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Home My WebLink AboutTract Map 9833-3 Lot 9 Field Density Testing REPORT of OBSERVATION and FIELD DENSITY TESTING for RESIDENTIAL GRADING Lot 9; TR 9833-3 APN: 945-150-009 LD02-246GR June 30, 2003 Prepared for: Bryan and Elizabeth Boster B & E Properties 1342 South Hills Drive Chula Vista, California 91915 619/216-8274 Prepared by: Gunvant Thakkar, P.E. 45712 Classic Way Temecula, California 92592 (909) 676-7541 \ GUNVANT THAKKAR, PROFESSIONAL ENGINEER 45712 Classic Way, Temecula, California 92592 909)676-7541 June 30, 2003 Bryan and Elizabeth Boster B & E Properties 1342 South Hills Drive Chula Vista, California 91915 619/216-8274 Project: Compaction Testing & Report Lot 9; TR 9833 APN: 945-150-009 LD02-246GR Dear Mr. and Mrs. Boster: In accordance with your request, we have prepared this compaction report for the subject property. The report represents a summary of the observations and compaction testing of the fill placed on the:proposed grading pad. Field testing and observations indicate the compaction and grading of theisoil was performed properly. The soil should perform satisfactorily for the expected usage. The included findings and recommendations have been derived in accordance with generally accepted professional principles and practices in the fields of soil mechanics and foundation engineering. This warranty is in lieu of all other warranties, either expressed or implied. Gunvant T 1.-- INTRODUCTION In accordance with your request, tests have been performed on the fill placed on the rough graded residential pad. The excavation, fill placement, compaction and testing associated with this phase of the grading was:performed during May 29 through June 20,2003. This report presents a summary of the testing services provided. PROJECT DESCRIPTION The site will have a single family residence with attached garage constructed on it with associated landscaping and access drive. This structure could consist of a one or two story, wood framed residence founded on a continuous perimeter footings foundation system. GRADING PROCEDURES . The observations and test results indicated that the grading was performed in the method consistent with the U.B.C. as amended by Ordinance 457. All areas to receive fill were stripped and cleared of vegetation and soft soil prior to placement of soil fill. Keying and benching into natural ground was completed in general compliance with the Uniform Building Code, Appendix Chapter 33. The minimum acceptable degree of compaction was 90 percent of the maximum density. FIELD DENSITY TESTING Field density testing was performed in accordance with ASTM 01556-64 (Sand Cone Method). The results of the field density tests are presented in Table I of this report. The approximate location of the tests are shown on the Plot Plan, Plate 1. MAXIMUM DENSITY DETERMINATIONS Maximum density / optimum moisture determinations were made from representative samples of on-site soils used in the fill operations. The tests were performed in accordance with ASTM 01557- 78 Method, '?J LIMITATIONS The~ findings and recommendations of this report were prepared in accordance with contemporary principles and practices in the field of geotechnical engineering. No other warranty or guarantee is either expressed or implied. Only a portion of the subsurface soils and conditions were evaluated or observed and the conclusions are based upon an interpretation of the soils conditions encountered in the field tests. Conclusions are also based on the assumption that these findings do not vary appreciably in the adjacent areas. However, minor variations may occur: should soil conditions significantly different be encountered in the future, an assessment of the impact on subsequent recommendations should be made. All future grading and fill placement should be performed under the inspection and testing of a registered civil engineer. SUMMARY Our description of grading and backfill operations, as well as testing services, were limited to those grading operations May 29 through June 20, 2003. The conclusions and recommendations contained herein have been based upon our observation and testing as noted. To the best of my knowledge, the work within my area of responsibility is in accordance with applicable provisions of U.B.C. as amended by Ordinance 457. Due to periodic site inspections and testing, footing excavations should be inspected by a registered civil engineer prior to concrete placement to verify proper embedment entirely into competent soils. REGOMMENDA TIONS 1. A minimum of three-feet over-excavation has been performed five feet outside proposed building limits to ensure a uniform blanket of a minimum of 90 percent compaction under structures. 2. A safe allowable 'bearing value for foundations embedded a minimum of 12" below lowest adjacent grade into competent ground is 1,500 psf. Continuous footings should have a minimum width of 12 inches, The isolated column footings should have a minimum embedment of 18 inches below lowest soil grade. 3, All concrete slabs on grade should be 4" thick. They should be underlain by 3" of sand or gravel. Areas that are to be carpeted or tiled, or where the intrusion of moisture is objectionable, should be underlain by 6 mil visqueen properly protected from puncture with an additional 1 " of sand over it. This arrangement of materials would result in a profile downward of concrete, 1" of sand, 6mil visqueen, 3" of sand and subgrade soil. Contractors should be advised that, when pouring during hot or windy weather conditions, they should provide large slabs with sufficiently deep weakened plane joints to inhibit the development of unsightly and irregular cracks. ~ 4. All footings for single story construction shall be a minimum of 12" in width and 12" in depth, measured below the lowest adjacent compacted or firm grade. For two story construction, the footings shall bea minimum of 15" in width and 18" in depth. All footings shall incorporate a minimum of one # 4 bar running continuously through the footings. The bars shall be lapped a minimum of 30 bar diameters and shall be placed approximately 3" from the bottom. All footings shall be extended to a depth sufficient to provide a minimum setback from the bottom of the footings to the daylight in any adjacent slope in accordance with U.B.C. 5. / ? GUNVANT THAKKAR, PROFESSIONAL ENGINEER 45712 Classic Way, Temecula, California 92592 (909) 676-7541 Mr. and Mrs. Boster Maximum Density Optimum Moisture Content (oct) (%) 129.5 10.5 Eleva- Max.Dry Water Dry Relative Method Tion Density Content Density Com pac- (Feet) (pcf) (%) (pcf) tion (%) 1, +8 129.5 10.2 116.6 90 SC 2, +7 129.5 10.5 117.8 91 SC 3. +6 129.5 10.2 118.1 92 SC 4, +4 129.5 10.5 121.7 94 SC 5. +4 129.5 10.8 117.8 91 SC 6. +5 129.5 10.6 119.1 92 SC 7. +4 129.5 10.2 116.6 90 SC 8. +3 129.5 9.9 121.7 94 SC 9, +3 129.5 10.2 116.6 90 SC 10, +2 129.5 10.5 120.4 93 SC 11. +2 129.5 10.6 119.1 92 SC 12, +2 129.5 10.7 120.4 93 SC 13. FS 129.5 10.8 119.1 92 SC 14. FS 129.5 10.5 117.8 91 SC 15, FS 129.5 10.6 120.4 93 SC 16, FS 129.5 10.8 119.1 92 SC 17. FS 129.5 10.7 117.8 91 SC 18. +3 129.5 10.6 119,1 92 SC 19 +2 129.5 10.5 117,8 91 SC 20, FS 129.5 10.8 120.4 93 SC \0 . ' . DATE: "--.-----. ~ - S1?ITF: SITE LOCATION PLAN PLATE: 2- '\ i / ,/ 'Wll'~ ,- ft;;J&l~/'IJ?l!;#i;If##, _ / rtiIJl1 ~r#il#1!:11 /-~. ----- ~ .---' ~-------~ ~~ fC- C;, ~' ~ a <tJ - ------.. / / I ;."," f o A' , 0 I "l- "'j" 5 " ~ I ( I,) '1',,:;-;: '~4_ , ~_- ,--=,. 0 , .,,' 0 , ." 0,., :,., 0'- o ::<i ~- o " . z"; '," ., n 45'156' a:r-. .~- " I,' '-1 LEGEND APPROXIMATE TEST LOCATION DATE: TEST LOCATION PLAN ~ -( ,.; .....J 'IJ ). fj ,-( f"~ - ( ~ I, '/' (I F ,(I: c'.J ~ ~ FIRE /- 140"(1 k .-/ --(12 " PLATE: co