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s <br />-x s� - ..r x .�; .h..� � ,-. - -, c ,.,cam_ .3�x:�� :.�';. `. `-' ��„iE�. 'v._ 5 N "e w'• � � ��-h. _ i <br /> ). H. KLEINFELDER&ASSOCIATES <br /> 6 REGOFBfS MATIONS <br /> 6.1 SOIL <br /> The soil type and moderately low permeability soils indicate currently <br /> available in-situ remedial treatment methods may not be successful. <br /> Bench-scale laboratory tests and a small-scale pilot system would be <br /> FEW <br /> required to fully evaluate the feasibility of such alternatives. <br /> Evaluation of more conventional remedial alternatives therefore appears to <br /> be the most cost-effective action at this time. <br /> Kleinfelder recommends removal of soil down to approximately 16 feet from <br /> i <br /> land surface and evaluation of on-site treatment options for the excavated <br /> soil such as aeration and/or microbiological treatment. The 16-Foot <br /> excavation would remove the highest percentage of the hydrocarbons from <br /> the vadose zone and would be an economical and coat-effective action. <br /> w. Excavated soil would be stockpiled on plastic and covered for temporary. <br /> storage until comparative evaluations and detailed analysis of treatment <br /> options are completed, designed, and approved for implementation by the <br /> „^ <br /> regulatory .•agencies. The immediate removal and temporary storage action . <br /> is recommended in order to: <br /> o Minimize further migration of hydrocarbons to underlying ground <br /> r�1 water <br /> o Promote the degradation of hydrocarbons during the temporary <br /> -- storage period <br /> 7. <br /> a Allow Teichert to resume normal operations in the area. <br /> It is our opinion that removal of soils below 16 feet is not cost- <br /> _---.__- _effective..._ _The..__tap1bfeet_of_.soil accounts for 1,252 gallons or 75% of <br /> 38-87--43 18 <br />