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Mr. Marshall Cloud <br /> March 6, 2003 <br /> Page 2 <br /> times will be extended, there is a greater risk of contaminant migration, and mass <br /> removal efficiency will continue to decrease thereby requiring additional funds to <br /> be allocated to correct the deficient extraction/remediation system. <br /> 3.) After the report was received by DTSC, DTSC's project manager attended and <br /> participated in the Remedial Project Manager's meeting on February 12, 2003. <br /> From that meeting it appears that most of the above-mentioned issues in addition <br /> to the treatment-system communication problems have been rectified. Although <br /> the regulatory agencies were told the problems have been fixed, they were never <br /> told what caused the treatment system communication problems to begin with. <br /> Specifically, please indicate in the report what caused the communication problem, <br /> and what assurances can DDJC provide the regulatory agencies with to ensure <br /> that these issues do not manifest themselves again in the future. <br /> Specific Comments <br /> 1.) Page 5-1, section 5.1.4, last sentence: This section states that Extraction Wells <br /> "(EW002AU) and EW005AUA are also equipped with liquid-phase granular <br /> activated carbon (GAC) at the wellhead to control pesticide concentrations, <br /> although these GAC systems are not in operation." Please identify in the report <br /> why the wellhead treatment is not currently in use, and when it will be fully <br /> implemented on the wells. <br /> 2.) Page 5-1, section 5.1.6, third sentence: Due to EW043AU's low yield it will not be <br /> used as part of the pesticide extraction system according to the report. Please <br /> indicate in the report whether the well will be properly abandoned and destroyed if <br /> not planning to be used in the pesticide design. If not, please indicate in the report <br /> if the well will be used as an additional groundwater extraction well for Volatile <br /> Organic Compounds. <br /> 3.) Page 5-2, section 5.1.7, third sentence: Please refer to specific comment#1 for <br /> EW021A and EW022A. <br /> 4.) Page 5-2, section 5.2.1.3, fifth sentence: Please rephrase this sentence in the <br /> report to "Due to communication problems with the treatment system, the design <br /> flow rates are either unknown or estimated." <br /> 5.) Page 5-3, section 5.2.1.4, fourth sentence: In the final version of the report, please <br /> update the sentence(s) in the report to reflect the current status of the treatment <br /> systems at that time. <br />