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AECOM <br /> AECOM <br /> 2020 L Street <br /> Sacramento,CA 95811 <br /> aecom.com <br /> July 21, 2021 <br /> Our Reference <br /> 60632236 <br /> Mr.Alan M. Buehler, PG <br /> Engineering Geologist <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br /> Subject: Well Destruction Work Plan for Newark Group, Inc. Case#2, 800 West Church Street, Stockton, <br /> California, GeoTracker Global Identification #T10000004123 <br /> Dear Mr. Buehler, <br /> On behalf of Newark Group, Inc. (Newark),AECOM Technical Services, Inc. (AECOM) submits this Work <br /> Plan for the destruction of groundwater monitoring wells at the Newark facility at 800 West Church Street, <br /> Stockton, California (Site) (Figure 1). This document has been prepared to meet the requirements of the <br /> Central Valley Regional Water Quality Control Board (RWQCB) letter dated June 17, 2021 requesting a <br /> Work Plan for the destruction of 11 wells associated with RWQCB Newark Case#2. <br /> Background <br /> In August 1985, two 4,000-gallon, diesel underground storage tanks (USTs)were removed from the <br /> southwestern corner of the Site. Subsequent investigation activities performed in 2005 identified elevated <br /> concentrations of total petroleum hydrocarbons as gasoline (TPH-g) and total petroleum hydrocarbons as <br /> diesel (TPH-d) in groundwater(AECOM 2020a). <br /> In January 2001, San Joaquin County Environmental Health Department (SJCEHD) provided Site closure <br /> for three storage tanks in the southeastern corner of the Site.The three storage tanks included one <br /> 210,000-gallon#6 fuel oil aboveground storage tank and two 5,000-gallon #6 fuel oil USTs. Investigations <br /> conducted in this area in 2005 reported elevated concentrations of TPH-d in soil and groundwater <br /> (AECOM 2020a). <br /> Groundwater monitoring at nine shallow and two deep wells began in 2014. Various soil, soil vapor, and <br /> groundwater investigations have been performed by different consultants to determine the horizontal and <br /> vertical extent of contamination (AECOM 2020a). <br /> In December 2020,AECOM submitted a Site Closure Evaluation report to RWQCB (AECOM 2020a). In a <br /> letter dated February 5, 2021, RWQCB concurred that Site conditions met all the General and Media- <br /> Specific criteria established in the State Water Resources Control Board's Low-Threat Underground <br /> Storage Tank Case Closure Policy (LTCP). Following a 60-day public comment period, during which no <br /> comments were received, RWQCB requested this well destruction work plan (RWQCB 2021). <br /> aecom.com <br /> Our Reference 60632236 <br /> 1/6 <br />