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' Sutter Office Center Project 2267-E <br /> July 10, 2000 Page 6 <br /> I <br /> In our opinion,the presence of residual petroleum at this site does not present a potentjal, <br />' hazard to the groundwater at this site because of the following factors <br />' 1 The underground tanks and pumps have been removed from this area more than <br /> 20 years ago <br />' 2 The residual contamination appears to be retained by the low permeability, <br /> clayey soil, and there are no apparent conduits for its offsite migration <br /> 10 3 The site is asphalt covered and used as a parking lot This prevents the inflow of <br /> rainwater that would contribute to the downward movement of the contaminants into the <br /> groundwater. <br /> 1 <br /> 4 The shallow groundwater under this site is saline and non-potable, and appears <br />' to be confined below the clayey soil at a depth of approximately 40 feet <br />' CLOSURE <br />' We have enjoyed working with you on this project If you have any questions, please do <br /> not hesitate to call our office The following plates and appendices are attached and <br /> complete this report <br />' Plates• <br />' 1. Piot Plan <br /> 2-A through 2-G Probe Logs <br /> 3. Summary of Soil & Groundwater Analysis <br /> 1 <br /> HYDRO GEO CONSULTANTS,INC <br />