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Mr. Mark Maloney April 21, 2008 Page 6 Proposed Budget Adjustment for Additional Lake User Survey Work and Unforeseen Calibration Difficulties Expected Cast: $8,600 (by Barr) Overall the project has fallen behind schedule due to the unforeseen calibration difficulties, such as Lake Owasso's outlet structure not functioning as designed, the Lake Wabasso outlet structure failing, and the atypical 2007 climatic conditions. The unexpected calibration difficulties have resulted in a cost overrun of about $5,115 associated with Tasks 004 and 005 (as shown. on the February 2008 invoice). Also, as previously reported. on the July 19, 2007 progress invoice report,. the development of the Lake User Survey (Task 010) required more effort than originally anticipated which caused unforeseen costs (e.g., unplanned meeting with stakeholders to collect input on the lake user survey; manager's request to development of an on-line survey in addition to the mailing; additional postage related to the number of mailings; and associated project management tasks). In July 2007 we believed that the added costs for the unscoped Lake User Survey work could be recovered by other compensating project efficiencies. However, the unexpected calibration difficulties exceeded all other project budget savings (lake sediment care collection and analysis and P8 watershed model development). As a result the combined overage is almost $8,600. Therefore, we would like to discuss adjusting the project budget by this amount at the February 28, 2008 GLWMO meeting. evised Schedule and Additional Budget This Agreement will be effective for the duration. of the services unless earlier terminated by either you or us. We will commence work upon receipt of a copy of this letter signed by you. We will complete this work as quickly as possible, and plan to be substantially done by the end of 2008 (see Attachment A). We will inform you of our progress by invoice detail and periodic attendance at the regular GLWMO meetings. For the services provided, you will pay us according to the Standard Terms. We will bill you for our services approximately once every 4 weeks and the City will in turn pay each invoice within 45 days of the invoice date. The cost of the additional services will not exceed $42,600 without prior approval by you and is detailed in Attachment B. We understand that you have the authority to direct us. We will direct communications to Mr. Maloney at the address on this letter. Direction should be provided to Mr. Scott Sobiech, Barr's Project Manager at the letterhead address. P:\Mpls\23 MN\62\2362946\WorkFiles\ProjectManagement\ForGLWMO_04212008\Letter_Contract-Revised SCOpe_Apri121..dOC April 21, 2008 Version