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550 East Harding Way <br /> Page 2 <br /> Seasonal high depth to groundwater (Spring 1986) was 35 feet and current groundwater in <br /> the area (45 East Harding Way) is approximately 43 feet below ground surface. <br /> PHS/EHD suggests that 2 -3 soil borings be advanced to confirm the analytical results and <br /> to determine the vertical and horizontal extent of the soil contamination using either <br /> conventional drilling equipment or push-point technology. Should the soil contamination <br /> extend to groundwater, two cost effective options exist depending on the drilling <br /> methodology which was selected and the magnitude of soil contamination observed: either <br /> install groundwater monitoring wells or 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 <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 <br /> nutrient concentration (C:N:P ratio) that may aid in environmental fate analysis. <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 /> If I can answer any further questions or provide regulatory input, please do not hesitate to <br /> contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margar Lagorio, RE S <br /> Site Mitigation Unit Lead Senior <br /> MM1550HAR <br /> cc: Elizabeth Thayer, Central Valley Regional Water Quality Control Board <br />