Cost Analysis

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Comparative cost analysis of Curb and Gutter Type 2 (1-B & 1-M) and alternate of Type 4 Curb (Section B) (Key-Way).  Prices are taken from 2008 CDOT Cost Data.  This analysis is based on an installation of 1000 linear feet of curb in a median island installation for ease of comparison.

Keyway Curb Type 4…….$7.10 (saw cut, asphalt patch, haul off not needed) Pay item # 609-40031

Type 2 (1-B)………………$12.37 pay item # 609-21010

Type 2 (1-M)……………..$16.77 pay item # 609-21011

6 Inch saw cut asphalt…….$ 1.04 pay item # 202-05026*

Traffic Control…………….$ 1.00 per foot or $1,000 per day**

Asphalt patch…………….$ 4.98 for 1 foot wide at 6 inches thick

Asphalt patch…………….$ 9.96 for 2 foot wide at 6 inches thick

Type 2 (1-B) with  a 1’ patch back and T/C costs  $19.39 per lf.

Type 2 (1-B) with  a 2’ patch back and T/C costs  $24.37 per lf.

Type 2 (1-M) with a 1’ patch back and T/C costs  $23.79 per lf.

Type 2 (1-M) with a 2’ patch back and T/C costs  $28.77 per lf.

TYPE 4 (KEY-WAY) with T/C costs $8.10 per lf.

This data supported analysis shows a SAVING of 59-72% when comparing Keyway Curb against Curb and Gutter in a Right-of-Way retrofit installation.

* This number does not include asphalt removal and truck time to haul off.

** This assumes completion of saw cut, removal, base prep, curb and gutter placement and patch back all in ONE day.

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Cost Data Taken From CDOT 2008

Line Item . . . . . Description . . . . . . . . . . . . . . . . . . Quantity . . . . . . . Ave. Unit Price

202-05826          Saw Cut Asphalt 6 inch                 49,856                     $ 1.04

403-00720         Asphalt Patching per ton                16,238                    $ 136.28

609-21010          Curb and Gutter Type 2 (I-B)       14,344                     $ 12.37

609-21011           Curb and Gutter Type 2 (I-M)      9,073                      $ 16.77

609-40031          Curb Type 4 Sec. B (Key-Way)     3,784                      $  7.10

Asphalt Assumptions:

1 Square yard                                      =  9 linear feet

1 ton                                                    =  2000 lbs.

1 square yard / inch of asphalt            =  110 lbs

110 lbs. ¸ 2000 lbs.                             =  .055 tons per square yard/inch deep

* According to 2008 cost data Asphalt patching is $136.28 per ton per pay item # 403-00720

** This calculates to $.83 per square foot 1 inch deep.