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AMBftIA <br /> The secondary objective of interim GWE was to determine the hydraulic properties of the <br /> aquifers Again, these activities were conducted with the understanding that the existing well <br /> network was not ideal for meeting this objective Step discharge testing determined that the <br /> sustainable yield of the upper water bearing zone is at least 0 75 gpm, and the deeper water <br /> bearing zone is at least 60 gpm Analysis of recovery data estimated aquifer properties that were <br /> fairly consistent with soil types encountered during investigation activities Again, the results <br /> should be considered approximate due to the limiting factors encountered during testing and the <br /> assumptions of the analysis method <br /> RECOMMENDATIONS <br /> At this point Cambria does not recommend additional interim remedial activities at the subject <br /> site With the possibility that the former service station located upgradrent may have had a <br /> release and is the primary source or secondary source of 1,2-DCA, further remedial efforts are <br /> not advisable If 1,2-DCA concentrations are higher beneath the former service station and Shell <br /> were to perform more groundwater extraction (mass removal) events, these efforts may mobilize <br /> the 1,2-DCA plume beneath the upgradrent site Until this upgradrent site can be investigated, <br /> we recommend no further rntenm remedial activities <br /> Cambria recommends continued quarterly monitoring of the existing groundwater monitoring <br /> wells at the site Cambria is prepared to perform site assessment activities at the former service <br /> station property as soon as property access can be obtained <br /> 0797 12 <br />