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State of California • • Department of Health Services <br /> I <br /> M e m o r a n d u <br /> r <br /> Jim Pinasco August 8, 1988 <br /> To Waste Management Engineer Date : <br /> Subject: DEFENSE DEPOT, <br /> TRACY <br /> eg <br /> From Reid Buell, R.G. <br /> Associate Engineering Geologist <br /> In your request to the technical support group dated 28 July 1988, <br /> you asked for an opinion on proposed monitoring well locations at <br /> Defense Depot Tracy. <br /> The following recommendations are provided: <br /> - Wells LM 63 , 66, 68, and 72 should be screened across the <br /> water table. <br /> - An additional well should be screened across the water <br /> table at the site of LM-55, 56, and 57 . <br /> - Wells LM-64 and LM-69 should screen the same zone as <br /> LM-55 . <br /> - Wells LM-65, 67, and 70 should screen the same zone as <br /> LM-56 . <br /> - Another well should be installed at Location 1 screened in <br /> the same zone as LM-57 . <br /> - LM-71 and LM-74 should be screened in the same zone as <br /> LM-53 and LM-54 . <br /> Other recommendations: <br /> The geologic characterization at this site is very poor to date. <br /> There are no geophysical borehole logs, and the borehole litho- <br /> logic logs are of little value. It becomes even more important <br /> in the upcoming wells to obtain good geologic characterization. <br /> The DHS typically requests continuous cores, but I must emphasize <br /> the value of geophysical logs of the borehole. In order to run <br /> geophysical logs it would be best if the holes were drilled with <br /> the mud rotary technique. Continuous cores could also be <br /> obtained while drilling with mud rotary. <br /> The above recommended screened intervals should be screened with <br /> 10 (ten) foot screen lengths except when the screen is placed <br /> across the water table. <br />