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Sohn &Maxine Ferraiolo -2- January 22, 2003 j • If a different scope of work becomes necessary, then you must request pre-approval of costs on the new scope of work. • Although I have referred to the GZA proposal in my pre-approval above,please be aware that you will be entering into a private contract: the State of California cannot compel you to sign any specific contract. I also want to remind you that the Fund's regulations require that you obtain at least three bids, or a bid waiver from Fund staff, from qualified firms for all necessary future corrective action work. If you need assistance in procuring contractor.and consultant services, don't hesitate to call.me. - - i Please remember that it is still necessary to submit the actual costs of the work asexplained in the Reimbursement Request Instructions to confirm that the costs are consistent with this pre- approval before you will be reimbursed. Please insure that your consultant prepares their invoices to include the required breakdown.of costs on a time and materials basis, that invoiced tasks are consistent with the original proposal, and that reasonable explanations are provided for any changes made in the scope of work or increases in the costs. When the invoices are submitted you must include copies of all: • subcontractor invoices, • technical reports; when available, and • applicable correspondence from the County. Please call if you have any questions; I can be reached at (916) 341-5796. Sincerely, Mark Owens, Water Resources Control'Engineer ` Technical Review Unit Underground Storage Tank Cleanup Fund Enclosure cc: San County Environmental Health Department; Stockton Gregory Stahl Ground Zero Analysis, Inc. 1714 Main Street Escalon, CA 95320 j i Cahforafa Environmental Protection Agency � I Recyc%dPeper j