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f <br /> 1. 1 . 0 RECOMMENDATIONS <br /> ASE recommends the following <br /> f 1 ) Install two additional groundwater monitoring wells, one west of <br /> MW-13 across West Yosemite Avenue from the site to verify the <br /> horizontal extent (width) of the plume downgradient of the site, a n d <br />' a second well further downgradient of monitoring well MW-13, <br /> possibly in Airport Way, to verify the downgradient extent o f <br /> contamination <br /> 2 ) Conduct pumping, vapor extraction and air sparging tests at the site <br />' as a preparation to preparing a corrective action plan This task will <br /> require the installation of a vapor extraction well, as well as an air <br /> sparging well <br />' a corrective action plan for the site <br /> 3 } Prepare <br />' 4 ) Continue quarterly groundwater sampling at the site However, ASE <br /> proposes the following modification to the sampling plan <br /> • Monitoring well MW-1 has never contained petroleum <br /> hydrocarbons over DHS MCLS and has only once contained ICE <br />' above DHS MCLS ASE proposes that this well be sampled on a <br /> semi-annual basis (Spring and Fall) <br />' . Monitoring well MW-2 has had very consistent results with only <br /> low MTBE and PCE concentrations below DHS MCLS ASE <br />' recommends that the sampling frequency for this well be reduced <br /> to annual sampling (Spring only) <br />' • Since variable MTBE and TBA concentrations have been detected <br /> in monitoring well MW-3, ASE recommends that the sampling <br /> frequency foi this well remain quarterly <br /> 1 <br /> w W-4 and MW-6 have hydrocarbon <br /> Since monitoring els M y <br />' concentrations exceeding DHS MCLs for drinking water, ASE <br /> recommends that these wells remain on a quarterly sampling <br /> schedule Monitoring well MW-5 should also be sampled on a <br /> quarterly basis anytime that it does not contain free-floating <br /> hydrocarbons <br /> Franks One Stop Report — May 2000 <br />' -15- <br />