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I� If flowing is severe, then duplicate advances of individual borehole locations may be required to collect the desired samples at the location, which could sisgruf cantiv increase drilling time and costs in sampling and borehole sealing The boreholes will be drilled with truck mounted hollow stem auger and/or direct push drilling equipment All drilling equipment and sampling tools will be cleaned prior to arriving, between driving samples and before leaving the site The augers of push rods will be advanced to the desired sampling depth interval, and a drive split spoon sampler will be driven ahead of the drill bit The sampler will then be retrieved and dissembled, and the soil filled brass or acetate liners retained for chemical analysis will be sealed with Teflon® paper and plastic end caps, labeled, logged onto chain-of-custody forms and place in a chilled ice chest on crushed ice Drill cuttings will be drummed and left on-site The boreholes will be logged using the Unified Soil Classification System under the supervision of a registered geologist Additional litholoaic information may be collected to describe the subsurface geology Soil samples will be reconnaissance field screened for presence of contaminants by checking for presence of odor and staining, and use a photo ionization meter for soil field vapor measurement use Soil samples will be collected at minimum five-foot intervals, with additional samples collected at intervals of obvious contamination and at stratigraphic features of interest using field discretion Upon completion of the borehole drilling and collection of information, all boreholes will be backfilled with cement grout placed from the bottom to top of the borehole by tremae line Reconnaissance Groundwater Sampling ill boreholes will be sampled using push or drill rods or hollow stem auger as temporary casing Depth to groundwater measurements will be made to the nearest orae-one hundredth of one foot from existing grade and also checked for the presence of separate please product The groundwater sample will be carefully collected with a clean disposable bailer and poured into the appropriate laboratory prepared container with minimum cavitations and headspace Each water sample will be labeled, logged onto a chain-of- custody form, and placed in a chilled ice chest on crushed ice Geophysical Survey-Potential Contaminant Sources A surface geophysical survey using ;round-penetrating radar will be used to search for subsurface anomalies, which could be potential contaminant sources Wright feels that this is the most efficient method to search for possible source given the buildings and pavements present, which covers most of the property The survey will cover an area of about one-quarter acre in area, which include the former tank pit area, the welding building and the area of MT W-9 and immediate vicinity i Page 2