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15 February 2005 <br /> AGE-NC Project No. 02-0950 <br /> Page 3 of 7 <br /> • Preparation of a report of findings. <br /> Each of these tasks is described in greater detail below. <br /> 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> A site assessment boring permit will be obtained from the EHD for all on-site and off-site boring <br /> locations. Encroachment permits will be obtained from the City of Stockton Public Work <br /> Department and property access agreements from off-site private property owners. In addition, a <br /> health and safety plan will be updated in accordance with Occupational Safety and Health Guidance <br /> Manual for Hazardous Waste Site Activities(National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to <br /> mobilization,the area of excavation will be clearly.marked and a utility clearance obtained through <br /> Underground Service Alert. <br /> 3.2. CONE PENETROMETER TEST(CPT) <br /> AGE proposes to advance one paired CPT soil boring at the site(Figure 2)as part of site assessment <br /> activities to characterize lithology,identify potential contaminant-migration pathways and to assess <br /> the vertical extent of petroleum hydrocarbon-impacted ground water. <br /> 3.2.1. CPT Boring Location <br /> The proposed boring location will be immediately east of the former UST location,between borings <br /> B2 and B4,to further delineate vertical ground water contamination directly at the source area. The <br /> CPT borings shall be advanced to approximately 100 feet below surface grade(bsg)utilizing a 25- <br /> ton truck-mounted CPT drill rig equipped with 2-inch diameter hollow-stem rods; however, total <br /> depth of the boring may vary according to geologic conditions and field evidence of impacted media <br /> encountered during boring advancement. <br /> 3.2.2 CPT Ground Water Sample Collection and Analysis <br /> Grab ground water samples will be collected in selected intervals of saturated porous and permeable <br /> soil.Except for depth intervals screened by the current monitoring well network,sampling intervals <br /> will be selected based on interpretation of lithologic data from the initial CPT boring with an <br /> objective of sampling significant hydrogeologic units. Ground water sampling procedures are <br /> Advanced GeoEnvironmental,Inc. <br />