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ATC Associates Inc. V TC 1117 Lone Palm Avenue, Suite 201 Modesto, California 95351 209-579-2221 fax: 209-579-2225 AS SO C I ATE S INC . Industries Inc. (RESNA) hand augured 19 shallow soil borings to evaluate the extent of petroleum hydrocarbons in soil in the vicinity of the product line leak. Soil samples were collected from approximately four feet bgs and screened for possible VOC vapors using a photo ionization detector ( PID) . PID readings ranged from 0 to 1 , 032 parts per million (ppm) - In March and April 1991 , to provide additional information regarding subsurface conditions at the site, RESNA supervised the drilling of five borings that were completed as groundwater monitoring wells MW- 1 through MW-5. Petroleum hydrocarbon constituents were limited in the soil sample collected from 2 .5 feet bgs in boring MW-2 . Analytical results of groundwater samples indicated that wells MW-3, MW-4 , and MW-5 contained detectable petroleum hydrocarbons . Quarterly monitoring and sampling of the groundwater monitoring wells on Site was initiated in October 1991 . Refer to Table 1 for a historical summary of adsorbed phase analytical results. In July 1991 , RESNA personnel witnessed the removal of a 2 , 000-gallon capacity regular gasoline UST and the associated product line. No holes were observed in the UST. Soil samples collected from beneath the UST and product line reported only toluene at 0 . 045 milligrams per kilogram (mg/kg) . In September 1993 , RESNA supervised the advancement of a soil-boring that was completed as groundwater monitoring well MW-6 . Soil encountered during drilling was monitored for organic vapors using a PID . No evidence of soil contamination was noted . Analytical results of groundwater samples reported only toluene was detected , at a concentration of 38 micrograms per liter ( Ng/L) . Refer to Table 2 for a historical summary of dissolved phase analytical results . In August 1995, due to infiltration of organic debris in groundwater monitoring well MW-4 , Smith Environmental Technology Corporation (Smith) abandoned MW-4 by over-drilling the PVC casing and sand pack from the well boring with 8-inch diameter hollow-stem augers. Smith also supervised the advancement of a boring for groundwater monitoring well MW4R, which replaced well MW-4. Analytical results of the soil samples collected from the boring for monitoring well MW-4R reported petroleum hydrocarbons were detected only in the sample collected from 6 . 5 feet bgs . In January and February 1996, SECOR advanced ten soil borings at the Site . Soil samples and groundwater grab samples were collected . Only one soil sample contained detectable concentrations of petroleum hydrocarbons at low levels . Groundwater samples collected from borings SB2 and SB26 had reported elevated concentrations of petroleum hydrocarbons and trace amounts of free product. In March 1999 , Pile Construction removed one 6 , 000-gallon capacity and one 4 ,000- gallon capacity UST. According to the Pile Construction Underground Tank Removal Sampling Results for King Island Resort, 11530 West Eight Mile Road, Stockton, KIR 2009 WP for Pilot 'resting.doe ATC Associates Inc. S:\Environmental\62514 — KIR ATC Project No. 54.62514.0001 Page 2