2013-09-25_REPORT - M1980244 - Laserfiche WebLink

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�v w ilm proof roll and identified a number of locations that required additional work. The areas in question were reworked by ripping the surface and allowing the material to dry before recompacting the material. A proof roll was performed at approximately 12:00 (noon) on Wednesday 8.28.13 with an Ames' tandem water truck. The proof roll was observed by Thorne Clark (Amec), Lesley Mace (CDOT) and Fred Taylor (Yeh and Associates). Four to five areas were identified and marked with paint that required additional work. Ames repaired the areas immediately by ripping the surface with a Cat 160M, GPS enabled grader, allowing the material dry, and then replacing it in lifts less than eight inches. Each lift was then compacted with a Cat CS56B vibratory, 10 -ton, smooth-drum roller with the minimum of four passes (per method specification). Ames saw cut the asphalt on existing US 67 at the fie in locations with the realigned US 67. Traffic control was set for one lane traffic while the saw cutting was being performed. Guardrails were removed and replaced with berm material and Jersey - barriers on the north side of the fill area in preparation to tie the existing highway into the realignment embankment. ft should be noted: during the reporting period the proposed Class 6 ABC material sourced at the Mule Creek Pit was rejected due to material being out specification. On Friday 8.30.13, another source provider was determined and a Class 6 Aggregate Base Coarse (ABC) sample was obtained from the Schmidt Pit in Fountain, Colorado by Yeh and Associates, Amec, and CDOT for laboratory analysis. Results are expected during the next reporting period. South MSE Wall: Ames continued mat construction and underdrain placement during this reporting period. Mats were constructed by placing welded wire baskets along the exterior of the wall's alignment. The baskets were wire -tied together with approximately 2.5 inches of overlap. Approximately 8 foot lengths of Tensar UX1500 geogrid were joined to the 18 inch wire welded basket leg lengths to create a 9.5 foot reinforcement length for the wall. Tensar UX1500 was pulled taught against the wire baskets and secured by hand while placing reinforcing fill material. Tensar LH800 geogrid was installed on every other mat for the attachment of the timber facing. Locking tail struts were placed every 16 inches on center mechanically securing the geogrid to the baskets and reinforcing the front face of the basket. A tail strut was also added at the 2% inch horizontal wire overlap of the basket. Face rock was placed in the wire baskets after lining the interior front face of the basket with BX1120 geogrid. Reinforcing fill material and face rock were separated from each other using non -woven geotextile material. The reinforcing fill material was placed in 9 inch lifts and packed with plate tampers within 3 feet of the wall face and with the CS433 vibratory roller on the areas greater than 3 feet in distance from the wall face. Each mat was tested for compaction and moisture content at the completion of mat prior to placement of next mat. Compaction tests performed met or exceeded 95% compaction. Reinforcing fill material was moisture conditioned prior to placement. Ames continued placement of the underdrain at the back of the MSE wall along the face of existing rock. Non -woven geotextile was placed along a trench at the back of the wall where the reinforcing fill meets the native granite wall. Four inch diameter, perforated, corrugated, HDPE piping was laid out in the trench on top of the geotextile. Drain rock was placed over the pipe and wrapped with geotextile with a minimum of 18 inch overlap prior to placement of reinforcing fill. Reinforcing fill was placed in 9 inch lifts and compacted using a Cat CS433E smooth drum vibratory roller. MSE wall components continue to be installed per plans and specifications. It) Storm Water Management Best Management Practices (BMP) are being performed. Erosion control efforts took place during this reporting period. CQA ACTIVITIES: 1() Field Activities: Observation of construction activities during this reporting period included: topsoil /overburden stripping, production drilling and blasting, Cut to Fill ADR Haul Road (HR), HWY 67 construction, PSSA Toe Berm Fill placement and compaction, MSE wall construction, Underground remediation and clay processing. Page 3 of 7 MLE2 WE 08.31.13.doc