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11 15 November 2005 . AGE-NC Project No 95-0130 Page 7 of 10 3 1 PERMITTING AND PRE-FIELD WORK ACTIVITIES A site assessment boring permit will be obtained from the EHD for all off-site CPT boring locations and encroachment permits will be obtained from the City of Stockton Public Work Department 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, each boring location area will be clearly marked and a utility clearance obtained through Underground Service Alert 3 2 CPT DRILLING AND SAMPLE COLLECTION Utilizing a 25-ton truck-mounted CPT drill rig equipped with 11/4-inch diameter hollow-stem rods, AGE proposes to advance three CPT soil borings to help define the lateral extent of petroleum- impacted ground water(i e MTBE) AGE proposes to advance each CPT soil borings to depths of approximately 125 feet below surface grade(bsg)to fully assess contaminant impact to shallow and deeper zone ground water The soil borings will be advanced at the following locations (Figure 2) • CPT boring no 4 (CPT-4)will be located on the east side of Wilson Way in the northbound lane, approximately 60-70 feet southeast of Top Filling Station well MW-3 • CPT boring no 5 (CPT-5)will be located on the east side of Wilson Way in the northbound lane, approximately 70-80 feet southeast of Top Filling Station well MW-6 • CPT boring no 6 (CPT-6) will be located on the east side of South Wilson Way in the northbound lane, approximately 60-70 feet east-southeast of MW-4 A section of the northbound lane of South Wilson Way will be closed during all drilling activities, efforts will be made to minimize the impacts on local traffic and to ensure work-site safety Each of the proposed CPT locations will consist of multiple 13/4-inch boreholes The first CPT boring at each location will be utilized for cone penetrometer testing, the CPT will acquire a continuous lithologic record to interpret the stratigraphic and hydrogeologic units Based on interpreted lithologic data and assessment needs, additional 13/4-inch soil borings will be advanced adjacent to the first CPT boring (less than 2 feet) to acquire independent grab ground water samples in each targeted zone Each CPT boring will be advanced to total depths of approximately 125 feet bsg, however, the total depths of borings may vary according to hydrogeologic conditions encountered during drilling activities Additional CPT literature is included in Appendix A Advanced GeoEnvironmental,Inc