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Jodi Schreiber <br /> From: Melick, Phil <PMelick@swenergy.com> <br /> Sent: Monday, May 13, 2019 8:26 AM <br /> To: Jodi Schreiber <br /> Subject: RE: Goodrich Pit Blasting Plan <br /> Jodi— <br /> Following up on my earlier email in which I mentioned that we can control ground vibration with blast design, hole <br /> diameter, bench height, pounds per delay, etc.,we can still maintain a relatively high scaled distance at 2000 feet from <br /> the nearest neighboring structure. For example, based on the design specifications listed in your document: <br /> Hole diameter=4.5" <br /> Blasting Agent (ANFO) density= 0.82 g/cc <br /> Bench height= 25' <br /> Stemming height=8' <br /> Pounds ANFO per hole = 97 pounds per hole (round up to 100 to include booster and possible heavier density product) <br /> Distance to nearest structure = 2000' <br /> Scaled distance = Distance/Vmax pounds per delay <br /> Scaled distance = 2000/V100 <br /> Scaled distance = 200 <br /> Ground vibration prediction calculation: V= 160 x (Scaled Distance)` <br /> V= 160x(200) 16 <br /> V= 0.033 inches per second <br /> Widely accepted guidelines for quarry and construction blasting are 2.0 inches per second. As you can see,we would <br /> expect to be well below that limit given the blast design parameters. <br /> I hope this helps...please let me know if you have any questions or need additional information. <br /> Thanks, <br /> Phil Melick <br /> Manager—Quarry &Construction <br /> Southwest Energy, LLC <br /> 2040 West Gardner Lane <br /> Tucson, AZ 85705 <br /> Office—(520) 696-9495 <br /> Cell—(520)429-4553 <br /> From: Jodi Schreiber [mailto:jodi@arycorp.com] <br /> Sent: Wednesday, May 01, 2019 9:26 AM <br /> To: Melick, Phil <br /> Subject: Goodrich Pit Blasting Plan <br /> 1 <br />