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Home My WebLink About; Plaza Camino Real TBA Bldg Areas; Soils Report; 1968-02-15.- 4 .‘ INSPECTION AtiD TESTING OF CO?IPACTED FILLS T.B.A. BUILDING AREAS PLAZA CAMINO REAL SHOPPING CENTER NEAR EL CA?UNO REAL MD VISTA FREEWAY CARLSBAI!, CALIFORNIA FOR THE PLAZA C&&IN0 REAL (OUR JOB X0. B-67057) CONS”LTlNG FOUNDATION ENGINEERS Bi. 7’1 NORTH ALVARADO STREET n LOS ANGELES.CAL,FOANIA 90026 0 TELEPHONE 386~3920 LEROY CRANDALL AND ASSOCIATES February 15, 1968 Plaza Camino Real c/o Krumm and Sorenson 520 West Seventh Street Los Angeles, California 90014 Attention: Mr. Gerald Sorenson (Our Job No. B-67067) Gentlemen: Inspection and T-sting of Compacted Fills T.B.A. Building Areas Plaza Cmino Reel Skopping Center Near El Carnino Real and Vista Freway Carlsbad, California for the Plaza Canine Real --______ This report presents the results of OUT inspection and testing of the compacted fills placed to raise the fir.ished grade of the 3. C. Penmy .md Xay Ccmpany TBA Buildings; we a!.~ observed the construction of settlement monuments in these two aress, the placement of surcharge fills for the 'IRA Building are-s and an extension to the WooLGgorth Buiiding, and the correction of eroded areas at the site. Previous re- ports of investigatiol:s and testing services ai the site were submitted on Augut 12, 1466 (cm- Job No. A-660353, January 12, 1967 (our .Jqb No. B-661.65), and April 6, 1967 (our Job Xo. A-66035-B). Fur tiler recoimen- datiom regarding surcharging of the expansion of the Woolworth Store Boildiiq were subnitred in a letter dated Xay 25, 1967. L.LLROY CRANWLL. c. E. RUSSELL c. WE.3ER.C~ E FREDR,CK A. BARNES J D. KIRKGARD, c. E. rr”n, n YiDF,.UCC, “T id&Arc M M,.WFF c F SEYMOUR s. CHIU, c, Ed P. A. MAUIAN, c, E. Il”PFPT CUIF911771 r c Plaza Camino Real Page 2 February 15, 1968 (Our Job No. B-67067) The additional earthvork required for the two TBA Building areas consisted of stripping of the surface vegetation from the two sites; this consisted of a light weed growth which had developed in the compacted fill previously placed. The locations of the txo TBA Buildings are defined by the project coordinates on the attached Plot Plan. After the stripping, roughly six to twelve inches of loose soil which had eroded from the main surcharge area was removed. The soils thus exposed were to be scarified to a depth of at least six inches, moistened as necessary, and rolled with heavy compaction equipment. Fill material was then to be placed in thin loose lifts, moistened as necessary, and compacted to at least 95% of the maximum dry density obtainable by a modification of the ASTM Designation D1557-66T method of compaction. After completion of the compacted fill, settlement monuments were to be constructed, and surcharge fill placed and wheel-rolled in layers; no specific degree of compaction was required for the surcharge fill. The soils atilized for the filling were obtained from the site, and from cuts for access roads. Compaction tests were performed on the various soils utilized for fill, to establish the maximum dry densitie.7. The tests were performed in accordance with the specified method of com- paction, which utilizes a l/30-cubic-foot mold in which each of three layers of soil is corr,pacted by 25 biows of a ten-pound hamuer falling 18 inches. The results of the compaction tests were utilized in establishing the degree of compaction achieved during the placing of the fills. Plaza Camino Real Page 3 February 15, 1968 (Our Job No. B-67067) _I- After the two sites had been stripped of vegetation, and the loose eroded soils removed, the exposed surface soils were scarified, moistened as necessary and compacted. The fill materials were then placed in thin loose lifts, brought to approximately optimum moisture content, and com- pacted. Field density tests were taken as the filling progressed, to es- tablish the degree of compaction achieved. Where the test results indi- cated less than 95% compaction, the soils in that area were recompacted and retested until at least the specified degree of cdmpaction resulted. The locations of the tests are shown on the Plot Plan; the results of the tests are presented in the attached Table of Test Results. The resulting compacted fill will provide adequate support for foundations as previously discussed in our foundation investigation reports. After completion of the proper compacted fill, four settlement lfronuments were constructed in each building pad, the elevations of the monuments determined, and then the temporary surcharge fills constructed. Our representative also observed placement of the surcharge fill extension, for the Woolworth Store Building. Further, the eroded areas along the north slope of the main surcharge area were repaired; fill materials were placed in the erosion gullies ir. lifts and rolled with the construction equipment. Yours very truly, LeROY CRANDALL Ah9 ASSOCIATES '/~-..-, RW-.lg by i‘y&*,g f--&/g&~,- Attachrients (2) Russell C. ideber (6 copies subnitted) cc: (2) s;1uircan . Rogcmay and Associates (2) City of Carlsbad, Engineeri,ng Department ;- ,TABLE OF --- -- -- rEsr REsVLrs MOISTURE DRY MAxmuM TEST ELEVATION CCNTENT DENSITY DENSITY PERCENT NO., (FEET) (% OF DRY WT.) (LBS./CU.FT.) (LBS./CU.FT.) COMF'ACTIO~ 1 27% 11.8 112 2 28 6.5 109 3 29 11.4 101 4 30 6.1 106 5 29% 13.1 106 6 30% 9.6 113 7 31% 8.9 114 8 32% 10.0 114 9 20% 12.2 111 10 22 10.2 102 118 95 110 99 110 92* 110 96 110 96 118 96 118 97 118 97 116 96 110 93* 11 22 9.7 107 110 97 12 23 9.5 113 116 97 13 24 7.1 112 116 97 14 25 6.3 113 116 97 NOTES: Elevations refer to job datum. * Indicates arca reworked and retested.