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r <br /> Ms. Mary Meays <br /> Site Code 1354 <br /> September 22, 1992 <br /> Page 2 <br /> 5. Concentrations of dissolved phase fuel hydrocarbons in groundwater underlying the source <br /> area are currently below.drinking water standards: SEACOR believes that dissolved phase <br /> concentrations downgradient of the source area would tend to be lower than those measured <br /> -at the source due to the physicochemical processes of.adsorption, dispersion, volatilization, <br /> and biodegradation during transport. <br /> 6. A soil vapor extraction system has been operating at the site since April 1992:' Operating.; <br /> data indicate that the system is effectively removing adsorbed phase gasoline from the source <br /> area; thereby eliminating or significantly reducing potential for further groundwater <br /> degradation. <br /> Based on the rationale and site-specific conditionsstated above, we believe that adequate evidence <br /> exists indicating that groundwater quality has not.been significantly impacted and respectively request <br /> -you reconsider the'requirement for additional monitoring wells. <br /> i <br /> Your-September 15, 1992 letter.also requests,that.the existing.monitoring well be sampled on a <br /> .'quarterly.basis, with the next sampling event to be scheduled_ no later than September 25, 1992. <br /> Since installing the existing monitoring well in May 1991, 'SEACOR has. ,performed quarterly <br /> .groundwater monitoring and reporting. The current.monitoring schedule includes sampling during <br /> the months of February, May, August, and November., SEACOR completed the most recent <br /> quarterly sampling event in August 1992 and the results were included in a quarterly status report <br /> dated September 3, 1992. We.apologize for not providing advance notice of this sampling event. <br /> I For.future sampling events,SEACOR will provide a minimum'of 48 hour advance notice. The next <br /> quarterly sampling event.is scheduled for November 1992. <br /> E , <br /> If you-need.further.-inform ation and/or clarification regarding,our.request, both SEACOR and Mr. <br /> Kidd would be happy to meet with you and your supervisor to discuss this matter further. I will be <br /> IE in-contact with-you. n'the pear:.future to schedule a-'-pnee.ing,,ifynecessary.; <br /> Sincerely yours, <br /> Science & Engineering Analysis Corporation <br /> I <br /> Bruce E. ScarbrouJR.G. #4931 <br /> Project Manager <br /> cc: Mr. Mardee Kidd <br /> I <br />