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									Chapter 12: Cost Estimate


After the design process was finished, such as completion of the runway, taxiway,
drainage, and grading, the next step was to estimate the cost associated with building the
Lake Mathews Airport. To determine a rough cost estimate, the 2006 RS Means
Construction Cost Data was used as an aid. This means of estimating cost is in
compliance with industry standards. The values obtained from this book include
material, labor, equipment, overhead and profit. Another thing that also needed to be
noted is that there is a slight discrepancy in the prices between the year 2006 and the
present. Some possible reasons for this inconsistency would be due to the increase in
gas prices, the value of materials, and inflation.

In the cost estimate spreadsheet table, pavement, airport lighting, stripping and signage,
landscape, drainage, airport structures, fencing and soundproof walls, and earthwork were
all considered in the cost estimate. For each topic, the specific numerical cost vales can
be seen in Tables 12.1 through 12.6.


Table 12.1. Pavement cost estimate for the Lake Mathews Airport.

                                                                                                                                      Reference
                                          Description                Quantity    Unit     Unit Cost    Per      Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                               Unless stated otherwise)
          Runway                                                                                                                       pg 59
                                 4" Asphault Concrete Overlay        33,333     sq.yd.     $11.40     sq.yd.    $380,000               pg 59
                                 3" Compacted Aggregate Base         34,222     sq.yd.      $7.78     sq.yd.    $266,247               pg 59
                                     9" Aggregate Subbase            34,222     sq.yd.      $9.95     sq.yd.    $340,509               pg 35
                                 6" 90% Compacted Subgrade            6,148     cu.yd.      $6.52     cu.yd.     $40,086
          Taxiway                                                                                                                      pg 59
                                 4" Asphault Concrete Overlay        24,701     sq.yd.     $11.40     sq.yd.    $281,593               pg 59
                                 3' Compacted Aggregate Base         25,360     sq.yd.      $7.78     sq.yd.    $197,300               pg 59
                                     9" Aggregate Subbase            25,360     sq.yd.      $9.95     sq.yd.    $252,331               pg 35
                                 6" 90% Compacted Subgrade            4,227     cu.yd.      $6.52     cu.yd.     $27,558
         Blastpad                                                                                                                      pg 59
                                 4" Asphault Concrete Overlay         3,167     sq.yd.     $11.40     sq.yd.     $36,100               pg 59
                                 3' Compacted Aggregate Base          3,251     sq.yd.      $7.78     sq.yd.     $25,294               pg 59
                                     9" Aggregate Subbase             3,251     sq.yd.      $9.95     sq.yd.     $32,349               pg 35
                                 6" 90% Compacted Subgrade             542      cu.yd.      $6.52     cu.yd.     $3,533
      Perimeter Road                                                                                                                   pg 59
                                 Gravel: 6" at 95% compaction         9,570     sq.yd.     $8.88      sq.yd.     $84,979               pg 35
                                 6" 90% Compacted Subgrade            1,595     cu.yd.     $6.52      cu.yd.     $10,399
         Shoulder                                                                                                                      pg 59
                                 Gravel: 6" at 95% compaction        12,524     sq.yd.     $8.88      sq.yd.    $111,216               pg 35
                                 6" 90% Compacted Subgrade            2,087     cu.yd.     $6.52      cu.yd.     $13,610
     Surrounding Facility                                                                                                              pg 59
  (Includes Hangers & Fuel)      4" Asphault Concrete Overlay        253,336    sq.yd.     $11.40     sq.yd.    $2,888,034             pg 59
                                 3' Compacted Aggregate Base         253,336    sq.yd.      $7.78     sq.yd.    $1,970,957             pg 59
                                     9" Aggregate Subbase            253,336    sq.yd.      $9.95     sq.yd.    $2,520,697             pg 35
                                 6" 90% Compacted Subgrade           42,223     cu.yd.      $6.52     cu.yd.     $275,292
      Vehicle Parking                                                                                                                  pg 59
                                 3" Asphault Concrete Overlay         8,987     sq.yd.     $8.20      sq.yd.     $73,692               pg 59
                                       4" Base Aggregate              8,987     sq.yd.     $5.75      sq.yd.     $51,675               pg 59
                                     7" Subbase Aggregate             8,987     sq.yd.     $9.45      sq.yd.     $84,926               pg 35
                                 6" 90% Compacted Subgrade            1,498     cu.yd.     $6.52      cu.yd.     $9,766
           Street                                                                                                                      pg 59
                                 3" Asphault Concrete Overlay         3,519     sq.yd.     $8.20      sq.yd.     $28,859               pg 59
                                       4" Base Aggregate              3,519     sq.yd.     $5.75      sq.yd.     $20,236               pg 59
                                     7" Subbase Aggregate             3,519     sq.yd.     $9.45      sq.yd.     $33,258               pg 35
                                 6" 90% Compacted Subgrade             587      cu.yd.     $6.52      cu.yd.     $3,824
         Buildings
                                      4' Deep Foundation              2,400     cu. yd.   $247.00     cu. yd.   $592,800               pg 35
                                 6" 90% Compacted Subgrade             300      cu.yd.     $6.52      cu.yd.     $1,956
         Sidewalk                                                                                                                      pg 62
                                    4" x 8" x 2" Brick Paving         6,750     sq.ft.     $10.15     sq.ft.     $68,513               pg 62
                                Handicap Ramp Per ADA Case C            3        e.a.     $1,000.00    e.a.      $3,000                pg 35
                                 6" 90% Compacted Subgrade             131      cu.yd.      $6.52     cu.yd.      $851
      Landscape Area                                                                                                                   pg 35
                              6" 90% Compacted Subgrade (Island)     13,194     cu.yd.     $6.52      cu.yd.     $86,027               pg 35
                              6" 90% Compacted Subgrade (Facility)    395       cu.yd.     $6.52      cu.yd.     $2,574




                          Chapter 11: Cost Estimate – Airport Design – California State Polytechnic University / Page 1
Table 12.2. Airport lighting, striping, and signage cost estimate for the Lake Mathews Airport.

                                                                                                                                         Reference
                                             Description               Quantity    Unit     Unit Cost     Per      Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                                  Unless stated otherwise)
   Airport Facility Lighting                                                                                                              ebay
                                          Runway lighting                38        ea.       $140.00      ea.       $5,320                ebay
                                         Runway Edge Lights              12        ea.       $140.00      ea.       $1,680                ebay
                                           Taxiway lighting              140       ea.       $140.00      ea.       $19,600
       Airport Signage                                                                                                                    pg 74
                                             Airport Signs               50        ea.       $830.00      ea.       $41,500
       Airport Striping
                                            Runway Stripping                                                                              pg 61
                                                Numbering               1,954     sq.ft.      $4.12      sq.ft.     $8,041                pg 61
                                                 Centerline             7,669     sq.ft.      $4.12      sq.ft.     $31,558               pg 61
                                                1' Edge line            8,098      l. ft.     $2.79       l. ft.    $22,593               pg 61
                                                 Chevron                1,744     sq.ft.      $4.12      sq.ft.     $7,177                pg 61
                                                 Aim Point              8,640     sq.ft.      $4.12      sq.ft.     $35,554
                                             Taxiway Striping                                                                             pg 61
                                      1' Hold Down Position Striping     720       l. ft.     $2.79       l. ft.    $2,009                pg 61
                                           1' Taxiway edge lines       14,125      l. ft.     $2.79       l. ft.    $39,409               pg 61
                                          1' Taxiway center lines       6,502      l. ft.     $2.79       l. ft.    $18,141
                                                Apron Area                                                                                pg 61
                                      6" Tie Down (Design Group I)      6,640      l. ft.     $1.37       l. ft.    $9,097                pg 61
                                      6" Tie Down (Design Group II)     1,608      l. ft.     $1.37       l. ft.    $2,203                pg 61
                                          6" Gas Station Parking        1,387      l. ft.     $1.37       l. ft.    $1,900                pg 61
                                        6" Aircraft Parking Striping   16,532      l. ft.     $1.37       l. ft.    $22,649               pg 61
                                   6' Non-movaable/movable Striping     2,410      l. ft.     $1.37       l. ft.    $3,302
                                                  Faciltity                                                                               pg 61
                                          Vehicle Parking Striping       173       ea.        $9.15       ea.       $1,583                pg 60
                                                 Handicap                116      sq.ft.      $4.12      sq.ft.      $477                 pg 61
                                                    Stop                 136      sq.ft.      $4.12      sq.ft.      $560
                                                 Driveway                                                                                 pg 60
                                               6" Centerline             312       l. ft.     $1.37       l. ft.     $427                 pg 61
                                                    Stop                 80       sq.ft.      $4.12      sq.ft.      $329                 pg 60
                                                 Crosswalk               158       l. ft.     $1.37       l. ft.     $216




Table 12.3. Landscape cost estimate for the Lake Mathews Airport.

                                                                                                                                         Reference
                                             Description               Quantity    Unit     Unit Cost     Per      Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                                  Unless stated otherwise)
                                           Islands (grass)             79,166     sq.yd.      $0.42      sq.yd.     $33,250               pg 76
                                           Facility (grass)             2,369     sq.yd.      $0.42      sq.yd.      $995       www.botanicalpartners.com/
                                             Palm Trees                  17        ea.      $1,500.00     ea.       $25,500               pg 77
                                          Shrubs (boxwood)               211       ea.       $39.50       ea.       $8,335




Table 12.4. Drainage cost estimate for the Lake Mathews Airport.

                                                                                                                                         Reference
                                             Description               Quantity    Unit     Unit Cost     Per      Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                                  Unless stated otherwise)
         Storm Drain                                                                                                                     pg 50
                                        24" PVC Diameter Pipe           5,660      l.ft.      $55.50      l.ft.    $314,130              pg 56
                                                Inlets                    8        e.a.      $1,100.00    e.a.      $8,800           www.p2pays.org/
                                         Oil-Water seperator              8        e.a.     $10,000.00    e.a.      $80,000              pg 76
                                              Landscape                 3,933     sq.yd.       $0.42     sq.yd.     $1,652
           Trench                                                                                                                         pg 59
                                              12" Gravel                9,570     sq.yd.      $8.88      sq.yd.     $84,979              pg. 115
                                               12" Sand                 6,976     cu. yd.    $26.50      cu. yd.   $184,864               pg. 40
                                                Hauling                 6,976     cu. yd.     $8.32      cu. yd.    $58,040
            Curb                                                                                                                          pg. 37
                                              Excavation                6,976     cu. yd.     $4.54      cu. yd.    $47,507               pg 61
                                           6" Concrete Curb             4,163       l.ft.     $7.55        l.ft.    $31,431
            Swale                                                                                                                         pg 61
                                               Concrete                 8,440      l.ft.     $20.50       l.ft.    $173,020




                               Chapter 11: Cost Estimate – Airport Design – California State Polytechnic University / Page 2
Table 12.5. Airport structures, fencing, and soundproof walls cost estimate for the Lake Mathews Airport.

                                                                                                                               Reference
                                     Description        Quantity    Unit     Unit Cost        Per        Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                        Unless stated otherwise)
    Airport Structures                                                                                                       pg 394, 706
                                        Hangers         188,012    sq.ft.      $23.60   sq.ft. (floor)   $4,437,083            pg 706
                                    Office Facilities   12,000     sq.ft.     $191.92   sq.ft. (floor)   $2,303,040            pg 706
                                         F.B.O.          4,200     sq.ft.     $191.92   sq.ft. (floor)    $806,064        www.chickasha.org/
                                      Gas Tanks            2        ea.      $53,267.00      ea.          $106,534


     Airport Fencing                                                                                                            pg 65
                                   Perimeter Fencing    18,468      l. ft.    $40.00          l. ft.     $738,720               pg 65
                                    Facility (Fence)      969       l. ft.    $40.00          l. ft.      $38,760               pg 66
                                     Facility (Gate)       2         ea.     $1,150.00         ea.        $2,300                pg 65
                                     Pond Fencing        1,390      l. ft.    $40.00          l. ft.      $55,600
                                                                                                                                pg 65
       Soundwalls                         10'           21,340      sq. ft    $20.00         sq. ft      $426,800               pg 103
                                  2' Deep Foundation     632       cu. yd.    $247.00       cu. yd.      $156,177




Table 12.6. Earthwork cost estimate for the Lake Mathews Airport.

                                                                                                                               Reference
                                     Description        Quantity    Unit     Unit Cost        Per        Total Cost   (Pg. No. Refers to RSMeans
                                                                                                                        Unless stated otherwise)
          Pond                                                                                                                  pg 43
                                       Rip-Rap          14,467     sq. yd      $50.00       sq. yd       $723,356               pg. 40
                                       Hauling          22,751     cu. yd.      $8.32       cu. yd.      $189,284               pg. 37
                                      Excavation        22,751     cu. yd.      $4.54       cu. yd.      $154,931
           Cut                                                                                                                  pg. 40
                                       Hauling          54,246     cu. yd.     $8.32        cu. yd.      $451,325               pg. 37
                                      Excavation        54,246     cu. yd.     $4.54        cu. yd.      $369,414
           Fill                                                                                                                 pg. 40
                                        Hauling         29,280     cu. yd.     $8.32        cu. yd.      $243,613               pg. 37
                                          Fill          29,280     cu. yd.     $7.42        cu. yd.      $217,260




Once the cost estimates were known for all of the individual sections, the total cost of the
airport was calculated by summing up all of the individual aspects. The preliminary cost
for the Lake Mathews Airport was determined to be $23,568,125 roughly, as illustrated in
Table 12.7.



Table 12.7. Preliminary cost for the Lake Mathews Airport.


                                    Description                                         Total Cost


                                      Pavement                                     $10,820,038.02
                          Airport lighting, striping, signage                        $275,324.08
                                      Landscape                                      $68,079.06
                                       Drainage                                      $984,422.17
                       Airport structures, fencing, soundwalls                      $9,071,078.39
                                      Earthwork                                     $2,349,183.04
                         PRELIMINARY COST                                      $23,568,125



                         Chapter 11: Cost Estimate – Airport Design – California State Polytechnic University / Page 3
For the airport, a contingency plan was also developed. The contingency plan was
developed according to the 2006 RS Means Construction Cost Data. For the Lake
Mathews Airport, this includes 20 percent for the conceptual stage, five percent for
unfavorable economic conditions, four percent for unaccounted utilities, and one percent
for unaccounted permits. The 20 percent conceptual contingency would cover any
changes and overage costs during the construction phase. For example, if the cut and fill
cost was determined to be more than what the engineers planned then that extra cost
would already be accounted for in the cost under this particular contingency. The five
percent economic contingency would cover the discrepancy in prices between the 2006
and present values due to the increase in gas prices, value of materials and inflation. The
four percent unaccounted utilities contingency would account for the cost of utilities that
was not accounted for in the initial design process. The one percent permit contingency
would cover the cost of permits that was not accounted for in the unit cost. This accounts
for a total of 30 percent added on to the total preliminary cost.

With the continguency plan that was developed for the Lake Mathews Airport, the cost of
the airport would increase by $7,070,437. Considering the 30 percent contingency plan,
the total cost for the Lake Mathews Airport was brought up to $30,638,562. This value
seemed reasonable, but only after the cost with contingency was considered.




               Chapter 11: Cost Estimate – Airport Design – California State Polytechnic University / Page 4

								
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