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Ms Margaret Lagono Page 2 of 8 145 feet below ground surface (b s) Electric CPT data transmitted from m the cone hp provided information on soil behavior by measuring penetration resistance, friction ratio, and pore pressure ' Correlation of soil behavior to soil type was made electronically, based on a soil classification chart interpreted by Robertson & Campanella (1983) The locations of the CPT borings are shown on Figure 2 Copies of CPT data and logs are included in Attachment A ' Confirmation Boring Drilling and Sampling ' A total of five confirmation soil borings were drilled and sampled Confirmation borings CBI/CBIA and CBS were twins to CPT borings CPTI and CPTS, respectively Boring CBI/CB1A was intended to investigate current vadose soil conditions immediately beneath the tankpit as well as to investigate the ' venccal extent of soil contamination Boring CB5 was intended to investigate the vertical extent of groundwater contamination immediately downgraciient of the tankpit Bonngs C132 through CB4 were intended to establish current soil contaminant concentrations in the known area of impact Borings CBI though C134 were drilled using a hollow stem auger ng Borings CB I A and C135 were advanced by the direct push method using the CPT rig The locations of the confirmation borings are shown on Figure 2 Boring logs are included in Attachment A 1 Boring CB I/CB 1 A On February 23, 2001, Precision drilled boring CB 1 to a depth of 70 feet using a hollow stem auger drill rig in order to investigate soil conditions directly beneath the former tankpit Soil samples were collected from the boring at five-foot intervals The samples were collected by using an 18-inch long core sampler lined with new 2 T/2-inch diameter brass sleeves, affording soil identification, subjective evaluation for contamination and screening for volatile constituents with a photoionization detector (PID) Soil samples collected for analysis were sealed, labeled, and immediately placed in an iced cooler for transport and submittal under chain of custody protocol to Argon Laboratories (FLAP 2359) ' Analysis consisted of TPHg by EPA Method 8015, BTEX by EPA Method 8020 and gasohne oxygenate additives,DCA,EDB methanol and ethanol by EPA Method 8260 ' In order to collect deeper soil samples, on March 9, 2001 Precision advanced boring CB1A immediately adjacent to CB 1 utilizing a 25-ton CPT rig A two-foot long GeoProbe` type soil sampler lined with butyrate sleeves was used to collect the samples, affording soil identification, subjective 1 evaluation for contamination and screening for volatile constituents with a PID CPT interpretations of soil type were confirmed through traditional soil logging techniques using ASTM Designation D2488- 90, which is equivalent to the Unified Soil Classification System Soil samples selected for analysis were ' sealed, labeled, and immediately placed in an iced cooler for transport and submittal to the laboratory for analysis as above In addition, two soil samples were submitted to Cooper Testing Laboratory for analysis of grain size distribution, organic carbon content, porosity and hydraulic conductivity ' Boring On February 20 2001, Precision advanced direct push boring C135 utilizing a 25 ton CPT drill ng to ' collect discrete soil and groundwater samples within strata identified from CPT data A two-foot long GeoProbe© type soil sampler lined with butyrate sleeves was used to attempt soil sample collection After the collection of one soil sample at the depth of 85 feet the sampler failed and repeated attempts to collect deeper soil samples were unsuccessful I Aarkkloau�cmtEorvg.doc