Improvement plans shall be submitted on twenty-four-inch by thirty-six-inch standard plan sheets. Drawings shall become the property of the city and shall have the standard city title block located in the bottom right hand corner. Layout sheets shall be on the plan and on three-line profiles. As-built drawings shall be provided. All plans shall be subject to the approval of the city engineer.
(Prior code § 21-7.1; Ord. 1352 § 1, 1980)
The design and improvement of subdivisions shall be governed by the standard specifications of the city. The subdivider shall have the obligations of a contractor under such standard specifications except those provisions which by their nature could only be applicable to contracts between the city and a contractor for public works.
(Prior code § 21-7.2; Ord. 1352 § 1, 1980)
In addition to the standard specifications, the design and improvement of streets, sanitary sewers, storm drainage, waste systems, utilities and landscaping shall be governed by the provisions of Sections 12.44.050 through 12.44.150, inclusive.
(Prior code § 21-7.3; Ord. 1352 § 1, 1980)
All streets shall, as far as practicable, be in alignment with existing adjacent streets by continuations of the centerlines thereof or by adjustments by curves. Streets shall be in general conformity with the general plan for the most advantageous development of the area adjacent to the subdivision.
(Prior code § 21-7.4; Ord. 1352 § 1, 1980)
Streets shall intersect one another at any angle as near to a right angle as practicable.
(Prior code § 21-7.5; Ord. 1352 § 1, 1980)
Where necessary to provide access to, or permit a satisfactory future subdivision of adjoining land, streets shall extend to the boundary of the subdivision. The resulting deadend streets shall have a temporary turn-around. Control of access across such deadend streets shall be vested in the city by dedication of a one-foot nonaccess strip across the entire right-of-way width. In all other cases a turnaround having a minimum radius of forty feet shall be required.
(Prior code § 21-7.6; Ord. 1352 § 1, 1980)
A. 
Type of Street. Public streets shall be designed based on the standards below, except that an alternative design may be approved as part of a tract or parcel map.
Type
Right-of-Way Width
Curb Width
Traffic Index
Major
96 feet
74 feet
8+
Collector with Bike Lanes
66 feet
48 feet
7
Collector
60 feet
40 feet
6
Minor
50 feet
36 feet
5
Major Industrial Without Parking
60 feet
40 feet
8
Minor Industrial Without Parking
50 feet
36 feet
7
Residential Cul-de-sacs
Radius-50 feet
Radius-40 feet
Industrial Cul-de-sacs
Radius-60 feet
Radius-50 feet
B. 
Determination of Type of Street. Type of street may be determined from the following:
Tributary Dwelling Units
Traffic (Average Daily Traffic)
Type
Up to 200
1,400
Minor
200 to 700
5,000
Collector
In excess of 700
1,500 per hour (directional)
Major
C. 
Pavement Design. The state of California method for flexible pavement design shall be utilized. Aggregate base "R" value shall be a minimum of seventy-eight. Aggregate sub-base "R" value shall be a minimum of fifty. Minimum pavement shall be three inches asphalt concrete over eight inches Class II aggregate base, or full depth asphalt concrete, minimum six inches.
D. 
Street Improvements—Nonindustrial Streets. All nonindustrial streets shall include the following improvements:
1. 
Asphalt concrete paving on a rock base or full depth asphalt concrete;
2. 
Curb and gutter;
3. 
Sidewalk;
4. 
Electroliers;
5. 
Street trees;
6. 
Monuments;
7. 
Street signs;
8. 
Handicap ramps;
9. 
Driveways;
10. 
Storm drainage facilities;
11. 
Sanitary sewer facilities;
12. 
Water facilities;
13. 
Cable television facilities.
E. 
Street Improvements—Industrial Streets. Industrial streets shall have the same improvements as set forth in subsection D, with the exception of sidewalk, handicap ramps and street trees. In addition, industrial streets shall have landscaping.
F. 
Design Speed (Minimum).
1. 
Flatland—(less than five percent grade)—Major and collector streets—thirty-five miles per hour; Others—thirty miles per hour.
2. 
Hillside—(greater than five percent grade)—Major and collector streets—thirty miles per hour; Others—twenty-five miles per hour.
3. 
Since there is a wide variance of terrain within the above grade limits the design speeds are to be construed as minimum and shall be exceeded where practicable.
G. 
Vertical Curves on Centerline.
1. 
The summit and sag shall provide stopping sight distance for the appropriate design speed.
2. 
Reverse vertical curves are permitted.
H. 
Horizontal Curves.
1. 
Minimum curve radius shall be as follows:
a. 
Major—seven hundred feet;
b. 
Collector—four hundred feet;
c. 
Minor—two hundred fifty feet;
d. 
Absolute minimum—one hundred fifty feet.
2. 
Minimum tangents:
a. 
Reverse curves are permitted on minor streets. There shall be a one-hundred foot minimum on all others.
b. 
From the end of curvature to the centerline of intersecting street—one hundred feet.
c. 
Compound curves shall be avoided.
I. 
Intersection Design. Intersections shall be designed with a minimum distance of one hundred fifty feet between intersections. "T" intersections shall be avoided where possible.
J. 
Monumentation. Monumentation shall be located on the centerline or on an offset as permitted by the city engineer. It shall be required at each beginning of curve, end of curve or intersection of streets, and where required to permit sight distance.
K. 
Grades.
1. 
The normal minimum shall be one percent after settlement.
2. 
The absolute maximum for minor streets shall be fifteen percent.
3. 
The absolute maximum for major streets shall be twelve percent.
L. 
Curb Radius. The minimum curb radius shall be twenty feet to the face of the curb.
M. 
Sidewalks.
1. 
Sidewalk, curb and gutter shall be monolithic.
2. 
Transverse grade shall be one-fourth inch per foot.
3. 
Concrete shall be a minimum of twenty-five hundred pounds per square inch.
4. 
Width shall be a minimum of five feet from the face of the curb.
5. 
Sidewalk thickness shall be four inches; residential and commercial driveways shall be six inches.
6. 
Expansion joints or deep score shall be at twenty feet on center and expansion joints with dowels at returns.
7. 
There shall be a four-inch minimum of base rock under the sidewalk and six-inch minimum under the curb and gutter.
N. 
Timing of Construction of Streets. Construction of all public streets within a subdivision shall be completed prior to commencement of construction of any building within such subdivision.
(Prior code § 21-7.7; Ord. 1352 § 1, 1980; Ord. 1946, 2/13/2024)
A. 
Design Criteria for Vitrified Clay Pipe.
1. 
The coefficient of friction "N" shall be 0.013.
2. 
The minimum velocity shall be two feet per second.
3. 
The maximum velocity shall be ten feet per second.
4. 
Flow factors shall be as follows:
Land Use
Peak Design Flow Factor (cubic feet/second/acre)
Single family
0.0065
Multifamily
0.0115
Commercial
0.0065
Light Industrial
0.0080
Heavy Industrial
0.0100
Other
Determined individually
5. 
Design shall include the full peak flow for the contributory area.
B. 
Slopes of Collector Lines.
Size
Minimum slope
4"
2.00%
6"
0.65%
8"
0.44%
10"
0.33%
12"
0.26%
15"
0.19%
18"
0.12%
21"
0.10%
24"
0.08%
27"
0.068%
C. 
Laterals.
1. 
Lateral serving single-family residences shall have a minimum diameter of four inches.
2. 
Laterals serving multifamily residences shall have a minimum diameter of six inches.
3. 
The minimum cover at the property line shall be three and one-half feet.
4. 
Cleanout shall be required at the property line.
D. 
Minimum Size for Mains.
1. 
The minimum size for mains in residential areas shall be six inches.
2. 
The minimum size for mains in commercial and industrial areas shall be eight inches.
E. 
Other Requirements.
1. 
Sewer easements shall be a minimum of ten feet wide.
2. 
Sewers shall be located in the street.
3. 
Manholes shall be spaced not more than three hundred feet apart. They shall be eccentric.
4. 
The minimum cover over a main shall be five feet.
5. 
A minimum clearance of one foot shall be maintained between the sewer and crossing pipes, and fifteen-foot minimum horizontal from water lines.
6. 
A 0.2 foot drop shall be allowed around a ninety degree bend in a manhole.
7. 
Stubs shall be provided for future extensions.
8. 
Direction or size shall be changed only at a manhole.
9. 
The minimum radius of curvature of the centerline of the pipe shall not be less than three hundred feet without approval of the city engineer.
10. 
Flushing inlets are required on all deadend lines, whether in a cul-de-sac or at a deadend street, except where the line is terminated at a manhole. Flushing inlets shall be located not more than one hundred fifty feet from a manhole. Lines shall be constructed through the development to upstream properties and shall include capacity for the upstream area.
11. 
Drop manholes shall be required where sewer lines do not channelize through the bottom of the manhole.
(Prior code § 21-7.8; Ord. 1352 § 1, 1980)
A. 
The rainfall intensity curve shall be based on the city standard rainfall intensity curves.
B. 
The street storm drain system shall be designed to withstand a twenty-five-year storm. Sumps, creeks and open waterways shall be designed to withstand a one-hundred-year storm.
C. 
Culverts and storm drains shall be designed with the hydraulic grade line six inches below the flow line of the curb and appurtenance to avoid serious damage from a fifty-year storm.
D. 
Hydrology:
1. 
For watersheds of less than five hundred acres, the quantity of flow concentrating at the designated point shall be calculated by the modified rational method, taking into consideration topographical, soil and vegetation conditions; existing and probable improvements in watershed; size of watershed and intensity of precipitation.
2. 
Inlet time or the time involved in the transportation of water from the initial point of concentration in the watershed to the design point through the use of gutters, culverts, storm drains and ditches shall be used for the time of concentration (duration of storm) for urban areas.
3. 
The minimum time of concentration to be used is ten minutes.
E. 
Street drainage and storm water inlets:
1. 
Inlets or downdrains, where applicable, shall be spaced and located so as to relieve the street of all storm water generated by a twenty-five-year storm.
2. 
Where paving is used without concrete gutters, water should be taken off the street at intervals no longer than four hundred feet.
3. 
On streets with curb and gutter, the intervals should not exceed eight hundred feet; provided, however, that the maximum width of gutter flow shall not exceed eight feet face of curb.
F. 
The one-hundred-year storm shall be contained within the right-of-way.
G. 
Slopes of storm lines shall be such as to achieve a velocity of two feet per second when flowing half full under gravity flow conditions.
H. 
The runoff method rational formula shall be Q = CIA, where "Q" is the quantity of runoff in cubic feet per second; "C" is the runoff coefficient; "I" is the intensity factor; and "A" is the area in acres.
I. 
Runoff coefficients shall be the following:
1. 
Parks and open areas—0.35;
2. 
Residential areas—0.50;
3. 
Multiple dwelling areas—0.65;
4. 
Commercial and paved areas—0.95.
J. 
Energy grade lines shall be as follows:
1. 
Inlet—maximum shall be one foot below the top of the curb.
2. 
Pipe lines—maximum shall be one foot below ground surface.
K. 
The invert grade of any culvert shall not be less than one-half of one percent. The minimum diameter for culverts shall be fifteen inches. Access structures shall not be placed more than four hundred feet apart on conduits smaller than forty-eight inches in diameter. Access structures shall be placed at all vertical and horizontal angle points.
L. 
Culvert sizes: The Manning Formula shall be used to calculate culvert and storm drain sizes and characteristics. The coefficients of friction to be used are as follows:
1. 
Concrete conduits: spun concrete pipe—N = 0.13; cast-in-place concrete—N = 0.15; corrugated metal pipe—N = 0.24.
2. 
Others: "N" values as approved by the city engineer.
M. 
Design requirements:
1. 
Lining shall be required for all channels other than natural drainage channels for natural channels wherever excavation is necessary to change the alignment, capacity or other characteristics of such channel.
2. 
All line channels shall include a cut-off wall at the beginning and termination of the lining, unless it is contiguous with a lined channel. The cut-off wall shall not be less than two and one-half feet below the invert of the lined channel, and shall extend to a minimum of two and one-half feet outside of the side walls to the top of the lining.
3. 
Additional bank protection of other appurtenances may be required where high velocities, abrupt changes in the direction of flow or other conditions may occur to cause damage to the channel or adjacent property.
4. 
The gradient for a line channel shall not be less than one-half of one percent.
5. 
The side slopes of lined channels shall not be steeper than 1-1/2:1, unless specifically reinforced.
6. 
Where asphaltic concrete is used to line drainage channels, the soil under the channel shall be sterilized prior to construction by a method acceptable to the city engineer.
N. 
Channel sizes: The Manning Formula shall be used to calculate the capacity and characteristics of drainage channels, with the following friction factors to be used:
Type of Section
Manning "N"
Concrete lining
0.014
Asphalt concrete or plant mixed asphalt
0.016
Gunite
0.017
Rip Rap
0.030
Other materials, or a combination of the materials shown above that may be used, should reflect these values.
O. 
Freeboard: The freeboard of any lined or unlined channel should not be less than 0.5 feet.
P. 
Curvature: The following shall be used to determine the minimum centerline radius to be used without superelevation:
Trapezoidal channels—subcritical flow
R = V2
(B + 2KD)
6.4
Rectangular channels—subcritical flow
R =
V2
6.4
R = hydraulic radius
B = bottom width
D = depth of water
V = velocity of water
K = cotangent of bank slope
No curves shall be made in the supercritical area.
Q. 
Storm drain easements shall have a minimum width of fifteen feet. The outside of the pipe shall not be located closer than five feet to the easement line.
R. 
Subdrains shall be located under the gutters on each side of the street if required by the city engineer. Subdrains shall be perforated four inch size, and the crown thereof shall run three feet beneath the top of the curb subdrains shall be bedded in drain rock and connected to storm drains.
S. 
Grate inlets: Grate-type inlets on a continuous grade in excess of three percent cannot be considered as accepting their full capacity of flow and should be designed accordingly. Care should be exercised in placing grates outside of normal pedestrian traffic. The effective area of opening on each grate, regardless of slope, should be considered to be fifty percent of the actual area due to the assumption that the grate will be clogged by debris. Curb openings should be provided rather than additional grates.
T. 
Curb inlets: The local depression in gutter grade at curb inlet locations shall not exceed four inches from the gutterline grade extended. The distance from the top of curb to the invert of the gutter at curb inlet locations shall not exceed ten inches. A minimum transition length from the standards street section to the depressed gutter shall not be shorter than eight feet.
U. 
Concrete pipe: The concrete pipe shall be American Standards for Testing Materials Designation C 76, Class III. The minimum pipe size shall be fifteen inches. The pipe shall be centrifugally cast reinforced concrete bell and spigot or tongue and groove with rubber gasket.
V. 
Minimum cover on storm drains and culverts: The following shall be the minimum cover on storm drains and culverts, as measured from finished stock, unless otherwise stated:
Reinforced concrete pipe
Minimum
(1)
Flexible pavement
24"
(2)
Rigid pavement
18"
Corrugated metal pipe
Minimum
(1)
Flexible pavement
12"
(2)
Rigid pavement
6" below concrete slab minimum
(Prior code § 21-7.9; Ord. 1352 § 1, 1980)
Water mains connecting existing public or private water distribution systems shall be installed to serve each lot in the subdivision. Installation of water mains and all appurtenances thereto shall be installed to grades, location, materials, design and sizes approved by the city engineer for the municipal water system and fire agencies.
(Prior code § 21-7.10; Ord. 1352 § 1, 1980)
A. 
Letters from Pacific Gas and Electric Company and Pacific Telephone Company shall be submitted indicating agreement with the location and size of all easements and that satisfactory provisions, including but not limited to bonds and deposits, have been provided to the respective utility companies.
B. 
All utilities shall be placed prior to the construction of curbs, gutters, sidewalks or paving of the streets. No cutting of the street sections shall be permitted. Exceptions shall be made in case of telephone, gas and electric line services to delayed housing starts. All utilities shall be placed underground.
(Prior code § 21-7.11; Ord. 1352 § 1, 1980)
A. 
Planting shall conform with the landscaping master plan and as approved by the director of community services.
B. 
Irrigation systems shall be provided for all landscaped areas, including medians, common greens, open areas and parks. Such systems shall contain conduit, meters and boxes, bubblers, sprinklers, hose bibs and other appurtenances as required by the director of community services.
(Prior code § 21-7.12; Ord. 1352 § 1, 1980; Ord. 1947, 4/9/2024)
Design and improvement of cable television facilities and street lighting systems shall be as approved by the city engineer. Fire hydrants and fire alarm systems shall be as approved by the fire marshal.
(Prior code § 21-7.13; Ord. 1352 § 1, 1980; Ord. 1947, 4/9/2024)
A. 
Spacing of Poles.
1. 
In General. Poles shall be spaced at intervals not exceeding one hundred fifty feet between poles when the poles are installed on the same side of the street or within medial island.
2. 
Staggered Configuration. Poles shall be spaced at intervals not exceeding three hundred feet between poles on one side of the street, and not exceeding one hundred fifty feet between alternate poles on the opposite side of the street when staggered configuration is used.
3. 
Exceptions. If the city engineer finds that unique circumstances are present, the city engineer may require a different spacing between poles than would otherwise be applicable pursuant to subsections (A)(1) and (A)(2) above.
B. 
Distance from Pole to Curb. Poles shall be located so that the centerline of each pole is not more than two feet from the face of the curb.
C. 
Fixture-Mounting Height.
1. 
Maximum, thirty feet;
2. 
Minimum, sixteen feet.
D. 
Lamp Sizes.
1. 
General. 70-watt high-pressure sodium vapor.
2. 
Exceptions.
a. 
Major streets: 70, 100, 150, or 200-watt high-pressure sodium vapor, as determined by the city engineer.
b. 
Street intersections: 70-watt high-pressure sodium vapor, or as determined by the city engineer.
c. 
Areas susceptible to fog: 100, 150 or 200-watt high-pressure sodium vapor, as determined by the city engineer.
d. 
Exceptional or unusual situations: Where the city engineer finds that exceptional or unusual situations are present, including, but not limited to, the necessity to provide more intensive lighting to promote safe ingress and egress, the city engineer may require 100, 200, or 250-watt high-pressure sodium vapor, as the city engineer may determine.
e. 
Cost-benefit analysis: The city engineer shall only approve or require an exception to the general lamp size requirement after the city engineer shall make a cost-benefit analysis of such exception.
(Prior code § 21-7.15; Ord. 1363 § 1, 1981; Ord. 1947, 4/9/2024)