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R40 sub -base material placement began. The R 40 material was hauled utilizing five (5) Cat 740 haul trucks and placed <br />in approximately 8 inch lifts by a Cat D6N dozer with GPS and A John Deere 1050J dozer. A Cat 773 water truck applied <br />water to the material prior to compaction performed by a Cat CS56B vibratory, 10 -ton, smooth -drum roller. The roller <br />completed the minimum of four passes over the lift surface (per method specification). The haul trucks, loaded and unloaded, <br />drove over the backfill surface contributing to the overall compaction of the lift. <br />Two 90 foot long 18 inch galvanized corrugated steel underdrain pumpback pipes were installed during this <br />reporting period at the north end of the High 67 embankment. Each 90 foot length to of pipe was composed of three 30 foot <br />sections coupled together. The piping was placed on a 3 inch pipe bed of class 1 material. The pipes were placed 3 feet apart <br />on center line and back filled in 9 inch lifts. The fill was then compacted using a jumping -jack up to 1 foot above the pipe and <br />then using a CS568 vibratory, 10 -ton, smooth -drum roller at about 2 feet above the pipe. Nuclear Density testing was <br />performed on the compacted material, which resulted in compaction meeting the required compaction. <br />(7) 8 foot sections of 24 inch RCP were installed. The pipe was place on a minimum of 3 inches of bedding and backfilled with <br />select structural backfill (Class 1). A couple of informational density tests were taken to establish an effective method of <br />compaction. <br />South MSE Wall: <br />Construction of the South MSE wall continued. Subgrade was accepted and prepared by placing thin lift of 1.5 inch minus <br />material (low volume fill) over the granitic bedrock surface. The low volume fill was then compacted using a Cat CS43310- <br />ton, vibratory roller passing over the surface a minimum of 4 times. <br />Welded wire baskets were placed along the exterior of the wall's alignment and wire -tied together. Tensar UX1500 geogrid <br />were joined to the 18 inch wire welded basket leg lengths to create an 8.5 foot reinforcement length for the wall. Locking tail <br />struts were placed every 16 inches on center mechanically securing the geogrid to the baskets and reinforcing the front face <br />of the basket, stabilizing backfill and face rock were then placed. The stabilizing backfill and face rock were separated from <br />each other using non -woven geofabric. The stabilizing backfill was placed in 9 inch lifts and packed with plate tampers within <br />3 feet of the wall face and with the Cat CS433 10 -ton, vibratory roller on the areas greater than 3 feet in distance from the wail <br />face. The lifts were tested for moisture and compaction prior to starting the next mat. Compaction tests performed met or <br />exceeded 95% compaction. Reinforcing Fill material was moisture conditioned prior to placement. <br />Note: Tension of the Geogrid is being monitored during placement. Correlations of Nuclear Density Guages were <br />performed between CDOT and Amec. A total of three test locations were randomly selected with an average of four <br />tests performed at each location. The difference between the average test results between CDOT and Amec were <br />less than 2 %. <br />MSE wall components continue to be installed per plans and specifications. <br />11) Storm Water Management <br />Best Management Practices (BMP) are being performed. Erosion control efforts took place during this reporting <br />period. <br />CQA ACTIVITIES: <br />1) Field Activities: Observation of construction activities during this reporting period included: <br />topsoil /overburden stripping, production drilling and blasting, Cut to Fill ADR Haul Road (HR), HWY 67 construction, <br />PSSA Toe Berm Fill placement and compaction, MSE wail construction, Underground remediation and clay processing. <br />11) Laboratory Activities: Laboratory testing continued with Permeability, Particle Size Distribution, Atterberg Limits, <br />Moisture - Density, gradations and material classification and identifications and field material sampling were performed <br />during this reporting period as required. <br />LVSCF: Sample No's 67 thru 75 were obtained during this reporting period. <br />SLF: Sample No. 46 was obtained during this reporting period <br />Page 3 of 7 MLE2 WE 08.24.13.doc <br />