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ERM 1340 Treat Boulevard Telephone: +1 925 946 0455 Suite 550 Email: shannon.martin@erm.com walnut Creek, California 94597 www.errn.com 26 May 2023 Michael Quillici, CPESC, PMP, QSD Pacific Gas and Electric Company ERM 850 Stillwater Road West Sacramento, CA 95605 Reference: 0692042 Subject: Historic Petroleum Release Groundwater Investigation Workplan PG&E Turner Cut Station 2121 N Zukerman Road Stockton, California Dear Michael: On behalf of Pacific Gas and Electric Company (PG&E), Environmental Resources Management, Inc. (ERM) has prepared this Historic Petroleum Release Groundwater Investigation Workplan (Workplan)to investigate potential groundwater contamination at the Turner Cut Station located at 2121 N Zukerman Road in Stockton,California (Site; Figure 1). This Workplan was prepared in response to the Central Valley Regional Water Quality Control Board's (RWQCB) Request for Additional Investigation: Turner Cut Station, 2121 N Zukerman Road, Stockton, San Joaquin County, California, dated 28 March 2023 (Letter Request). The scope of work includes a focused groundwater investigation at the Site to identify potential groundwater contamination associated with the historical petroleum release that was discovered by PG&E on 3 February 2023 during abandonment of gas well TC6S (Figure 2). The details of the groundwater investigation are included herein. 1. BACKGROUND On 3 February 2023, during initial excavation for abandonment of gas well TC6S at the Site, PG&E discovered a historical spill of lessthan 40 gallons of hydraulicoil. The petroleum-impacted soil was discovered at approximately 7 feet below ground surface (bgs). PG&E submitted a Hazardous Materials Spill Report to the California Office of Emergency Services (OES; OES Control#23-946)on 3 February 2023 and submitted Notification of Hazardous Waste Discharge to San Joaquin Environmental Health Department(SJEHD; EHD Log#23-018)on 7 February 2023. PG&E contracted Clean Harbors Environmental Services, Inc. (CHES) to perform additional excavation around the wellhead,and hydro-excavation proceeded to a depth of approximately 8 feet bgs. Peat soil at approximately 5 feet bgs prevented PG&E and their contractor from visually being able to determine the extent of contamination. On 13 February,CHES collected confirmation soil samples from the excavation (four side-wall samples and one four-point composite floor sample), one accumulated water sample from within the excavation, and two samples from water accumulated within the excavated spoils. ©Copyright 2023 by The ERM International Group Limited and/orits affiliates("ERM").All Rights Reserved. No part of this work may be reproduced or transmitted in any form, or by any means, without the prior written permission of ERM.