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CLEARWATER L, R O U_P I N C 2.0 INVESTIGATIVE METHODS 2.1 Well installation and Soil Sampling 2 11 Purpose and Scope In accordance with the scope of work outlined in the Workplan for Aquifer and Soil Vapor Extraction Pilot Testing dated March 20, 1995, Clearwater installed one groundwater recovery and two air sparge wells These wells were installed to provide data collection points in order to evaluate the feasibility of soil vapor extraction, groundwater extraction and air sparging as a remedial alternatives, and to be used in future remediation if any or all of those technologies proved viable 2 12 Soil Borehole Drilling and Soil Sampling Clearwater supervised the drilling of three soil borings for the installation of one ' recovery well (RW-1) and two air sparge wells (SW-1 and SW-2) on April 7, 1995 Drilling was performed by Mitchell Drilling Environmental, Inc using a CME 75 truck mounted drill rig equipped with hollow-stem augers Ten-inch diameter augers were used to advance the recovery well borehole and eight-inch diameter augers were used to advance the sparge well boreholes Soil samples were collected at five foot intervals from the recovery well borehole using brass tubes encased within a split-spoon sampler The soil sample collected at 14 5 feet below grade was retained for chemical analysis This sample was covered with teflon lined end caps, labeled, documented on a chain-of-custody form, and placed on ice in a cooler for transport to the project laboratory The soil sample was analyzed by Pace, Inc for concentrations of total petroleum hydrocarbons as gasoline (TPHg), and benzene, toluene, ethylbenzene, and xylene isomers (BTEX) by modified EPA Method 8015/8020 Soil samples were not collected during the drilling of the two sparge well boreholes Portions of each soil sample were retained for visual lithologic description by a Clearwater geologist using the Unified Soil Classification System, and for volatile organic headspace analysis using a flame-ionization detector (FID) FID readings were recorded on the well logs, which are included in Appendix A Augers and samplers were cleaned between each use to prevent cross- contamination A steam-cleaner was used to clean the augers, and a tri-sodium phosphate wash followed by a double rinse in clean tap water was used to clean the sampler Auger rinseate was stored on-site in labeled 55-gallon drums, and soil drill cuttings were stored on-site enveloped in visqueen pending removal and disposal by a licensed waste-hauler D-107, PAR/RAP 3 February 21, 1996 I