Investigation of Methodologies to Control Dust On Township Roads. SDAT&T Larry Weiss Ken Skorseth

Transcription

1 Investigation of Methodologies to Control Dust On Township Roads SDAT&T Larry Weiss Ken Skorseth

2 The volume of traffic involved in the oil field in western North Dakota has surpassed the ability of counties to adequately maintain their roads Dust along county roads is having adverse effects on county residents

3 Adverse health effects to humans and animals Damage to vegetation Traffic hazard due to poor visibility Increased road maintenance Increased costs Adverse effects on soil and water quality

4 Mckenzie county has active dust control program on 1400 miles of road Annual budget of $1.3 million Dedicated staff just for dust control Dunn County has hired an out of state firm to manage dust on 1200 miles of road Provide dust control for ¼ mile around residence with complaint

5 The Silver Bullet Counties are looking for should: 1. Be easy to handle and apply 2. Provide control for a year 3. Allow the road to be maintained 4. Be cost effective preferably inexpensive 5. Safe for traffic and the environment

6 Water Magnesium chloride Calcium chloride Soil stabilizers Synthetic polymers Enzymes Petroleum emulsions

7 Bio based oils Lignin sulfonate Tall oil pitch Oilfield brine Crude oil Aggregate modification

8 Reviewed available technologies Selected technologies for further evaluation Identified road test segments Applied 9 dust control products Dunn County 11 th Street SW Mckenzie County 154 th Ave

9 Magnesium Chloride Calcium Chloride Durablend calcium chloride with polymers WISP synthetic organic oil

10 Rhino Snot acrylic copolymer Coherex petroleum emulsion Durabond lignin with additives Oil field brine Native clay

11 Good gravel is scarce 3 Mckenzie and one Dunn aggregate had no P.I. Scoria creates significant dust Magnesium chloride is chemical of choice

12 Counties should include gradation and P.I. specifications when bidding aggregate Scoria should be used only on low traffic volume roads such as drilling pads and site access roads To be effective, dust control products need to penetrate the road surface or be mixed in

13 DUST CONTROL INFORMATION PRODUCT APPROXIMATE COST CONTACT Permazyme $12,000-$16,000/mile Williams or Bowman County Base One $0.28-$0.55/sq yd/inch of depth Dunn, Golden Valley, Billings, Stark, or Bowman County Corn Oil Acrylic Resins $0.14-$0.15/sq ft, $16,000/mile Dunn County Calcium Chloride Magnesium Chloride $455/ton, lb/sq yd; $1.26/gallon Richland County, MT; McKenzie County $8,000/mile (1st trmt); $4,900/mile (addl trmt) McKenzie, Dunn, or Burleigh County Oil Field Salt Brine Product is free, $135-$500/hr to apply Dunn or Bowman County $60,000-$250,000/mile (depending on Cement depth) Bowman County, Richland County, MT Stabilock $15,000/mile Bowman County (Products being tested in North Dakota oil field high traffic areas)

14 Magnesium Chloride: This is probably the most widely used product and it does reduce the amount of dust, however, the dry conditions this summer reduced its effectiveness. Calcium Chloride: Similar to magnesium chloride, this product does reduce the amount of dust, but was affected by the dry conditions. This product is more expensive than magnesium chloride. Oil Field Brine: Water produced from an oil well in Dunn County. This product was free, except for the delivery and application costs, and consisted of about 20% salt primarily sodium chloride. This product did provide dust control similar to the other chloride products. Crude Oil: Unprocessed crude oil with a pour point of about 70 degrees. This product did not provide significant dust control.

15 Native Clay: This material was used to increase the Plasticity Index (PI) of the McKenzie County aggregate. This material improved the overall road stability and improved dust control, especially when treated with magnesium chloride. The McKenzie County aggregate did not have any PI while the Dunn County aggregate had a good PI. Past County experience with the chlorides indicates that several applications may be needed initially to provide satisfactory dust control. Application frequency can be reduced after three to four applications. Under the traffic conditions in western North Dakota, any dust control product must penetrate the road surface or be mixed into the road.

16 SD & WY Experience

17

18 ADT exceeds 1000 on Spearfish end in summer.

19 Eight inches of gravel originally placed after aggressive reshape in Liquid MgCl2 treatment applied annually thereafter. Four inches of gravel replaced after 12 years.

20

21

22

23

24

25 Laramie Street

26 Laramie Street

27 Stabilization program began nearly 20 yrs ago. Initial treatment rate is.5 gal per sq yd of liquid MgCl² applied after prewetting surface. Annual retreatment is.3 gal generally applied in early June and a light shot of.1 gal in mid-sept. The product is diluted 1:1 with water to get better penetration into the surface. Keys are getting right gravel in place and doing good preparation, especially loosening surface prior to retreatment and getting uniform crown. Summary of comments provided to Ken Skorseth from Harold Colby, Street Division Manager, Laramie Public Works Dept.

28 Meade County, SD 2011 Project

29

30

31

32

33

34

35

36

37 No blade maintenance was done between construction in summer of 2011 and surface retreatment in summer of 2012!

38 Phone call from citizen If you had enough money to pave this road, why didn t you save enough to put striping on it

39

40 You have just seen a glimpse into the future in managing a relatively high volume local road carrying significant truck traffic without the funds to construct thick base and pavement. Ken Skorseth, SDLTAP We call it Poor Man s Pavement Ken McGirr, Meade Co Hwy Supt