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r <br /> Ms. Diane Hinson -2- 17 May 1989 <br /> 5. All ground water extracted in the development, purging, and sampling of <br /> these proposed monitoring wells is to be stored in 55 gallon drums for <br /> proper disposal to be determined by laboratory analysis, regardless if <br /> free product is present or not. This water should not be discharged to <br /> the land surface as proposed. Drill cuttings are to be handled in like <br /> fashion. <br /> 6. Ground water and soil samples should be analyzed for ethylbenzene, as <br /> well as benzene, toluene, and xylene which are proposed. <br /> 7. Monitoring well MW-4D is proposed to be installed to a depth of 50 feet <br /> while the other "deep" monitoring wells are to be installed 10 feet into <br /> the "second aquifer" or to a maximum of 50 feet below grade. All the <br /> deep wells proposed in the work plan should be installed at the same <br /> depth and have the same screened interval for lateral correlation. <br /> 8. If the "lower aquifer" is found to be contaminated during the initial <br /> sampling, we suggest that these wells be resampled for confirmation to <br /> ensure that the reported contamination is not an artifact of the <br /> drilling process. <br /> 9. Free product should be removed prior to performing the 24 hour pumping <br /> test in order to eliminate the possibility of drawing free product lower <br /> into the aquifer. This is contrary to the proposal . They propose to <br /> perform the pumping test and then install an interim extraction well and <br /> a free product and extraction system that can also be used to extract <br /> contaminated ground water.. We suggest that they install some type of <br /> free product removal system as soon as possible to remove the product <br /> while the investigative phase of the work is being conducted. Once free <br /> product has been removed, a pumping test could then be performed. <br /> Considering the lack of data at this site, we feel the proposal is premature <br /> in proposing an extraction system. The results of the monitoring well <br /> installations and sampling are to be reported prior to performing additional <br /> work. <br /> I would really like to discuss my comments with you. Give me a call after <br /> you have reviewed it at (916) 361-5725. <br /> EDWARD W. DAME <br /> Engineering Geologist <br /> EW.I:ewj <br />