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09 April 2002 <br /> AGE-NC Project No . 97-0301 <br /> Page 7 of 14 <br /> 11 <br /> One 2-inch diameter multi-level ground water monitoring well (MW- 11) located <br /> approximately 80 to 100 feet southeast of MW-7 and screen intervals at depths between 30 <br /> and 40 feet bsg (A), 70 and 75 feet bsg (B), 95 and 100 feet bsg (C) and between 120 and <br /> 125 feet bsg (D); <br /> Proposed well locations are depicted in Figure 2; general lithology and the estimated extent of <br /> petroleum-impact to soil beneath the site is depicted in cross sectional views D-D ' and E-E ' in <br /> Figures 3 and 4, respectively. AGE has developed a preliminary subsurface model of the site soil <br /> - <br /> stratigraphy comprised ofavadose (unsaturated) zone and four hydrologic units (Cone Penetrometer <br /> 1. 1 Testing Site Investigation - Third Quarter 2001, dated 25 October 2001). The proposed ground water <br /> extraction, soil vapor extraction, air sparge and ozone sparge wells will be screened through First <br /> Zone ground water and in areas of known petroleum-impacted soil and ground water. The proposed <br /> multi-level ground water monitoring wells will be screened to delineate the vertical and later extent <br /> of on- and off-site petroleum-impacted ground water. Procedures for well installation are presented <br /> in Section 4.2. <br /> I � <br /> Following well installation, each water well will be developed to maximize water flow into the well <br /> Ll <br /> and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. <br /> Procedures for well installation and development are presented in Sections 4.2 and 4.3 , respectively. <br /> r <br /> -- 3 .3 . GROUND WATER AQUIFER PUMPING TEST <br /> Following installation of EW- 1 , a24-hour aquifer pumping test will be performed in the First Water <br /> Zone at the site to evaluate a general radius of influence and capture zone during ground water <br /> r � extraction. The proposed aquifer pumping test will be designed to obtain general aquifer <br /> characteristics such as hydraulic conductivity, storativity, transmissivity and draw-down at a constant <br /> pumping rate. Procedures for the pumping test is presented in Section 4.4. <br /> 3.4 SOlI�VAP-OR-EXTRACTION PILOT TEST - <br /> i _ . <br /> Following installation of wells VW- I and VW-2, an eight-hour SVE pilot study is proposed at the <br /> site to evaluate SVE as a remedial alternative; the results of the SVE pilot test will provide data to <br /> calculate an effective SVE radius of influence for design of a SVE remediation system. Procedures <br /> L for the SVE pilot test are presented in Section 4 . 5 . <br /> i <br /> Advanced GeoEnvironmental, Inc. <br /> iJ <br />