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Second Semi-Annual Groundwater Monitoring Report - Third Quarter 2017 <br />Former Chevron Service Station No. 94054 <br />December 12, 2017 <br />2.0 SITE INFORMATION <br />Current phase of project: Groundwater Monitoring and Sampling <br />Frequency of monitoring and sampling: <br />Semi-Annually: MW-1A, MW-1B, MW-1C, MW-2, <br />MW-2B, MW-2C, MW-3, MW-4, MW-4B, MW-4C, <br />MW-4D, MW-5 through MW-9, MW-9B, MW-9C, <br />MW-9D, MW-10 through MW-12, MW-12B, <br />MW-12C, MW-13B, and MW-14B <br />Have separate-phase hydrocarbons (S PH) <br />historically been found on-site? Yes (MW-3 in 1988) <br />Historic range in depth-to-water (DTW) <br />[feet(ft) below top of casing (TOC), <br />4Q92 - 3017]: <br />3.33 (MW-10) to 23.41 (MW-4) <br />Water supply wells within a 1/2-mile radius: None <br />Current remediation technique: Natural Attenuation <br />3.0 GROUNDWATER MONITORING AND SAMPLING <br /> <br />3.1 WORK PERFORMED <br />The First Semi-Annual Groundwater Monitoring Report - First Quarter 2017 was submitted to San <br />Joaquin County Environmental Health Department dated July 28, 2017. <br />Gettler-Ryan Inc. of Dublin, California (Gettler-Ryan) performed the Second Semi-Annual <br />groundwater monitoring and sampling event on September 25 and 26, 2017. <br /> <br />3.2 MONITORING AND SAMPLING PROCEDURES <br />Gettler-Ryan's standard operating procedures for groundwater sampling are detailed in <br />Appendix B. <br /> <br />3.3 WASTE DISPOSAL <br />The purge water and decontamination water generated during sampling activities was <br />transported by Clean Harbors Environmental Services to Seaport Environmental located in <br />Redwood City, California for proper disposal. <br />Stantec <br />2