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Home My WebLink AboutCT 76-17; Canon Park Unit 1 Lots 5-6; Soils Report; 1977-03-11RECEIVED :?:,R 1 4 1977 ..- - - .- - - - - - - PH(ILIP HENKINO BENTON P”C.10~NT ClYlL r*(il*lr.” La Costa Land Company 2100 Costa Del Mar Road Corlsbad, Caliiornio 92003 BENTON ENGINEERING, INC. APPLIED SOIL LIECHANICS ~- FOUNDATIDNS 6717 CONVO” COURT SAN DIEGO CALIFORNIA OZlll Aiorch 1 1, 1977 Su!bject: Project No. 77-i -5D Report on Compacted Filled Ground Lots 5 and 6 Canon Park Unit bjo. 1 Carlsbad, California CT- -m--n-- Gentlemen: This is to report the results of tests and observations made in order to inspect the compaction of Filled ground placed on certain areas of Lots 5 and 6 of Canon Pork Unit I,!o. 1 in Cal-lsbad, CaliFornia. The fills were placed dul.i”g tile period between Frb~-ua~y 28 ond March 11, 1977. The filled ground v/as placed under our inspection in accordance with the approved specifications. The grading plan used For the placement of filled ground was p~wpared bv Rick Engineering Cornpow:. The approximate locations at which the tests WC~E take” and the Final test results are present& on page 3, under the “Table of Test Results. ” The laborutorv deternlinutio”s of the maximum Iii-x,, densities and optimum moist!~;rc contents oi the major fill motel~ials al-e presented on page 3, under the “Laboratory Test Results. ” Some of the moximurm dt~\, densities shown i” the ‘,ioble of Test Results’; wcl-e com!>inotio”s of these. The tests VJ~I-E taken on tlx dates indicated belov,: Test t\lumbel- Date 1 Febi-uarv 28, 1977 2 Murch 1, 1977 3 hlol~ch 4, 1977 4, 5 and 6 ~,‘klrch 10, 1977 7, 3, 9 and 10 Mai-ch 11, 1977 The fincl results of tests and observations indicate that the compacted filled ground has been placed at 90 percent oi il1e r:iaximum Jr,;, densit\, ,>I~ gl-eu~er. It /has been determined that the iill material;, compacted to 90 percent of the maximum Jrv densit,i, have a safe bcaz~ing value OF ct least 1000 pounds per sc;uare foot for one foot wide continuous iootings founded at o depth OF G inches below the lowest adjacent iinol compacted ground suriace and placed Ifive feet or mol~e inside the top OF compacted Filled ground slopes. Ii footings ore placed closer to the exposed SlOlO .17.68 c.3 L - - - - - - - - - - - Project No. 77-l-50 Canon Park Unit No. 1 -2- March 11, 1977 slopes than 5 feet inside the top of compacted filled ground slopes, these should be deepened one foot below a 1 l/2 horizontal to 1 vertical 1 ine projected outward and downward from a point 5 feet horizontally inside ths top of compacted filled ground slopes. Tests indicate that the compacted filled ground is adequate to satisfactorily support the proposed one and two story wood frame dwellings without detrimental settlements. Expansive soil conditions exist in the upper three feet below finished grade. It is understood that the post-tension slab system, to be used for supp,ort of these houses, has been designed to minimize possible detrimental effects caused by the potentially expansive soil conditions. A plan showing the approximate areas and depths of Filled ground placed under our inspection in accordance with the approved specifications will be submitted with our final report on this project. Respectfully submitted, BENTON ENGINEERING, 1~. BY -&%?A R. C. Remer Reviewed by S. H. Shu, Civil Engineer R.C.E. No. 19913 Distr: (2) Addressee ( 1) Addressee - Attn: Mr. Burton C. /Cramer City af Co&bad (2) (1) (1) Building Department Rick Engineering Ca Woodward Companie; t - - - - - - - - - - - - - - Project NO. 77-l-5D Can& Pork Unit No. 1 -3- TABLE OF TEST RESULTS Test Ph. Approx- imate Location Lot No. Depth of Fill at Test in Feet 1 5 2.0 14.8 108.5 114.7 94.6 2 5 6.0 13.3 117.7 124.8 94.3 3 5 8.0 13.8 109.2 114.7 95.2 4 6 2.0 12.4 117.9 128.0 92.1 5 5 12.0 13.2 116.4 128.0 90.9 6 6 6.0 13.0 102.1 114.7 89.0 7 6 6.0 12.9 106.9 118.2 90.4 6 6 8.0 14.0 120.1 124.8 96.2 9 6 10.0* 11.0 111.1 121.6 91.3 10 5 13.0” 14.5 114.9 124.8 92.1 Fie Id Moisture % dry wt Drv Density Ib/cu ft Maximum b Density Ib/cu ft March 11, 1977 Percent Compaction Remarks Reworked Ck on ii6 * Indicates finished grade. LABORATORY TEST RESULTS The maximum dry densities and optimum moisture contents of the major fill materials os deter- mined by the A.S.T.M. D 1557-70 method, that uses 25 blows of o 10 pound rammer falling from a height of I8 inches on each of 5 layers in o 4 inch diameter l/30 cubic foot compaction cylinder, are presented os follows: Soil Description Groy with red brown and white silty clay Light yellow brown fine sandy cloy Brown clayey fine to medium sand Maximum Optimum Mois- Dry Density ture Content Ib/cu ft 96 dry wt 114.7 15.3 121.6 11.5 128.0 9.2 BENTON ENGINEERING. INC.