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Workplan for Soil Excavation J B Terminal/Blincoe Trucking 6700 Grantlme Road, Tracy, CA Protect No W0322 01 Page 2 and October 15, 1992 petroleum hydrocarbon analytes were detected in wells MW2 and MW4, respectively ) Water elevation data is summarized on Table 3 Based upon the fact that petroleum hydrocarbon contamination left in place is impacting the groundwater during the irrigation season RESNA Industries, on behalf of our client, recommends the removal of the impacted soil SCOPE OF WORK The following scope of work is based upon the information outlined above The work is designed to remove impacted soil in the vicinity of the former tank and product lines (Figure 2) All field work will be performed under the supervision of RESNA personnel in accordance with the Site Safety Plan (Attachment 1) Soil Excavation and Sampling . To prevent residual petroleum hydrocarbon contaminants in the soil from acting as a source of degradation to the groundwater, the soil in the vicinity of the former storage tank and product lines will be excavated Depth to groundwater is approximately 12 feet below grade at this time of year therefore the anticipated total depth of excavation will be less than 12 feet A backhoe capable of excavating to 15 feet below grade will be used for excavation it is estimated that 150-200 cubic yards of soil will be excavated If possible, clean overburden will be separated from contaminated soil prior to stockpiling on site Excavated soil will be underlain and covered with plastic sheeting A Photoionization Detector (PID) will be used during excavation to assist in evaluating the lateral extent of soil impaction Backfilling of the tank pit will be accomplished using pea gravel to within five feet of the surface, engineered fill in one foot lifts to 2 feet below grade and road base with asphalt capping to grade Following excavation four confirmation sidewall samples will be collected from the excavation The exact number and locations of the samples will be determined in the field under direction of San Joaquin County Environmental Health Division All verification soil samples will be collected from the backhoe bucket at least three inches below the surface of the soil The samples will be collected in prewashed brass liners Each liner will be sealed with a Teflon sheet and plastic caps, sealed in air-tight bags, and preserved on ice pending shipment to RESNA Environmental Laboratory, certificate ##1211 Soil samples will be transported under chain-of-custody to the laboratory for analysis for • benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline WP-0293 U