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III IIIIIIIIIIIIIIII STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman St., Room 215 Denver, Colorado 80203 DIVISION o F Phone: (303) 8663567 MINERAL S FAX; (3031 832-8106 & GEOLOGY DATE: March 24, 1999 MENINGM AFIE~TY TO: Dan Mathews gill Owens ~ Governor /~ Greg E. Watcher FROM: Jim Pendleton EnecuUVe Director Michael B. LOng Division Direcor RE: Red Cany Mine Sub ' once Structure Examinations, Geotech ations (Permit No: C-S1-034) In response to your' request, 1 accompanied you on an examination of the Hudson and Truitt residences. and a Mobile home owned by the Tmitts on Wednesday, March l7, 1999. At your request I had previously reviewed and corrunented on and inspection report. and photographs completed by you. The Hudson House Our examination of the Hudson residence discerned minor s[nlchrral distress, including hairline dryµ:111 cracks, foundation wall cracking with evidence of •.vater invasion, and foundation floor slab cracking. Each of these phenomena are common in structures. Non of the distress appeared severe ire terms of structural competence. Being a home owner, however, I understand that these "minor" features can be disturbing [o a home owner. Examination of the exterior of the structure discerned minor deflection of the northem, up slope wall of the suticture at hvo points, approximately 22 and 32 feet west of the northwest corner. The deflections corresponded to hairline to 1/16" wide foundation cracks observed inside the walk-out basement level half wall. The backfill adjacent to the foundation appeared to be damp in these areas. This northern wall is in the winter shadow of the structure. This winter has been a light snowfall year. Examination inside determined that the community potable water distribution system water service pipeline enters through the foundation in the immediate vicinity if the 32 foot crack and damp area. The suzrcture is founded on colluvial soils of the Williams Fork formation, with entrained erratic basaltic boulders weathered from the cap rock of nearby Grand Mesa. The predominantly clay to silt soils evidence "pop-corning", indicative of swell-shrinkage potential. Mr. Hudson reported that agravel-filled trench drain was installed up gradient approximately 20 feet from, and parallel to, the foundation wall. The structure was founded on a planar bench excavated into the gentle cross sloping lot. The foundation appears to have been placed on a concrete slab-on-grade. No foundational wall exists on the down grade walk-out basement horizon. The slab-on-grade is