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cl ologual rech&cs 144 Page 3 Soil Gas Survey Report Project No 701 2 July 23,2002 ' During the installation on May 23, it was noted that the adjacent cow pasture had been irrigated the day before Standing puddles of water were evident in various places in the ' proposed grid area Because of this saturation of the soil, GTI deeded to leave the modules placed in the pasture (10 total) for a week longer than the modules placed on the Ted Peters site When the pasture modules were recovered on June 13, the soil was relatively dry On June 6 and June 13, 2002, Joseph Angulo of GTI mobilized to the site to retrieve the modules The modules were located, retrieved, placed in their individual containers and placed into an ice chest chilled to 6 degrees Celsius The samples obtained on June 6 were held in a GTI freezer with the trip blanks until June 13 Only 17 of 20 buried modules were ' retrieved successfully, with three found in pieces lying on the ground Two of the modules (#40211$ & #402140) had been disturbed by cows in the pasture and one (#402122) had been evicted by rodent burrowing The Chain of Custody was filled out and the samples ' sent to W L Gore on June 13, 2002 W L Gore received the samples the next day—June 14, 2002 ' 1.2 Results The modules were tested for "Gore's Fuel Hydrocarbon List" A list of these constituents, the Chain of Custody, the report issued by W L Gore and the contour maps are included in Appendix A Numerous chemicals were detected but many were in amounts too low to be ' of concern Of interest are 1 Gasoline range compounds, including methyl tertiary butyl ether (MTBE) and benzene, ' toluene, ethyl benzene& xylene (BTEX) 2 Diesel range compounds Gasoline and diesel were detected in an area approximately 75 feet northeast of well MW-7 BTEX was detected in the vicinity of well MW-7, and extending laterally to the north, northeast and south MTBE was not detected in any of the modules 1.3 Discussion ' This survey was designed to investigate the possible presence of both gasoline and diesel range petroleum hydrocarbons in the northwest portion of the Ted Peters property and the eastern portion of the Hedegard Property As such, the discussion of the survey will be ' organized by gasoline results and then by diesel results Refer to Appendix A for the color- coded W L Gore maps In comparing the maps it is important to keep in mind that even though the same color pattern was used in each map, the colors do not represent the same ' mass of contaminants recovered by the Gore-Sorber The purpose of the map is to show relative high and low concentrations of each analyte