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Mr Ron Rowe <br /> Page 5 of 5 <br /> ' RECOMMENDATIONS <br /> Develop Closure Criteria and Evaluate Current Conditions <br /> 1 As proposed in our workplan (09/17/99), we recommend drilling soil borings to evaluate the <br /> effect vapor extraction on residual soil contamination and to further define the vertical limits of <br /> contamination We also recommend fate and transport modeling and a risk based corrective action <br /> evaluation Based on these evaluations, site specific criteria should be developed to determine at <br /> what point investigation and remediation should cease and the case be closed Pending <br /> completion of those tasks we recommend the following <br /> VES Operation <br /> ' We recommend discontinuing vapor extraction at this time Figure 3 depicts influent vapor <br /> concentrations and Figure 4 equates the dollar cost of operating the system to gallons of gasoline <br /> ' removed from the subsurface These figures illustrate the significantly diminished returns of <br /> system operation in recent months System operation was suspended on January 3, 2000 <br /> Quarterly Groundwater Monitoring and Sampling <br /> We will perform groundwater monitoring and sampling for the first quarter in February 2000 <br /> Your office will be provided with 48-hours notice of any field work Please call if you have any <br /> questions or comments regarding this quarterly monitoring and sampling report <br /> Respectfully, <br /> 7dera Analyse Inc <br /> ED Ct. zo <br /> Justin M Power, <br /> ' Pro eologist GREGORY P. <br /> oHL <br /> � <br /> No. <br /> 5023 � <br /> Gregory P Stahl, RG 5023 ul g <br /> CA Certified Hydrogeologist 264 qj�OF CAi-tF�Q� <br /> ' Attachments <br /> PC Mr Carl Knowles <br /> Mr Pat Riddle, Esq , Law Offices of Patrick D Riddle <br /> Mr Mark List, CRWQCB Sacramento <br /> Mr Daniel J Schroeder, Esq , Neumiller& Beardslee <br /> roekVpw\4gm 1999 <br /> i ' <br />