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Attachment A AT&T Corp. - CVRWQCB Access Agreement 2201 W.Yosemite Avenue,Manteca,California Scope of Work The State of California Central Valley Regional Water Quality Control Board(CVRWQCB)is conducting investigation and cleanup of a petroleum release from an underground storage tank at the Franks One Stop site located at 2072 W.Yosemite Ave.,Manteca,California,under the California Emergency,Abandoned,and Recalcitrant(EAR)Account Program. AT&T Corp.owns the property with a common street address of 2201 W.Yosemite Avenue,Manteca,California,Tax Assessor Parcel Number(APN) 198-170-29. The AT&T Corp.property at 2201 W.Yosemite Avenue may have been impacted by the petroleum release from the Franks One Stop site. The CVRWQCB seeks access to the AT&T Corp.property for the CVRWQCB, its employees,agents,and contractors to investigate the nature and extent of the contamination from the Franks One Stop release which may be present on the property at 2201 W.Yosemite Avenue. The CVRWQCB intends to install and sample initially and periodically thereafter two clusters of three groundwater monitoring wells along the east property line of the northern portion of the AT&T Corp.property in the general area depicted on the Site Plan which accompanies this Scope of Work. The proposed well locations are being finalized by the CVRWQCB. To install the groundwater monitoring wells,the CVRWQCB,its employees,agents,and contractors plan to use a drill rig mounted on a single axle truck. The drilling company will have a support truck to carry the well supplies and a tractor to remove the soil boring cuttings(soil)to be stored at an off-site location. Prior to drilling a new monitoring well, the CVRWQCB, its employees,agents,and/or contractors will mark the site in white paint and call USA/DigAlert as required by law and then use a private underground utility locating service to clear all drilling locations. In addition,at a minimum,the first 5-feet of the borehole is advanced by hand auger to physically clear the drilling location. The three wells at each cluster will be drilled to depths of 20-feet,55-feet and 105-feet,representing the three water bearing zones needed to monitor for possible contamination. The wells will be constructed of 2-inch PVC pipe and completed in an above grade steel"Stove pipe"locking cover(8-inch diameter about 2.5—3.0 feet high. The wells will be approximately 5-8 feet apart in each cluster. The soils from the borehole will be removed continuously during the drilling process and contained in a roll top lockable steel roll on bin located off the AT&T Corp.site. The initial effort for installation and first round sampling of the wells will take a total of approximately seven days. Four days are expected to drill and install the wells. Two or three days after installation,the wells can be developed. Two or three days after well development,the wells can be surveyed and sampled which should take one day. Thereafter,the wells will be monitored and sampled once a quarter. The current schedule is for the sampling to be completed in the second month of the quarter;February, May,August,and November. Each sampling event should take a maximum of two to three hours. The purgewater from the wells will be contained on the sampling truck and removed from the site that day. Periodic sampling is expected for a period of two years. Assuming site closure can be achieved,at the end of periodic sampling the groundwater monitoring wells on the AT&T Corp.property will be closed and properly decommissioned in accordance with the State of California guidelines and the San Joaquin County Environmental Health Department,which is the permitting authority for the well destruction.