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~-~~-rs~ <br />Erica <br />From: /Sorenson, Allen <br />Sent: Wednesday, January 25, 2006 10:18 PM <br />To: i/`Environment inc@outdrs.net' >rN~ironrnen~'~Tnc, <br />Cc: Crosby, Erica; Mount, Carl; Humphries, Bruce <br />Subject: depth of cover at pipeline x-ings <br />Steve, <br />Given that we don't have a lot of detailed information about the nature of the pipelines at the pit location, it is best to use a <br />conservative depth of cover at equipment crossings. The following citations are for pipeline depth of cover for highway <br />crossings, and show that 55 inches of cover is sufficient. <br />http:/Iwww.trans.gov.ab. ca/Contentldoctype329/production/o ilgas p roced. pdf <br />http:/Iwww.revisor.leg.state.m n.us/slats/1161/06.html <br />The following citation is for 6-inch and larger high pressure pipelines; it is DMG's understanding that the pipelines at the <br />site are 4-inch and are not high pressure, so this standard of 90 inch depth of cover will be conservative. <br />http://www.dot. ca.gov/h q/traffops/developse rv/perm its/pdf/provisions/u ncased_h igh_pressu re. pdf <br />Note that Colorado Oil and Gas Commission rules specify a minimum 36 inch depth of cover for pipelines crossing <br />cropland, and state that "All installed pipelines shall have cover sufficient to protect them from damage." <br />http://oil-gasstate.co.us/orders/orders/ 1 r/98a.html <br />In our discussion today you stated that minimum depth of cover for pipeline crossings will be 92 inches; based on the <br />foregoing citations, DMG can approve a 92 inch minimum depth. <br />-Allen <br />