Division 13-21-002
Addendum to MAG Uniform Standard Details for Public Works Construction
Sections:
13-21-002-0001 Portland Cement Concrete Exposed to Weather
13-21-002-0120.1 MAG Detail Nos. 120-1 and 120-2 – Survey Marker
13-21-002-0202 MAG Detail No. 202 – Alley Details (Paved and Unpaved)
13-21-002-0212 MAG Detail No. 212 – Utility Pothole Repair
13-21-002-0220 MAG Detail No. 220 – Curb and Gutter – Types A, B, C, and D
13-21-002-0230 MAG Detail No. 230 - Sidewalks
13-21-002-0240 MAG Detail No. 240 – Valley Gutter
13-21-002-0250 MAG Detail Nos. 250 and 251 – Driveway Entrances/Return Type Driveways
13-21-002-0380 MAG Detail No. 380 – Thrust Blocks for Water Lines
13-21-002-0390 MAG Detail No. 390 – Curb Stop with Flushing Pipe
13-21-002-0420 MAG Detail No. 420 – Pre-Cast Concrete Sewer Manhole
13-21-002-0421 MAG Detail No. 421 – Offset Manhole for 8" to 30" Pipe
13-21-002-0422 MAG Detail No. 422 – Sewer Manhole and Cover Frame Adjustment
13-21-002-0424 MAG Detail Nos. 424 and 425 – Manhole Frame and Cover
13-21-002-0426 MAG Detail No. 426 – Drop Sewer Connections
13-21-002-0427 MAG Detail No. 427 – Stub-Out and Plugs
13-21-002-0440.1 MAG Detail No. 440-1 – Type "A" Sewer Building Connection
13-21-002-0440.3 MAG Detail No. 440-3 – Type "C" Sewer Building Connection
13-21-002-0441 MAG Detail No. 441 – Sewer Cleanout
13-21-002-0533 MAG Detail Nos. 530-540 – Catch Basin Details
13-21-002-0001 Portland Cement Concrete Exposed to Weather
MAG Uniform Standard Details for Public Works Construction shall be modified as follows:
All Portland cement concrete exposed to weather shall be a minimum of Class A with 5 to 7% air entrainment. This requirement shall apply to all sidewalk, curb and gutter driveways, and adjustment collars (e.g., water valves, manholes, and survey monuments), as well as all other construction items exposed to weather. This change includes, but is not limited to, concrete specified on the following MAG Standard Details: 120-1, 120-2, 200, 202, 203, 206, 206-1, 206-2, 220, 221, 222, 230, 231, 232, 233, 234, 250, 251, 260, 261, 262, 263, 270, 321, 346, 391-1, 391-2, 501-1, 501-2, 501-3, 501-4, 501-5, 502-1, 502-2, 530, 531, 532, 533-1, 533-2, 534-1, 535, 550, and 552.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0120.1 MAG Detail Nos. 120-1 and 120-2 – Survey Marker
Revise to include the following notes to both details:
All survey caps shall be stamped with the registration number of the surveyor responsible for placing the monument.
The top of all survey caps placed in paved areas shall be at least 1/2" below pavement grade.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0202 MAG Detail No. 202 – Alley Details (Paved and Unpaved)
Change the paved alley detail to read: Concrete gutter required where longitudinal grade is less than 0.50% and change the minimum asphalt thickness to 3". (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0212 MAG Detail No. 212 – Utility Pothole Repair
Disallow Type "B" pavement repair. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0220 MAG Detail No. 220 – Curb and Gutter – Types A, B, C, and D
Revise all curb types to show that roadway widths are measured to the back of the curb. Revise the class of concrete from Class B to Class A. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0230 MAG Detail No. 230 – Sidewalks
Change the length of the sidewalk from ten (10) feet to twelve (12) feet on four (4) foot wide S/W between contraction joint.
Change the score mark note to read:
Score mark (1/2 inch minimum depth) every 5 feet for 5 foot S/W and 4 foot S/W. Revise the class of concrete from Class B to Class A.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0240 MAG Detail No. 240 – Valley Gutter
Detail No. 240 shall not be used. Use City of Flagstaff Detail No. 8-06-010. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0250 MAG Detail Nos. 250 and 251 – Driveway Entrances/Return Type Driveways
Revise to include the following notes:
The revised depth of concrete for residential driveways shall be 6" minimum.
Class of concrete on all driveways shall be Class A.
The radius on Detail 251 shall be 5 feet or designed to complement the adjoining parkway and sidewalk.
Revise Note No. 5 by deleting "or score mark."
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0380 MAG Detail No. 380 – Thrust Blocks for Water Lines
Replace the table with the following table:
|
TYPE OF FITTING |
Pipe Size (Inches) |
MINIMUM THRUST BLOCK BEARING AREA (SQ. FT.) REQUIRED (Y x W) |
||||
|---|---|---|---|---|---|---|
|
|
|
SOFT CLAY |
SAND |
SAND AND GRAVEL |
SAND AND GRAVEL WITH CLAY |
ROCK |
|
TEES AND DEAD ENDS |
8 |
32 |
16 |
11 |
8 |
4 |
|
|
10 |
48 |
24 |
16 |
12 |
6 |
|
|
12 |
68 |
34 |
23 |
17 |
9 |
|
|
16 |
119 |
59 |
40 |
30 |
15 |
|
90° BENDS |
8 |
45 |
23 |
15 |
11 |
6 |
|
|
10 |
68 |
34 |
23 |
17 |
9 |
|
|
12 |
97 |
48 |
32 |
24 |
12 |
|
|
16 |
168 |
84 |
56 |
42 |
21 |
|
45° BENDS |
8 |
25 |
12 |
8 |
6 |
3 |
|
|
10 |
37 |
19 |
12 |
9 |
5 |
|
|
12 |
52 |
26 |
17 |
13 |
7 |
|
|
16 |
91 |
45 |
30 |
23 |
11 |
|
22 1/2° BENDS |
8 |
13 |
6 |
4 |
3 |
2 |
|
|
10 |
19 |
9 |
6 |
5 |
2 |
|
|
12 |
27 |
13 |
9 |
7 |
3 |
|
|
16 |
46 |
23 |
15 |
12 |
6 |
NOTES:
1. THE BEARING AREAS ARE BASED UPON A TEST PRESSURE OF 200 PSI WITH A FACTOR OF SAFETY OF 1.25 = 250 PSI AND SOIL BEARING CAPACITIES OF SOFT CLAY (500 PSF), SAND (1,000 PSF), SAND AND GRAVEL (1,500 PSF), SAND AND GRAVEL WITH CLAY (2,000 PSF), AND ROCK (4,000 PSF). ADJUSTMENTS MAY BE MADE BY ENGINEERS WITH SPECIFIC DATA ON SOIL CONDITIONS.
2. AREAS FOR PIPE EQUAL TO AND LARGER THAN 18" IN DIAMETER SHALL BE CALCULATED FOR EACH PROJECT.
3. FORM ALL NONBEARING VERTICAL SURFACES.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0390 MAG Detail No. 390 – Curb Stop with Flushing Pipe
Revise the detail to include the following note:
A 3/16" drain hole shall be drilled in the bottom ell of all flushing pipes.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-02-0420 MAG Detail No. 420 – Pre-Cast Concrete Sewer Manhole
Delete the Note "steps not required in 60" M.H."
Revise to include the following:
Manholes that have either two or more inlets or inlet/outlet pipes ranging between 12" and 18" in diameter shall be constructed using 60" inside diameter manhole material. Manholes having inlet/outlet pipes 24" to 36" in diameter shall be constructed using 72" inside diameter manhole material. Manholes for pipes greater than 36" in diameter shall be specially designed.
Steps shall be installed in 60" manhole in accordance with 48" manhole standard.
Steps in all manholes shall be placed so that climber faces traffic and the steps are on the same side of the manhole the sewer pipe enters or exits the manhole.
For new manholes, the maximum dimension from the top of the lid to the top of the cone shall be 22". The maximum dimension from the top of the lid to the bottom of the flat top shall be 24".
The manhole base of all manholes shall be reinforced with #4 rebar 8" on center both ways and placed 4" above subgrade elevation.
A 1" vertical clearance shall be provided between the top of the sewer pipe and the bottom edge of all manhole barrel sections. A suitable radius shall be provided where the manhole floor joins the vertical edge of the invert channel.
Precast manhole bases may be allowed if sufficient design information is provided to enable a thorough review of the design for a recommendation of approval by the City Engineer.
Manhole bases shall be placed on a minimum 8" aggregate base course compacted to 100%.
See COF Standard Detail 9-02-092 for additional requirements of the manhole base geometry.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-02-0421 MAG Detail No. 421 – Offset Manhole for 8" to 30" Pipe
Remove the Note beginning "1:3 Cement . . .."
Revise to include the following notes:
The manhole base shall be reinforced with #4 rebar 8" on center both ways and placed 4" above subgrade.
Manhole bases shall be placed on a minimum 8" aggregate base course compacted to 100%.
See COF Standard Detail 9-02-092 for additional requirements of the manhole base geometry.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0422 MAG Detail No. 422 – Sewer Manhole and Cover Frame Adjustment
Remove the notes beginning "1:3 Cement . . ." and "M.H. step in 48" . . .."
Revise to include the following notes:
Steps shall be installed in 60" manholes in accordance with 48" manhole standard.
The manhole base shall be reinforced with #4 rebar 8" on center, placed 4" both ways above subgrade.
All manhole frame and cover adjustments shall be made in accordance with City of Flagstaff Detail 9-03-062.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0424 MAG Detail Nos. 424 and 425 – Manhole Frame and Cover
All manhole frames and covers shall be aluminum.
The agency name is not required on manhole covers. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0426 MAG Detail No. 426 – Drop Sewer Connections
Delete all references to "V.C.P." and replace with "P.V.C." or "D.I.P." (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0427 MAG Detail No. 427 – Stub-Out and Plugs
Delete all references to "V.C.P." and replace with "P.V.C." or "D.I.P." (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0440.1 MAG Detail No. 440-1 – Type A Sewer Building Connection
Delete all references to "V.C.P." and replace with "P.V.C." or "D.I.P."
Delete the two (2) unnumbered notes beginning "2"x4" _stake . . ." and replace each with the following note:
Using the appropriate fittings as required (i.e., 45°, 22.5°) extend the service vertically at the property line or back of P.U.E. to within 36" min. to 42" max. of finished grade. Cover the end with a (no-glue) cap and mark with a brick and wire. The brick shall be placed on the surface and connected to the service with 12 ga. (min.) galvanized steel or a 12 ga. (min.) copper wire with green insulation.
Exclude the electronic ball markers. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0440.3 MAG Detail No. 440-3 – Type C Sewer Building Connection
The clean-out assembly shall be located behind the sidewalk and may be located on either side of the property line.
Exclude the electronic ball markers.
Revise two (2) of the notes in profile view as follows:
1. Revise the one (1) way cleanout to read:
Two-way cleanout with single riser.
2. Revise the Number 1 meter box in accordance with Detail 320 to read:
Frame and cover in accordance with Detail 270 (Concrete Required in Paved Areas Only)
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0441 MAG Detail No. 441 – Sewer Cleanout
Delete references to "vitrified clay pipe" ("V.C.P.") and replace with "P.V.C." or "D.I.P."
Revise to include the following note:
Sewer cleanouts shall be used on public sewers only when specifically allowed by the City Engineer.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-21-002-0533 MAG Detail Nos. 530-540 – Catch Basin Details
Clarifications – The dimensions of the angle iron on the frame details are given in order of height, width, and thickness. Clarification is given to insure that the frame height is not manufactured less than the thickness of the grate.
Section C-C of Detail 536-1 as noted below the section applies to Details 531, 532, and 533.
Revise to include the following:
Catch basins shall be placed on a minimum 8" aggregate base course compacted to 100%.
(Ord. 2017-22, Rep&ReEn, 07/05/2017)