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� v 0 A S S O C I A T E S I N C Soil borings advanced along the levee, southwest of the location of the former USTs and the current AST location contained elevated concentrations of total petroleum hydrocarbons as ' gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), and methyl tertiary butyl ether (MTBE) The extent of impacted soil was defined and generally extended along the backside of the levee, west of the store The Ariel extent was approximately 200 feet in length and 65 feet in width and was limited to depths between 5 and 15 feet bgs Additionally, MTBE impacted soil extended eastward, between the store and office building ' The groundwater plume generally extended along the backside of the levee, west of the store, and was approximately 225 feet long and 70 feet wide Concentrations were highest in the boring adjacent to the former and current product lines The extent of TPHg in groundwater was not fully defined to the west and south but samples indicated that the borings in those directions were near the edge of the plume Additionally, TPHd and MTBE have migrated eastward 2.0 METHODS AND PROCEEDURES ' To evaluate the extent of petroleum hydrocarbons in the soil and groundwater, one soil boring was advanced on the levee at the location shown in Figure 2 All field activities were performed in accordance with ATC's Workplan for Monitoring Well Invtallation at King Island Resort, 11530 West Eight Mile Road, Stockton, California, dated July 17, 2000 This workplan was approved by PHS/EHD on April 2, 2001 2_1 Drilling Activities On April 5, 2001, an ATC geologist supervised the advancement of one soil boring to 30 feet ' bgs Soil boring MW7 was placed at a location on the levee as shown on Figure 2 Woodward Drilling Company, Inc , California C-57 License No 710079 advanced the boring using 8-inch O D hollow stem augers Soil samples were collected from boring MW7 at five-foot intervals in 1 stainless steel sampling tubes and were logged according to the Unified Soil Classification System Description of soil types encountered and sample collection intervals are presented on the well log contained in Appendix A ' 2_2 Soil Sampling and Anal sis Each soil sample was field screened with a Photo Ionization Detector (PID) for the presence of volatile organic compounds Sample tubes were then sealed at each end using Teflon tape and plastic end caps, labeled, and placed on ice Selected soil samples were kept on ice and delivered ' to State-certified Argon Laboratories (ELAP #2359) for chemical analysis Selected soil samples were analyzed for TPHg, and TPHd by EPA method 8015 modified, benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA method 8020, and methyl tert butyl ether (MTBE) by 1 EPA method 8260 1 W\625141reprnis\sup_suh_tnv doe 3