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c' u ti.J 08 November 2000 AGE-NC Project No. 95-0142 Page 5 of 9 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from the PHS-EHD. In addition, an update to the health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, the ground water extraction well location will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. DRILLING, SOIL SAMPLING AND WELL INSTALLATION/DEVELOPMENT AGE proposes to install two six-inch diameter ground water extraction wells to evaluate the feasibility of ground water extraction at the site.The proposed ground water extraction well will be placed in the area of highest hydrocarbon and MTBE contamination at the site in the former UST area and 15 feet south east of former UST area(See Figure 2). The extraction wells will be screened from 30 to 60 feet bsg to address highly impacted soil zone from 25 to 60 feet bsg and the most impacted ground water. Following installation, the extraction well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well installation and development are presented in Sections 4.2 and 4.3, respectively. The soil boring will be advanced with 8.25-inch and 15-inch hollow-stem augers. The 8.25-inch augers will be utilized to advance the initial pilot boring and to collect soil samples. Soil samples will be collected at 5-foot intervals from 10 feet bsg to total depth using a California split-spoon sampler and brass sleeves. Each soil sample sleeve will be labeled with boring location, vertical depth, sampling time, date and sampler's initials, and will be transferred to a DHS-certified analytical laboratory under chain of custody for laboratory analysis. All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox. All augers will be cleaned prior to advancement in each boring location. Following well installation, the well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping and sampling. Procedures for well installation and development are presented in Sections 4.2 and 4.3.; respectively. Advanced GeoEnvironmental,Inc.