WORK PLANS - Laserfiche WebLink

Home Browse Search

I Geosyntec e consultants In January 1986, Dopaco agreed to work with Gold Bond to clean and.remove the eight USTs from the Site. Dopaco agreed to empty and clean the tanks it was using and Gold Bond would have the tanks removed. In March 1.986, Dopaco notified Gold Bond that the tanks were empty and clean. Gold Bond contracted with American Environmental Management Corp. (AEMC) to remove the eight USTs during the week of 29 September 1986. The closure operations were permitted by the San Joaquin County Public Health Services, Environmental Health Division (the "County") and observed by staff from the County and the RWQCB. Observations by both the contractor and the regulators at the time of the tank removals noted four of the eight tanks were in excellent condition and four tanks were rusted but without visible holes (AEMC,.1986; San Joaquin County, 1986a and 1986b). The four tanks observed to.be-in excellent condition included the toluene/Toluol tank (Tank Q. Tanks B, D, and E were also noted to be in excellent condition. The four tanks with observed rust were the two waste tanks (Tanks G and H), the blanket wash tank (Tank F), and the isopropyl acetate tank (Tank A). No staining was observed in the product tank pit but a slight odor was detected (AEMC, 1986). Some staining and 'E odor was observed in the waste tank pit. . Post-removal sampling of soil from the tank pits showed only low levels of five chemicals including toluene (at <0.1 mg/kg) (AEMC, 1986). Concentrations of the chemicals detected in tank pit soil samples were below regulatory guidance levels for UST corrective action indicating that soil removal was not.necessary. The RWQCB and County agreed in January 1987 that the tank pits could be backfilled (RWQCB, 1987). In early 1988, the California Department of Health Services (DHS) concluded the tank closure was complete and deferred to the County to issue a certificate of closure to Gold Bond (DHS, 1988). Dopaco vacated the property in 1988. In 1997 (11 years after the USTs were removed), the owner of the property, The Newark Group, requested a closure .letter from the RWQCB for the eight USTs that were removed in 1986. The RWQCB responded in early 1998 stating that in order to complete their review of the closure request, additional soil and groundwater samples were required from the.area of the former USTs(RWQCB, 1998). No further activity with respect to closure of the former USTs occurred until 2005. In 2005, a soil and groundwater investigation was performed by Advanced GeoEnvironmental, Inc. (AGE) on behalf of a prospective buyer of the property (AGE, Final Work Plan.doc 3 27 June 2012