1990 AGN MAY 15 I10 - Laserfiche WebLink

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KmEGEQ WORPORATED • ENGINEERING CONSULTANTS 3602 univefsiry Av • Riverside, CA 91501 • Tel 714.684-6900 • Fox 714.369.5026 April 11, 1990 1 312.23.1 Jr lhn C. Hutton. Public l orks Director City of Colton 650 NOL tiI La Cadena Drive ,;olton, California 92324 Subject: 1.0 MCD Secondary Wastewater Treatment Plant Expansion Revised Engineering Costs M;y Purchase Order No. 21882 Dear 111r. liuttolt: As discussed with Terry Lyons, costs to provide engineering services for subject project have exceeded the $170,538.70 authorized by subject purchase order. Accordingly, we request that the City increase the &Mouizt authorized for engineering services. Costs to provide engineering services are greater than we previously estimeat.ed due to the need to provide full-time inspection services (verses half-time inspection services), the need to provide inspection services over an 11. month construction period (verses 8 months), and an apparent misunderstanding in the preparation of City Change Order No. 2 to subject purchase order for engineering services: The additional costs are summarized in attacheci table and described below: 1. Althuugh we had hoped that it would be possible to provide half- time inspection and engineering supervision during construction of subject traattment facilities, it is apparent that we were too optimistic:. Due to the complexity of the construction and tight schedule, the Contractor has had several crews working simultaneously. Accordingly, to prevent construction delays, full-time field inspection and engineering supervision has been required, tie estimate additional engineering costs for full-time inspection to be $40,000 (additional $5,000 per month for September 1989 through April 1990). 2. Ve originally estimated that treatment plantconstruction would be culnpleted by April 1990 (8 months). Due to construction delays required to &CeOmmOdate preliminary site work stipulated in the City's agreement to acquire the Coehlo property (1 month) and unai'iticipated impediments to scheduled material deliveries (2 months), we cur):ently estimate that completion of construction may be delayed up to 3 months to the @Iid of July 1990. Accordingly, we estimate costs for additional full-time inspection of $30,000 (additional $10,000 per month for May 1990 through July 1?90).