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EPA COMMENTS ON <br /> THE FINAL WELL MONITORING PROGRAM <br /> QUARTERLY MONITORING REPORT <br /> JANUARY AROUND <br /> T DDRW TRACY <br /> INTRODUCTION <br /> 1 <br /> agricultural wells found to be <br /> include the locations of the RASP agricultural wells. The <br /> Figure 1-3 does not domestic or ag <br /> locations of these wells and any other <br /> epresentaffect the pote in futtr e <br /> located downgradient from the site should be represented on this figure in future <br /> iC <br /> reports since pumpage from these wells may profoundly <br /> surface. <br /> in the Upper Tulare <br /> maximum contaminant leve <br /> 2, Section 1.2.1.2 summarizes that trichloroethene (TCF) and tetrachloroethene (PCE) <br /> round section that <br /> have been detected above mlis background <br /> (MCLS) <br /> formation beneath the site. Please make mention in th <br /> additional contaminants r above sta <br /> have consi teldetectedy been <br /> background <br /> ofCaliforniaact on levels. These above <br /> contaminants are dieldrin, arsenic, chromium, and manganese. <br /> FIELD PROCEDURES as <br /> from the Work Plan <br /> 3, Field procedures and explainededlea SYca d `vereetion 2.4 apP opr ate re ponses t field <br /> Addendum) <br /> conditions. <br /> HYDROGEOLOGY obvious <br /> 4, Figure 3-1 and upper horizon groundwater elevation data present a veryThis effect <br /> drawdown of the water table in the northeast corner of DDRW- racy. <br /> on upper groundwater elevations in that areavery he well be the result of <br /> upper horizon. Based on well <br /> pumping from a downgradient well drawing ear to be no downgradient <br /> locations presented at the time of this report, there app <br /> wells that would have the potential to cause this drawdown. <br /> horizon, and there are <br /> attempt to explain this apparent drawdown in the upperUpper Tulare formation <br /> apparent drawdown. Additional <br /> insufficient data points available in this area in all of the <br /> to further explore the extent of the impact need tof the o be established to identify this potential <br /> data points in the upper horizon may <br /> pathway for migration of groundwater off-site should this trend continue. <br /> Since well construction logs of the Pombo and Raspo private wells, shown on Figure <br /> pumping at either of <br /> upper horizon. At any rate, <br /> I-3, are not available, it is not possible to state whether heavy p <br /> these wells might provide such a marked result in the upposition from the <br /> ears to be in a directly downgradient <br /> neither of these wells app <br /> review of aerial photographs, (particularly <br /> apparent drawdown. Based 2) a cursory <br /> March 1974 and July 10, 1982), one explanation that should be explored is the <br /> 1 <br /> EPA/R9 19 J=93 <br />