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Work Plan for Shallow Soil Assessment and Proposed Well Sampling Schedule Modification <br />Stockton Charter Way Commingled Plume #CP0057 <br />February 17, 2023 <br />4.0 PROPOSED WELL SAMPLING SCHEDULE MODIFICATION <br />4.1 PROPOSED MONITORING AND SAMPLING FREQUENCY <br />Based on historical groundwater analytical data summarized in Table 1, several wells have never <br />been impacted by hydrocarbon releases or are no longer impacted and are not useful for their <br />intended purpose. However, certain wells may still be useful as part of case closure evaluations <br />and are recommended to be retained for that future effort. With CRWQCB-CVR approval, the <br />wells shown in the table below would be monitored for groundwater elevations annually and to <br />confirm well integrity. Wells AMW-5, DMW-6, DMW-8, DMW-9, and DMW-15 are recommended <br />for proper destruction. <br />Stockton Charter Way Commingled Plume: Proposed Monitoring and Sampling Frequency: <br />ARCO <br />Chevron <br />Equilon <br />BBIJ <br />Dolly <br />Madison <br />AMW-1 <br />CMW-4A <br />SMW-3 SMW-26B <br />SLMW-10D <br />AMW-1 B <br />CMW-5A <br />SMW-3-79 SMW-27C <br />SLMW-1 1 D <br />AMW-1 C <br />CMW-5C <br />SMW-3-1 19 SMW-27D <br />SLMW-12A <br />AMW-2 <br />CMW-6A <br />SMW-10-81 SMW-28C <br />SLMW-13B <br />Semi- <br />AMW-3 <br />CMW-7A <br />SMW-11-82 SMW-28D <br />SLVE-1 <br />AMW-6 <br />CMW-7B <br />SMW-19-81 SMW-29C <br />SLVE-2 <br />Annually <br />AMW-7 <br />CMW-7C <br />SMW-20- SMW-29D <br />Sample <br />AMW-8B <br />CMW-8C <br />83.5 SMW-31 B <br />(2Q/4Q) <br />AMW-8C <br />SMW-21-80 SMW-32B <br />SMW-22-80 SMW-33B <br />SMW-24A SMW-35D <br />SMW-24B SMW-35E <br />SMW-25B <br />CMW-4C <br />SMW-10-1 17 <br />SLMW-1 A <br />Annually <br />CMW-6C <br />SMW-11-122 <br />SLMW-3A <br />Sample <br />SMW-15 <br />SLMW-8-87 <br />(2Q) <br />SMW-19-120 <br />SLMW-9-120 <br />AMW-8 <br />SMW-25A <br />SLMW-2A <br />AMW-9 <br />SMW-26A <br />SLMW-4A <br />Annually <br />AMW-11 <br />SMW-30A <br />SLMW-10C <br />Monitor <br />SMW-2 <br />(2Q) <br />SMW-8 <br />SMW-14 <br />SMW-23A <br />Destroy <br />AMW-5, DMW-6, DMW-8, DMW-9, DMW-15 <br />Locate/Access* <br />SMW-8, SLMW-4A <br />* Well SMW-8 has been blocked recently restricting access and SLMW-4A could not be located during recent events. <br />These wells will be located and accessed for monitoring and sampling during the 2Q2023 event. <br />® Stantec 8 <br />