Technical Memorandum From: Katelyn Swinski Date: November 12, 2019 Subject: Homework 8 – Cost Estimating Executive Summary This technical memo provides an opinion of probable construction cost for the City of Gainesville to build an equipment storage building. Aspects considered in this memo are: 1. Cost Analysis 2. Quantity Calculations 3. Opinion of Probable Cost The calculations made for this analysis are shown for 30% conceptual design, do not reflect the cost of the final product. It is recommended that the equipment storage building be constructed in its proposed location through the creation of a storm water treatment pond nearby. 1. The site is flat and slightly wooded, good for clearing and grading. 2. Excavation for the pond will create the amount of fill needed for embankment of the roadway and building structure. 3. Soil testing indicates it is suitable to use as fill. Objective Construct a simple, uninsulated, naturally-ventilated, pre-engineered steel building that will be open on the south side with no additional doors or windows. This building will be supported by 20” by 10” reinforced concrete strip footings with a 6” thick concrete floor. This project will also include the construction of a 6” thick concrete approach apron, a 325’ long asphalt driveway and a storm water treatment pond. The objective is to use already present resources (i.e. fill from the storm water pond or a pre-engineered building) to keep costs as low as possible. Methodology Complete all ground and geotechnical work by clearing the site and completing all excavation, fills, and compaction prior to structural or final work. 1. 2. 3. 4. Excavation of Stormwater Treatment Pond Create embankment for structure and roadway using excavated soil Construct footings and floor slab Add building structure 5. 6. 7. 8. Complete Stormwater Treatment Pond with drainage structures Construct roadway/asphalt driveway Install lighting and electrical (to be done by outside source) Grass and landscaping Quantity Takeoff Calculations 1. Stormwater Treatment Pond ½ * (25 + 75) * 5 = 250 ft2 250 / 9 = 27.7 S.Y. 250 x 275 = 68750 cubic feet 68750 / 27 = 2546.3 C.Y. 2. Fill for Structure and Concrete Apron ½ * (140 + 150) * 1 = 145 ft2 145 / 9 = 16.1 S.Y. 145 x (50 + 75) = 18125 cubic feet 18125 / 27 = 671.3 C.Y. 3. Fill for Roadway ½ * (24 + 31) * 1 = 27.5 ft2 27.5 x 325 = 8937 cubic feet 4. Excavation minus Fill Total Fill: 27062.5 cubic feet 68750 – 27062.5 = 41687.5 cubic feet extra from excavation Opinion of Probable Cost The cost of this project is estimated to be $403,774. This is an underrepresentation of the total project cost. Limitations to this estimate include the amount of man hours needed to complete the project. There are also costs associated with transporting equipment and materials to and from the site. Quantity Takeoff Calculations Calculations suggest that the volume of the excavated soil from the Stormwater Treatment Pond will exceed the amount of soil required to create the embankment for the structure and roadway. As a result, the use of dump trucks will be required to haul excess soil off the property. This soil can be taken to sand and gravel mine sites to fill and level previously mined areas. As a result, holes are filled to promote better drainage in the area. There is also always a constant need for fill dirt at other construction sites to allow for recreational, commercial, or residential development. As a result, there are places which store excess fill dirt from sites as well.