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' 15 January 1997 <br /> . AGE-NC Project No 95-0137 <br /> Page 2 of r6 <br />' Upon sample retneval,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, under ice and transported <br /> under chain-of-custody to McCampbell Analytical, Inc (MAI), in Pacheco, California <br /> All sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination <br /> 1 <br /> 22 SOIL LOGGING <br /> Soil was extruded from the duplicate brass sleeves and screened for the presence of organic vapor <br /> using a photo-ionization detector (PID Thermo Enviroiunental 580A, 10 0 eV, calibrated to <br /> isobutylene), and the readings were recorded on the Boring Logs (Appendix A) The soil Xras <br /> described in accordance with the Unified Soil Classification System <br />' 2 3 . GRAB GROUND WATER SAMPLE COLLECTION <br />' . Grabground water samples were collected from probe borings B14, B16 and B17 using a Geopi obe <br /> water sampling assembly For the sampling assembly, probe rods were fitted with a retractable <br /> t ground water screen and advanced to the total depth of each probe boring, the rods were then pulled <br /> four feet upward, exposing the screen at total depth to allow ground water to flow into the screen <br />' A bailer fitting was then placed on the end of 3/a-inch diameter polyethylene tubing, inserted through <br /> the rod assembly into the exposed screen,through which water was manually pumped Groundwater <br /> was encountered in each probing at a depth of approximately 20 feet bsg <br />' Upon collection,water samples were transferred into three 40-m1 EPA-approved vials and one 1-liter <br /> amber bottle Each sample container was labeled with the following information location, time, <br />' date and sampler's initials Each sample was logged on a chain-of-custody form, placed in a chilled <br /> container and transported to a state-certified laboratory for analysis <br />' After sample retrieval, the sampler was disassembled and cleaned between each sampling event <br /> New PVC tubing was used for each sample <br /> j <br /> 24 LABORATORY ANALYSIS <br /> Selected soil and ground water samples were analyzed for total petroleum hydrocarbons quantified <br /> • as gasoline and diesel (TPH-g and TPH-d), volatile aromatic compounds (benzene, toluene, ethyl <br />