidance Manual (LOFT Manuao. However, soil samples collected beneath these <br /> four USTs did not contain petroleum hydrocarbons above laboratory reporting <br /> limits. Additionally, initial samples collected from wells MW-1 and MW-2 were <br /> analyzed for full-scan volatile organic compounds, and did not contain chlorinated <br /> MARK BRADFORD, CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95070 I www.waterboards.ca.gov/centralvalley <br /> I <br />