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<br />aecom.com <br />Our Reference 60632236 <br />8/10 <br />vapor sampling will occur a minimum of 48 hours after installation of the soil vapor wells (to allow for <br />equilibration) and is expected to take 1 full day. <br />Removal of soil vapor well construction material, soil sampling between 5 and 10 feet bgs, and backfilling <br />the borings are expected to occur a minimum of 1 day after soil vapor sampling and are expected to take <br />1 full day. <br />Associated IDW removal is expected to occur a minimum of 2 weeks after the completion of sampling <br />activities and is expected to take 1 day. <br />AECOM will include a summary of completed soil and soil vapor sampling activities and a discussion of <br />the associated laboratory results in the first quarter 2022 (1Q22) groundwater monitoring report (Report). <br />AECOM will incorporate any RWQCB review comments prior to the Final Report submission within 15 <br />days of receiving RWQCB comments. <br />Limitations <br />Some background information and other data that AECOM has used in preparing this work plan were <br />furnished to AECOM by third parties. AECOM has relied on this information as furnished and is neither <br />responsible for nor has confirmed the accuracy of this information. <br />If you have any questions, please contact Scott Little at (916) 207-3053. <br />Yours sincerely, <br />Scott Little <br />Project Manager <br />AECOM <br />T:916-414-5874 <br />M:916-207-3053 <br />E:scott.a.little@aecom.com <br />Richard A. Burzinski, PG, CHG <br />Senior Hydrogeologist <br />AECOM <br />T:916-414-5800 <br />M:530-368-9667 <br />E:Richard.Burzinski@aecom.com <br />enclosures: Figure 1 Site Location Map <br />Figure 2 Proposed Boring Locations <br />Appendix A Central Valley Regional Water Quality Control Board Letter dated December 7, 2021 <br />Appendix B Field Sampling Procedure Using Summa Canisters with Quick-Connect (QT) Fittings <br />Appendix C Using Disposal Syringes for TO-17 Sample Collection