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Work Plan for Shallow Soil Assessment and Proposed Well Sampling Schedule Modification Stockton Charter Way Commingled Plume #CP0057 February 17, 2023 • Former Texaco (Equilon), located at 440 West Charter Way in Stockton, and, • Former Colombo/Toscana Bakery (Sara Lee; now BBU), located at 1444 South Lincoln Street in Stockton. In April 2010, the CRWQCB-CVR classified the Site as a commingled plume and since then the JC have been working cooperatively to address the environmental cases. In 2003, the City of Stockton changed the name of a portion of West Charter Way to Dr. Martin Luther King Jr. Boulevard. For reporting purposes, the Site has continued to be referred to as the Stockton Charter Way Commingled Plume Site and the historical Charter Way addresses are used. 1.2 SITE AND SURROUNDING AREA The Site is currently comprised of an active car wash facility (former ARCO Service Station No. 2168 - located on the northeast corner of the intersection of West Charter Way [a.k.a. Dr. Martin Luther King Jr. Boulevard] and Lincoln Street), an active Chevron -branded gasoline service station (Chevron Facility #92033 - located on the southwest corner of the intersection of West Charter Way and Lincoln Street), an ARCO -branded gasoline service station (former Texaco [Equilon] - located on the southeast corner of the intersection of West Charter Way and Lincoln Street), and a storage warehouse (former Colombo/Toscana Bakery [BBU] - located south of the former Texaco [Equilon] on the east side of Lincoln Street). The Site is comprised of parcels 16503003, 14707607, 16504016, and 16503005. The area surrounding the Site includes mixed residential and commercial use. Former ARCO Service Station No. 2168 currently consists of an active car wash facility; no underground storage tanks (USTs) or fuel dispensers are present on the property. Chevron Facility #92033 currently consists of a station building, four fuel dispensers on two islands, and three USTs. BBU currently consists of a warehouse building; no USTs or fuel dispensers are present on the property. The former Equilon facility, currently an ARCO -branded facility consists of a station building, a car wash, four fuel dispenser islands, and four USTs. The Site lies at an elevation of approximately 12 feet (ft) above mean sea level on flat terrain. 1.3 CURRENT STATUS In their letter dated December 20, 2022, the CRWQCB-CVR noted the path forward for the four commingled underground storage tank (UST) sites as listed below. 1. To confirm that post -remediation soil conditions at the former ARCO property meet Low - Threat UST Case Closure Policy (LTCP) criteria, additional shallow soil assessment is required. 2. Stantec will continue efforts to install downgradient wells SMW-34D, SMW-34E, and SMW-36E at locations that have been revised due to offsite property access limitations. Wells will be installed per Stantec's February 2016 Work Plan, at revised locations that were approved by the CRWQCB-CVR in July 2022. 3. Several Site wells that have never been impacted or are no longer impacted may be either reduced to annual gauging/inspection only or proposed for destruction. These wells are listed below along with rationale to support each recommendation. Wells that need repair will be addressed herein. ® Stall 4