Attachment_17_Historic_Culvert_Restoration.docx

Historic Culvert Restoration

Historic Culvert I-7 (Range Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) The culvert pipe is 18-inches in diameter and shall be replaced completely with new HDPE pipe.

4) The distance from back of headwall to back of headwall is 27’-2 1/2”. This is close enough to 28-ft to NOT REQUIRE moving the headwall to achieve a back of headwall to back of headwall distance of 28 feet.

Historic Culvert I-7 (Salado Creek Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) Grading around the culvert pipe to facilitate positive drainage in and out of the culvert pipe.

4) Additional brush clearing is required for 20 feet from the culvert headwall towards Salado Creek and the width of the headwall plus 5-feet on each side. This shall include clearing all brush and small trees and insuring the area around the pipe outfall is unobstructed and provides positive drainage.

Historic Culvert I-9 (Range Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones and installation of new stones to raise the headwall about 12-inches above the pavement surface. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) The culvert pipe is 24-inches in diameter and shall be replaced completely with new HDPE pipe.

4) The distance from back of headwall to back of headwall is 20’-10”. The Range Side headwall shall be moved to achieve a back of headwall to back of headwall distance of 28 feet.

Historic Culvert I-9 (Salado Creek Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) The Contractor shall provide grading around the culvert pipe to facilitate positive drainage into and out of the culvert pipe.

3) Additional brush clearing is required for 20 feet from the culvert headwall to the creek. This shall include clearing all brush and small trees and insuring the area around the pipe outfall is unobstructed and provides positive drainage.

Historic Culvert I-10 (Range Side)-

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones and installation of new stones to raise the headwall about 12-inches above the pavement surface. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) The culvert pipe is 18-inches in diameter and shall be replaced completely with new HDPE pipe.

4) The distance from back of headwall to back of headwall is 26’-6”. The Range Side headwall shall be moved to achieve a back of headwall to back of headwall distance of 28 feet.

Historic Culvert I-10 (Salado Creek Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) The Contractor shall provide grading around the culvert pipe to facilitate positive drainage into and out of the culvert pipe.

Historic Culvert I-11 (Range Side)-

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) The culvert pipe is 30-inches in diameter and shall be replaced completely with new HDPE pipe.

4) The distance from back of headwall to back of headwall is 27’-11 1/2”. This is close enough to 28-ft to NOT REQUIRE moving the headwall to achieve a back of headwall to back of headwall distance of 28 feet.

Historic Culvert I-11 (Salado Creek Side)

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, replacement of missing stones, and grading around the culvert pipe to facilitate positive drainage into the culvert pipe.

2) Additionally, the newer TxDOT Type Headwall in back of Historic Culvert I-11 South is to be demolished and removed completely and replaced with pipe.

Historic Culvert I-12 (Range Side)

1) Restoration involves complete rebuilding of the headwall and non-abrasive complete removal of all paint and cleaning of the culvert headwall, and replacement of missing stones. In lieu of water blasting, rebuild the historic headwalls or flip the existing stones over, so yellow paint side is inward and not visible. Contractor shall relay stones in an un-coursed random rubble type pattern. If Contractor decides to remove paint by water blasting method and some paint remains in pores of rock, as long as it is not noticeable from 20 feet away, that will be okay.

2) Contractor shall install 2 new yellow reflectors attached to one new galvanized steel pole with concrete foundation on each side of each headwall. Reflector poles shall be located about a foot past the edge of the shoulder.

3) The culvert pipe is 18-inches in diameter and shall be replaced completely with new HDPE pipe.

4) The distance from back of headwall to back of headwall is 23’-9 1/2”. The Range Side headwall shall be moved to achieve a back of headwall to back of headwall distance of 28 feet.

Historic Culvert I-12 (Salado Creek Side)-

1) Restoration involves non-abrasive complete removal of all paint and cleaning of the culvert headwall, replacement of missing stones, and grading around the culvert pipe to facilitate positive drainage into the culvert pipe.