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Appendix <br /> Field Procedures <br /> This appendix presents the methods and procedures that were used to collect,manage,and analyze <br /> soil and groundwater samples and conduct measurements in the field. Included in this section are <br /> methods for: <br /> ■ Soil borings <br /> _ ■ Soil sample collection <br /> ■ Groundwater sample collection <br /> ■ Water level measurements <br /> ■ Sample identification <br /> ■ Sample container labeling,sample preservation,shipping and chain-of-custody <br /> ■ Documentation <br /> ■ Contaminated materials disposal <br /> ■ Equipment decontamination <br /> .1 Plume Delineation Sampling <br /> A total of 7 borings were drilled by HEW Drilling Company,CD 's subcontractor,utilizing hollow <br /> stem auger drilling techniques. Sample collection consisted of soil cores(collected at 5-foot intervals <br /> AOL below the water table)and groundwater samples collected using the Hydropunch@ method. <br /> Groundwater samples were obtained for a variety of depths(see Table 2-1). The following <br /> subsections describe the sampling approach used. <br /> B.1.1 Sampling Approach <br /> Sample collection was carried out as described below: <br /> -- ■ Each boring was advanced without sample collection to the depth of 10 feet above <br /> the groundwater table,as measured in the field at monitoring wells MW-13 and <br /> MW-14 prior to drilling(60 to 75 feet below the ground surface). Sampling <br /> information above the targeted depth is not necessary because of the abundant data <br /> available in the unsaturated zone from previous investigations. General lithology <br /> was logged from soil cuttings in the unsaturated zone. <br /> ■ In the initial boring of each transect(ARL-XA,where X is a transect number),discrete <br /> groundwater samples for shallow and deep aquifer units utilizing the Hydropunch® <br /> water sampler were taken as described below. <br /> ■ Also in the initial boring,continuous soil samples were collected for lithologic <br /> logging and possible laboratory analyses using a 5-foot long,split-barrel,core <br /> sampler as described in Section 2.2.1.3. Laboratory analyses include grain size <br /> distribution and total organic carbon content. All collected soil samples were <br /> retained for future use. <br /> CDM Camp Dresser&McKee CS 010808 B-1 <br /> W:wEPORTMTMKTOtMR PIUME.W"PX®.WPD City of Stockton 190855.0006 <br />