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J I 20 April 2007 AGE-NC Project No. 95-0167 Page 3 of 10 3 .2, OBSERVATION WELL INSTALLATION AGE proposes to advance and sample p=42lot soil borine forinstallation and completion of an observation well (OBW- 1 ). The boring will be advanced to approximately 20 feet below surface grade (bsg), utilizing a truck-mounted, hollow stem drill rig equipped with 84nch diameter hollow- stem augers. AGE proposes installation of the observation well adjacent to boring P6, to monitor the dissolved concentrations detected in boring P6 and provide for =asmcmar,ts of the two proposed feasibility pilot studies. Field procedures for the installation of the observation well are presented in Section 4.2. . 3 .3 , GROUND WATER EXTRACTION AND SVE WELL INSTALLATION AGE proposes to advance one pilot soil boring for installation and completion of a ground water extraction well (EW- 1 ), utilizing a CME-75HT drill rig equipped with 12-inch hollow stem augers. The pilot boring will be advanced to approximately 36 feet bsg; the total depth of the well boring may vary according to hydrogeologic/geologic conditions encountered during drilling. AGE proposes to install the extraction well adjacent to well MW- 1 , the location of greatest dissolved hydrocarbon contamination. AGE proposes to advance and sample one pilot soil boring for installation and completion of an SVE well (VW- 1). The boring will be advanced to approximately 15 feet below surface grade (bsg), utilizing atruck-mounted, hollow stem drill rig equipped with 12-inch diameterhollow-stem augers. AGE proposes installation of a single-completed SVE well adjacent to boring P3 , the location of the former UST dispenser release and source of significant soil hydrocarbon contamination. Fieldprocedures for the installation of the extraction well and SVE well are presented in Section 4.3 . and Section 4.4. , respectively. The boring locations were chosen based on data collected during the UST removal and subsequent over excavation. Proposed boring locations are depicted in Figure 3 . 3 .4 , SOIL SAMPLING Selected soil samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents : • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M; • Benzene, toluene, ethylbenzene and xylenes (BTEX) and fuel additives, including tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl - Advanced GeoEnvironmental, Inc.