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V Geologic a(T"AdcsInc. Page 6 Dual Phase Extraction Pilot Test Work Plan Valentine(Castle Motors) Project No. 764.2 September 8,2003 �. The detection limits,for these compounds are listed below. -A ,Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. . Detection emits: 13TEX MTBE TPH- Water gg/L) 0. L3,0 DATA ANALYSIS The data analysis will allow for the determination of the proper construction of a vapor L extraction system and groundwater treatment system for full remediation(if necessary). 3.1 Soil Vapor'Extraction GTIshall calculate the radius of influence by measuring vacuum pressure from the extraction well and rate of vacuum pressure drawdown in the new vapor extraction-wells r VEW-1 & VEW-2. The pressure necessary for demonstrating vacuum influence is �i generally regarded.as at least 0.1 inches of water ("How to Evaluate Alternative Cleanup Technologies for Underground Storage Wank Sites", USEPA, May, 1995). 3:2 Groundwater Extraction The data will be analyzed by constructing time-drawdown graphs. The variables used in the common aquifer testing fonnula can be obtained from the graphs. The exact equations that will be used and hence the corresponding graphs are not known at this time because it is unknown if the aquifer test will reach steady state conditions. However,a "Discussion of Applicable Equations" is included in Appendix D. In the event that a cone of depression with a large radius develops during the aquifer test, the data will also be analyzed by distance-drawdown methods. To use distance-drawdown . accurately, the cone of depression must reach at least three observation wells that are located at three different distances from the extraction well. The data that will be collected after the aquifer test has concluded will be analyzed by the appropriate aquifer equations for the type of aquifer determined to characterize this interval. The test results and calculations will be presented in a report that will subsequently be used to prepare a final remedial design plan (if necessary). This plan will propose the extraction system for the capture zone and the source extraction area. r 4.0 SCHEDULE&REPORTING �•t Upon work .plan approval and cost pre-approval from the Fund, we will immediately L proceed with scheduling this project. The information gathered during this phase of work will be presented in a report, which will include a summary of the extraction data and recommendations. Dr. Ray Kablanow, a registered professional geologist, will supervise the project. Copies of the.report will be forwarded to the appropriate County and State regulatory agencies (SJC PHS/EHD and CRWQCB). L