Virginia Law

A record of each blast shall be kept. All records including seismograph reports shall be retained at least three years and shall be available for inspection by the Division of Mines and shall contain the data required in DMLR regulations, 4VAC25-130-816.68:

1. Name of the operator conducting the blast;

2. Location, date and time of blast;

3. Name, signature, and certification number of the blaster conducting the blast;

4. Type of material blasted;

5. Sketches of the blast pattern, including number of holes, burden, spacing, decks, and delay interval;

6. Diameter and depth of holes;

7. Types of explosives used;

8. Total weight of explosives used per hole;

9. Maximum weight of explosives detonated in an eight-millisecond period;

10. Initiation system;

11. Identification, direction and distance, in feet, from the nearest blast hole to the nearest dwelling, public building, school, church, community or institutional building outside the mine area, except those structures owned by the operator and not leased to another person, if a written waiver by the lessee is submitted to the division before blasting;

12. Weather conditions including those which may cause adverse blasting effects;

13. Type and length of stemming;

14. Mats or other protections used;

15. Seismographic and airblast records, if required, which shall include:

a. Name of person and firm taking the reading;

b. Name of person and firm analyzing the seismographic record;

c. Vibration or airblast level recorded;

d. Type of instrument, sensitivity, and calibration signal or certification of annual calibration; and

e. Exact location of instrument and the date, time and distance from the blast; and

16. Reasons and conditions for each unscheduled blast.