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Ms. Vicki McCartney Project No.: 880.040.1A.0110 <br /> May 23, 2003 <br /> Page 2 <br /> gasoline underground storage tanks and associated product lines and dispensers. `Diesel <br /> fuel has never been dispensed at the site. Pertinent site features are.shown on Figure 2. <br /> Product line upgrade was conducted in January 2000. After removal of dispenser <br /> plumbing, petroleum hydrocarbon impacted soil wase discovered beneath the western <br /> dispenser islands. Soil samples were collected from beneath the dispensers and along . <br /> the product lines at a depth of approximately 3.5 feet bgs. <br /> Five Geoprobe® borings (GP-1 . through GP-5) were advanced on <br /> August 15 and 16, 2000, by IT Corporation (IT) using direct-push technology. Each <br /> boring was advanced to groundwater, at which time a discrete water sample was <br /> collected. Following groundwater sample collection, each boring was advanced to a <br /> maximum depth of 30 feet bgs. <br /> Three groundwater monitoring wells (MW-1 through MW-3) were installed on <br /> September 6, 2000 by IT. The well`locations were selected based upon results of the <br /> Geoprobe® investigation. Quarterly groundwater monitoring has been conducted at the <br /> site since the First Quarter 2001 event. <br /> On May 23, 2002, Shaw installed off-site downgradient monitoring wells MW-4 and <br /> MW-5, and advanced deep boring SB-DEEP near existing monitoring well MW-1. <br /> Boring SB-DEEP was advanced to 55 feet bgs, at .which point soil samples were <br /> non-detect for -total petroleum hydrocarbon as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), or oxygenates. <br /> GEOLOGY AND HYDROGEOLOGY <br /> Boring logs from previous investigations.indicate that the subject site is-underlain by <br /> sand interbedded with clay, silty clay, clayey silt, sandy silt, and silty sand to the total <br /> depth explored of 54 feet bgs. Copies of boring and well logs, and well construction <br /> diagrams are included in Appendix A. - <br /> Groundwater was encountered beneath the site at depths ranging from 11 to 15 feet bgs. <br /> Groundwater flow beneath the site has historically been to the northeast. <br /> I <br /> SHAW ENVIRONMENTAL,INC. <br /> N:\sacDP\2003\Prj\880\8800401 A.3ac.doc <br /> i <br />