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{ <br /> Ms. Vicki McCartney <br /> Project 880-040.1A/0107 <br /> f. November 25, 2003 <br /> Page 2 <br /> f <br /> were selected based on the January 7, 2000, sampling results. Excavation was restricted <br /> laterally by concrete canopy footings and asphalt surfacing. Due to close proximity of <br /> groundwater, the maximum excavation depth was approximately 10 feet bgs_ <br /> On August 15 and 16, 2000, five Geoprobe° borings (GP-1 through GP-5) were completed <br /> using a direct push rig. The borings were advanced to groundwater, at which time a discrete <br /> water sample was collected. Following groundwater sample collection, the borings were <br /> continued to a maximum depth of 30 feet bgs. <br /> On September 6, 2000, three groundwater monitoring wells (MW-1 through MW-3) were <br /> installed. The well locations were selected based on the Geoprobe° investigation results. <br /> Well locations are shown on Figure 1. Quarterly groundwater monitoring and sampling was <br /> initiated in September 2000. <br /> _ On May 22 and 23, 2002, Shaw observed the drilling of one deep soil boring and the . <br /> installation of two monitoring wells (MW-4 and MW-5). A dual phase extraction (DPE) <br /> test was conducted from June 10 through 15, 2002. The DPE test was conducted by <br /> simultaneously extracting soil vapor and groundwater from well MW-1. <br /> On September 2 and 3, 2003, Shaw observed the advancement of four CPT borings. <br /> Discrete groundwater samples collected from Hydropunch° borings advanced adjacent to <br /> } <br /> the CPT borings indicated the presence of methyl tent-butyl ether (MtBE) in groundwater <br /> downgradient of the site, but the vertical extent of MtBE appears limited to within <br /> approximately 30 feet bgs. <br /> GROUNDWATER MONITORING <br /> On October 13, 2003, groundwater samples and depth to water data were collected from <br /> monitoring wells MW-1 through MW-5. Groundwater samples were analyzed for the <br /> presence of Total Petroleum Hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), and for five gasoline oxygenates (MtBE, di-isopropyl ether <br /> [DIPE], ethyl tert-butyl ether [ETBE], tert-amyl methyl ether [TAME], and tert-butyl <br /> alcohol [TBAD using U. S. Environmental <br /> Protection Agency {EPA} Methods <br /> Shaw Environmental,Inc. <br /> i�:lsacDP1200311'rj188018800401 A3ae.doc <br />