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Page 2 FIELD EXCAVATION ACTIVITIES (� The four USTs , associatedproduct lines , sump and hoists were removed on May 20 , 199'3 . Tank removal and sampling was witnessed by William Snavely , an inspector and representative of San Joaquin County Department of Public Health , Environmental Health Division , and Mark Miller representing Chevron U . S . A . Products Company . No holes were observed in the gasoline USTs , lines or waste oil tank . Groundwater was encountered at approximately 8 feet below grade in the UST excavations . SOIL SAMPLING All soil samples were 'collected under the direction of William Snavely . Soil samples were collected in clean six- inch- long brass tubes ( 2 " in diameter ) . Tubes were covered at both ends with aluminum foil and sealed with plastic end caps . The soil samples were then labeled , recorded on a Chain- of - Custody form , put in a cooler with crushed ice and transported to Superior Precision Analytical , Inc . located in San Francisco , California . UST Excavation Sampling Soil samples designated A-W , A- E , B -W , B - E , C -W , and C - E were collected from the fuel UST excavation sidewalls in the native soil near each end of the tanks at approximately 7 feet below grade . Soil samples designated UST -N and UST- S werecollected from the north and south excavation sidewalls also at approximately 7 feet below grade . The approximate sample locations are shown on Figure 2 . An excavator bucket was used to collect a sample from each location . The samples were collected by removing the top 3 " to 6 " of soil in the bucket , then pushing a brass tube into the soil until completely filled , and handled as previously described . Grab samples from the groundwater in the fuel UST excavation were collected in four 40 ml Volatile Organic Analysis ( VOA ) vials ( laboratory supplied with Hcl preservative ) and one 1 liter amber glass bottle . Samples were collected by removing the caps approximately 4 to 6 inches beneath the water surface until bottles were full then tightening the caps . Samples were checked to be sure no headspace was left in the VOAs .