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Home My WebLink AboutCT 80-38; Palomar Oaks Business Park Lots 17-19; Soils Report; 1989-08-17-. - - - - - - - - - - ENGINEERlNG DEPT. L!BRARY City of Ca:lsbad 2075 Las PalmaS r\!iv9 Carlsbaci, CA92iW4859 2fzZ.Q7.03 Dw6 %h REPORT OF zq0-5 FIELD OBSERVATIONS AND RELATIVE COMPACTION TESTS LOTS 17, 18, AND 19 PALOMAR O&K,cSB;INESS PARK CARLSBAD, CALIFORNIA PREPARED FOR: Madison Square Partnership 4223 Ponderosa Avenue, Suite A San Diego, California 92123 PREPARED BY: Southern California Soil & Testing, Inc. Post Office Box 20627 6280 Riverdale street San DiegO, California 92120 - - - - -. - - - - - 4% T August 17, 1989 .- - -- - - - - __ - - - - Madison Square Partnership 4223 Ponderosa Avenue, Suite A San Diego, California 92123 SCS&T 8821047 Report No. 12 SUBJECT : Report of Field Observations and Relative COmpaCtiOn Tests, Lots 17, 18, and 19, Palomar Oaks Business park, Carlsbad, California. REFRRRUCE: 1) "Report of Field Observations and Relative Compaction Tests, Lot 17", prepared by Southern California Soil & Testing, Inc., dated October 19, 1988. 21 "Report of Soil Investigation, Lot Numhers 18 and 19", prepared by Southern California Soil & Testing, Inc., dated October 3, 1988. Gentlemen: In accordance with your request, this report has been prepared to present a summary of our field observations and the results of relative compaction tests performed at the subject site by Southern California Soil & Testing, Inc. These services were performed between August 1 and August 16, 1989. SOUTHERN CALIFORNIA SOIL AND TESTING. I N c. - - - - .,- - - - - - - SCSLT 8821047 August 17, 1989 Page 2 SITE DRSCRIPTIOB The subject lots are designated as lots 17, 18, and 19 of Palomar Oaks Business Park located on Paseo De1 Lag0 in the City of Carlsbad, California. The lots are bounded on the west by a natural hillside that extends up to a plateau which is utilized for agricultural purposes, on the north and south by other lots in the subdivision and by Paseo De1 Lago on the east. The lots had received previous grading in 1982 during the mass grading for the subdivision. Lot 17 had received additional grading in 1988 under the observation and testing services of our firm (See Reference NO. 1). Prior to this phase of work, vegetation on site consisted only of sparse grasses. PROPOSED COPSTRLlCTIOU It is our understanding that concrete tilt-up structures are planned for the subject lots. Shallow spread footings are anticipated for the structure on lot 17, whereas driven concrete pile foundations are anticipated for the structures on lots 18 and 19. Concrete slab-on-grade floor systems are anticipated for all the structures. AVAILABLE PLARS To assist in determining the locations and elevations of our field density tests and to define the general extent of the site grading for this phase of work, we were provided with a grading plan prepared by Henry Worley Associates, Inc., of San DiegO, California, dated March 20, 1989. - - - - - - - SCS&T 8821047 August 17, 1989 Page 3 SITE PRRPARATIOB Prior to the grading operations, the site was cleared of vegetation and materials thus generated were exported from the jobsite. Grading operations then proceeded as described in the following paragraphs. - - - - - - - - - LOT 17: During this phase of work, the existing surfaces exposed on lot 17 were scarified to a depth of approximately 12 inches, moisture conditioned, and recompacted to a minimum of 90 percent relative compaction. Minor amounts of additional fill were then placed on the building pad. These fills were on the order of one foot or less in depth and were compacted to a minimum of 90 percent relative compaction. LOTS 18 ARD 19: Grading operations on lots 18 and 19 began with the removal of the existing near surface soils to a depth of approximately four feet below the proposed finished grade elevation. Horizontally, the limits of these removals extended to a minimum of five feet beyond the limits of the proposed structure. In the parking areas, the depths of removal were on the order of two feet below the proposed finished grade elevation. Soils generated by the removal operations were stockpiled for later use or placed as uniformly compacted fill in previously prepared areas. Prior to the placement of fill, the soils exposed at the bottoms of the excavations were scarified to a depth of approximately twelve inches, moisture conditioned, and compacted. The excavated soils were then replaced in approximate six to eight inch lifts, moisture conditioned to near optimum moisture content, and compacted to a minimum of 90 percent relative compaction by means of heavy construction equipment. - - - - .~~ - - - - X.9&T 8821047 August 17, 1989 Page 4 FIELD OBSRRVATIOR AND TRSTIRG Observations and field density tests were performed by a representative of Southern California Soil & Testing, Inc. during the site grading operations. The density tests were taken according to A.S.T.M. Test 1556-74 and the results of those tests are shown on the attached Plate No. 4. The accuracy of the in-place density test locations and elevations is a function of the accuracy of the survey control provided by other than Southern California Soil & Testing, Inc. representatives. Unless otherwise noted, their locations and elevations were determined by pacing and hand level methods and should be considered accurate only to the degree implied by the method used. AS used herein, the term "observation" implies only that we observed the progress of work we agreed to be involved with, and performed tests, on which, together, we based our opinion as to whether the work essentially complies with the job requirements, local grading ordinances and the uniform Building Code. - - - LABORATORY TESTS Maximum dry density determinations were performed on representative samples of the soils used in the compacted fills according to A.S.T.M. Test 1557-78, Method A. This method specifies that a four inch diameter cylindrical mold of l/30 cubic foot volume be used and that soil tested be placed in five equal layers with each layer compacted by twenty-five blows of a 10-pound hammer with a 18-inch drop. The results of these tests, as presented on plate NO. 5, was used in conjunction with the field density tests to determine the degree of relative compaction of the compacted fill. - - - - - - - .-, - - - - SCSfiT 8821047 August 17, 1989 Page 5 REUAIUIUG WORK Additional grading and backfill operations will be required at the site for the backfill of retaining walls and utility trenches, the preparation of the subgrade soils, and the placement of the base material. It is recommended that in-place density tests and field observations be performed during each of these operations to verify that they are performed in accordance with job requirements. Based on our field observations and the density test results, it is the opinion of Southern California soil & Testing, Inc. that the grading was performed basically in accordance with the recommendations contained in the referenced Report of soil Investigation, and the recommendations contained therein do apply to the subject site. LIMITATIONS This report covers only the services performed between August 1 and August 16, 1989. AS limited by the scope of the services which we agreed to perform, our opinions presented herein are based on our observations and the relative compaction test results. Our services were performed in accordance with the currently accepted standard of practice and in such a manner as to provide a reasonable measure of the compliance of the grading operations with the job requirements. No warranty, express or implied, is given or intended with respect to the services which we have performed, and neither the performance of those services nor the submittal of this report should be construed as relieving the grading contractor of his responsibility to conform with the job requirements. - - ,- - - - - SCS&T 8821047 August 17, 1989 Page 6 If you should have any questions after reviewing this report, please do not hesitate to contact this office. This opportunity to be of professional service is sincerely appreciated. Respectfully submitted, SOUTHERN CALIFORNIA SOIL E. TESTING, INC. Charles H. Christian, R.G.E. t00215 CHC/MH/rr CC: (4) Submitted (1) SCS&T, Escondido - - - - - - - - - JOB NAME: Palomar Oaks JOB NO: 8821047 PLATE NO: 4 TEST DATE LOCATION ELEVATION MOISTURE DRY DEN. SOIL REL.COMP -. NO. (percent) (p.c.f.) TYPE (percent) ------------_______-____________________------------------------------------- 1 2 3 4 - 5 6 7 - 8 9 10 11 12 13 14 15 16 17 18 19 20 ~_. 21 22 23 24 - 25 26 27 -- 28 29 30 - 31 32 33 34 - 35 36 37 38 39 40 41 8-l-89 Lot 19, Parking 195.0 16.3 108.4 1 91.9 8-l-89 Lot 19, Parking 197.0 17.0 109.6 1 93.0 8-2-89 Lot 19 195.0 PNG 8.1 101.6 1 86.2 8-2-89 Lot 19 196.0 14.3 111.2 1 94.3 8-2-89 Retest of 3 195.0 15.6 108.7 1 92.2 8-2-89 Lot 19 197.5 14.9 107.3 1 91.0 8-2-89 Lot 19 198.5 17.6 106.5 1 90.3 8-3-89 Lot 19 195.0 15.6 110.3 1 93.6 8-3-89 Lot 19 196.5 15.6 108.1 1 91.7 8-3-89 Lot 19 198.0 15.6 111.6 1 94.7 8-4-89 Lot 19 197.5 17.0 110.2 1 93.5 8-4-89 Lot 19 198.5 15.6 111.2 1 94.3 8-4-89 Lot 19 199.0 14.9 107.0 1 90.8 8-4-89 Lot 19 199.0 16.3 108.5 1 92.0 8-7-89 Lot 19 198.0 17.6 109.6 1 93.0 8-7-89 Lot 19 198.5 14.3 108.3 1 91.9 8-7-89 Lot 19 199.0 15.6 112.2 1 95.2 8-10-89 Lot 19 199.0 FG 14.9 110.4 1 93.6 8-10-89 Lot 18 280.0 PNG 17.6 108.5 1 92.0 8-10-89 Lot 18 181.5 16.3 107.8 1 91.4 8-10-89 Lot 18 182.5 14.3 113.6 2 92.9 8-10-89 Lot 18 183.0 16.3 112.0 2 91.6 8-11-89 Lot 18 179.5 PNG 13.6 114.3 2 93.5 8-11-89 Lot 18 181.0 15.6 111.3 2 91.0 8-11-89 Lot 18 182.0 13.0 111.1 1 94.2 8-11-89 Lot 18 183.5 12.4 112.5 2 92.0 8-11-89 Lot 19, Parking 196.0 14.3 107.9 1 91.5 8-14-89 Lot 19, Parking 196.0 14.3 111.3 2 91.0 8-14-89 Lot 19, Parking 197.0 16.3 106.9 1 90.7 8-14-89 Lot 18, Parking 183.5 15.6 112.2 2 91.7 8-14-89 Lot 18, Parking 182.5 14.9 112.5 2 92.0 8-14-89 Lot 18, Parking 180.5 15.6 111.5 2 91.9 8-14-89 Lot 18 184.0 FG 14.3 114.6 2 93.7 8-15-89 Lot 17 174.0 13.6 112.5 2 92.0 8-15-89 Lot 17 174.5 14.9 110.2 1 93.5 8-15-89 Lot 17 174.0 14.3 111.9 2 91.5 8-15-89 Lot 17 175.0 14.3 113.7 2 93.0 8-15-89 Lot 17 175.0 FG 17.0 110.5 1 93.7 8-15-89 Lot 17, Parking 175.5 11.7 112.2 2 91.7 8-15-89 Lot 17, Parking 173.0 13.0 112.6 2 92.1 8-16-89 Lot 17 175.0 FG 10.8 121.5 2 99.3 - - PNG - Prepared Natural Ground FG - Finished Grade - JOB NAME: Palomar oaks JOB NO: 8821047 PLATE NO: 5 MAXIMUM DENSITY AND OPTIMUM MOISTURE DETERMINATIONS, ASTM 1557-78 ------_-_________-______________________------------------------- SOIL METHOD DESCRIPTION OPTIMUM MAXIMUM TYPE MOISTURE DENSITY (percent) (pcf) 1 A Brown, Fine, Silty 15.6 117.9 Sand 2 A Grayish Brown, Fine 13.7 122.3 to Medium Silty Sand - - - - - -