25-8-4. Blasting standards; formulas and table.

In all blasting operations, except as otherwise provided in this chapter, the maximum peak particle velocity of any component of ground motion recorded on a three-component seismograph (where the components — transverse, vertical, and longitudinal — are arranged mutually perpendicular) shall not exceed two inches per second at the location of any dwelling house, public building, school, church, or commercial or institutional building normally occupied.#

For blast-to-structure distance greater than 300 feet, the standard table for maximum charge per delay shall be generated by the formula:#

1. where W is the weight of explosive in pounds and D is the distance in feet to the nearest dwelling house, public building, school, church, or commercial or institutional building normally occupied.

The following table may be used for determining the weight of explosives to be used with a single delay period:#

1. STANDARD TABLE OF DISTANCE

2. Distance Weight Distance Weight

3. in Feet in Pounds in Feet in Pounds

4. 0-10 1/8 350 49

5. 11-15 1/4 400 64

6. 16-20 1/2 500 100

7. 21-25 3/4 600 144

8. 26-30 1.00 700 196

9. 40 2.25 800 256

10. 50 3.50 900 324

11. 60 4.75 1000 400

12. 70 6.00 1100 484

13. 80 7.25 1200 576

14. 90 8.50 1300 676

15. 100 9.75 1400 784

16. 110 11.0 1500 900

17. 130 13.5 1600 1024

18. 150 16.0 1700 1156

19. 170 18.5 1800 1296

20. 190 21.0 1900 1444

21. 210 23.5 2000 1600

22. 230 26.0 2500 2500

23. 250 28.5 3000 3600

24. 270 31.0 3500 4900

25. 290 33.5 4000 6400

26. 300 34.75 4500 8100

For nontabulated distances of over 300 feet, the following formula shall be used:#