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r <br /> ' Mr Ron Rowe <br /> Page 5 <br /> We recommend continued operation of the VES with weekly monitoring and monthly vapor <br /> sample analysis Effluent sampling procedures will continue using the vacuum box Based upon <br /> ' the vapor concentrations and the concentration trends observed during the quarter the cost- <br /> effectiveness of continued operation will be evaluated at the end of the first quarter 1999 <br /> ' Ground Zero recommends continuing quarterly sampling to monitor the extent of gasoline <br /> hydrocarbons in groundwater Analysis for oxygenates should continue for wells MW1, MW3, <br /> MW4, MW 11, MW 12, and MW 13 for next quarter The next groundwater sampling event is <br /> ' scheduled for February 1998 Your office will be provided 48-hours notice of any field work <br /> ' Please call if you have any questions regarding this quarterly monitoring and sampling event <br /> Sincerely, <br /> ' Groun Zero Analysis, nc <br /> rry e- ' Justin M Power �����Ea G c � <br /> Project Geologist <br /> GREGORY P. <br /> No. 5023 <br /> ' Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 ATF OF CAL1F�i <br /> ' Attachments <br /> pc Mr Carl Knowles <br /> ' Mr. Pat Riddle, Law Offices of Patrick D Riddle <br /> Mr. Mark List, CRWQCB Sacramento <br /> ro&kq=14gmI W8 <br /> 1 <br />