12.05.110 Amendment additions to sections of MAG Uniform Standard Specifications for Public Works Construction, and MAG Standard Details for Public Works Construction.
For the purposes of this chapter, Chapter 15.35 SCC is hereby amended with the following additions. Except where noted below, “engineer” shall mean the applicant’s engineer, “contractor” shall mean the applicant or contractor hired by the applicant, and “contracting agency” shall mean the applicant. The sections specified below in MAG Uniform Standard Specifications for Public Works Construction, and MAG Standard Details for Public Works Construction, are amended with additions as follows; section references, except as noted, are to those standards:
A. Construction Stakes, Lines and Grades. The permittee shall be responsible to ensure that all construction stakes, lines and grades shall be in accordance with Section 105.8.
B. Samples and Testing of Materials. The permittee shall be responsible to ensure that, when so required by the permit, he shall employ an independent testing laboratory to test all physical materials, at his cost, pursuant to Section 106.2. Testing shall be in accord with standard methods approved by AASHTO, ASTM, or other method approved by the city engineer.
C. Use of Explosives. The permittee shall be responsible to ensure that a permit for blasting is obtained from the Sedona fire department. A copy of this permit shall be provided to the city engineer by the permittee. The use of explosives shall be in accordance with MAG Section 107.8.
D. Preservation of Property. The permittee shall be responsible to ensure that existing landscaping shall be preserved and special care given to protect trees and large shrubbery, in accordance with SCC 12.05.070(C)(3)(b) and Ordinance 94-08, as amended. The permittee shall also be responsible to ensure that property protection shall be in accordance with MAG Section 201.2.
E. Backfilling and Compacting. Nonshrink backfill material may be used in any city right-of-way. Use of other backfill materials shall be subject to city engineer review and approval. Verification of in-place density shall not be required for nonshrink material. Verification of in-place density shall be required for all native material and ABC backfills located under paved surfaces.
1. Specifications for Nonshrink Backfill and Compaction. Specifications for nonshrink backfill and compaction which follow shall be mandatory for all paved rights-of-way and for trenches using nonshrink backfill. These specifications may be used for nonpaved rights-of-way as an alternative. City of Sedona standard “Non-Shrinking Backfill” shall be part of this specification. When utilized, the following shall apply:
a. All pipes and lines shall be not less than 36 inches below the pavement surface, unless due to gravity flow they must be at a lesser depth to connect to existing lines that are less than 36 inches below pavement. In such cases, lines shall be no higher than the existing lines. Lines located in solid rock, as defined in SCC 12.05.040, shall be not less than 24 inches below the pavement surface, unless due to gravity flow they must be at a lesser depth to connect to existing lines that are less than 24 inches below pavement. In such cases, lines shall be no higher than the existing lines;
b. Compacted select granular material, or crushed aggregate base of three-fourths inch maximum size, shall be used for bedding and shading. The city engineer may authorize the use of utility company bedding specifications, if those specifications are superior to the ones listed herein for bedding purposes;
c. Bedding material shall be placed in horizontal lifts, with thicknesses consistent with the capability of the compaction equipment utilized, but no lift shall be greater than eight inches;
d. Nonshrink backfill shall be placed to the bottom of pavement subgrade. For nonpaved sections, backfill shall be placed to within six inches of finished grade;
e. For nonpaved sections, six inches of ABC shall be placed over the nonshrink backfill and shall meet the compaction methods and relative density requirements of subsection (F) of this section. Native material may be used in place of ABC between the top back of the ditch and the right-of-way boundary;
f. Pavement subgrade thickness shall match existing subgrade thickness but shall not be less than six inches thick;
g. For trenches not parallel to the roadway centerline, T-top trenches shall be constructed in accordance with MAG Standard Detail No. 200, subject to new pavement patching requirements. The edge of the existing pavement shall be beveled 45 degrees toward the trench for a T-Top pavement;
h. Asphalt concrete shall match existing pavement thickness but shall be not less than four inches thick. For local streets, the city engineer may allow three inches of replacement asphalt where appropriate.
2. Specifications for Earth Backfill and Compaction. Specifications for earth backfill and compaction which follow may be utilized for all nonpaved rights-of-way and for trenches using earth backfill. City of Sedona standard detail “Trench Detail” shall be part of this specification. When utilized, the following shall apply:
a. All pipes and lines shall be located pursuant to subsection (E)(1)(a) of this section;
b. Compacted granular material, or crushed aggregate base of three-fourths inch maximum size, may be used for bedding and shall provide not less than six inches of cover between the top of the pipe and the compacted native material backfill. The city engineer may authorize the use of utility company bedding specifications, if those specifications are superior to the ones listed herein for bedding purposes;
c. Material shall be placed in horizontal lifts, with thicknesses consistent with the capability of the compaction equipment utilized, but no lift shall be greater than eight inches;
d. Compaction methods and relative density shall be in accordance with subsection (F) of this section. In addition, the following specifications shall apply:
i. Backfill materials shall be brought to a uniform moisture content within three percent of optimum moisture;
ii. Materials shall be compacted to not less than 95 percent of the maximum density, utilizing the rock correction factor as set forth in MAG Standard Detail No. 190;
e. Compacted native material of four-inch maximum dimension may be used as backfill, provided either:
i. The depth shall be not less than six inches below finished grade for nonpaved surfaces; or
ii. The depth shall be not less than 12 inches below the bottom of pavement subgrade for paved surfaces;
f. Compacted native material of three-inch maximum dimension may be used as backfill, provided the depth shall be not less than 12 inches below the bottom of pavement subgrade for paved surfaces;
g. For nonpaved sections, six inches of ABC shall be placed over the earth backfill and shall be compacted in accordance with MAG Sections 211.3 and 601. Native material may be used in place of ABC between the top back of the ditch and the right-of-way boundary;
h. Pavement subgrade thickness shall match existing subgrade thickness but shall be not less than six inches thick;
i. For trenches not parallel to the roadway centerline, T-top trenches shall be constructed in accordance with MAG Standard Detail No. 200;
j. Asphalt concrete shall match existing pavement thickness but shall be not less than four inches thick. For local streets, the city engineer may allow two inches of replacement asphalt where appropriate;
k. Compaction tests shall be required under all paved surfaces.
F. Relative Compaction. Compaction shall be in accordance with MAG Section 301.3, and with the relative density specification of 95 percent for the following:
1. Major streets;
2. Other streets and traffic ways, including parking lots, access drives and paved bike paths;
3. Curbs, gutters, sidewalks and pedestrian walks;
4. All road shoulders and ditches;
5. Areas outside of the traveled way where vegetative landscaping will be completed immediately following work in the right-of-way shall be compacted to 80 percent relative density.
G. Untreated Base Material. All untreated base material shall be in accordance with specifications in MAG Section 702.2.
H. Weather and Moisture Condition Limitations for Asphaltic Concrete.
1. Asphalt concrete shall be deposited only when the subgrade surface is dry, and when the ambient temperature in the shade is 60 degrees Fahrenheit and is rising.
2. Asphalt concrete shall not be deposited when it is foggy, rainy or when the base on which the concrete is to be deposited is in a wet or frozen state. By “wet” is meant in excess of optimum moisture.
I. Tack Coat. All tack coats shall be applied in accordance with specifications in MAG Section 321.4. When applied to vertical surfaces, tack coats shall be applied only after surfaces have been cleaned and loose particles removed in such manner as to ensure full surface coverage.
J. Base Preparation. All base preparation shall be accomplished in accordance with specifications in MAG Section 321.5.1.
1. Leveling operations shall have been completed before the aggregate base course is applied.
2. The base course shall be in reasonably close conformity with lines, grades and dimensions shown on the plans.
K. Asphalt Base and Surface Course. Asphalt base and surface courses shall be spread and finished in accordance with specifications in MAG Section 321.5.4, with the following exceptions:
1. Use of self-propelled mechanical spreading and finishing equipment is not required unless specified by the city engineer;
2. A smooth steel wheel roller is required, unless otherwise specified by the city engineer. The permittee is encouraged to utilize walk-behind or riding self-propelled vibratory roller compaction equipment whenever possible. When complete, the pavement surface shall be smooth, dense and of uniform texture and appearance.
L. Pavement to Be Removed. Pavement removal shall be accomplished in accordance with specifications in MAG Section 336.2.2. For the purposes of this chapter, the third and fifth paragraphs of MAG Section 336.2.2 shall be deleted. In lieu of cutting trenches across driveways, curbs and gutters, sidewalks, alley entrances and other types of pavements, the city engineer may require the contractor to tunnel or bore under such structures and pavements. When matching to new pavement, existing asphalt pavement shall be removed only by saw cutting.
M. Concrete Materials. Concrete shall be portland cement concrete in accordance with specifications in MAG Section 725 with the following stipulations:
1. May have air entraining admixture of four percent to six percent by volume, if required by the city engineer;
2. Expansion filler joints shall be in accordance with specifications in MAG Section 729;
3. Class A concrete shall be used for concrete structures, either reinforced or nonreinforced;
4. Concrete for curbs, gutters, concrete pavements, sidewalks, Americans with Disabilities Act (ADA) facilities ramps, and driveways located in the public right-of-way shall be 4,000 psi minimum, fiber reenforced. Sidewalks, driveways, ADA facilities ramps shall be six inches thick minimum;
5. Class C concrete may be used for thrust blocks, encasements, fill or over excavation, and the like;
6. Exposed concrete shall be Sedona Red unless stated otherwise by the city engineer;
7. When feasible Americans with Disabilities Act (ADA) facilities ramps and related gutter pans, and curbs shall be a monolithic pour.
N. Curing. Curing of all concrete shall be in accordance with specifications in MAG Section 505.8.
O. Asphalt Concrete. Asphalt concrete utilized as surfacing shall be in accordance with specifications in MAG Section 710 with the following stipulations:
1. Surfacing shall be hot-plant mixed and delivered from the plant to the side at a temperature not greater than 325 degrees Fahrenheit;
2. Cold mix temporary patches shall be utilized, but only until such time that temperature conditions permit, as set forth in subsection (H) of this section, and hot mix asphalt is available, as defined in subsection (H) of this section, and hot mix asphalt is available, as defined in subsection (H)(3) of this section;
3. Hot mix asphalt shall be placed as soon as temperature conditions and availability allow. For the purpose of this section, “availability” is defined as suitable hot mix asphalt concrete being available within a 40-mile radius and the cumulative hot mix asphalt requirements of any permittee equals being available within a 40-mile radius and the cumulative hot mix asphalt requirements of any permittee equals or exceeds five cubic yards;
4. The gradation requirements of Table 710-2 shall be as shown below:
|
Seive Size (mm) |
Designation (mm) |
||||
|---|---|---|---|---|---|
|
9.5 |
12.5 |
19 |
25 |
37.5 |
|
|
50.0 |
– |
– |
– |
– |
100 |
|
37.5 |
– |
– |
– |
100 |
90 – 100 |
|
25.0 |
– |
– |
100 |
90 – 100 |
<90 |
|
19.0 |
– |
100 |
90 – 100 |
<90 |
– |
|
12.5 |
100 |
90 – 100 |
<90 |
– |
– |
|
9.5 |
90 – 100 |
<90 |
– |
– |
– |
|
4.75 |
<90 |
– |
– |
– |
– |
|
2.36 |
32 – 67 |
28 – 58 |
23 – 49 |
19 – 45 |
15 – 41 |
|
0.075 |
5.0 – 10.0 |
5.0 – 10.0 |
5.0 – 8.0 |
1.0 – 7.0 |
0 – 6.0 |
MAG 710 Table 710-11 requirements are modified to require air voids of 3.0 percent to 5.0 percent with a target of 4.0 percent instead of the 2.8 percent to 6.2 percent as stated. The city retains the right to require removal when air voids exceed 5.0 percent.
P. The tolerance for concrete or other installations shall not apply in the case of facilities required to comply with Americans with Disabilities Act requirements. Such installations shall strictly meet the requirements of the Act and associated regulations. The engineer shall modify the use of details 230 through 250 modification as necessary to comply with Americans with Disabilities Act requirements for the application location or in the alternate prepare a complying design.
Q. Granular Material. Granular material shall be in accordance with specifications in MAG Section 601.4.6.
R. Frames, Covers and Valve Boxes. Adjustments for all frames, covers and valve boxes shall be in accordance with specifications in MAG Section 345. All such devices shall be adjusted to final finish grades without regard for plan notations which may be contrary. Adjusting rings shall not exceed 18 inches in depth without prior approval of the city engineer. Rings may be made of concrete. Adjustment of sewer manholes and cleanouts shall be such that the manhole will not be in a depression relative to adjacent street grades.
S. The use of porous asphalt and concrete shall be allowed subject to the approval of the city engineer regarding both location and mix design.
T. The use of rubberized asphalt as a final course of between 0.15 inch and two inches shall be allowed subject to approval of the city engineer.
U. Forms and Temporary Drains. All form work installed shall be in accordance with specifications in MAG Section 505.3. Temporary drains shall be included in all catch basin forms.
V. Trenches. For pipes or lines with diameters larger than two inches, trench widths shall be in accordance with specifications in city of Sedona standard detail, “Trench Detail.” For pipes or lines with diameters less than two inches, trench widths may be excavated to the minimum width necessary to permit a safe installation.
W. Traffic Control Measures. Traffic control measures shall be in accordance with specifications in MAG Section 401.4 and SCC 12.05.070(C)(8)(a). Devices and measures to adequately control vehicular and pedestrian traffic adjacent to and within the construction area shall be provided and maintained.
X. The requirements of this code and any adopted city of Sedona standard specifications shall have precedence over the provisions of the MAG. [Code 2006 § 7-15-11. Ord. 2008-05, 6-10-2008; Ord. 2008-11, 10-14-2008; amended during 2012 codification].