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3.0 SUMMARY OF FORMER VFO UST SITE ASSESSMENT ACTIVITIES 3.1 SITE ASSESSMENT ACTIVITIES The assessment of the former UST Site was conducted in accordance with the County-approved Work Plan. A summary of the Site assessment activities conducted is presented below. 3.1.1 Pre-field Activities In advance of conducting the intrusive fieldwork, a number of pre-field activities were 'L performed, including the preparation of a Site Health and Safety Plan (HASP). The HASP was r prepared to safely conduct field-drilling activities. In addition, soil-boring permits were obtained from the County PHS/EHD. Once soil-boring permits were obtained CW&M conducted a subsurface utility evaluation of the proposed boring locations and the former UST excavation a area. The field evaluation for the possible presence of subsurface utilities was conducted on March 10, 2000, by a private locator service company, Subdynamic Locator Services. No r geophysical anomalies were detected in the subsurface in the former UST Site area. Minor adjustments in the locations of the two borings were necessary, based on the presence of stacked fruit boxes. 3.1.2 Drilling Activities Soil borings were advanced using hollow-stem auger techniques. In accordance with the Work Plan, a soil sample drive was advanced at 5-foot intervals starting at 10-feet bgs_ The drilling subcontractor, Spectrum Exploration, utilized a clean, 2.5-inch diameter split spoon sampler that was equipped with clean brass liners. For each 18-inch long sample drive, the split-spoon ' sampler typically recovered three liners of soil. The lowermost soil liner, which was also the least disturbed sample, was retrieved from the sampler and capped at each end with new aluminum foil and clean plastic caps. Each liner submitted to the laboratory was placed in a 1.. clear plastic bag, sealed, marked and placed on ice in a temporary cooler. The lower-most liner was submitted to the laboratory for the required analyses. The middle liner was also submitted 1.,. to the laboratory, but was placed "on hold"to serve as a backup sample, pending receipt of analysis results from the lower-most sample. Following the completion of field activities, the collected soil samples were re-packed on ice into a study cooler and shipped under Chain-of- Custody procedures to the selected laboratory, s l� 1 DF100101 MCPHS.ARSC.062000 5 i�r