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t Ms Vicki McCartney Project No 880040 lA 02010000 ' June 10, 2005 ' Page 2 Due to close proximity of groundwater, the maximum excavation depth was approximately 10 feet bgs IIn August 2000, five Geoprobe borings (GP-1 through GP-5) were made by direct-push The borings were advanced to groundwater and a discrete water sample was collected Following groundwater sample collection, the bonngs were continued to a maximum depth of 30 feet bgs In September 2000, three groundwater monitoring wells (MW-1 through MW-3) were 1 installed at locations selected based on the Geoprobe investigation results (Figure 1) Quarterly groundwater monitoring and sampling was initiated via these wells in September 2000 In May 22 and 23 2002 Shaw drilled one dee soil boring and installed monitoring y P g g wells (MW-4 and MW-5) in two other borings A dual phase extraction (DPE) test was conducted from June 10 through 15, 2002 The DPE test was conducted by simultaneously extracting soil vapor and groundwater from well MW-1 On September 2 and 3, 2003, Shaw observed the advancement of four cone penetration I test (CPT) borings Discrete groundwater samples collected from HydroPunch® borings madeadjacent to the CPT borings indicated the presence of methyl tert-butyl ether (MTBE) in groundwater northeast of the site, and that the vertical extent of MTBE appeared to be limited to within approximately 30 feet of the ground surface Routine groundwater monitoring has been performed at the site since September 2000 There are five groundwater monitoring wells at the site, all with total depths of approximately 24 feet GROUNDWATER MONITORING ' On April 18, 2005, groundwater samples and depth-to-water data were collected from monitoring wells MW-I through MW-5 Groundwater samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, 'I SHAW ENVIRONMENTAL,INC N\sac DP1200511rj188W800401A 5Adoc