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i <br />' 23 July 2004 <br /> • AGE-NC Project No 99-0624 <br />' Page 4 of 8 <br /> t <br />' 22 ADVANCEMENT OF SOIL PROBE BORING <br /> On 21 April 2004, two soil probe borings(B4 and B5)were advanced in the current dispensei area <br />' under EHD oversight The probe borings were advanced to a total depth of approximately 30 feet bsg <br /> utilizing a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1 25-inch diameter <br /> probing rods, the probing unit advances soil probe borings using a hydraulic hammer to drive soil <br />' and ground water sampling tools to specified depths <br />' 2 2 1 Soil Sample Collection <br /> Discrete soil samples were collected using the Geoprobe push-driven 2-inch diameter soil sampler <br />' fitted with four six-inch long brass sleeves at 5-foot intervals,beginning at 5 feet bsg Soil samples <br /> were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and <br /> sealing with tape Each preserved sample sleeve was labeled with soil boring location, depth, time, <br />' date and sampler's initials and was stored in a chilled container under ice <br />' Soil encountered in the borings were visually classified on a boring log by an AGE geologist in <br /> accordance with the Unified Soil Classification System (USCS), the soil boring log is provided in <br /> Appendix B Additionally, soil samples were field-screened for the presence of volatile organic <br />' compounds using an organic vapor meter(OVM) equipped with a photo-ionization detector (PID <br /> Thermo Environmental 580B, 10 0 eV,calibrated to isobutylene), the concentration readings were <br /> recorded on the boring log <br /> 2 2 2 Laboratory Analysis of Soil <br /> 1 Selected soil samples were transported under chain-of-custody procedures to CTEL and analyzed <br /> for the constituents listed in section 2 14 <br /> 1 <br /> 2 2 3 Equipment Decontamination and Borehole Abandonment <br />' All probing rods used were cleaned prior to advancement in each probe boring location The <br /> sampling equipment was washed in an Alconox solution and nnsed with water prior to each <br />' sampling run to avoid cross-contamination At the conclusion of soil boring activities, the bonngs <br /> were permanently sealed to prevent vertical migration of contaminants Under EHD oversight,the <br /> borehole was backfilled with cement slurry from the total depth to surface grade - <br /> 1 <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />