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26 May 1998 <br /> AGE-NC Project No 96-0266 <br /> ' Page 3 of 9 <br /> ' sample <br /> Discrete soil samples were collected from each probe boring at 5-foot intervals beginning at 5 feet <br /> ' bsg Soil samples were collected using a 2 15-inch diameter, two-foot long, piston type sampler <br /> loaded with four pre-cleaned 1 375-inch by 6-inch brass sleeves The sampling equipment was <br /> washed m an Alconox solution and rinsed with water prior to each sampling run to avoid cross- <br /> contamination <br /> Upon sample retrieval,both ends of the second brass sleeve were covered with Teflon sheets, capped <br /> ' and sealed with tape Samples were then placed in a chilled container and transported under chain-of- <br /> custody to McCainpbell Analytical, Inc (MAI) in Pacheco, California <br /> 3 12 SOIL LOGGING <br /> Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br /> using an organic vapor meter equipped with a photo-ionization detector (PID Thermo <br /> �• Environmental 580A, 10 0 eV, calibrated to isobutylene), and the readings were recorded on the <br /> Boring Logs The soil was described in accordance with the Unified Soil Classification System A <br /> typical vertical soil profile is depicted in Appendix A <br /> 3 1 3 GRAB GROUND WATER SAMPLE COLLECTION <br /> ' Grab ground water samples were collected from every probe boring, except P24b,using a temporary <br /> PVC screen Ground water was allowed to enter the screen and samples were retrieved using a <br /> ' modified PVC tubing bailer A discrete grab water sample was collected from P24b at a depth of 35 <br /> feet bsg using a Geoprobe water sampling assembly The sample assembly was extended into ground <br /> water,then pulled back to expose a water sampler screen interval Ground water was allowed to enter <br /> ' the sampler, and samples were retrieved using a modified PVC tubing bailer <br /> ' After sample retrieval, the sampler was disassembled and cleaned New PVC tubing was used for <br /> each sample Samples were collected from the borings into 40-m1 EPA-approved vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative The samples were placed in a chilled <br /> ' container and transported under chain-of-custody to MAI for analysis <br /> ' 3 1 4 LABORATORY ANALYSIS OF SOIL AND GROUNDWATER SAMPLES <br /> . Selected soil and each ground water samples were analyzed for TPH-g, BTE&X in accordance with <br />