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September 14, 1998 Page 3 On September 22, 1995 PEG dulled five soil borings, labeled B-1 through B-5 in Figure 3 The borings were drilled to investigate soil conditions in the vicinity of the former USTs acid product islands Boring B-3 was not completed due to drilling "refusal " It appeared that this "refusal" was caused by something metallic in nature, possibly former product piping Two additional borings were attempted near Boring B-3 Both of these borings were also terminated at a depth of 4 feet bgs due to drilling "refusal " Total petroleum hydrocarbons calculated as gasoline (TPH-g) was not detected in the soil boring samples with the exception of 56 parts per million (ppm) reported in Boring B-3 at 2 feet bgs Benzene was not detected in any of the collected soil samples Soil analytical results are presented on Figure 2 Dissolved hydrocarbon impact on site is low (with the exception of Well MW-2 and recently MW-7) In many cases the dissolved TPH-g and volatile organics compounds (VOCs) are mixed Well MW-2 is located along the downgradient property boundary and downgradient of the existing USTs Groundwater samples collected March 1, 1998, from this well contained TPH-g and benzene concentrations of 280 and 2 8 parts per billion (ppb), respectively Well MW-7 is located on the southeast corner of the site During the March 1, 1998 sampling event, TPH-g, benzene, and methyl tertiary-butyl ether (MtBE) were detected at 330 ppb, 40, and ppb, respectively EXCAVATION AND REMOVAL ACTIVITIES The product lines, three hoists, and two waste oil tanks were removed between December 1997 and January 1998 by Wendt Construction (Wendt) All sampling activities were conducted by PEG personnel Ecology Control Industnes (formerly Erickson, Inc) removed product lines, three hydraulic lift hoists, and two waste oil tanks from the premises and transported them to their Richmond, California facility for disposal Hoist and Waste Oil UST Sampling On December 23, 1997 samples were collected from beneath three hoists and one waste oil tank (Figure 4) One soil sample was collected at approximately 8'feet bgs from beneath each of the three hoist locations (Hoists 1 through 3) and analyzed for oil and grease (O & G) A maximum detection of 2,700 mg/kg was reported at Hoist i Excavation, removal, and sampling activities of the hoists and one waste oil tank, hereafter referred to as "waste oil tank 1," on December 23, 1997 were observed and approved by Mr Michael Kith of the SJCPHS-EHD The 1,000-gallon waste oil tank appeared to be in good condition, with no apparent holes or cracks noted during removal The waste oil tank 1 pit was sampled on each end at a depth of 11 feet bgs The samples were analyzed for TPH-g, TPH calculated as diesel (TPH-d), benzene, toluene, ethylbenzene and total xylenes (BTEX), oil and gas (O & G), VOCs, semi volatile organics (SVOCs), CAM 5 metals (Cadmium, Chromium, Lead, Nickel, and Zinc) and polychlorinated biphenyls (PCBs) The maximum concentrations of TPH-g and TPH-d were detected in sample WO-1 at 170 mg/kg and 5,300 mg/kg, respectively WO-1 also 920-119 1 A/rKPULRPT Doc