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EDMDND G. BROWN JR. }s�a GOYERNOfl C n L i r O re H e e MA7rHEmw RQDRIOUEZ WaterBoards ENYIflONMEHTAL PROTECTION Central Valley Regional Water Quality Control Board 13 April 2017 Chevron Environmental Management Company CERTIFIED MAIL c/o James Kiernan 7011 2970 0003 8939 4218 6001 Bollinger Canyon Road, Room C2102 San Ramon, CA 94583 WATER CODE SECTION 13267 ORDER NO. R5-2017-0813 FOR SUBMITTAL OF TECHNICAL AND MONITORING REPORTS, FORMER UNOCAL STATION#6981, 4707 PACIFIC AVENUE, STOCKTON, SAN JOAQUIN COUNTY, CASE# 390204 You are legally required to respond to this Order. Please read it carefully. As described in the findings below, an unauthorized release of petroleum constituents was discovered in 1988 at Former Unocal Station #6981, located at 4707 Pacific Avenue in Stockton, California (Site) and identified by San Joaquin County assessor parcel number 108-160-04. The unauthorized release originated from an underground storage tank (UST) system. In 2013, following extensive investigation and remedial efforts, the Central Valley Water Board conditionally concluded that the Site met the requirements of State Water Board Resolution No. 2012-0016, the State Water Board Low-Threat Underground Storage Tank Case Closure Policy (Low-Threat Closure Policy), provided that the public was given an opportunity to comment on the closure plan and that the monitoring and remediation wells at the Site were properly destroyed pursuant to local ordinances and in compliance with county permitting requirements. Despite multiple requests from the Central Valley Water Board to Chevron Environmental Management Company (hereafter referred to as the Responsible Party), the wells were never destroyed. Therefore, the case remains open. The Central Valley Water Board is issuing the attached Technical Reporting Order R5-2017-0813 (Order) pursuant to Water Code section 13267 to ensure that the two abandoned or permanently inactive groundwater monitoring wells and the eleven abandoned or permanently inactive remediation wells at the Site are not acting as conduits posing a continuing threat to water quality. The Order will require periodic sampling of these wells, and will authorize the Central Valley Water Board to impose civil liability if the wells are not monitored in accordance with the schedule specified herein. As an alternative to complying with the monitoring requirements imposed by this Order, the Responsible Party may elect to properly destroy the abandoned or permanently inactive wells within 60 days of the issuance of this Order, thereby ameliorating any future risk to water quality posed by these wells. KARL E. LONGLEY SCD, P.E.,CHAIR I PAMELA C. CREEOON P.E.,BCEE, EXECUTIVE OFFICER 11020 Sun Center Drive#200,Rano ho Cordova,CA 95670 1 www.waterWards.ca.govlcentraivalIey %,V RECYCLED PAPER