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' FIRESTONE Service Center 400 North El Dorado Street, Stockton, Cahforma <br /> October 6, 1993 Site Assessment Work Plan--2072.01 Page 7 of 7 <br /> 4.8 Boring Abandonment <br /> Soil borings will be sealed by grouting with a mixture of Portland cement and sodium <br /> bentonite to near-ground surface An erosion-resistant concrete cap, measuring at least <br /> four times the diameter of the boring in all dimensions, will be emplaced above the <br />' cement/bentonite grout. <br /> Drill cuttings will be stockpiled separately on, and covered with, 6-mil plastic sheeting <br /> at the site Analyses of soil boring samples will serve to characterize this material <br /> Disposal options and procedures will be based upon the analyses performed <br /> 5.0 SITE ASSESSMENT REPORT PREPARATION <br /> Ryan-Murphy's geological and engineering staff will interpret field information and laboratory <br /> analyses and will prepare a report that complies with format and content requirements of the <br /> Central Valley Regional Water Quality Control Board <br /> Information compiled from this subsurface investigation will be used to develop <br /> recommendations and strategies regarding the need for, and content of, remedial activity at this <br /> site <br /> 6.0 WORK PLAN REVIEW <br /> The work plan described herein has been reviewed by the undersigned professional geologist <br /> registered in California Based on currently available data concerning the site, this "Site <br /> Assessment Wo Plan" co ms to standard accepted groundwater and engineering geologic <br />' practices in in Cal at s time <br /> I <br />' Wm. Curtis Wells, CPG <br /> Consulting Groundwater & Engineering Geologist <br /> CA Registration #1338 <br /> W C Wells & Co Inc <br /> 2010 West 120th Avenue <br /> Denver, CO 80234 <br />' 3031466-3801 <br /> RYAN-MURPHY, INCORPORATED Denver <br />' Fnvr< =wvdw Con arudion Management Los Angeles <br />