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FREYENVIRONMENTAL, INC. <br /> Environmental Geologists,Engineers,Assessors <br /> 2817 A Lafayette Avenue <br /> Newport Beach, CA 92663 <br /> (949) 723-1645 <br /> Fax:(949) 723-1854 <br /> Email:freyinc@freyinc.com <br /> June 30, 2022 <br /> 1092-01 <br /> Vera Fischer <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, CA 95670 <br /> REMEDIATION FEASIBILITY STUDY & PILOT TESTING WORK PLAN <br /> TO ADDRESS POTENTIAL VAPOR INTRUSION RISK <br /> CANCUN RESTAURANT <br /> 135 EAST MINER AVENUE <br /> STOCKTON, CALIFORNIA <br /> (GLOBAL ID #T0607715874) <br /> Dear Ms. Fischer: <br /> This remediation feasibility study and pilot testing work plan to address potential vapor intrusion <br /> risk to indoor air at the subject location (Site) (Figures 1 through 3) has been prepared by FREY <br /> Environmental, Inc. (FREY) for your review. This document was prepared in response to a <br /> directive from the Regional Water Quality Control Board — Central Valley Region (RWQCB) <br /> dated March 8, 2022 (Appendix A). <br /> SITE SETTING AND BACKGROUND <br /> The Site setting and background, including historical Site assessment and remediation activities, <br /> are presented in the following previously-submitted documents for the Site which are available <br /> on the State Water Resources Control Board(SWRCB) Geotracker website: <br /> • Preliminary Site Assessment Work Plan, by Advanced GeoEnvironmental (AGE), dated <br /> April 7, 2008. <br /> • Soil-Vapor Investigation Work Plan—October 2016, by AGE, dated October 28. 2016. <br /> • Revised Sensitive Receptor Survey, by AGE, dated May 15, 2017. <br /> • Soil Vapor and Indoor Air Monitoring Report—First Quarter 2019, by AGE, dated May <br /> 14, 2019. <br /> • Second Quarter 2021 Groundwater Monitoring and Sampling Report and Corrective <br /> Action Status Update, by FREY, dated August 10, 2021. <br />