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HALEY&ALDRICH, INC. <br /> '�� 426 17th Street <br /> Suite 7HkEK00 <br /> Oakland,,CA 94612 <br /> 510.879.4544 <br /> 02 November 2021 <br /> File No. 0130215-007 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 10020 Sun Center Drive#200 <br /> Rancho Cordova, California 945670 <br /> Attention: Amber Ginorio, GIT <br /> Subject: Results of 2021 Soil Vapor Sampling and Work Plan <br /> for Building Specific Vapor Intrusion Evaluations <br /> Former Nestle USA Inc. Facility <br /> Ripon, California <br /> Dear Ms. Ginorio: <br /> On behalf of Nestle USA, Inc. (Nestle), Haley&Aldrich, Inc (Haley&Aldrich) has prepared this Results of <br /> 2021 Soil Vapor Sampling and Work Plan for Building Specific Vapor Intrusion Evaluations (VI Work Plan) <br /> for select properties near the former Nestle facility located at 230 Industrial Avenue in Ripon, California <br /> (Site). The development of this VI Work Plan was based on the findings of recent shallow groundwater <br /> and soil vapor investigations which are presented in the Final Third Interim Report on Soil Vapor and <br /> Groundwater Investigations (Third Interim Report; Haley&Aldrich, 2021) and recommendations of staff <br /> at Central Valley Regional Water Quality Control Board (Water Board). In addition,following the <br /> recommendations provided in the Third Interim Report,this VI Work Plan presents the results of <br /> continued soil vapor monitoring conducted at select locations in 2021.The scope of this VI Work Plan <br /> includes installation of new soil vapor probes and building-specific vapor intrusion evaluations in the <br /> two areas retained for further investigation identified by the Third Interim Report. <br /> www.haleyaldrich.com <br />