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Ms Vicki McCartney Project No 880-040 1A <br /> July 9, 2004 <br /> Page 2 <br /> areas were selected based on the January 7, 2000, sampling results Excavation was <br /> restricted laterally by concrete canopy footings and asphalt surfacing Due to close <br /> proximity of groundwater, the maximum excavation depth was approximately <br /> 10 feet bgs <br /> On August 15 and 16, 2000, five Geoprobe® borings (GP-1 through GP-5) were <br /> advanced using a direct push rig The borings were advanced to groundwater, at which <br /> time a discrete water sample was collected Following groundwater sample collection, <br /> the borings were continued to a maximum depth of 30 feet bgs <br /> On September 6, 2000, three groundwater monitoring wells (MW-1 through MW-3) <br /> were installed The well locations were selected based on the Geoprobe® investigation <br /> results Well locations are shown orY- glare 1 Quarterly groundwater monitoring and <br /> sampling was initiated in September 2000 9 3,u <br /> On May 22 and 23, 2002, Shaw observed the drilling of one deep soil boring and the <br /> installation of two additional monitoring wells (MW-4 and MW-5) A dual phase <br /> extraction (DPE) test was conducted from June 10 through 15, 2002 The DPE test was <br /> conducted by 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 HydropuncO borings advanced adjacent <br /> to the CPT borings indicated the presence of methyl tert-butyl ether (MTBE) in <br /> groundwater downgradient of the site, but the vertical extent of MTBE appears limited <br /> to within approximately 30 feet bgs <br /> GROUNDWATER MONITORING <br /> On June 22, 2004, 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), 1,2-dibromoethane (EDB), 1,2-dichloroethane <br /> (1,2-DCA), and for five gasoline oxygenates, MTBE, di-isopropyl ether (DIPE), ethyl <br /> tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA) <br /> Shaw Environmental,Inc <br /> N 1sacDP120041Prj188018800401A 4ab doe <br />