16.32.040 General requirements | Atherton Municipal Code

16.32.040 General requirements.

The subdivider shall install improvements in accordance with the general requirements set forth in this chapter provided that the city engineer may require changes in typical sections and details if unusual conditions arise during construction to warrant such change in the interest of the town, such changes to be at the expense of the subdivider.

A. Utilities Constructed Prior to Surfacing Streets. All underground utilities, sanitary sewers and storm drains installed in streets, service roads, or highways shall be constructed prior to the surfacing of such street, service roads, or highways. Service connections for all underground utilities and sanitary sewers shall be placed at such a length as to prevent the necessity for disturbing the street or alley improvements when service connections thereto are made.

1. Pavement design shall be as follows:

a. Structural Design. The structural design of the roadbed includes the determination of the thickness and type of subbase, base and surfacing to be placed over the basement soil according to an accepted method used by the city engineer, who shall specify the structural design for the streets in accordance with their classification;

b. Soil Tests. The subdivider shall, at his expense, make tests of the soil over which the surfacing and base is to be constructed and furnish the test reports to the city engineer for use in determining a preliminary structural design of the roadbed. After rough grading has been completed, the city engineer may require the subdivider to have additional tests performed to determine the final structural design of the roadbed.

a. Street intersections shall be designed to provide reasonable approaches from side streets, and to provide continuous flow of drainage, without overflow from the gutters due to change of direction, warp of street, or gutter grade;

b. Concrete valley gutters shall be provided to carry drainage across intersections whenever underground drainage facilities cannot reasonably be provided. Valley gutters shall not be permitted across major streets.

C. Structures. Structures shall be installed as deemed necessary by the city engineer for drainage, access and/or public safety. Such structures to be placed to grades and to be of a design approved by the city engineer.

D. Retaining Walls. Whenever a retaining wall is required within a public right-of-way, it shall be constructed out of masonry, brick, rock, reinforced concrete, or other similar nondeteriorating materials, and be of a design approved by the city engineer.

E. Sidewalks, Curbs and Gutters. Twenty-four-inch wide flat concrete gutters shall be installed on both sides of streets having grades of up to five percent. Twenty-four-inch wide rolled concrete curbs shall be installed on both sides of streets having grades in excess of five percent. Sidewalks or pedestrian paths shall be installed as required by the city engineer.

F. Sewers. Sanitary sewer facilities connecting with an existing sewer system shall be installed to serve each lot and to grades, location, design, and sizes approved by the city engineer. No septic tanks or cesspools will be permitted. Stormwater sewers shall be installed as required by the city engineer.

G. Water. Water mains and fire hydrants of design, layout and locations approved by the city engineer, fire chief, and utility serving the town, and connecting to the water system serving the town shall be installed.

H. Street Trees. Street trees shall be of a type approved by the planning commission and planted in locations approved by it.

I. Street Signs. Street signs shall be of a type approved by the city engineer and installed in locations approved by him.

J. Underground Utilities. All telephone, electric wires or cables, cable TV or other distribution lines to be constructed in and for the purpose of providing service to any subdivision shall be placed underground. All transformers and electrical equipment used and maintained in such subdivisions in connection with the distribution lines shall be installed in underground vaults.

K. Street Lighting. Adequate street lighting shall be provided and dedicated to the town in all new subdivisions and shall meet the following:

1. Standards. Street lighting shall be accomplished by the installation of metal standards and luminaires of a type and size to meet with the approval of the city engineer;

2. Power. Power to electroliers shall be supplied through one and one-half-inch minimum underground conduit. Overhead wires shall not be permitted;

3. Spacing and Size. Spacing of electroliers and type and size of luminaires shall be as approved by the city engineer.

L. Traffic Control Devices. The subdivider shall furnish and install such traffic control devices within the subdivision as may be recommended by the chief of police, and as specified by the city engineer.

M. Slope Planting and Erosion Control. All exposed slopes resulting from grading operations shall be protected from erosion due to storm water overflow or other causes. Initial protection shall be by seeding with approved plant materials. Permanent protection shall be by planting with shrubs and trees of species approved by the planning commission. (Ord. 441 § 1 (part), 1988)