Laserfiche WebLink
LO 17 April 2002 <br /> AGE-NC Project No. 01-0872 <br /> Page 4of6 <br /> 3.5. GROUND WATER SAMPLING <br /> Grab ground water samples were collected from each probe boring using a temporary PVC screen. <br /> The probe rods were advanced to approximately 30 feet bsg.The hollow steel rods were then pulled <br /> out, and a screened casing was inserted into the saturated zone. Ground water was allowed to enter <br /> the casing, and samples were retrieved using a modified PVC tubing bailer. Sufficient sample was <br /> collected from each boring to fill three 40-m1 EPA-approved volatile organic analysis (VOA)vials <br /> r. containing 0.5 ml 18% hydrochloric acid as a sample preservative and one 1-liter amber bottle <br /> without the sample preservative. Ground water sample containers were labeled with probe boring <br /> designation, date, time, and sampler's initials. The preserved samples were logged on a <br /> chain-of-custody form,placed in a chilled container and transported to CTEL for analysis. <br /> a. 3.6. GROUND WATER ANALYSES <br /> Each grab ground water sample was analyzed for: <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified; <br /> BTEX and MTBE in accordance with EPA Method SW846 8021; and <br /> • MTBE, TBA, DIPE, ETBE, TAME, EDB and 1,2-DCA by EPA Method 8260B. <br /> 3.7. EQUIPMENT DECONTAMINATION <br /> Prior to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly <br /> rinsed with clean water after washing with a solution of Alconox. Geoprobe rods were thoroughly <br />+- cleaned prior to soil probe boring advancement. <br /> 4.0. FINDINGS <br /> Soil descriptions were utilized to construct the site geological model;laboratory analysis of soil and <br /> ground water samples were utilized to assess the petroleum hydrocarbon-impact on soil and ground <br /> water. <br /> L <br /> LV <br /> 4 Advanced GeoEnvironmental,Inc. <br />�r <br />