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Mr Michael Infurna <br /> • Page 3 <br /> Analytical results in well MW3 from previous quarterly events showed a general reduction in <br /> contaminant concentrations as the water level at the site rose, and an increase in concentrations as the <br /> water level fell During this event, water levels at the site fell, and concentrations of MTBE and TPHd <br /> in well MW3 increased, TPHg decreased slightly, however <br /> RECOMMENDATIONS <br /> Groundwater flow at the site appears to periodically reverse between the directions of northwest <br /> and southeast Contaminant concentrations in well MW3, installed within the former tankpit, <br /> Have shown no clear trend of increase or reduction, but have remained relatively stable over a <br /> period of more than one year It may be necessary to install additional monitoring wells in order <br /> to delineate the downgradient extent of contamination Because of the periodic flow reversals, <br /> one well would need to be installed to the northwest of the former tankpit and another to the <br /> southeast If so directed, we will submit a workplan to install additional groundwater monitoring <br /> wells Should additional wells be installed it may be appropriate to reduce the sampling frequency <br /> of cross-gradient wells MW 1 and MW2 <br /> The next round of groundwater sampling is scheduled for August 2001 You will be provided with a <br /> minimum of 48 hours notice prior to conducting fieldwork If you have any questions or comments <br /> please contact Ground Zero at your convenience <br /> • Respectfully, <br /> Ground Ze ysis, Inc <br /> S e ' GREGORY P. <br /> Staff~Geologist STAHL <br /> /__�il No. 5023 <br /> Gregory P Stahl, RG 5023 OF <br /> CAL�F��a�' <br /> CA Certified HydrogeoIogist No 264 <br /> Attachments <br /> cc Mr Norm Crum, Woolsey Oil, Inc <br /> Ms Karen Collins, Environmental Closures, Inc - - <br /> Mr Marty Hartzell, RWQCB <br /> Mr Richard McPherson, Property Owner <br /> --bey chtlgmr12gm2001 doc <br />