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GRANITE CONSTRUCTION—FRENCH CAMP Page 3 WKA No 2088.09 March 12, 2003 analysis on November 30, 2001 The groundwater flow direction continues to be toward the northwest with a hydraulic gradient of approximately 0 002 feet/foot From March 1993 to December 1998, groundwater samples have been obtained from the wells on a consistent basis Depth to groundwater beneath the site has fluctuated from 3130 feet in October 7, 1994 to 15 25 feet bsg in December 17, 1998 Groundwater flow direction historically has been to the northwest with hydraulic gradients ranging from 0.001 feet/foot to 0 004 feet/foot TPH as gasoline, and BTEX have not been detected in wells MW4, MW5, MW6,MW7, or MWS since May 11, 1995 Based on historical data and results of the December 30, 2001 groundwater monitoring and sampling event we believe the site should be classified as a"low risk groundwater case" as defined by the CVRWQCB and considered for closure We recommend that the CVRWQCB be notified of our findings Upon concurrence for site closure by the SJCPHS and the CVRWQCB, we recommend that the eight groundwater monitoring wells and the dust control well be • abandoned in accordance with County and State regulations Well Abandonment Workplan The purpose of our work will be to properly abandon eight 2-ranch diameter groundwater monitoring wells and the dust control well all of which are located onsite at the Granite Construction facility. Our scope of work will include the following Preparing a brief workplan and obtaining well destruction permits from San Joaquin County Public Health Services (SJCPHS) * Coordinating all work with the site facility manager to assure proper site access Pressure grouting the wells with a cement grout slurry to surface grade using a drill ng equipped with a tremmse system 00 WALLACE KUHL Hecy&dNNp fir ASSOCIATES INC