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Preliminary Endangerment Assessment Page 11 <br /> Former Haley's Flying Service <br /> GPE Project 474.2 <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 6.1 Conclusions <br /> The conclusions contained in the original PEA remain in effect except as follows: <br /> 1. Toxaphene, Endrin, and Endosulfan were detected in groundwater samples and are <br /> identified as chemicals of potential concern. <br /> 2. Additional work will be needed to define the direction of groundwater flow and the <br /> lateral and vertical extent of groundwater contamination. <br /> 6.2 Recommendations <br /> The recommendations contained in the original PEA remain in effect. We also recommend <br /> that groundwater monitoring wells be drilled and constructed to help characterize the extent <br /> of groundwater contamination. <br /> 6.3 Preliminary Scoping Recommendation <br /> The scoping recommendation contained in the original PEA stands, but the Remedial <br /> Investigation / Feasibility Study (RI/FS) process should include construction of groundwater <br /> monitoring wells to further characterize the extent of groundwater contamination. <br /> 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto,Ca 95356 Fax: (209)569-0295 <br />