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04ARCADIS ��t ::.,, <br />for natural and <br />bunt assets <br />Mr. Brian Hitz <br />Central Valley Regional Water Quality Control Board <br />1685 E Street <br />Fresno, California 93706 <br />Subject: <br />Work Plan Amendment <br />Chevron Former Tracy Pump Station <br />14821 West Grant Line Road <br />Tracy, CA <br />GeoTracker Case No.: SL0607707301 <br />Dear Mr. Hitz: <br />On behalf of Chevron Environmental Management Company (CEMC), Arcadis <br />U.S., Inc. (Arcadis) has prepared this Work Plan Amendment for the Central <br />Valley Regional Water Quality Control Board (Central Valley Water Board) for the <br />above-mentioned site (Figure 1). In a letter dated March 22, 2021, the Central <br />Valley Water Board requested CEMC to submit a proposed schedule to <br />implement the SAIC Energy, Environment & Infrastructure, LLC (SAIC) Soil <br />Investigation Work Plan (Work Plan) dated May 10, 2013 and submit a soil <br />investigation report. The objective of the Work Plan was to investigate a <br />previously observed petroleum hydrocarbon seep at the site. The Central Valley <br />Water Board requested that CEMC proceed with the implementation of the Work <br />Plan in their letter dated May 21, 2013. <br />On behalf of CEMC, Arcadis submitted a response letter on April 23, 2021 with <br />proposed schedules to implement the Work Plan, which was contingent upon <br />securing permission from the property owner to conduct a site visit and <br />implement the Work Plan. Due to an inability to connect with the property owner, <br />Arcadis notified the Central Valley Water Board of the property access delays in <br />letters dated July 1 and July 29, 2021, and requested modifications to the <br />proposed Work Plan implementation and reporting schedule. The Central Valley <br />Water Board approved the most recent extension request in their letter dated <br />August 5, 2021 (Attachment A). <br />On July 6, 2021, CEMC and Arcadis met onsite with the property owner to <br />assess the current site conditions and select proposed soil boring locations to <br />investigate the petroleum hydrocarbon seep northwest of the former pump house <br />building. The Work Plan and proposed amendments are discussed below. <br />Arcadis U.S., Inc. <br />735 Tank Farm Road <br />Suite 150 <br />San Luis Obispo <br />Califomia 93401 <br />Tel 805 706 2805 <br />Fax 805 782 9273 <br />www.arcadis.com <br />ENVIRONMENT <br />Date: <br />August 24, 2021 <br />Contact: <br />Christine Perez <br />Phone: <br />805.459.2391 <br />Email: <br />Christine. Perez(cbarcadis.com <br />Our ref: <br />30097697 <br />Page: <br />Former Tracy Pump Station Work Plan Amendment_ 08242021 1/3 <br />