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m Geosyntec consultants 3) Dopaco should prepare and submit by 30 June 2012 an investigation work plan that includes the installation of at least four groundwater monitoring wells. To meet the RWQCB's second finding, Geosyntec's 10 April 2012 letter report was uploaded to GeoTracker on 20 June 2012. This Work'.Plan was prepared to meet the third finding of the RWQCB's 29 May 2012 letter. 1.2 Site UST History The 800 West Church Street property is shown on Figure 1. The plant building was constructed in 1918, and several different companies have owned and/or operated at the property. Since 1989, the property has been owned by The Newark Group, parent company of Newark Sierra, which operated at the property. The plant building was demolished in 2011. From December 1981 through June 1988, Dopaco leased a portion of the northwest 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 used water-based and solvent-based inks that were later converted to water-based ink. Process chemicals used included toluene, acetone, alcohols, and acetates. Toluene (also called Toluol)was stored outside the building in a 4,000 gallon underground storage tank(UST). As shown on Figure 2, the tank that was used to store toluene is labeled as Tank C and was located in an area where a total of six tanks were used to store various process chemicals (the"product tanks"). The product tanks were installed in 1955 and were located next to one another, along the northwest exterior perimeter of the building (Tanks A through F, from north to south). In addition, two liquid waste storage tanks (Tanks G and H) were also located in this area, about 300 feet(ft) southwest of the six product tanks (Figure 2). The waste tanks were also installed in 1955 and were relocated from a previous, unknown location in 1968. Dopaco used four of the six product tanks and the two waste tanks from December 1981. until March 1986, when the tanks were prepared for removal. The remaining two product tanks were used by another Site tenant that stored isopropyl alcohol (Tank B) and blanket wash (Tank F), which was a mixture of toluene and several other chemicals. Final Work Plan.doc 2 27 June 2012