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Subject Field Sampling Plan Addendum for FMS #24 UST Site <br />Hi Devra, <br />I have the following comments on the FSP Addendum: <br />Sensitive Receptor Survey: Include San Joaquin County Environmental Health in <br />the proposed review of well records. <br />Soil Gas Sampling: Follow the 2003 DTSC/Los Angeles RWQCB "Advisory - Active <br />Soil Gas Investigation" and DTSC's "Guidance for the Evaluation and Mitigation <br />of Subsurface Vapor Intrusion to Indoor Air" (2004). We are concerned about <br />short-circuiting to surface, so please collect the samples at 6 to 8 feet bgs <br />rather than 5 feet bgs. The borehole needs to be properly sealed per the <br />guidance to avoid short-circuiting. Purging, sample collection, leak testing, <br />analysis ...etc. also needs to follow DISC guidance. <br />Thanks. <br />Marcus L. Pierce <br />Engineering Geologist <br />CVRWQCB <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670-6114 <br />916-464-4733 (phone) <br />916-464-4797 (fax) <br />