Article X. SANITARY SEWERS

1.

All subdivisions and developments shall provide for the adequate transfer of sanitary sewerage. Capped sewers will be required where applicable.

2.

Plans shall be prepared on twenty-three (23) inches by thirty-six (36) inches half plan and half profile sheets (such as K & E's No. 48-7004 Plate 1 Federal Aid Sheet or equal).

3.

The following scales shall be used: Plan—One inch equals fifty (50) feet; Profile—One inch equals ten (10) feet (horizontal).

4.

Plans shall show the name of the subdivision or development; name and address of the developer/owner; name and address of the Engineer.

5.

Sanitary sewer(s) shall be designed by a registered engineer in Alabama. The engineer's seal shall be on each sheet.

6.

Show land tie of the sewer centerline to an appropriate section corner on each set of plans.

7.

The plan view and profile view for a particular segment shall be on the same sheet.

8.

Show north arrow.

9.

The section, township, and range in which the sewer is located shall be indicated in title block.

10.

Plans shall indicate bench marks, U.S.G.S. datum.

11.

Show streets, lots, blocks.

12.

Show existing utilities.

13.

Show storm drainage structures/facilities crossing and/or running parallel with the proposed sanitary sewer.

14.

Show all proposed and existing easements. Minimum easement width-Fifteen (15) feet. Easements shall extend ten (10) feet beyond last manhole, if applicable.

15.

Easements shall be shown on record map.

16.

Maximum distance between manholes shall be four hundred (400) feet. Show deflection angles at manholes. Show grades between manholes in percent. Show flowline elevations in and out of manholes, and invert elevations along the sewer at fifty-foot intervals.

17.

Note all drop manholes. Drop manholes with drops equal to or greater than two (2) feet shall be designated as memphis tees. Drop manholes with drops equal to or less than two (2) feet shall have one joint of ductile iron pipe on the upstream side of the manhole.

18.

Ductile iron pipe shall be required at all storm drain crossings, creek or ditch crossings, sewer grades greater than fourteen (14) percent, and at depths greater than fourteen (14) feet and less than four (4) feet. Additionally, ductile iron pipe may be required by field conditions if deemed necessary by the Hoover building official.

19.

Ductile iron pipe shall be required in all fill sections. A note shall be placed on the drawings stating that all fill sections shall be compacted prior to the pipe trench excavations.

20.

Ditch checks may be required on sewer grades greater than fourteen (14) percent.

21.

Capped sewers shall be so noted on each sheet. A four (4) inch drain to the nearest storm sewer or ditch shall be installed near the top of the last manhole in the system. This connection shall be removed after the system is connected to a live sewer system.

22.

As-constructed drawings shall be furnished to the city prior to a certificate of occupancy being issued. In the case of bonded public improvements the bond shall include a sufficient amount to cover the cost of the as-built drawing(s).

23.

Provide an overall plan view of the development if required.

24.

Specific design requirements are as follows:

a.

Single family use/zoning—Seven (7) people per acre, three hundred (300) gallons per person per day, twenty-four-hour day.

b.

Multifamily use/zoning—Eleven (11) units per acre, three (3) people per unit, three hundred (300) gallons per person per day, twenty-four-hour day.

c.

Commercial use/zoning—Twenty (20) people per acre, fifty (50) gallons per person per day, sixteen-hour day.

d.

Sewer lateral flowing two-thirds ( 2/3 ) full at design flow.

e.

Minimum velocity two (2) feet per second.

f.

Minimum sewer lateral size—Eight (8) inches.

g.

Minimum grades for sewer laterals—8 inches—0.4 percent; 10 inches—0.3 percent, 12 inches—0.22 percent.

h.

Sewer pipe material shall be either class 52, minimum, ductile iron; extra strength vitrified clay; or PVC truss pipes. (Ord. No. 89-857, § 1, 1-3-90; Ord. No. 93-1171, § 1, 11-15-93)