ARCHIVED REPORTS_2003 - Laserfiche WebLink

Home Browse Search

Foothill Sanitary Landfill — Module 1 December 2003 County of San Joaquin Job No. 031602.00.02 Atterberg Limits and Grain Size Analysis of Foundation Layer Soils The CQA testing for the foundation layer soils consisted of Atterberg limits (ASTM D- 4318), sieve analysis (ASTM D-422), and sieve wash (ASTM D-1140), once per 10,000 cubic yards (cy). In addition, visual soil descriptions and soil classifications were performed on the samples collected for Atterberg limits and sieve analysis. Twenty (20) sieve analyses and Atterberg limit tests were performed. The percent minus the No. 200 sieve for the foundation layer material ranged from 30.0% to 61.5%. The liquid limit and plasticity index for the foundation layer material ranged from 28% to 41 % and 2% to 14%, respectively. Detailed results of the fine-grained material testing is included in Appendix C. • Modified Proctor (ASTM D-1557) Vector's CQA Monitors performed twenty-one (21) moisture -density relationship tests (ASTM D-1557). Results of these tests are included in Appendix C. • Moisture and Density Testing Our CQA Monitors performed 258 passing in-place unit weight (ASTM D-2922) and in-place moisture content (ASTM D-2216) tests during the compaction of the foundation layer soil materials. Based on 48,200 cubic yards (cy) of placement, the total number of passing tests performed corresponds to a frequency of 1 per 187 cy, which satisfies the minimum required frequency of 1 per 250 cy. Areas that failed to meet the acceptable compaction were reworked and/or replaced and retested. Summaries of the field moisture/density testing are tabulated in Appendix C. Density Verification • Sand Cone Density To verify the in-situ density determination by the nuclear gauge, the wet density values obtained by the nuclear gauge were compared to the wet density determined from the sand cone tests. Nineteen (19) sandcone tests were conducted at a frequency on 1 per 2,537 cy, which meets the required frequency of 1 per 3,000 cy. Results indicated that on average the densities obtained by the sandcone method were within 0.13 pcf of the nuclear gauge and thus deemed acceptable. Upon completion of the foundation layer, the Contractor prepared the surface for geosynthetics placement by smooth drum rolling the area. Vector's CQA Monitor observed the smooth drum rolling procedure and advised the Contractor of areas where ridges, rough areas, voids, and exposed gravel were present so that these areas could Vector Engineering, Inc. - 143E Spring Hill Drive • Grass Valley, CA 95945 • (530) 272-2448 14