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~.. !'MEMBER GSA AIME ~I11-_ AAPG III'lllll'II IIII II~ _ sss Doc Date:12/11/2001 July 29, 2000 Mr. Tom Bird National King Coal 4424 County Road 120 Hesperus, Colorado 81326 Harrv ~.. Sie}pert Consujtant in Appjierl Earth ,Science Highway 145 Dolores Colorado 81323 970.862.4034 C,~~ SUBJECT:CCrawford Residence Pre-Blast Inspection, Hesperus, Colorado, Dear Mr. Bird, A pre-blast inspection was made for the Crawford residence. Mr. and Mrs. Crawford were very helpful in reviewing the eight years it required to construct the house. A six foot center shaft of eight inch reinforced concrete walls provides the internal support for the first and second stories and concrete block for the third level. The construction is unique in housing dominated by balloon type construction. Exposed joists locally cut lumber. Reinforced concrete footings are 24 inches by 18 inches thick. Floor joists are 2 inch by 8 inch local lumber on twenty four inch centers .The walls are log and the house would be best described as a log house. The lower level and second story have a floor plan that is similar to a post 1800 log house. Each room was inspected for cracks, out of alignment walls, water marks, etc. and none were observed with the exception of the concrete basement floor. A crack pattern of cracks 1/16 of an inch or less were observed. The cracks are stable and do not have a vertical offset. Cracks were spanned with a straight edge. Based on my prior experience the cracks formed during the curing process. , The material used for the porch floor has cracked due to weathering. Other wodd used has a few cracks which is normal. In my experience with a similar type construction differential settlement will cause plast- er walls to crack. The construction was generally stone foundations and a center chimney. When concrete floors were added similar many had similiar;crack patterns. occurred. Water supply is the ranch's one million gallon reservoir that is distributed by a 10 inch supply line for both domestic and agricultural use. The subject residence is sound and almost free of cosmetic and structural problems with the exception of cracks in the concrete floor and porch floor decking that is an eastern hardwood.