Laserfiche WebLink
method 8020, and for gasoline oxygenates using EPA method 8260. The results are shown in Table <br /> 2. <br /> Samples from KF-1, KF-4, KF-6, and KF-7 continue to be below reporting limits for all analytes. <br /> MTBE continues to be detected in KF-2 at low concentrations (0.85 ppb), but this well is otherwise <br /> free of hydrocarbons. <br /> In the first quarter of 2002, the TPH-g concentration in KF-3 was 280 ppb and the concentration in <br /> KF-5 was 190 ppb. The concentration rose in both wells during the second quarter, when the <br /> remediation system at the Chevron site was inoperative, but the concentrations began to decline <br /> when the system was restarted later in the year. By the end of 2002, the concentration had reached <br /> 440 ppb in KF-3 and 280 ppb in KF-3. Apparently this decline has continued, and the laboratory <br /> reported concentrations of 230 ppb and 190 ppb in February. Benzene followed the same pattern as <br /> TPH-g, and other volatile aromatics may have as well. MTBE followed the same pattern in KF-5, <br /> but exhibited the opposite trend in KF-3, rising continuously throughout 2002 and reaching 260 ppb <br /> in February 2003. Two other oxygenates (TBA and TAME)have remained constant in KF-3 during <br /> that time. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Hydrocarbon concentrations remain below detection limits in four of the seven wells at the Kwikee <br /> Foods site, and concentrations (except for MTBE in KF-3) continue to decline in the other three. <br /> . Because these trends have now persisted for several quarters, with only occasional (and explicable) <br /> interruptions, it should now be apparent to all observers that remediation is taking place beneath the <br /> site. <br /> We recommend complying with EHD's February 2003 request to continue groundwater monitoring <br /> through the second quarter of 2003, at which time SECOR, Inc. proposes to submit a Site <br /> Conceptual Model report for the Chevron and Kwikee Fvods sites. All wells will be monitored in <br /> the second quarter, but only KF-1,KF-2, KF-3, and KF-5 will be sampled. <br /> 4 <br />