ARCHIVED REPORTS_1996 - Laserfiche WebLink

Home Browse Search

File No. 20-1008-36 May 20, 1996 SITE PREPARATION Prior to construction of the foundation layer, the site was cleared of all brush, grass and any other organic matter which had grown subsequent to the completion of the foundation layer. Foundation material removed during the course of this procedure was replaced, and the foundation layer was restored to its original final grade and surveyed by Sanguinetti and Associates. Sanguinetti and Associate's survey results are provided in the Final Documentation Report. Moisture conditioning was performed with the aid of a water truck. Samples of the foundation layer were randomly acquired in accordance with the CQA plan for compaction curves and soil classification. The sample test results are summarized with barrier layer testing in Table IV. Compaction curves are summarized in Table V, attached at the end of the report. The foundation layer was compacted to a minimum relative compaction of 90 percent (ASTM test method D-1557 "A") with a CAT 825C sheepsfoot compactor. Actual compaction results are presented in the section titled"Field Compaction Test Results." BARRIER LAYER CONSTRUCTION Approximately 12 to 13 inches of SM/ML borrow stockpile materials were placed by Granite on top of the foundation layer by belly dump haul trucks. Between November 2, 1995 and January 10, 1996, haul trucks (each carrying approximately 25 tons) delivered red clay from Granite to the site. The trucks placed the approximate 4 to 5 inches of red clay over the 12 to 13 inches of borrow stockpile materials. Samples of the red clay were randomly acquired in accordance with the CQA plan for Atterberg Limits and hydrometer analyses and are summarized along with sample locations in Table H below. A motor grader CAT 14G and a Cat D 9N dozer spread the clay to a fairly-uniform thickness of about 4 to 5 inches during each day it was delivered. The spreading effectiveness was confirmed by measuring with hand tools clay thickness at random locations during each day of placement. TABLE H SUMMARY OF RED CLAY CQA TESTING Sample Northing Easting Liquid Plasticity % % % No. Limit Index Sand Silt Cla 1 8650 9175 29 19 52 28 20 2 9000 9150 40 27 48 26 26 3 8900 1 9300 1 40 1 28 1 51 1 26 4 9225 10650 38 20 45 32 ±:2j Premixing of the red clay and the upper soil (for both the 20 and 30 percent red clay mixtures) was performed by a large motorized pugmill (Raygo and CAT SM-350 soil stabilizers). Initial mixing involved one pass at full depth (approximately 16 to 18 inches) to achieve the required gradation specifications of 60 percent passing the No. 4 sieve (0.19 inch) and 100 percent passing the 1-inch sieve and to initially blend the red clay and stockpile soils. Final mixing involved two passes to add water to the soil by utilizing a spray bar attached to the mixer. Samples of the barrier layer materials were then acquired for compaction curves, Atterberg Limits, gradations, and hydrometer analysis. The barrier layer soils were classified as silty clayey sand with some gravel (SC) or silty sandy clay with some gravel (CL). The differing classifications were a result of stockpile soil composition. Results of tests for Atterberg Limits, gradation(including hydrometer), compaction and optimum moisture content are summarized in 20-1008-36/11B?960031 Page 3 of 7 01996Kleinfelder,Inc.