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RECOMMENDATIONS Mr Ron Rowe <br /> ' <br /> Develop Closure Criteria and Evaluate Current Conditions <br /> As proposed in our workplan dated September 17, 1999 we recommend drilling confirmation soil <br /> borings to evaluate the effect of the vapor extraction effort on residual soil contamination along <br /> with fate and transport modeling and a risk based corrective action evaluation Based on these <br /> evaluations, site specific criteria should be developed to determine at what point investigation and <br /> remediation should cease and the case closed Pending completion of those tasks we recommend <br /> ' the following <br /> VES Operation <br /> We recommend continued operation of the vapor extraction system dunng the fourth quarter of <br /> 1999 We anticipate recommending discontinuation of vapor extraction after this time <br /> ' Quarterly Groundwater Monitoring and Sampling <br /> ' We will perform groundwater monitoring and sampling for the fourth quarter in November 1999 <br /> At your request, and as recommended in our September 17 workplan, all wells will be analyzed <br /> for oxygenates during this event Your office will be provided with 48-hours notice of any field <br /> work <br /> Please call if you have any questions or comments regarding this quarterly monitoring and <br /> ' sampling report <br /> Sincerely, <br /> ' Ground Zero Analysis, IncrL" /J _ <br /> aED GE <br /> D�o <br /> �o!Z Justin M Power, GREGORY <br /> P. <br /> � � <br /> ' Project Geologist STAH�No. 5023 <br /> MATE OF CAUF����' <br /> Gregory P Stahl, RG 5023 <br /> CA Certified HydrogeoIogist 264 <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 , Neunuller& Beardslee <br /> rmklgnrl3gm i 999 <br /> II <br />