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Ms Vicki McCartney ProjectNo 880040 IA02010000 <br /> March 23, 2005 <br /> Page 2 <br /> Due to close proximity of groundwater, the maximum excavation depth was <br /> approximately 10 feet bgs <br /> In August 2000, five Geoprobe° borings (GP-1 through GP-5) were made by <br /> direct-push The borings were advanced to groundwater and a discrete water sample <br /> was collected Following groundwater sample collection, the borings were continued to a <br /> maximum depth of 30 feet bgs <br />' In September 2000, three groundwater monitoring wells (MW-1 through MW-3) were <br /> installed at locations selected based on the Geoprobe investigation results (Figure 1) <br /> tQuarterly groundwater monitoring and sampling was initiated via these wells in <br /> September 2000 <br /> In May 22 and 23, 2002, Shaw drilled one deep soil boring and installed monitoring <br /> wells (MW-4 and MW-5) in two other borings A dual phase extraction (DPE) test was <br /> 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 cone penetration <br /> test (CPT) borings Discrete groundwater samples collected from HydroPuncho borings <br />' mad adjacent to the CPT borings indicated the presence of methyl tert-butyl ether <br /> (MTBE) in groundwater northeast of the site, and that the vertical extent of MTBE <br /> appeared to be limited to within approximately 30 feet of the ground surface <br />' GROUNDWATER MONITORING <br /> On January 17, 2005, 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 /> methylbenzene, xylenes (BTEX), 1,2-dibromoethane (EDB), 1,2-dichloroethane <br /> ' (1,2-DCA), and for five gasoline oxygenates, MTBE, di-isopropyl ether (DIPS), ethyl <br /> tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA) <br /> using U S Environmental Protection Agency (EPA) Methods 8015GRO/8021B <br /> SHAW ENVIRONMENTAL, INC <br /> N 1sacDP120051Pp188018800401A Saa doc <br />