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SaL EXAVATION AND SUBSURFACE INVESTIGATION RESULTS Rif 32 Tokay Street Lodi Caidorrna • Drilling and sampling three sal borings (AB, S13-1, and S13-2) to a depth of approximately 30 feet below surface, to assess native soil conditions beneath and adjacent to the former excavation Characterizing and disposing of the drill cuttings and stockpiled soil at the Forward, Inc (Forward), a Class II landfill facility in Stockton, California 2.0 BACKGROUND 2.1 Site Description The site is located at the Pacific Coast Producers Lodi Cannery Plant on the north side of Warehouse #6, in a commercial area of Lodi, California A 10,000 -gallon diesel tank was reportedly removed from the site in 1987 The approximately 10 -foot -wide by 35 -foot -long by 15- to 20 -foot -deep excavation was backfilled with a blend of previously -excavated soil and clean fill However, soil containing diesel fuel was noted in the excavation pit, prompting a request for investigation and remediation activities from the County The County requested removal of all sod containing greater than 100 parts -per -million (ppm) total petroleum hydrocarbons (TPH), as diesel and oil & grease, 10 ppm TPH, as gasoline, and 0 005 ppm for benzene, toluene, ethyibenzene, and total xylenes (BTEX) 2 2 Previous Invests atlon In 1991, five soil borings were drilled and sampled to depths of 20 feet below grade in the area of the former excavation The borings were drilled to assess the vertical and lateral extent of soil containing petroleum hydrocarbons Four of the borings were drilled 5 feet from the former excavation on each of the four sides The fifth boring was drilled in the center of the former excavation Soil samples from depths ranging from 4 to 20 feet contained concentrations of TPH, as diesel, and oil & grease, ranging from below detection limits (BDL) to 603 ppm Concentrations of BTEX ranged from BDL to 0 0483 ppm No hydrocarbons were detected in soil samples from the borings north and south of the excavation 2.3 Generalized Geology and Hydro -geology The site is located in the San Joaquin Valley portion of California's Central Valley The general geology of the area is indicated on the Geologic Map of California (1977) as Quaternary -age alluvium 92-074A ERR