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1 <br /> 5 RECOMMENDED ACTION <br /> Prior to defining the mass of the pollutant, its mobility and fate, additional exploration is <br /> necessary While a very conservative- large amount of mass- might be assumed, <br /> ' closely defined spacial parameters, estimated density and speciation of the petroleum <br /> hydrocarbons will serve to achieve closure faster and at a lesser cost <br /> ' The following recommendations towards an expeditious completion are offered <br /> 5.1 Define Plume Boundary Offsite <br /> Additional borings are necessary to define the extent of the contamination to the north <br /> ' and east Until a clean boring or one of very little contamination is completed an <br /> estimate of the volume of contamination would be highly speculative <br /> 52 Evaluate Groundwater Quality <br /> The standard to which remediation goals may be held should reflect the "ambient" or <br /> ' existing groundwater if it is not capable of supporting beneficial uses, particularly, if <br /> eventual natural attenuation of the petroleum hydrocarbons can be anticipated <br /> 5.3 Weigh Remediation Options <br /> Current uses and importance of urgency of restoration must be considered on an <br /> economic basis The source has been removed <br /> 54 Agreed Remediation Program <br /> Common agreement on goals and methodology between the CVRWQCB, PHDIEHD <br /> ' and the Owner is necessary before further outlaying capital <br /> ' 5-1 <br />