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aLDRICH Snell 510871 File No. 130215,004 California Regional Water ttualiry,Control Boats Central Valley Region RanchoCord�Califon a95670 Attention: Marcus Perce, AN, COG Subject: Addendum to Revised soil vapor and Groundwater Investigation Work Plan Former ectle USA Facility Ripon, California Bear Mr Pierce On behalf of Nestle USA, Inc (Nestle), Haley & Aldrich, Inc (Haley &Aldrich) has prepared this addendum to the RMredSofl Vapour and GmumMwter fnvanpatbn Work Plan (Revised n, Haley & Aldrich, 2019a)far the former Nestle facility located at 230Industrial Avenue m Ripon, California (Site; re1). The Revised Work Plan was submitted to the California Regional Water County Control Board— Central valley Became Maier Board) on 14 June 2019, and described additional she to (a) evaluatethe vapor intrusion pathway with additional off-Site soil vapor and Investigation sampling, and Rai de and west of Highway 99 (referred to as the m1mom ,area'for eo'nWi enee). The Revised Work Plan warapproved the Water Board an 20 June 2019. and the proposed Investigation was conducted in July and August 2019. On 3 seir ember 2019, Haley & Aldrich submitted the Interim sport on sod vapor and urourMwater fnvaNdmeuns (Interim Report; Haley & Aldrich, 20191d, which describod the interim results and findings from the first phase a implementation of the Revised Work Plan. A detailed description of the Site history, hydrogedogy, and distribution of chemicals of concern (Co¢) ran He found in the Interim Repon". Previous North Area Groundwater Investigation The Revised Work Plan proposed to advance up to six borings in the Ninth Area to the maximum depth achievable, which was t150 feet below and surface (Had or greater, for the collection of deptlydiscrete groundwaterAs described samples. described in the Interim Report, of the six ed locations, depthAncrete groundwater samples were collected from three borings MPs HP1111, and 0; Figure 2), to rammed deplus of 120 feet lags. After multiple attempts at these locations, it Became apparent that me cone penetrometer test (CPT) drilling equipment could be advanced beyond 120 feet bgs because 4 a hard soil horizon at this depth. In addition, Aldrich was not able m obtain access to one of me properties where two proposed bodras were located.