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Cr all <br /> 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 However, during this event, water levels at the site fell, and concentrations of TPHd, <br /> TPHg, and MTBE in well MW3 decreased <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 a trend of reduction and have remained relatively stable over a period of more than <br /> one year It may be necessary to install additional monitoring wells in order to delineate the <br /> downgradient extent of contamination Because of the periodic flow reversals, one well would <br /> need to be installed to the northwest of the former tankpit and another to the southeast If so <br /> directed, we will submit a workplan to install additional groundwater monitoring wells Should <br /> additional wells be installed, it may be appropriate to reduce the sampling frequency of cross- <br /> gradient wells MW 1 and MW2 We also recommend discontinuing sampling for 1,2-DCA and <br /> EDB, which have never been detected in groundwater at the site <br /> The next round of groundwater sampling is scheduled for November 2001 You will be provided with <br /> a 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 /> gor <br /> Analysis, Inc <br /> �gist 4`" `nom <br /> GREGORY P. <br /> ST;R4-lL <br /> No. 5023 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 OF CA1�F���\P <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 /> w-may chtlgmr13gm2001 doe <br />