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• 07 March 2000 AGE-NC Project No. 98-0432 Page 2 of 6 Teflon sheets, capped and sealed with tape. The preserved samples were labeled with boring designation, sample depth, date and time of sampling and the sampler collector's initials. The samples were stored in a chilled container and transported under chain-of-custody to Precision ' Enviro-tech (PET) of Stockton, California, a Department of Health Services (DHS)-certified. laboratory. Select samples were analyzed for the following: ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 801-5 Modified and • Volatile aromatic compounds:benzene,toluene,ethyl-benzene and total xylenes(BTEX)and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8260 Modified. 2.1.1. EQUIPMENT DECONTAMINATION ' Hollow stem augers were steam-cleaned prior to boring advancement. Sampling tools and brass sleeves used for.sample collection. were thoroughly washed -with a solution of Alconox and '. thoroughly rinsed with tap water prior to each sampling run. Following drilling activities, rinseate generated from decontaminating the equipment was placed in properly labeled D.O.T. model 17H 55-gallon drums and stored on-site in an area lacking public access. 1 2.1.2. WELL COMPLETION Soil borings MW-1 through MW-4 were completed as conventional ground water monitoring wells. ' with the same designations. Field numbering of the wells was determined prior to each well's installation to aide the PHS-EHD in field inspections. A summary of the construction details are depicted on the boring logs (Appendix A). 1 . 2.2. SOIL LOGGING , ' During drilling, auger returns were monitored for the presence of organic vapor using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID: Thermo Environmental 580A, ' 10.0 eV, calibrated to isobutylene). Auger returns were placed on plastic and stored on the western edge of the site, pending laboratory analysis. ' Duplicate soil samples were extruded from their sleeve and were screened for the presence of organic vapor using the OVM. The OVM readings were recorded on boring logs. The soil was then visually described in accordance with the.Unified Soil Classification System(see boring logs, Appendix A).