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111 Illllllllllll III a ~ <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Natural Resources <br />1 ] 1 J Sherman 51., Room 215 y <br /> <br />Denver. Culomrlo 80203 l <br />~ <br /> <br />Phone: (3071 B66-3567 I <br />I <br />FAx: 13071 872-8106 <br /> DEPARTMENT OF <br /> NATURAL <br />October 28, 1997 RESOURCES <br /> RoY Romer <br /> Goverrror <br />Norman and Lisa Bowie lames 5. Lochhead <br /> <br />1077 Fremont Avenue E~autrve Director <br />Michael B. long <br />Penrose, CO 81240 Division Director <br />RE: Complaint Letter- Blasting Damage, Portland Limestone Quarry, Permit No. M-77-344 <br />Dear Mr, and Mrs. Bowie: <br />Thank you for your letter regarding possible damage to your home by blasting at Holnam, Ines. Portland Limestone <br />Quarry. <br />The Division will conduct a review of blasting techniques used at the quarry for the dates mentioned in your letter. We are <br />requesting records of their blasting -number of blast holes, amount and type of charge, time delays and seismic <br />information. We should be able to determine whether it is possible for ground motion or av blast to reach your home with <br />enough energy to be of concern. <br />We are suggesting that Holnam, Inc. contals you and request to conduct apre-blazt survey of your home and to obtain <br />permission to place seismic monitors on your property. We suggest that you allow these activities, if requested by the <br />company. A pre-blast survey would be for the purpose of recording the present condition of your foundation, walls, etc. to <br />document whether or not blazting may be related to the problem of cracking. <br />The Division suggests that you have a structural engineer look at your home. He may be able to determine if another <br />problem such az settling of fill material under or against your foundation is causing the problems you are experiencing. <br />This is a somewhat common problem Cor the First few years after homes are built, if fill material is not properly compacted. <br />You may also want to have that individual determine if your home is built on expansive soils which may be causing your <br />foundation to move. <br />We will inform you of the results of our review. <br />Please call if you have questions. <br />Sincerely, <br />~~-~~0~~ ~;e~~r"f~ <br />Larry D. ehler <br />Environmental Protection Specialist <br />cc: Jim C. Stevens, DMG <br />Ray Patterson, Holnam, Inc. <br />M10SSPMAi~tEMA771aaC1..1P.LD0 <br />