ARCHIVED REPORTS_XR0013090 - Laserfiche WebLink

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1.0 SITE BACKGROUND Spreckels Sugar is located at 20500 Holly Drive in Tracy, California (Site). A sugar beet factory has operated at this location from approximately 1918 through 2000. Sugar packaging and distribution continued through 2008. The Site is an industrial property on the city limits of Tracy adjacent to the city sewer plant to the east and south. This report discusses the presence of two underground storage tanks (USTs), a concrete bunker fuel oil vault (Bunker), and a new discovered UST associated with the Site. Figure 1 shows the location of the Site. The two USTs were removed under permit from San Joaquin County Environment Health Department (END) in 1985. One UST was a 1,000-gallon unleaded tank (UST A) and located approximately 180 feet north of Arbor Avenue and 1,000 feet east of Holly Drive as shown in Figure 2 [interpreted from Harding Lawson Associates (HLA, 1994)]. Approximately 70 cubic yards (yd3) of impacted soil was over excavated at the time of the UST removal (Minney, 2010). Mr. John M. Minney prepared and submitted a low-risk closure assessment for UST A that is included in Mr. Minney's UST Remediation Proposal — Excavation Only Workplan dated October 21, 2010. The second was a 1,000-gallon leaded UST (UST B) located north of the molasses tanks approximately 925 feet north of Arbor Avenue and 1,450 feet east of Holly Drive. The analytical results from the residue wipe in the newly discovered UST indicated the product was in the motor oil/hydraulic oil range and will be referred to in this report as the Motor/Hydraulic Oil UST. The Motor/Hydraulic Oil UST was located 30 feet west of UST B. The following report documents the excavation of impacted soils in the UST B location and the removal of the Motor/Hydraulic Oil UST and the excavation of impacted soils in that location in early 2011. Figure 2 shows the area of UST B and the Motor/Hydraulic Oil UST. The Bunker was located near the west side of the molasses tanks approximately 840 feet north of Arbor Avenue and 1,400 feet east of Holly Drive (Figure 2). The following report documents the excavation of impacted soils in the Bunker location in early 2011. Mr. Minney submitted the UST Remediation Proposal — Excavation Only Workplan dated October 21, 2010. In a letter dated October 27, 2010, EHD approved the workplan with comments and conditions. The following report documents the work conducted at the Site from ' December 2010 through February 2011. 2.0 SITE REMEDIATION ACTIVITIES (2010-2011) Ground Zero supervised the removal of a Motor/Hydraulic Oil UST, the destruction of two monitoring wells, the excavation of the former UST B location, the excavation of the former Bunker Fuel location, and the installation of a groundwater monitoring well. Ground Zero also conducted an assessment of the site to determine if the data warrants a request for low-risk closure. - t -