SITE INFORMATION AND CORRESPONDENCE

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• t Mr. Michael Infurna Q February 20, 2001 Page 2 0v0 approximately 2 feet above the screened interval. Approximately 27 feet of pelletized bentonite will be placed over the lower (93 to 110 feet bgs) column of filter sand. A second well casing, screened from about 45 to 65 feet bgs, will be installed above the column of bentonite pellets and chips. The upper screened interval will be packed with sand,as was the lower screen, from 43 to 66 feet bgs. Approximately five feet of bentonite chips will be placed above the upper sand pack. Portland cement grout will be then be placed in the annular space from the top of the bentonite plug to within 3 feet of the surface. Portland cement concrete will be placed within the upper 3 feet of the boring. A cast iron, heavy-duty, 12-inch-diameter Christy box will be installed into the street pavement and completed with Portland cement concrete. The cover will be flush with the pavement. Sierra-Pacific will have a project manager and site safety manager at the drill sites to minimize the risk of traffic accidents and pedestrian interference with work. A traffic control company will be contracted to assure traffic safety. USA will be contacted at least 72 hours prior to initiating the field work. A commercial utility finder will be contracted to search for buried utility structures in the work areas. ■ Nested-Well MW-16 A/B Installation-A nested monitoring well(MW-16 A/B)will be installed in the southbound lane of Myran Avenue, approximately 200 feet south of the intersection of Waterloo Road, Stockton, in the manner specified for well MW-15 A/B above. ■ Nested-Well MW-17 A/B Installation-A nested monitoring well (MW-17 A/B)will be installed in•the southbound lane of Sutro Avenue, approximately 200 feet south of the intersection of Lewis Street, Stockton, in the manner specified for well MW-15 A/B above. ■ Nested-Well MW-18 A/B Installation-A nested monitoring well(MW-18 A/B)will be installed in the southwest corner of the Western Farm Service facility at 1905 North Broadway Avenue, Stockton. Monitoring wells MW-16 A/B,MW-17 A/B,and MW-18 A/B will be installed the same as MW-15 A/B. ■ Pumping Well E-2 Installation-A new pumping well(E-2)will be installed approximately 20 feet south of MW-14 at 1836 North Sutro Avenue,Stockton. The new well will be constructed similarly to pumping well E-1,which was installed at the same Sutro Avenue address in November 2000. E-2 will be screened from 95 to 110 feet bgs. ■ Domestic Well Decommissioning -An old domestic well at 1836 North Sutro Avenue, Stockton will be decommissioned by removing the pump,well casing,and wiring from the well. The old well will be over-bored and grouted to the surface. Sierra-Pacific has no information on the old well. A report of results will be prepared to document the depth and construction of the well, as well as efforts made to decommission it.