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A. Generally. The subdivider shall provide a sanitary sewer system in accordance with the following criteria:
1. The system shall be of a size not less than that which is specified by the sanitary sewer master plan on file with the public works director.
2. The system shall have adequate capacity to serve the subdivision and the full service area tributary thereto in accordance with the city design standards. The tributary area shall be determined by the public works director.
3. When required, the subdivider shall provide a pumping plant to convey the effluent to an existing system.
The director will determine the point of connection to the existing sewer system. The subdivider’s engineer shall prepare a design analysis of the proposed sanitary sewer system in accordance with the sanitary sewer master plan on file with the public works director. When staged construction is proposed, the analysis shall thoroughly cover the design of the entire system.
B. Design Flow. Recommended design criteria for the determination of the sanitary sewer design flow for residential and commercial development are given in Table 5.
The director will determine on all individual basis if industrial waste will be accepted into the city system or if other provision for its on-site disposal will be made.
C. Conduit Design.
1. Type. Sewer conduits shall be extra-strength vitrified clay pipe conforming to ASTM Designation C 200, with plastisol, or equal, compression joints, or polyvinyl chloride (PVC) sewer pipe with a maximum DR of 35, conforming to ASTM Designations D 2784 and D 3034, with flexible elastomeric seals conforming to ASTM Designation D 3212.
In new sewer line construction, wyes to tees for house service connections shall be complete fittings. Saddle type connections will not be permitted.
2. Size. The minimum sanitary sewer size shall be eight (8) inches in diameter except that six (6) inch pipe may be used in the last run in residential areas on cul- de-sacs and in locations where no future extensions of the main are intended.
No sewer pipe shall have a diameter less than that of the pipe immediately upstream from it.
3. Slope. Slope will be controlled by physical conditions and velocity criteria. Abrupt changes in slope are undesirable and should be avoided wherever possible.
4. Velocity. The minimum velocity shall be 1.8 fps when the pipe is flowing full and/or half-full.
5. Head and Head Losses. Sanitary sewers shall be designed to pass the design flow with a free water surface. Proper consideration shall be given to minor head losses.
6. Alignment. Alignment will be straight between manholes with no bends except that curved alignment with a minimum radius of 500 feet may be used in special cases.
7. Location. The location of sanitary sewers relative to roadway centerline shall be in accordance with the improvement standards. Care should be taken that sanitary sewers and other underground facilities do not conflict with each other.
8. Depth. Minimum sewer depth shall be four and one-half (4.5) feet from flowline to finish grade. For unimproved streets where street grades have not been set, the minimum depth shall be five (5) feet from the flowline to existing grade.
D. Manholes.
1. Type. The type of manholes to be utilized shall be as set forth in the improvement standards.
2. Location. Manholes shall be placed:
a. Where two or more sewer mains join;
b. Where the conduit changes in size;
c. At angle points;
d. At points where a change of slope in the conduit occurs.
3. Spacing. Manholes shall be spaced no farther than 350 feet apart.
4. Grade. The crowns of all conduits intersecting at a manhole shall match.
E. Flushing Holes. Flushing holes shall be of the type shown in the improvement standards and shall be placed in accordance with the improvement standards. They shall not be used except in cul-de-sacs or at temporary ends of lines if the end of line does not occur at a manhole. Flushing holes shall be placed no more than 150 feet from a manhole.
F. Laterals.
1. Size. Minimum lateral size for single-family dwellings shall be four (4) inches in diameter. All others will require special design, and design calculations shall be submitted for approval.
2. Slope. Laterals shall have a minimum slope of two (2) percent.
3. Location. Laterals shall be provided for every lot and shall generally be centered on each lot. They shall be at right angles or radial to the sanitary sewer main.
Laterals shall be installed to a point at least five (5) feet into the property prior to other utility installation, pressure testing and subsequent connection to the effluent source.
4. Depth. Laterals shall have a three (3) foot minimum cover at the back of the sidewalk. Where the sewer main is ten (10) feet or greater in depth, deep sewer risers shall be installed.
G. Temporary Pumping Plants. The subdivider’s engineer shall design any needed pumping plants subject to the approval of the director. Each design will be considered on an individual basis.
(Res. No. 9 77-78 (part), Res. No. 87 86-87 §1, Res. No. 86 87-88, Res. No. 113-07, Res. No. 19-13)
A. Size and Type. The size and type of water main pipe shall be determined by California Water Service Company. The sizing shall be based upon the company’s distribution needs and fire flow requirements determined by the city fire department. The type of pipe will be determined by the California Water Service Company.
B. Installation. Installation of water main and services shall be the responsibility of the subdivider. Trench backfill and surfacing shall be in accordance with the city of Chico improvement standards.
C. Certification. Prior to filing the final map, the subdivider shall provide the city with the certification from California Water Service Company. This certification shall state that the company will provide water service to the subdivision and that the subdivider has met all of the company’s conditions necessary to provide water service.
(Res. No. 9 77-78 (part))
A. Installation; Location; Number. Installation of fire hydrants shall be the responsibility of the subdivider.
The number and location of fire hydrants connected to a water supply capable of delivering the required fire flow shall be provided on the public right-of-way and/or on the site to be protected as determined by the fire chief. Standard hydrant spacing shall be at 300-foot intervals in all areas except areas containing only single-story single-family or duplex dwellings, in which case standard hydrant spacing shall be at 500-foot intervals.
When the fire chief determines that it would not be adverse to the city’s fire protection capabilities, the fire chief shall have the authority to make minor modifications to the hydrant placement distances set forth above. In no case shall fire hydrants be spaced closer than 300-foot intervals.
B. Hydrant Type. Approved fire hydrant models are the Long Beach Iron Works Model 614 and 615 or Clow Model 950 or 960. Other hydrant models may be utilized upon approval of the fire chief.
C. Method of Installation. The subdivider shall make all arrangements for the installation and inspection of all fire hydrants with the California Water Service Company.
(Res. No. 9 77-78 (part), Res. No. 149 78-79 §1, Res. No. 196 80-81 §1, Res. No. 59 90-91 §11, Res. No. 02 03-04)
A. Location and Capacity. All utilities (gas, water, electric, telephone and cable TV) shall be installed and placed underground. Their location shall be subject to the requirements of the improvement standards, the recommendation of the utility company and the approval of the director.
B. Access. The location of all utilities shall allow satisfactory equipment and personnel access for maintenance and operation.
C. Certification. Prior to filing the final map, the subdivider shall provide the city with a certification from each appropriate utility company. This certification shall state that the company will provide its service to the subdivision and that the subdivider has met all of the company’s conditions necessary to provide the service.
D. Cost. Unless such is required by federal or state law and/or regulation, nothing in this code shall be construed to require a subdivider to absorb the cost of such installation at their sole cost.
(Res. No. 9 77-78 (part), Res. No. 89 87-88, Res. No. 59 90-91 §12, Res. No. 40-18 §1)
A. Street Tree Requirements. Street trees shall be planted as directed by the public works director. In lieu of planting the trees, the subdivider shall deposit with the city a street tree fee. Such fee shall provide the tree purchasing and planting by the city and shall relieve the subdivider of any further street tree obligation.
B. Landscape Requirements. Landscaping may be required by the advisory agency. All such landscaping shall be installed and maintained by the subdivider until the city accepts the subdivision. In addition, the subdivider may be required to provide irrigation facilities for the landscaping.
C. Planting and Installation Guidelines. All street trees and landscaping required within a public right-of-way or public service easement or on other city property shall be planted and installed in compliance with the following guidelines:
1. All trees, shrubs, ground covers, vines and turf shall be of a type approved by the public works director and, to the greatest extent practicable, shall be of a drought- resistant and drought-tolerant type of variety.
2. Irrigation controllers shall be equipped with independent station control, multiple start time and multiple program capabilities.
3. All irrigation systems shall include independent station or “zone” moisture sensors. Plant materials with similar watering requirements shall be irrigated using common controller circuits.
4. Irrigation systems shall be designed to match precipitation rate to evapo- transpiration potential of selected plant materials given soil percolation rates.
5. Whenever possible, irrigation systems shall include drip irrigation, individual adjustable bubblers, weep-tubing, matched precipitation sprinkler heads and other low volume systems.
6. Wind direction and wind speed shall be considered as a design element for the purpose of minimizing overspray and to provide even precipitation distribution.
7. A water audit shall be performed before installing plant material, to ensure equal precipitation rate.
8. Wherever practical, landscape installations shall be performed with minimum soil compaction. All attempts shall be made by the landscape contractor to keep construction equipment and vehicles off the landscape site once final soil tilling and grading is complete.
(Res. No. 9 77-78 (part), Res. No. 102 92-93, Res. No. 19-13)
If the anticipated traffic demand created by the subdivision warrants the installation of traffic signals, the subdivider shall install same.
Determination of the need for traffic signals, and their subsequent design, will be the responsibility of the director. The subdivider shall provide and install these facilities in accordance with requirements of the director.
(Res. No. 9 77-78 (part))
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