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RESOURCES <br />September 8, 2017 <br />Mr. Marcus Pierce <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670 <br />(916) 464-4733 <br />Subject: Revised Soil Gas Sampling Letter Workplan <br />Field Maintenance Shop #24 <br />8020 South Airport Way <br />Stockton, CA <br />Global ID 10607700742 <br />Star Resources Corp. Job No. 17042 <br />Dear Mr. Pierce: <br />This Revised Soil Gas Sampling Letter Workplan was prepared by Star Resources Corp. (Star) <br />under contract with the State of California Military Department (Contract Number F0713) on behalf <br />of the California Army National Guard (CA ARNG). The CA ARNG proposes to install and sample <br />three temporary soil gas probes to evaluate potential soil gas concentrations at three buildings <br />around former fuel underground storage tanks (USTs). A fourth probe is proposed to determine <br />worst-case, vapor-intrusion risk at a location overlying the former USTs. This limited investigation is <br />not meant to be a detailed vapor intrusion assessment, but is being proposed to assist with a <br />potential no-further-action determination for this site under the State Water Resources Control <br />Board's Low-Threat UST Case Closure Policy. This letter workplan details the proposed field work <br />for approval by the Central Valley Regional Water Quality Control Board (CVRWQCB). It was <br />revised from the original submittal, primarily to relocate one of the proposed sample locations, at the <br />request of the CVRWQCB. <br />SITE INFORMATION <br />The following sections provide background related to the site, UST releases, and historical <br />assessment activities, primarily obtained from Semiannual 2012 Groundwater Monitoring and <br />Remediation Progress Report, California Army National Guard. Field Maintenance Shop #24. <br />Stockton, California (OTIE, 2012b). All report references are provided in Attachment 1. <br />SITE LOCATION <br />The site is located at 8020 South Airport Way. Stockton, San Joaquin County. California (Figure 1), <br />All figures are provided in Attachment 2. The site is one of four divisional areas at the CA ARNG <br />1026 Blinn Ave., Wilmington, CA 90744 <br />Phone: 310.952.1148 • Fax 310.952.1182