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Extender!Site Characterization Report: 7500 West Eleventh Street, Tracy, CA. Page ]5 Well Total Screened Purpose No. Depth Interval j MW-5 22 ft. 7 to 22 ft. Investigate western lateral extent of affected groundwater. MW- 6 22 ft. 7 to 22 ft. Investigate groundwater quality to the north of the principal release of fuel hydrocarbons. E= t MW- 7 22 ft. 7 to 22 ft. Investigate groundwater down-gradient from �.::. the principal release of fuel hydrocarbons. MW-8 22 ft. 7 to 22 ft. Investigate eastern lateral extent of affected plume of groundwater. MW-9 22 ft. 7 to 22 ft. Investigate groundwater quality to the east of the plume of affected groundwater. MW-10 22 ft. 7 to 22 ft. Investigate groundwater quality at distance down gradient from where the principal release of fuel hydrocarbons occurred. - MW-11 32 ft. 7 to 22 ft. Investigate groundwater quality near `= northern, down gradient limit of plume of affected groundwater. s: MW-12 22 ft. 7 to 21 ft. Investigate groundwater quality in area that was the apparent site of a secondary release of fuel hydrocarbons to the subsurface. MW-12A 36 ft 30 to 35 ft. Investigate vertical extent of affected groundwater in area that was the apparent site of a secondary release of fuel hydrocarbons to the subsurface. f Note: As is necessary to perform the hydrogeological computations that are an essential part of a site characterization program for a site where groundwater has been affected by a release of fuel hydrocarbons or other chemicals of concern, SJC used standard engineering methods to find the surface elevations at, and the casing elevation of, each monitoring well by reference to a local benchmark established by San Joaquin County to an accuracy of plus or minus 0.01 ft. For the purpose of completing the required well-completion reports to the DWR, SJC used ` a Graphical Position System (GPS) receiver capable of resolving the SJC