09-22-2004 Council Agenda - Laserfiche WebLink

Home Browse Search

Aug 26 04 07:56a Jon Whitcomb FRIG 25 '04 02t39PM BRAUN INTERTEC 651- 430 -0029 p.14 P, 14/23 Wesley Investments, Inc. Project. SP- 0403734 May 21, 2004 Page 9 D.6.c. Backlit'_ We recommend that back it( placed over the utilities consist of mineral sods placed in lifts not exceeding 8 to 10- inches and compacted in accordance with Table 2 of Section D. 1.c. Non- organic mineral soils excavated from the utility trench can be reused as backfill provided that it is placed within a moisture range suitable for compaction. 0.7. Additional Recommendations for Construction D.7.u. Observations. We recommend that all excavation, footing, slab and pavement subgrades he observed by a geotechnical engineer to evaluate if the subgrade soils are similar to those encountered by the borings, adequate to support the proposed construction and adequately oversized. These observations should be conducted prior to placing backfills, fills, or forms for footings. D -7.h. Testing. We recommend density tests of backfills and fills placed beneath footings, slabs and pavements. We also recommend density testing of the compacted pavement subgrade and iave1 base course. Samples of proposed backfill and fill materials should be submitted to our testing laboratory at least three days prior to placement for evaluation of their suitability and determination of the optimum moisture content and maximum dry density. reee:i......:,.. at least one density test for every 100 cubic yards of fill placed beneath building areas with at least one test for every 2 feet of fill placed. At least one compaction test should he taken for every 100 feet of trench at vertical intervals not exceeding 2 feet. E. Field Procedures E.J. Drilling and Sampling The penetration test borings were performed on April 29, 2004, ,using a truck- mounted drill rig equipped with 3 1/4-inch inside diameter hoilow-stem auger Sampling for the borings was conducted in general accordance with ASTM D ; 586, "Penetration Test and Split- Barrel Sampling of Soils." Using this method. we advanced the borehole with the hollow -stem auger to the desired test depth. A 140 -pound manual or automatic hammer falling 30 inches was then used to drive the standard 2 -inch split - barrel sampler a total penetration of I t/2 Feet below the tip of the hollow -stem auger. Tht blows for the last foot of penetration were recorded and are an index of soil strength characteristics. Samples were taken at 2 112-foot vertical intervals to the 15 -foot depth and at 5 -foot intervals thereafter, A representative portion of each sample was then sealed in a. glass jar.