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HALEY&ALDRICH,INC. <br /> 426 17"Street <br /> 'CH Suite 700 <br /> 'ABNOakland, <br /> CA 94612 <br /> 510.879.4544 <br /> 23 February 2022 <br /> File No. 0130215-007 <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95670 <br /> Attention: Amber Ginorio, GIT <br /> Subject: Response to Water Board Comments on: Results of 2021 Soil Vapor Sampling <br /> and Work Plan for Building Specific Vapor Intrusion Evaluations <br /> Former Nestl6 USA, Inc. Facility <br /> Ripon, California <br /> Dear Ms. Ginorio: <br /> On behalf of Nestl6 USA, Inc. (Nestl6), Haley&Aldrich, Inc. (Haley&Aldrich) has prepared this letter to <br /> respond to comments provided by the Central Valley Regional Water Quality Control Board (Water <br /> Board) regarding the Results of 2021 Soil Vapor Sampling and Work Plan for Building Specific Vapor <br /> Intrusion Evaluations(VI Work Plan)'.The VI Work Plan was submitted on 2 November 2021, and the <br /> Water Board provided comments in a letter dated 23 December 2021. <br /> The Water Board comments are presented below (in italics)followed by Nest16's responses. <br /> Water Board Comment 1: <br /> Issue:the VI Work Plan does not propose to sample any of the existing soil vapor probes. However, the <br /> new soil vapor probes, SV-131 and SV-132, will be sampled two times spaced approximately six months <br /> apart.Additionally, VI Work Plan does not specify if the sampling of SV-131 and SV-132 will be <br /> coordinated with the indoor air samples collected at the nearby building. <br /> Requested Action:Central Valley Water Board staff recommend that the nearby probes SV-107,SV-122, <br /> and SV-123 are sampled concurrently with SV-131 and SV-132 to better evaluate the extent of the <br /> trichloroethene(TCE)soil vapor plume.Additionally, please coordinate the sampling of these probes with <br /> the timing of the nearby building-specific crawlspace and/or indoor air samples to correlate the results. <br /> 1 Haley&Aldrich, 2021. Results of 2021 Soil Vapor Sampling and Work Plan for Building Specific Vapor Intrusion <br /> Evaluations, Former Nestle USA, Inc. Facility, Ripon,California.2 November. <br /> www.haleyaldrich.com <br />