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CLEARWATER <br /> G R O U2, I N C <br /> 6.0 RECOMMENDATIONS <br /> Results of analysis of groundwater samples collected during this phase of activity are <br /> I generally consistent with those of previous sampling events, with the exception of <br /> the low concentrations of ethylbenzene, toluene and xylene isomers detected in the <br /> sample collected from MW-4 The source of these volatile compounds has not been <br /> determined Concentrations are below State action levels It is recommended that <br /> quarterly sampling continue without program modification in order to verify the <br /> occurrence of these compounds <br /> The soil vapor extraction system will continue to run Operation and maintenance <br /> visits to the site will be made weekly Air samples will be taken periodically to <br /> maintain compliance with the SJVUAPCD air emissions limits and monitor system <br /> effectiveness It is recommended that a respiration test be completed following the <br /> completion of the next full quarter of system operation. The respiration test will <br /> measure the rate of microbial degredation, and enable an estimation of the duration <br /> of site cleanup activity A letter detailing respiration test protocol will be forwarded <br /> to the PHS/EHD prior to test completion It is anticipated that the test results will be <br /> incorporated into the next quarterly report <br /> 1 <br /> 1 <br /> D-102 IQ95 5 May 14, 1995 <br /> 1 <br />