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August 25, 2014 <br />Mr. Rudolfo Rosas, P.E., Senior Civil Engineer <br />City of Santa Ana — Public Works Agency <br />220 S. Daisy Avenue, #A <br />Santa Ana, CA 92703 <br />Reference: San Lorenzo Sewage Lift Station <br />Proposal to Update Plans, Specifications, and Estimates and <br />Provide Bidding and Construction Support Services <br />Dear Mr. Rosas: <br />Tetra Tech had previously provided professional engineering services for the San Lorenzo Sewer Lift <br />Station as part of Agreement No. A-2005-142. The original approved budget in 2005 was $220,000. <br />The budget was increased by the following: $19,250 by Amendment No. 1; $23,000 for Extra Work <br />dated July 17rh, 2007; and $37,000 for Amendment No. 2. The modified approved budget was <br />$299,250. Tetra Tech submitted substantially completed final contract documents including plans, <br />specifications and cost estimate in March 2009. From that date, Tetra Tech has exhausted its approved <br />funds in supporting the City of Santa Ana in the EIR process for the project. <br />The following correspondence summarizes our proposal to: update the contract documents (plans, <br />specifications and estimates) based on the City's review comments and revisions required by the EIR <br />process; PLC panel design, and development of control strategies (to be performed by Enterprise <br />Automation); provide bidding support services; and provide construction support services. <br />SCOPE OF WORK <br />Task 1: Update Design Criteria <br />Tetra Tech will evaluate the previous design criteria on the following items and provide an update to <br />the City prior to revising the construction plans and specifications: <br />a. Pumps: confirm demands, pump size, selection and manufacturer. <br />b. Grinders: confirm maintenance issues, clearance, and detail inspection ports and conduits. <br />c. Valves: replace gate valves with plug valves and confirm maintenance on check valves. <br />d. Meter: maintenance issues and update specifications. <br />e. Odor Control: update odor control facilities — improve performance of equipment. <br />f. Ventilation: duct material, and confirm adequacy with updated code requirements. <br />g. Radar vs laser: update equipment in wet well and add smart cover. <br />h. Crane: confirm the range and removal limits with available clearance. <br />i. Stair revisions: revise stairway per the City recommendation. <br />j. Meter platform: add platform adjacent to the meter for maintenance, <br />k. Building modifications: modify the mansard above the pump removal access. <br />Tetra Tech, Inc, <br />17885Von Karmen Avenue, Suite 500, Irvine, CA 92614-6213 <br />791949.809.5000 Fax949.809.5010 www.tatratech.com <br />