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Home My WebLink About; La Costa Plaza Shopping Center; Soils Report - Field Density Tests; 1973-01-17qeDIl,:,e , -. ,- ,- .- - .- .- .- .- - - BENTON ENGINEERING, INC. APPUED SOIL MECIIIN,CS .-~- FO”NO*TIONs 6717 C”N”O” COURT SAN DIEGO. C*L,FORNIA 02111 P”lLlP HENKING BENTON PIESlDLNT ClYlL LHGINLLII January 17, 1973 TELEPMONE ,714, 565.1856 La Cost0 Land Company Costa Del Mar Road Ranch0 La Costa, Collfornia 92008 RECEIVED Subject: Project No, 69-12-23D Fourth Interim Report JAN 1 9 1973 Results of Field density Tests Taken in Trench Rackfill CITY OF CARLSBAD La Costa Plaza Shopping Center Engineering DeWment Northeast of El Carnina Real and La Costa Avenue Carlsbad, California Gentlemen: This is to report the results of field density tests taken in soils placed as backfill over electrical and sewer lines at the subject site. The tests were taken during the period between August 88 and August 17, 1972. The approximate locations at which the tests were taken are shown an Drawing No. 1A and the finol test results are presented as fallows: Test. No. Depth of Fill at Test In Feet Maximum Field DV DV Moisture Denslty Density Percent % dry wt lb/cu ft Ib/cu ft Compaction Tests Taken in Backfill Over Electrical Duct Remorks 1A 2A 1.0. 10.8 102.8 113.1 90.7 1.0* 8.7 102.5 113.1 90.5 l Indicates depth of fill over electrical duct or sewer pipe - .- - SlOlO .16.24 _~ _- - - - - - - - - .-. - - - - - Proiect No. 69-12-230 La Costa Plaza Shopping Center -2- Jonuary 17, 1973 Test No. Depth of Fill at Test In Feet Maximum Field W DV Moisture Density Density Percent % dry wt Ib/cu ft Ib/cu ft Compaction Tests Taken in Backfill Over Sewer Lines 1 2.0. 15.6 108.7 116.8 93.0 2 3.0* 16.1 110.4 119.1 92.8 3 4.0. 13.8 103.2 114.4 90.2 4 4.0. 15.5 104.1 113.9 91.4 5 6.0 l 13.1 107.7 116.8 92.2 6 5.0. 16.3 112.5 116.8 96.4 7 8.0. 14.3 110.7 118.2 93.6 8 6.0 e 16.2 108.5 118.2 91.7 9 9.0’ 15.6 103.3 114.4 90.2 10 10.0.. 12.7 98.8 116.8 84.5 11 5.0” 13.3 114.4 121.4 94.3 12 10.0 l * 15.7 98.3 113.9 86.4 13 10.0 ** 20.2 100.8 111.1 90.7 14 6.0. 12.5 107.4 119.1 90.2 15 4.0. 14.3 101.2 114.1 88.6 16 4.0. 16.7 103.7 114.1 90.7 17 4.0 14.8 102.6 114.1 90.0 18 8.0.. 12.3 111.6 116.8 95.6 19 6.0 l * 13.0 101.9 113.1 90.0 Remarks Reworked Reworked Ck on 110 8 12 Reworked Ck an f 15 * Indicates depth of fill aver electrical duct or sewer pipe l ’ Indicates finished grade LABORATORY TEST RESULTS The maximum dry densities and optlmum moisture contents of the major fill materials as determined by the A.S.T,M. D 155766T method, that uses 25 blows of a 10 pound mmmer falling from a height of 18 inches on each of 5 layers in a 4 inch diameter l/30 cubic foot compaction cylinder, are presented as followr: Soil Description Slightly clayey very fine sand, light brown and yellowish Clayey very fine sand with clay binder, light gmy Clayey very fine to fine sand, light brown ond light gmy Slightly clayey very fine ta fine sand, light gray with reddfsh brown Maximum Optimum Mois- Dry Density turn Content Ib/cu ft % dry wt 114.4 13.1 116.8 12.5 115.0 13.1 121.4 10.6 Clayey very fine sond, Ilght gray and light brown Clayey very fine sand yellowish brown Clayey very fine sand, I ight yellowish brown 111.1 12.0 114.1 13.5 113.1 14.7 BENTON ENGINEERING. INC. -- Project No. 69-12-23D La Costa Plaza Shopping Center Repectfully submitted, - BENTON ENGINEERING, INC. - - - - -3- January 17, 1973 BY&L!& R. C. Rdmer Reviewed by nd V Pothier, Civil Engineer ” . Distr: (4) La Costo Land Company La Costa Land Company (1) Attention: Mr. Burton L. Kmmer (1) Attention: Mr, Irv Roston (1) George R. Saunders 8 Associates (2) Rick Englneerfng Company, Carlsbad (1) City of Carlsbad Engineering Dept. RCR/PHB/prw BENTON ENGINEERING. INC.