Preliminary Construction Quantity Estimates. Cost estimates will be performed for the identified most feasible drainage alternatives based on the recommendations in the above tasks and the City concurrence. A preliminary estimated cost of construction will be generated from the quantity estimate using approved unit costs from the City. Unit costs will be based upon the most current cost information for recent similar projects in the area compiled by Consultant and approved by the City. The total project costs for each alternative will then be estimated which include line items for project design, survey, geotechnical, administration and construction support. In addition, intangible costs for alternative systems will be investigated, such as environmental mitigation, if these are determined to be critical for a particular system. Major physical constraints will be included in the estimate such as (1) land acquisition, (2) street paving and traffic control, (3) utility relocation or protection, and (4) compliance with the current NPDES MS4 permit.
