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3 . 0 PROCEDURES <br />' 3 . 1 Excavation <br /> Contaminated soil was excavated from the UST site in two phases <br />' because of space limitations and equipment capabilities. After each <br /> phase of digging, soil samples were collected from the floor and <br /> s.idewalls of the excavation. The first phase of excavation was <br /> performed on August 30 and 31, 1993 . The second phase of excavation <br />' was performed on September 21, 1993 . The excavator and operator <br /> were provided by Ned Pepper, Inc. of Folsom. <br /> Approximately 1., 000 cubic yards of soil were removed from the <br /> former UST site during the first phase of excavating. An additional <br /> 200 cubic yards of soil were removed from the excavation during the <br /> second phase of digging. As the excavation proceeded, the soil was <br />' screened for the presence of organic vapors using a photo- <br /> ionization detector (PTD: Thermo Environmental 580A, 10. 0 eV, <br /> calibrated to isobutylene) and segregated into contaminated and <br /> clean stockpiles. The sample locations are illustrated in Figures <br /> 2 and 3 . <br /> 3 .2 Excavation Soil Sampling and Analysis <br /> Ten (10) soil samples were collected from the sidewalls and floor <br /> of the excavation on August 31, 1993 . After continued excavation, <br />' five (5) additional samples were collected from the si.dewalls and <br /> floor of the excavation on September 21, 1993 . All samples were <br /> collected under the direction of Ms. Mary Meays of the PHS/EHD. <br /> The soil samples were collected from the excavator bucket using a <br /> metric soil sampler loaded with two clean 2-inch by 3-inch brass <br /> tubes. The ends of the lead tubes were covered with aluminum <br /> sheets, capped and sealed with tape. The samples were placed in a <br /> chilled container, transported under chain-of-custody to Sparger <br /> Technologies, Inc. (STI) and analyzed for total petroleum <br />' hydrocarbons (TPH as gasoline) and volatile aromatics (BTE&X) in <br /> accordance with EPA methods 8015m and 8020, respectively. <br /> 3 . 3 Stockpile Soil Sampling <br /> Soil from the "clean" soil piles was sampled on October 6, 1993 . <br /> The samples were collected using a metric soil sampler pre-loaded <br />' with clean brass tubes using the same protocol as the excavation <br /> soil samples. The samples were collected under the direction of Ms. <br /> Meays of the PHS/EHD. <br />' 3.4 Monitoring Well Purge Procedures <br /> On October 14, 1993 , personnel from GeoAudit attempted to purge <br /> standing water from the wells using a submersible pump. However, <br /> because of heavy equipment operation at the site, the wells <br /> 5 <br />