ARCHIVED REPORTS_1994_1 - Laserfiche WebLink

Home Browse Search

kn KLE{NFELDER of Ione clay (by dry weight) be blended with the borrow materials. The recommended minimum degree of compaction is 95 percent of the maximum dry density as determined by the ASTM D1557 test procedure. It is recommended that the moisture content of the soil/clay mixture be at least 3 percent over optimum. We recognize that clean sand, similar to samples 3 and 8 may be encountered during the initial borrow excavation. Should this situation occur, generally two options are available. One option is to separate these clean materials for use elsewhere. Another option is to i increase the amount of Ione clay. (The second option is not generally preferred). Regarding the latter option, the likelihood of Ione clay being mixed only with a clean sand vanes depending upon which borrow site is used. For example, the material stockpiled at the North County landfill has already been handled once. By the time this material is - loaded into trucks, dumped at the existing site, spread and mixed, the likelihood of clean _ sand being exposed is low. In contrast, if clean sand layers are encountered at the borrow r-• site at the existing Harney Lane Landfill, it is much more possible that these clean sand layers could be deposited uniformly on grade. If clean sands are used, an additional five to ten percent of lone clay may be added. 2.5 CONSTRUCTION r- The SJDPW will perform construction of the final cover using experienced equipment operators who have performed installation of portions of the foundation layer completed to date and closure construction plan for the landfill. As mentioned previously, the SJDPW may also hire a qualified earthwork contractor to assist with construction. The SJDPW construction team for the project is described in Chapter 3, Project Organization. F 2.6 CQA TESTING All CQA testing will be performed according to requirements of Section 17774, Title 14 as !` described in this document. As indicated in 2.1, SJDPW will carry out field and laboratory testing of the foundation and vegetative layers. Kleinfelder, as construction monitor will falso perform a limited number of tests on these layers to verify the results obtained by SJDPW staff. Kleinfelder, as CQA Monitor, will perform all of the CQA testing of the test pad and barrier layer. CR9-42 Page 8 of 28 Copyright 1991 Kleinfelder, Inc.