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Co-extract.on Well Installation Report November 4, 1997 • The investigative procedures have been conducted in accordance with appropriate ra riate state and local ' guidelines The scope of work performed Included • preparing a Work Plan, checking drilling locations for presence of underground utilities, and obtaining the required well permit, • drilling four soil bonngs, collecting one soil sample per boring, • Installing one groundwater/air co-extraction well in each of the four boreholes, ' 6 arranging for analyses of soil samples, and ' 0 preparing this investigative report 2.1 Soil Borings and Soil Sampling On October 8 and 9, 1997, four exploratory borings (EW-1, EW-2, EW-3 and EW-4) were drilled at preselected locations (see Figure 2) All locations were marked and checked for ' underground utilities by Underground Services Alert, none were detected All borings were drilled to a depth of 30 feet below the ground surface (bgs) A soil sample for laboratory analysis was collected from a depth of 16 % to 17 feet bgs from the apparent capillary fringe ' (groundwater was measured at a depth of 18 feet bgs) For well logging purposes, the soil was examined at the surface as it was drilled out of the borehole It should be noted that logging in this manner is hampered by the rolling and mixing of soil as it Is brought to the surface by auger ' rotation and may not agree with logs prepared from soil samples Soil was described on well logs using the United Soil Classification System The samples were submitted to a state-certified ' analytical laboratory for analyses of the presence of Total Petroleum Hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and xylenes (BTEX), and methyl tertiary butyl ether (MTBE) ' Soil sampling and sample handling procedures are presented in Appendix A The well logs are presented in Appendix B ' 22 Groundwater/Air Co-Extraction Well Installation ' On October 8 and 9, 1997, the four soil borings were converted to groundwater/air co-extraction wells Ms Margaret Lagono, of the SJCPHS, was present to witness the surface sealing procedures for each well The selection for the locations of the groundwater/air co-extraction ' wells was based on the northerly groundwater flow direction and the apparent extent of gasoline impacted soil and groundwater As shown on Figure 2, co-extraction well EW-1 was installed at the location of the former UST in the southwestern portion of the impacted area, co-extraction ' well EW-2 was installed in the northwestern portion of the impacted area, co-extraction well ' OST coexwell rpt 2