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r <br /> ! 24 August 1995 <br /> it AGE-NC Project No 95-0144 <br /> ' Page 3 of 8 i <br /> Probings GPI to GP4 were established near the former location of tank No 8, probings GPS to GP8 <br /> ' were advanced near the former location of tank No 1, probings GP9 to GP 12 were advanced near <br /> the former location of tank No 2, and probings GP 13 to GP 17 were advanced near the former <br /> location of tank No 3 (Figure 2) All probings were backfilled to surface grade using Portland <br /> Cement <br /> ' 3 3 I GEOPROBE SOIL SAMPLING <br /> ' Probings GPI to GP15 were advanced to 25 feet Discrete soil samples were collected in each <br /> probing at 5 foot intervals beginning at 10 feet (5 feet for GP9, 15 feet for GP 14)using a l 3/8-inch <br /> diameter, two-foot long, piston type sampler loaded with four 6-inch long precleaned brass sleeves <br /> ' To avoid cross contamination, the sampling equipment was washed in an Alconox solution and rinsed <br /> with water prior to each sampling run For each sample, both ends of the second sleeve were covered <br /> with aluminum sheets, capped and sealed with tape For probings GPS to GP 12, a second sleeve was <br /> ' also preserved to provide enough sample for the additional analyses <br /> 3 3 2 LOGGING <br /> ' Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapors <br /> using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to <br /> isobutylene), and the readings were recorded on the Boring Logs The soil was described in <br /> ' accordance with the Unified Soil Classification System (see Boring Logs, Appendix C) <br /> 3 3 3 GEOPROBE GROUND WATER SAMPLING <br /> Probings GPI, GPS, GP12, GP14, GP16 and GP17 were advanced to depths of 30 5 feet using a <br /> ' Geoprobe water sampler The push rods were then pulled back 2 feet to expose the water sampler <br /> screen interval Ground water was allowed to enter the sampler, and samples were retrieved using <br /> a modified PVC tubing bailer The sampler was disassembled and cleaned between each sampling <br /> ' event New PVC tubing was used for each sample Samples were collected in 40-m1 EPA vials <br /> preserved with hydrochloric acid, 1-liter amber bottles and plastic bottles preserved with nitric acid <br /> ' 34 SAMPLE ANALYSES <br /> ' Samples were stored on ice and selected samples transported under chain-of-custody to MAI <br /> Samples from GPI to GP4 were analyzed for volatile halocarbons in accordance with EPA method <br /> r' <br /> 1 - <br />