City of Farmington, MO Article III Earthwork

Section 426.035 Earthwork General.

[Ord. No. 11-2I 118 §1, 5-12-2016]

Earthwork shall be performed as required for specific types of construction including utilities (water, sanitary sewer and storm sewers), streets, sidewalks, and other public improvements.

Section 426.040 Use of Explosives.

[Ord. No. 11-2I 118 §1, 5-12-2016]

A. When explosives are used in the prosecution of the work, the contractor shall follow Federal, State, County, and municipal laws and regulations pertaining to the use and storage of explosives for rock and earth excavation. All explosives shall be stored and used in a safe manner and in compliance with all existing statutes and ordinances and all places used for such storage shall be marked clearly "DANGEROUS EXPLOSIVES." The contractor must obtain a separate permit from the City of Farmington for each job and obtain a special conditions permit from the City of Farmington if blasting within one hundred fifty (150) feet of a well. To obtain a permit the contractor must submit along with an application for a fire prevention permit a site plan, which shall indicate the blast area, location of the storage magazine, and quantities and type of explosives being used. The contractor shall be responsible for providing a copy of the City permits and conducting pre-blast surveys when blasting within congested areas or within three hundred fifty (350) feet of any structure, well, railway, road, highway, or other installation before any blasting can occur on a project site.

B. The contractor shall take precautions to minimize earth vibrations and air blast effects and shall use blasting mats or other protective means to prevent fragments from being thrown. No fly rock shall leave the immediate area. A minimum of one (1) seismograph shall be used on all blasting areas and the inspector may require more depending on the surrounding area congestion. Seismic readings shall not exceed one (1) inch per second at the closest structure or well. Monthly seismic readings and copies of the blasting log shall be provided to the inspector and Fire Official, unless more frequent readings and logs are requested. Sound levels shall not exceed one hundred forty (140) decibels at the seismic area.

C. Blasting periods shall be limited to normal daylight hours. Except by special agreement with the City Engineer, these hours shall be limited to between 9:00 a.m. and 4:00 p.m. each working day.

The contractor shall as a minimum provide the following warnings before each blast:

1. The blasting contractor or facility operator shall be responsible for ensuring that the blast area is visually inspected and made clear of people and/or animals before each shot.

2. Three (3) five (5) to ten (10) second soundings from a siren, air horn, or other approved warning device, with a minimum sound level of one hundred forty (140) decibels at one hundred (100) feet shall be sounded.

3. WAIT a full thirty (30) seconds.

4. Sound another five (5) to ten (10) second sounding.

5. Immediately following the two (2) five (5) to ten (10) second soundings, give a voice command from an amplified bullhorn or equal stating "detonation to follow."

6. No person shall enter the blast area until such time that the blaster in charge has determined that no danger exists.

7. An "all clear" voice command shall be given after the blast and when the blast area is safe to enter for inspection.

D. The contractor shall save the City and its agents, officers, and employees harmless from any claim arising out of the use of such explosives. Removal of any item or material of any nature by blasting shall be done in such manner at such time as to avoid damage affecting the integrity of the design and to avoid damage to any new or existing structure included in or adjacent to the work. Unless the plans, special provisions, or the City Engineer restricts such operation, it shall be the contractor's responsibility to determine a method of operation to insure the desired results and the integrity of the completed work. Blasting will not be permitted until the contractor has obtained proper insurance (see Sec. F-12b of this Chapter) and has obtained a permit from the City Building Inspector.

E. It shall be the responsibility of the contractor to notify each public utility company, having structures or service in proximity of the site of work, four (4) working days before any blasting can take place. It is the contractor's responsibility to protect all structures from damage or to repair or replace those structures at his own expense.

F. If during the course of the blasting program a complaint is lodged, or a claim for damage stated, a post-blast inspection shall be conducted on the property in question. The post-blast inspector should investigate each complaint or claim thoroughly, and using, where appropriate, the pre-blast inspector's report to compare pre-existing damages with those being claimed. The post-blast inspector should in no way make either comment or commitment to the complainant or claimant. The contractor shall furnish the inspector two (2) copies of the complete investigation and status of the claim within two (2) weeks of being notified of the complaint or claim.

G. No additional payment will be made for blasting or complying with all the blasting laws, regulations, or these requirements.

Section 426.045 Embankment Construction.

[Ord. No. 11-2I 118 §1, 5-12-2016]

All embankments (fill) required for construction of public streets and alleys must be compacted. The method of compaction and densities are as required in the latest revision of the City of Farmington, Standard General Conditions and Technical Specifications for Public Works Construction. All trees, shrubs, and plants designated to remain within the public right-of-way shall be shown and clearly noted on the plans. All other plantings shall be removed from the right-of-way. The plans shall require that the public right-of-way be left in a finished and neat appearing condition.

Section 426.050 Subgrade Compaction.

[Ord. No. 11-2I 118 §1, 5-12-2016]

The plans shall require that the street subgrade for both public and private improvements be compacted as required in the latest revision of the City of Farmington Standard General Conditions and Technical Specifications Public Works Construction. All street sub-grades shall have compacted aggregate (meeting Type 1 or Type 5 Aggregate Base requirements) base in thicknesses as required in Table VII-1. Aggregate should extend one (1) foot outside the limits of the street.