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27 February 2015 <br /> AGE-NC Project No. 96-0235 <br /> Page 5 of 10 <br /> will be presented in a report with the findings and recommendations. Electronic <br /> deliverable format (EDF) files of the laboratory analytical results will be submitted to the <br /> State of California GeoTracker database. <br /> 3.4. MONITORING WELL INSTALLATION DRILLING <br /> AGE proposes to advance two on-site and one off-site pilot soil borings to depths of <br /> approximately 60 feet bsg for the purpose of logging lithology and for the installation of <br /> on-site and off-site deep groundwater monitoring wells. Pilot soil borings will be <br /> advanced using a truck- or track-mounted drill rig equipped with 8.25-inch hollow-stem <br /> augers. The total depth of each pilot boring may vary according to <br /> geologic/hydrogeologic conditions encountered during drilling. Relative to the property <br /> boundary line, locations of the off-site groundwater monitoring wells are as follows: <br /> • One monitoring well will be advanced approximately 40 feet north of site well <br /> MW-29 on the eastern edge of the site to eva!uate the northern and eastern <br /> extent of the hydrocarbon plume; <br /> • One monitoring well will be advanced approximately 50 feet east of site well MW- <br /> 29 on the eastern edge of the site to evaluate the eastern extent of the <br /> hydrocarbon plume; and -A,� i q1� <br /> • One monitoring well will be advanced approximately 150-160 feet east of site <br /> well MW-29 to evaluate the down-gradient, eastern extent of the hydrocarbon <br /> plume off-site. <br /> The proposed monitoring well locations are illustrated in Figure 2. <br /> 3.5. MONITORING WELL INSTALLATION, DEVELOPMENT AND SURVEY <br /> -0 The proposed pilot soil borings will be single-completed as groundwater monitoring <br /> wells screened at depths of approximately 40 feet to 60 feet bsg. Depths of the <br /> screened intervals may vary or be reduced overall according to hydrogeologic <br /> conditions encountered while drilling. Following installation, each well will be developed <br /> to maximize water flow and minimize the amount of fine-grained sediment drawn into <br /> the well during pumping or bailing. The top of each newly installed well casing (well <br /> head) will be surveyed to determine its elevation relative to North American Vertical <br /> Datum 88. An as built diagram of the proposed construction of the proposed wells has <br /> been included as Figure 3. <br /> Advanced GeoEnviron men ta I Inc. <br />