01-1 Confined Blasting

01-2 Minimize Dust re-entrainment

01-3 Use water injection into the abrasive stream in amounts sufficient to control the plume (to the Control Officer’s satisfaction).

01-4 Use abrasives less than 1% passing a US #70 sieve.

• Conduct blasting within an enclosed structure.
• Position object at least 24 inches above the ground.
• Use barriers to shield three sides to minimize dust carry out.
• Pre-wet surfaces where support equipment is operated and blasting will be conducted.
• Clean particulate matter from surrounding area after completion and apply dust palliative.

02-1 Stabilize backfill material when not actively
handling;

02-2 Stabilize backfill material during handling;

02-3 Stabilize soil at completion of activity.

• Apply water in sufficient quantity to
  prevent generation of dust plumes.
• Mix backfill soil with water prior to
  moving.
• Dedicate water truck or high capacity hose to backfilling equipment.
  
• Minimize drop height from loader
  bucket.
• Empty loader bucket slowly so that no dust plumes are generated.

03-1 Maintain stability of soil through pre-watering of
site prior to clearing and grubbing;

03-2 Stabilize soil during clearing and grubbing
activities;

03-3 Stabilize soil immediately after clearing and grubbing activities.

• Maintain live perennial vegetation and desert pavement where possible.
• Apply water in sufficient quantity to
  prevent generation of dust plumes.
• Fence off stabilized areas to prevent unauthorized traffic from disturbing the crust on stabilized areas.
• Watering during clearing and grubbing activity to maintain stability.
• Water repeatedly as needed to maintain stability.
• Use water and/or stabilizers to from a crust in areas not subject to repeated disturbances. A wetting agent may enhance application.

04-1 Use water spray to clear forms;

04-2 Use sweeping and water spray to clear forms;

04-3 Use vacuum system to clear forms.

• Use of high pressure air to clear forms may cause exceedence of opacity/plume length restrictions.

04-1 Stabilize surface soils prior to operation of
support equipment;

04-2 Stabilize material after crushing.

• Follow permit conditions for crushing equipment.
• Pre-water material prior to loading into crusher.
• Monitor crusher emissions opacity.
• Apply water to crushed material to
  prevent dust plumes.

05-1 Pre-water soils prior to cut and fill activities; and,

05-2 Stabilize soil during and after cut and fill activities.

• For large sites, pre-water with sprinklers or water trucks and allow time for penetration.
• Use water trucks/pulls to water soils to depth of cut prior to subsequent cuts.

06-1 Stabilize wind erodible surfaces to prevent dust.

06-2 Stabilize surface soil where support equipment and vehicles will operate.

06-3 Stabilize loose soil and demolition debris.

• Apply water in sufficient quantities to prevent the generation of visible dust plumes.
• Water repeatedly as needed to maintain stability.

07-1 Stabilize disturbed soil throughout the construction site.

07-2 Stabilize disturbed soil by applying water or a stabilizing agent.

07-3 Use Vegetative cover to stabilize disturbed soil.

• Fence off stabilized areas to prevent unauthorized traffic from disturbing the crust on stabilized areas.
• If interior block walls are planned, install as early as possible
• Use watering or palliatives to maintain a visible crust, or a minimum threshold friction velocity (TFV) of 100 cm/second.
• Cover with greater than 10 % non-erodible elements.
• Flat Vegetative Cover : Maintain a flat vegetative cover (i.e., attached [rooted] vegetation or unattached vegetative debris lying on the surface with a predominant horizontal orientation that is not subject to movement by wind) that is equal to 50 % cover.
• Standing Vegetative Cover : Maintain a standing vegetative cover (i.e., vegetation that is attached [rooted] with predominant vertical orientation) that is:
• a) equal to or greater than 30 %, or
• b) greater than 10 % provided that the threshold friction velocity (TFV) is greater than 43 cm/second.
• Apply water or a stabilizing agent in sufficient quantities to prevent the generation of visible dust plumes
• Grade entire project and apply stabilizers when construction phase will not immediately begin; usually more than 60 days.

08-1 Pre-apply water to depth of proposed cuts; and,

08-2 Re-apply water as necessary to maintain soils in a damp condition; and,

08-3 Stabilize soils once earth-moving activities are complete.

• Grade each project phase separately, timed to coincide with construction phase
• Water trucks, hoses, sprinklers to increase moisture content thereby increasing the stability of soil prior to soil moving operations.
• Fence off stabilized areas to prevent unauthorized traffic from disturbing the crust on stabilized areas.
• Apply water or a stabilizing agent in sufficient quantities to prevent the generation of visible dust plumes

09-1 Grade in smaller segments to minimize total area exposed at any one time.

09-2 Grade entire project and apply stabilizers when construction phase will not immediately begin; usually more than 60 days.

09-3 Water trucks, hoses, sprinklers to increase moisture content thereby increasing the stability of soil prior to soil moving operations.

09-4 Watering during grading or excavating activity to maintain stability. Operate a water truck in tandem with a bulldozer, watering ahead of the blade.

• Use water trucks/pulls to water soils to depth of cut prior to subsequent cuts.
• Water should penetrate to depth of cut. A wet surface is not good enough. Water should penetrate at least ½ inch.
• Fence off stabilized areas to prevent unauthorized traffic from disturbing the crust on stabilized areas.
• Water repeatedly as needed to maintain stability.
• Use water and/or stabilizers to from a crust in areas not subject to repeated disturbances. A wetting agent may enhance application.
• Follow vendor recommendations for stabilizer use.

10-1 Stabilize material while loading to prevent fugitive dust emissions.

10-2 Maintain at least six inches of freeboard on haul vehicles.

10-3 Limit vehicular speeds to 15 miles per hour while traveling on-site.

10-4 Stabilize material while transporting to prevent fugitive dust emissions.

10-5 Stabilize material while unloading to prevent fugitive dust emissions.

• Use tarps or other suitable enclosures on haul trucks.
  
• Check belly-dump truck seals regularly and remove any trapped rocks to prevent spillage.
  
• Comply with track-out
  prevention/mitigation requirements.
• Provide water while loading and unloading to prevent visible dust plumes.

• Apply water to materials to stabilize.
• Maintain materials in a crusted condition.
• Maintain effective cover over materials.
• Stabilize sloping surfaces using soil binders until vegetation or ground cover can effectively stabilize the slopes.
• Prompt re-vegetation—hydro seeding.

11-1Apply water to unpaved shoulders prior to clearing.

11-2Apply chemical dust suppressants and/or washed gravel to maintain a stabilized surface after completing road shoulder maintenance.

• Installation of curbing and/or paving of road shoulders can reduce recurring maintenance costs.
• Use of chemical dust suppressants can inhibit vegetation growth and reduce future road shoulder maintenance costs.

12-1 Pre-water material prior to screening; and,

12-2 Limit fugitive dust emissions to opacity and plume length standards; and,

12-3 Stabilize material immediately after screening.

• Dedicate water truck or high capacity hose to screening operation.
• Drop material through the screen slowly and minimize drop height.
• Install wind barrier with a porosity of no less than 50% upwind of screen to the height of the drop point.
• Apply palliative to stabilize material and surrounding area after screening.

13-1 Stabilize staging areas during use; and,

13-2 Stabilize staging area soils at project completion.

• Limit size of staging area.
• Limit vehicle speeds to 15 miles per hour.
• Limit number and size of staging area entrances/exists.

14-1 Stabilize stockpiled materials.

14-2 Install and maintain wind barriers with no less than 50 percent porosity on three sides of the pile, such that the barrier is equal to or greater than the pile height.

14-3 Stockpiles within 100 yards of occupied buildings
must not be greater than eight feet in height; or

14-4 Stockpiles greater than eight feet in height and not covered must have a road bladed to the top to allow water truck access or must have an operational water irrigation system that is capable of complete stockpile coverage.

• Apply water and surfactant when stacking, loading and screening. Pre-wet until moisture content is at least 70% of the “optimum moisture content” (for compacting).
• Apply water and surfactant for optimum moisture content when piling.
• Silo enclosure for long term storage.
• Three sided barrier with the same height as storage pile.
• Add or remove material from the downwind portion of the storage pile.
• Maintain storage piles to avoid steep sides or faces.
• Temporary covering with tarp, plastic sheeting or other materials.
• Load out from the downwind side of pile.
• Stabilize surface after completing stockpile related activities, especially when there is infrequent use of stockpile.
• Minimize steep sides and faces as much as possible.

15-1 Stabilize all off-road traffic and parking areas.

15-2 Ensure that on-site vehicular traffic does not exceed 15 miles per hour.

15-3 Stabilize all haul routes.

15-4 Direct construction traffic over established haul routes.

15-5 Ensure that Track-out Control are implemented

• Apply gravel/paving to all haul routes as soon as possible to all future roadway areas.
• Install a gravel pad 30 feet wide by 50 feet long. One to three inch diameter washed, well graded gravel or crushed rock, 6 inches deep, can be used to remove mud and dirt from vehicle tires. Clean regularly to maintain effectiveness.
  
• Build a “Grizzly” at the exit. A series of pipes, rails, or grates can dislodge mud, dirt, and debris as the tires bounce as the vehicle leaves the site.
• Use barriers and restrict traffic to track-out control devices to ensure vehicles are only used on established parking areas/haul
  routes.
• Wheel washers (Water sprays or hoses to wash mud or dirt off tires before entering the street).
• Do not over water to the point of making mud, which is more easily picked up and more difficult to remove from tires.
• Cleaning mud coated on road surface may require washing with water sprays to adequately eliminate dust generation.

16-1 Stabilize surface soils where trencher or excavator and support equipment will operate.

16-2 Stabilize soils at the completion of trenching
activities.

• Pre-watering of soils prior to trenching is an effective preventive measure. For deep trenching activities, pre-trench to 18 inches soak soils via the pre-trench and resuming trenching.
• Washing mud and soils from equipment at the conclusion of trenching activities can prevent crusting and drying of soil on equipment.

17-1 Pre-water material prior to loading.

17-2 Ensure that freeboard does not exceed six inches.

• Empty loader bucket such that no visible dust plumes are created.
• Ensure that the loader bucket is close to the truck to minimize drop height while loading.

18-1 Apply sufficient water immediately prior to
conducting turf vacuuming activities to meet opacity and plume length standards.

18-2 Cover haul vehicles prior to exiting the site.

• Haul waste material immediately off-site.

19-1 Stabilize soils to meet the applicable performance standards.

19-2 Limit vehicular travel to established unpaved roads (haul routes) and unpaved parking lots.

19-3 Prevent visible emissions and track-out onto paved roads.

• Restricting vehicular access to established unpaved travel paths and parking lots can reduce stabilization requirements.
• Apply 4 inches of gravel where watering, stabilization or paving is not feasible. A 50 foot length is recommended.
• Apply water to materials to stabilize. Water as frequency as needed to suppress dust depending on soil type, weather conditions, and vehicular use.
• Use wetting agent for dry dusty surfaced to enhance surface penetration.
• Apply calcium or magnesium chloride or other surface stabilizer suitable for traffic to form hard surface barrier; reapply and water as needed. See common palliative list in this section.
• Watering during grading or excavating activity to maintain stability.
• Complete final paving a soon as possible.
• Conduct street cleaning and sweeping to remove material accumulation.
• Follow vendor recommendations for stabilizer use.
• Unpaved Parking Lot/Staging areas must limit silt content of surface not greater than 0.33 oz/ft 2 or shall not exceed 8%.
• Unpaved Haul/Access road must limit silt content to 0.33 oz/ft 2, shall not exceed 6 %.

20-1 Monitor current weather conditions and weather predictions from the AQMD’s toll free wind forecast system (800-536-WIND) and/or the National Weather Service.

20-2 Cease all construction activities if fugitive dust emissions exceed 20 percent opacity or if 100 foot visible plume restriction cannot be met. Control measures (e.g., water trucks/pulls) must continue to operate unless operation of such equipment cannot reduce fugitive dust emissions or if visibility is limited to such an extent that it is hazardous to continue operating such equipment.

• Documentation of weather (e.g., wind) conditions can facilitate compliance determinations when using an affirmable defense to dust control ordinance and Fugitive Dust Control Plan requirements.
• Keep track of weather forecasts and check the sky for pending winds. Some soils with proper pre-wetting can be managed in high winds, whereas light fluffy soils could be a dust problem even at low wind speeds.