ARCHIVED REPORTS_XR0008884 - Laserfiche WebLink

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1 1.0 Introduction IT Corporation (IT) was retained by Lipton (formerly Van den Bergh Foods Company) to generate a Site Closure Report for their facility located at 1400 Waterloo Road in Stockton, California (Figure 1) The only contaminant of concern at the site was total petroleum hydrocarbons (TPH) as diesel This report summarizes all the corrective actions conducted the site, and recommends the site for closure with no further action 2.0 Site Descriptio The facility has been used for commercial food processing for over 30 years, and is located on the flat terrain of California's Central Valley The area surrounding the facility is ' occupied by commercial and residential properties The soils underlying the facility consist largely of silts and clays with interbeds of sands, varying in thickness from 5 feet to over 20 feet The site lies at approximately 20 feet above mean sea level. 3.0 Site History and Summary of Corrective Actions On May 26, 1986, a 1000-gallon gasoline tank, a 550-gallon Stoddard S (petroleum) solvent �. tank, and a 550-gallon diesel tank were removed from a common excavation (Figure 2) Analytical results of native soil samples collected from the bottom of the tank pit yielded a maximum of 26,000 mg/Kg TPH as diesel and chlorinated organic compounds (up to 100 m9/K9 1,4-dichlorobenzene) The tank excavation was subsequently backfilled In 1987, subsurface investigations were conducted to determine the nature and extent (if any) of impacted soil and groundwater Analytical results of a soil boring drilled by Stauffer to a depth of 30 feet below the ground surface (bgs) through the former excavation yielded TPH as diesel concentrations ranging from 14,000 mg/Kg to 61,000 mg/Kg, with associated aromatic hydrocarbons, benzene, toluene, ethyl benzene and total xylenes (BTEX) present. In October 1988, results of an investigation conducted by Weston indicated that TPH as diesel concentrations were below the detection limit for soil (12 5 mg/Kg) and groundwater (1,000 pg/Kg) samples collected during installation and sampling of three monitoring wells These ' wells, MW-1, MW-2, and MW-3, are located approximately 100 feet northwest, 75 feet east, and 100 feet south, respectively, of the former tank locations (Figure 2) The monitoring wells were installed to a depth of approximately 65 feet bgs Figures 3 to 6 present • subsurface geology, vadose zone conditions cross sections, and a location map MZID&13-97/VDBB/97-0009 BK 1