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cealorcalTechnaslnc Page 2 In Situ Remediation Pilot Test Work Plan Project No 507 2 June 10,2003 ' 2.0 SITE CHARACTERISTICS The site has been investigated through the use of soil borings, soil sample geotechnical and ' chemical analyses, monitoring well installation and groundwater monitoring with chemical analyses This section summarizes the data gleaned from these efforts ' 2.1 Geology t Figures 4 and 5 are cross section diagrams illustrating the site geology (see Figure 2 for locations of the cross section) The geology of the site has been field logged as predominately clays and sandy clays with lesser amounts of silts and sands In May 2001, soil samples from borings SB-6, MW-7, MW-10 and MW-109 were submitted to Cooper Testing Lab Inc (Cooper) for geo- technical analysis The results of the Cooper analyses are summarized in the following table Sample Particle Size Distribution Soil Gravel % Sand % Silt % Clay % Classification MW-7 @ 20' - 188 467 34 5 SILT w/sand ' MW-10 @ 25' - 73 590 33 7 SILT w/trace sand MW-10 @ 30' - 258 54 1 20 1 SILT w/sand MW-109 @ 75' - 30 553 41 7 CLAY silty SB-6 @ 35' 05 83 7 98 60 Silty SAND ' Sample Permeability Organics Density Porosity (cm/sec) % (dry) % ' MW-7 @ 20' 1 x 10E-7 2 1 995 4308 MW-10 @ 25' 1 x 10E-6 1 6 905 48 18 ' MW-10 @ 30' 9 x 10E-7 1 3 93 9 4624 MW-109 @ 75' 3 x 10E-6 20 825 5275 SB-6 @ 35' 2 x 10E-4 08 103 8 3842 ' The occurrence of predominantly fine grain units was confirmed as evident in the above table The clayey soils in the upper 20 ft of MW-109 contained prominent field evidence of ' contamination - odor and staining The 80-foot sample in MW-109 had a faint hydrocarbon odor, and the OVM detected 19 parts per million organic vapors The deeper soil encountered in SB-109 was a blue/grey to blue/green color so it was difficult to visually determine when drilling had progressed past the contamination