Tracking of Modifications 3/12/09

Animas - La Plata Project
Tracking of Modifications
Contract No. 04 -NA-40 -8051
Dam Foundation Excavation, Roads, and Drop Structures
Modification
Date
12- Mar -09
Number
Executed
Amount
Description of Modification
001
28- Jan -04
$ -
Modification directs changes to Drop Structure 4. Scope of work includes placing Zone 4A in the majority of the structure in lieu of
Zone 1, performing revised foundation excavation and cleanup requirements, placing a grouted riprap stilling basin, and placing
soil cement bedding under the drain pipe.
002
02- Feb-04
$ 85,000
Modification directs slope stabilization on the downstream right abutment colluvium cut slope in the form of chainlink fabric,
shotcrete and ground anchors.
003
004
24- Feb -04
01 -Mar -04
$ 223 533
$ 1.500,000
Modification definitizes the contract Price adjustment for the changes directed under modification 001
Modification directs work required to develop a portion of Borrow Area B. Scope of work includes stripping topsoil and removing
clay overburden. Overburden material was used to construct a suitable foundation for the materials processing plant for
processing dam embankment materials.
005
05- Mar -04
$ 755,127
Modification directs work required to furnish and stockpile riprap materials for use in constructing drop structures and other
project features. Riprap obtained from a private source located North of Vallecito reservoir.
006
04- Mar -04
$ 187,000
Modification directs the clearing, grubbing and disposing of all woody plant material from the portions of Borrow Area B and the
waste area North of Borrow Area B.
007
008
009
010
04-Mar -04
24 -Mar -04
08-Apr-04
21 -A r -04
$ 99,000
$ 13 030
$ 2 364
$ -
Modification directs the installation of 16,000 linear feet of four strand wire stock fence 2 cattle guards, and 4 metal stock gates.
Modification definitizes the contract price adjustment for the changes directed under modification 007
Modification definitizes the contract price adjustment for the changes directed under modification 006
Modification definitizes the contract price adjustment for the changes directed under modification 005
011
26 -Mar -04
$ -
Modification directs the extension of the well casing of an existing water well located in the area being constructed for the
materials processing plant.
012
07-Apr-04
$ -
Modification directs work to repair the headgate structure on the Pine Ridge ditch. Scope of work includes excavating by -pass
channel reconstructing the abutment and removing the by-pass.
013
21 -A r -04
$ 60,000
Modification directs work required to perform rock excavation, using blasting techniques, to shape the shale formation unit
encountered on the Ridges Basin Dam left abutment.
014
05 -Ma -04
$ 37,518
Modification requires the relocation of a stockpile of materials located in the area to be constructed for the processing plant for
future use on the project.
015
016
017
02-May-04
05-May-04
20-May-04
$ -
$ -
$ 40,000
Modification directs the installation of riprap in lieu of articulated concrete block for the Drop Structure 4 spillway.
Modification directs a change in the -gradation re uirements for the riprap to be furnished under Modification No. 010
Modification increases the funding limitation for Modification No. 013.
Modification directs a cattle guard and stock gates to be furnished and installed, an existing gate to be relocated, and shotcrete to
be installed on the rock slo a at the dam crest road.
Modification directed changes to the work directed under Modification No. 004. These changes added additional excavation for
the dump wall and added the Basin Creek waste fill area as a waste area for the stripped materials from Borrow Area B.
Modification definitizes the contract price adjustment for the changes directed under modification 012
Modification definitizes the contract price adjustment for the changes directed under modification 011
018
02- Jul -04
$ 40,000
019
020
021
09 -Au -04
05- Nov-04
05- Nov -04
$ -
$ 1,231
$ 1,026
022
27-Sep-04
$ 419 785
Modification directs work required to complete the La Plata River Restoration. The scope of work includes channel and floodplain
construction; boulder J- hooks; scour holes; bankfull channel bends and pools; boulder bank protection; and grade control
structure.
Modification definitizes the contract price adjustment for the changes directed under modification 022
Modification definitizes the contract price adjustment for the changes directed under modification 024
Modification directs the construction of an embankment buttress to stabilize rock slides on the left abutment foundation
excavation and improve the downstream and upstream foundation access ramps.
023
024
025
16 -Dec-04
01- Feb -05
18- Jan -05
$ -
$ 30,092
$ 683,982
026 1
28 -Jan -05
$ 700,000 includes
Modification directs the contractor to design and install an unwatering system for the dam foundation area. Scope of the work
providing unwaterna eauioment ditches
-- 1vunuvr0wI 01 u PI CGI ICdIIUM