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�-i CJeofod ical Technics Inc. <br /> 2741 River Road <br /> Mode o,Ca&fo is 95351 <br /> (209)538-6424IFax#538-5852 <br /> Addendum to Work Plan For <br /> Additional Site Characterization <br /> {, C & B Equipment <br /> tJ 7474 West 11th Street <br /> Tracy, California <br /> Project No. 336.2 <br /> r April 7, 1997 <br /> E.! <br /> 1.0 ADDITIONAL SITE CHARACTERIZATION <br /> On behalf of C & B Equipment, Geological Technics Inc. responds to the San Joaquin <br /> County Public Health Service June 4, 1996 correspondence and subsequent conversations <br /> with Mr. Ron Rowe directing that a work plan to further investigate the extent of <br /> contamination. It is the intention of this Work Plan Addendum to propose techniques and <br /> methodology that will offer site specific data in order to better qualify the risk at this site. <br /> To further investigate the extent of gasoline range petroleum hydrocarbons in the <br /> groundwater, Geological Technics Inc. proposes to: <br /> j • Drill 5 soil borings, to be completed as monitoring wells, and collect soil samples from <br /> each. <br /> • Test selected soil samples for geotechnical parameters to evaluate fate and transport <br /> considerations. <br /> • Install four shallow groundwater monitoring wells screened across the water table in the <br /> C down gradient and cross gradient directions. <br /> • Install one deeper screened groundwater monitoring well in an effort to complete vertical <br /> C extent of groundwater contamination. <br /> • Continue routine groundwater monitoring that will include measuring additional <br /> parameters to evaluate the plume stability. <br /> • Perform a receptor survey to include identifying all wells in a 1000 ft radius and <br /> evaluating their construction, use,and pumping history. <br /> The results of the investigation to date are summarized in this document (Summary Tables- <br /> Appendix A). All of the data will be integrated and reported together once this proposed <br /> C scope of work has been completed. <br /> e <br /> Li <br />