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1701 West Washington <br /> Page 2 <br /> i <br /> PHS/EHD suggests that 2 - 3 soil borings be advan ed to determine the vertical and <br /> horizontal extent of the soil contamination using either conventional drilling equipment or <br /> push-point technology. Should the soil contaminate n extend to groundwater, two cost <br /> effective options exist depending on the drilling me hodology which was selected and the <br /> magnitude of soil contamination observed: either install groundwater monitoring wells or <br /> collect groundwater grab samples. <br /> If soil contamination has not been defined within the estimated scope of work, as time <br /> allows within the budget, additional soil borings should be drilled within the same phase of <br /> work. If soil contamination can be defined and appears to be limited, PHS/EHD suggests in j <br /> addition to chemical analysis, the analysis of parameters which may include: organic <br /> carbon content, soil aeration, soil moisture content soil pH, microbial population, and soil I <br /> nutrient concentration (C:N:P ratio) that may aid in environmental fate analysis. j <br /> Once the extent of soil contamination has been determined remedial alternatives should be <br /> evaluated. Should groundwater contamination be evidenced, it will be necessary to <br /> perform a groundwater investigation. <br /> I <br /> If I can answer any further questions or provide regulatory input, please do not hesitate to <br /> contact me at (209) 458-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> IfA <br /> Mary Meays, Senior REHS Margaret Lagorio, EHS <br /> Site Mitigation Unit Lad Senior <br /> MM/1701 .WAS <br /> cc: Elizabeth Thayer, Central Valley Regional W ter Quality Control Board <br /> i <br />