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Mr Michael Infurna <br /> Page 3 <br /> RECOMMENDATIONS <br /> Groundwater flow at the site appears to periodically reverse between the directions of northwest <br /> and southeast Petroleum hydrocarbon concentrations in well MW3, installed within the former <br /> tankpit, are showing a trend of reduction, while MTBE has 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, however, due to the periodic flow <br /> reversals, one well would need to be installed to the northwest of the former tankprt and another <br /> to the southeast If so directed, we will submit a workplan to install additional groundwater <br /> monitoring wells Should additional wells be installed, it may be appropriate to reduce the <br /> sampling frequency of cross-gradient wells MWI and MW2 We also recommend discontinuing <br /> sampling for 1,2-DCA and EDB, which have never been detected in groundwater at the site <br /> The next round of groundwater sampling is scheduled for February 2002 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 converuence <br /> Respectfully, <br /> Groun er is, Inc <br /> e e✓) S���ED <br /> Staff Ge logist � <br /> � GREGORY P.STAHL <br /> Gregory P Stahl, RG 5023 No. 5023 <br /> CA Certified Hydrogeologist No 264 <br /> Attachments OF CAL�F����' <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-sey chtlgmrl4gtm2001 doc <br />