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' 04 August 2000 - - - - _ AGE-NC Project No 98-0521 - , Page 5 of 11 - - sample was extracted by lowering a modified Teflon bailer into the screen section of the temporary wells Samples were collected in three laboratory-supplied, 40-ml VOA vials containing 0 5 ml - - hydrochloric acrd(18%) as sample pi enervative The labeled vials were placed in a chilled container -under ice and transported under chain-of custody to MAI fol analysis _ -3 2 GROUND WATER MONITORING WELL INSTALLATION On 23 May 2000, three pilot soil borings (MWI through MW3) weie advanced utilizing a hollow stem auger drill rig for the-installation of ground water monitoring wells The monitoring well locations were advanced in the following ai eas 1) well MW-l was established south of the former UST location, 2) well MW-2 was established northeast of the former UST area and 3) well MW-3 ' - was established west of the formei USTs The drill rig and two-man crew were supplied by West y Hazmat Drilling of Rancho Cordova, California Collection and Anal 3 2 1 Soil Sample sis C y ' Each soil pilot boiing-was advanced to a depth of 20 feet bsg Soil samples were collected to chai acterize the subsurface soil profile and identify water-bearing units for monitoring well screen- placement Installation of the wells was performed using a truck-mounted CME 75-HT drill rig ' equipped with 8-inch continuous flight hollow-stem augers for borings MW 1 and MW3, while 12- inch continuous flight Hollow-stem augers were used foi boring MW2 r Samples were collected-from borings MW-I and MW-3 at five-foot intervals using a California- modified split spoon sampler loaded with three clean, 2 x 6-inch brass sleeves Upon soil sampler retrieval, the middle biass sleeve was removed fiom the sampler Soil samples weie preserved by ' covering both ends of the one brass sample sleeve with Teflon sheets, capping, and sealing with duct - tape The sample was then labeled and placed in a chilled container for subsequent transport under chain-of-custody to MAI for analysis = All sampling equipment was washed in an Alconox solution and rinsed twice with water pnor to each sampling run - - During drilling, augei returns weie monitored foi the presence of organic vapor using an organic ' _ N vapor analyzer(OVA)equipped-with aphoto-ionization detector(PID Thermo Environmental 580A, -10 0 eV, calibiated to isobutylene) Auger ieturns were placed in Department of Transportation (DOT) 55-gallon drums and stored on-site pending laboratory analysis and disposal at a licenced ' - -facility ' _ Advanced Geohnvironmental,Inc - -