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aecom.com Our Reference 60632236 1//10 Mr. Alan M. Buehler, PG Engineering Geologist Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95670-6114 AECOM 2020 L Street Sacramento, CA 95811 aecom.com January 27, 2022 Our Reference 60632236 Subject: Soil and Soil Vapor Sampling Work Plan for the Newark Facility, 800 West Church Street, Stockton, California. Dopaco Area Case #3. GeoTracker Global Identification #T10000006482 Dear Mr. Buehler, On behalf of Newark Group, Inc. (Newark), AECOM Technical Services, Inc. (AECOM) submits this Work Plan for the collection of soil and soil vapor samples from the Newark facility, at 800 West Church Street, Stockton, California (Site) (Figure 1). This document has been prepared to meet the requirements of the Central Valley Regional Water Quality Control Board (RWQCB) letter dated December 7, 2021 (Appendix A) and subsequent communication (Buehler, personal communication, 2021). Proposed work will include the completion of four soil borings to 10 feet below ground surface (bgs) to collect soil and soil vapor samples in the vicinity of the former underground storage tank (UST) footprint (Figure 2). Collected data will be used to evaluate the risk of vapor intrusion to indoor air, and the risk of direct contact and outdoor air exposure based on California State Water Resources Control Board’s Low- Threat Underground Storage Tank Closure Policy (LTCP) (California State Water Resources Control Board 2012). Background The Site’s plant building was constructed in 1918. Since then, several different companies have owned and/or operated at the Site (Geosyntec 2015a), The Site is currently owned by Axis Group, Inc. From December 1981 through June 1988, Dopaco, Inc. (Dopaco) leased a portion of the corner of the building and adjacent outside areas from the property owner at that time, Gold Bond Building Products (Gold Bond). Dopaco’s operations consisted of printing using two rotogravure presses and related activities. Dopaco’s printing activities included the use of various process chemicals including toluene, acetone, alcohols, and acetates. Six product USTs located side-by-side along the exterior perimeter of the building were used to store process chemicals (including toluene in a 4,000-gallon UST). These USTs were installed in 1955 (Geosyntec 2015a). In addition, two waste USTs were located approximately 300 feet southwest of the six product USTs. The waste USTs were also installed in 1955 and were relocated in 1968 (Geosyntec 2015a). Dopaco used four of the six product USTs and the two waste USTs from December 1981 until March 1986, when the USTs were prepared for removal. The remaining two product USTs, storing isopropyl alcohol and a mixture of toluene and several other chemicals, were used by another Site tenant (Geosyntec 2015a).