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Home My WebLink AboutCT 72-15; GRADY PLACE; REPORT OF R VALUE TEST RESULTS; 1974-01-03INSPECTION • TESTING • RESEARCH • DEVELOPA1ENT 6280 Riverdale St .• San Diego, California 92120 fI Phone ',' ALL IIEPOIITS AlliE SU;U;';jTTED A. THIC CONI'"IDENTIAL PROPERTY 01" CLIENTS. AUTHOIIIIZATION ""0111 PUBLICATION 0,," OUIlt REPOIITS. CONCLUSIONS, 0111 EX'TIIIACTS, '1'1I0M 0111 IIIEGARDIHG THEM IS IIIESEIIIVED PENDING OUR WRITTEN A .... III0V-'\L AS A MUTUAL P"OTECTIOH' TO CLIENTS, THE PU.LIC AND OURSELVES., Mr. Oakley 'Parker January 3, 1974 '314 c:rlZ""~ GRADY PLACE 1050 Chinquapin Street, SCT 312:250 Carlsbad, California 92008 Report No. 2 SUBJECT: Report of ~lue Test Results,' Subgrade Material From Grady Place, Carlsbad, California. Dear Sir: In accordance with your request, we have sampled the subgrad~ material from the proposed Grady Place cul-de-sac off of Park Drive, Carlsbad, and returned the material to the lab for "Rfl Value testing. The material was tested in accordance with State of Californi~ 'Test Method 301. The material t.ested to have a;;' f'R" Val:l~e of 58, 'indica- ... -£4,t ting the need for a minimal structurai section. The fiR" Value curve is presented on the following Plate No. 1~ If you have any questions after reviewing our report, please do not hesitate to contact this office. This opportunity to be of service is sincerely app::t;ec'iated. Respectfully submitted, SOUTHERN CALIFORNIA TESTING LAB,. f INC. RAZ:bjl R. E. cc: (5) . Submitted (I) SCTL, Escondido / Cl72-/S ~. cr-~~~ .. RECEIVED ,JU~2 9 1913 . f CARLS6AO err'l o. d t)epartment Eng\neef\ nCt SOU THE R N CAL I F" 0 R N I ATE S TIN G LAB 0 RAT 0 R YIN COR P C' RAT E 0 6260 RIVERDALE ST. SAN DIEGO, CALIF. 92120 • TELE 260-4321 • P.O. 60X 20627 SAN OIEGO, CALIF. 92120 73-036 HIGHWAY 111 PALM DESERT, CALIF. 92260. TELE 346-1076 676 ENTERPRISE ST. ESCONDIDO, CALIF. 92025. TELE. 467-2662 June 14, 1973 Mr. Oakley Parker 1050 Chinquapin Avenue Car1sbad~ California 92008 Attention: Mike Straub SCT 312250 Report No. 1 . SUBJECT: Soil Investigation for Proposed Five Lot Residential Subdivision, Grady Place Near Park Drive, Carlsbad, California. Gentlemen: In accordance with your request, we have performed an investigation of the soil conditions at the subject site. We are transmitting herewith a report of this investigation. The analysis of our findings is intended to provide the required information to design the foundation and gra~ing plans for the proposed development. In general, we found the site to be suitable for deve1opment,pro- vided that the recommendations contained in the body of this re- port are followed. If you have any questions after reviewing our report,. please do not hesitate to contact this office •. This opportunity to be of service is sincerely appreciated. Respectfully submitted, SOUTHERN 'CALtFORNIA TESTING LAB., INC. CHC:j1e C. E. cc: (5) Submitted (1) SCTL, Escondido .. INSPECTION.· TESTING • RESEARCH • DEVELOPMENT 6280 R i v e r d a I eSt. • San Die go, C a I if 0 r n i a 9 2 1 2 0 Cl 'P h b n e 28 0 -43.2 1 ALL RE .. ORTS ARE SUIIMITTED All THE COH,.IDENTIAL .. RO .. ERTY 0,. CLIENTs. AUTHORIZATION "OR .. UIII:ICATION 0,. (lUR REPORTS, CONCLUSIONS. OR .EXTRACTII , ,.nOM OR REGARDING THEM IS RESERVED PENDING OUR WRITTEN A .... ROVAL AS A MUTUAL .. ROTECTIOH TO CLIENTS. THE .. UBLIC AND OUR5E~VES, REPORT OF SOIL INVESTIGATION PROPOSED FIVE LOT RESIDENTIAL SUBDIVISION GRADY PLACE OCEANSIDE, CALIFORNIA 1. PROJECT DESCRIPTION AND SCOPE Ttiis report presents the results of our soil investigation for the pro- posed five lot residential subdivision, Grady Place. near Park Boulevard in the City of Carlsbad, County of San Diego, State of California. A brief legal description of the site is Lot 24 of Park Manor Unit No. I, as per Map No. 6242. It is our 'understanding 'that one or two s.tory residential structures are planned for the site. It is further understood that maximum cuts in th~ order of 13 feet. and'" fills in the order of 8 feet are anticipated. The site configuration and test trench locations are shown on Plate No.1 of this. report. This soil investigation was undertaken to: a) Determine the physical properties of the prevailing soils including their supporting capacities, and settlement charac- teristics. b) Provide design information regarding site preparation and foundations. SCT 312250 June 14, 1973 P~ge Two 2. FINDINGS 2.1 Site and Soil Conditions The natural drainage on the site is primarily in the southerly direction. \ with elevations varying over a range of approximately 30 feet. A house presently exists on Lot No.4. All other lots are free of man.made struc- tures and/or vegetation. Loose fill, consisting of concrete sand, was noted in the area of Trench No.3. This fill is approximately 2 feet in depth and will be removed by the proposed site grading. In general, the prevailing foundation soils were found to consist of moderately to well cemented terrace deposit sandstones. 3 • RECOMMENDAT.IONS 3.1 Foundations 3.11 General: Conventional spread footings founded in nonexpansive soil are recommended for the support of the proposed structure. Conventional spread footings should be founded a minimum of 12 inches below the adjacent • finish grade, have a minimum~idth of 12 inche~"and may be designed for an allowable soil bearing pressure of 2.0 kips per square foot." Adjacent footings founded at different bearing levels should be so. located that the slope from bearing level to bearing level. is flatter than one horizontal to one vertical. 3.12 Expansive Characteristics: The prevailing foundation soils were found to be nondetrimentally expansive and will not require special con- sideration and/or design .. ..-..... --.-:-. .' seT 312250 June 14, 1973 Page Three . 3.13 Settlement Characteristics: Ant;icipated total andLor differential settlement may be considered negligible provided the recommendations pre-, sented in this report are followed. 3.2 Slope Stability The cut and fill slopes constructed from native on-site materials will be stable with relation to deep-seated failures if constructed at or flatter than 1.5 horizontal units to 1 vertical unit for slopes up to ,... 28 feet in height. 3.3 Earth Retaining Structures Active and passive soil pressures for the design of earth retaining struc- tures will be furnished by this office upon request if necessary for de- sign purposeSA 4. EARTHWORK Earthwork and grading contemplated for site preparation should be accom- plished. in accordance with the attached Recommended Grading Specifications and Special Provisions. Structural backfill should be compacted to'a . _'III. minimum relative compaction of 90 percent as determined by A.S.T.M. 1557-.,. 66T, Method A. 5. FIELD EXPLORATIONS Three subsurface explorations were made at the locations indicp,ted on the attached Plate No. 1 on June 6, 1973. These explorat'ions consisted of trenches dug by means of a backhoe. The explorations were conducted under the observation of our engineering geology personnel. I I I ; I ~ I ! , j l I . I ! 1 ~ , , "-:-_.-"--.'.:. ------.,..".' .. '-1 " SCT 312250 June 14, 1973 Page Four . The explorations were carefully logged when made. These logs are presented on the following Plate Nos. 2 and 3. The soils are desc'ribed in accordance with the Unified Soils Classification System as illustrated on the attached simplifled chart. In addition, a verbal textural description, the wet color, the apparent moisture, and the density or consistency a~e given on the logs. Soil densities for granular soils are given as either very loose, loose, medium dense, ~ense or very dense. The consistency of silts or clays are given as either very soft, soft, medium stiff, stiff,· very stiff or hard. Disturbed and undisturbed samples of typical and representative soils were obtained and returned to the laboratory for testing. 6. LABORATORY TESTING Laboratory tests were performed in accordance with generally ~ccepted American Society for Testing and Materials (A.S.T.M.) test methods or suggested procedures. Representative samples were tested for their nat- ural densities and moisture contents. The results of these,t.ests are presented on the trench logs. In addition, the maximum density and the angles of inte~nal friction andLcohesion were determined for typical and representative samples. The results of the tests are presented on Plate No. 4 o£ this report. . -. I , , , , I I j . -. PARK. c>R / Ve ... rRENCH LOC,t:}TloN SOUTHERN CALIFORNIA TESTING LABORATORY, INC. 6280 RIVERDALE STREET SAN DIEGO. CALIFORNIA 92120 PLOT PLAN 5 Lot Residential Subdivision Grady Place Car1sbaq, California BY DATE 6/12/73 JOB NO. 312250 PLATE NO. 1 r r , . . . ~TRENCH NUMBER 1 •• DESCRIPTION S,\1/ Reddish-Brown, Humid, Dense .. to SM Very Dense, SLIGHTLY SILTY, . SW/ SM WELL GRADED SAND TRENCH NUMBER 2 Reddish-Brown, Humid, Dense to Very Dense, SLIGHTLY SILTY, WELL GRADED SAND 6~~~~--------------~------~--- LEGEND: . ~: Sample Location Y: Natural Dry Density (pc'f) M: Natural Moisture Content (%. of , ,. Y M 117.7 5.8 115.3 6.8 115.9 5.0 Y) SOUTHERN CALIFORNIA TESTING LABORATORY, INC. 5' Lot Residential Subdivision . Grady Place 6280 RIVERDALE STREET 'Carlsbad, Californiq SAN DIEGO, CALIFORNIA 92120 TRENCH LOGS BY , MRF DATE 6/6/73 JOB NO. 312250 PLATE NO. 2 - ' ' , : -TRENCH NUMBER 3 e, CLASS DESCRIPTION Y 0 -. , , , , SW' Gray-Brown, . -. , Dry, Loose, WELL GRADED , . , " ," SAND (Fill) , 2 :J'i I', - 'I .. J, SW/ Reddish-Brown, Humid, Dense to -. ' 'j'·"l. SM Very Dense, SLIGHTLY SILTY, WELL ~ .. , '" GRADED SAND , :·rJ :1: 6i t·r·I:' -115.3 .. : t,·, : ~ : ~ :r:l): . :[ 'It: , 114.4 1 J.1. T· - FOR LEGEND SEE PLATE NO. 3 ., . SOUTHERN CALIFORNIA TESTING 'LABORATORY, INC, 5 ,Lot Residential Subdivision Grady Place Carlsbad, California 6280 RIVERDALE STREET SAN DIEGO, CALIFORNIA 92120 BY DATE M - 4.7 4.7 TRENCH LOG MRF 6/6/73 JOB NO. 312250 PLATE NO. 3 " -." 'r -. 1 -', '-'-''---~-..:...'' , i , ~ ~ , , , , , " > , , , !; " DIRECT SHEAR TEST RESULTS SAMPLE DESCRIPTION , Angle of CoheSion inte rna I intercept frictionC 0) (psf) Tl @ 3 - 4 Remolded to 90% 32 150 Tl @ 9 -10 Remolded to Natural 32 150 MAX,f\,1UM DENSITY & OPTIMUM MOISTURE CONTENT ASTM : .............. METHOD; ............ . SAMPLE DESCRIPT ION Tl @ 3 - 4 SOUTHERN CALIFORNIA TESTING LABORATORY, INC. 6280 RIVERDALE STREET SAN DIEGO. CALIFORNIA 92120 714·283·6134 TEST RESULTS Maximum Dens ity (pef) 1.30.2 optimu m Moisture CO!lt(Ofo) 9.8 5 Lot: R~sidential Subdivision Grh"dY. Place . " Carisba-d:~·. California ~ .. ;" :, I I t. r i I' 1· I r I BY MRF DATE 6/6/73 1 -'_---_____________ ... _ .. _ .. J.. _J~_.~-N-O-: .. --. .:::~:.;;:;1;,::,2.::.2 . .;:.5~0---.-.. -.,...1.-.. -.-. __ ~;;.~";.l.~;;:.~.;;.:~e;;;._ ... ..;;.~~r,~;;'..;'~:....;:-4,:....-.-.... ....,-.J --. APPENDIX A, PAGE 1 DATE ___ ;~6~/~14~/~7~3~~_ RECOMMENDED GRADING SPECIFICATIONS -GENERAL PROVISIONS GENERAL INTENrr: The intent of these specifications is to establish procedures for clearing, compacting natural ground,. preparing areas to be filled and p~acing and com- pacting f~ll soil to the lines and gr~des shown on the accepted plans. The recommendations contained in the preliminary·soilinvestigati'onreport and/or the att.ached special provisions are a part of the recommended grading, speci- fications and shali supersede th~ provisions contained hereinafter in the case of conflict. INSPECTION AND TESTING: A qualified soil engineer shall be employed to inspe.ct and test the earthwork in accordance with these specifications. It will be 'necessary that the soil I engineer or his representative provide adequate inspection so that he may certify that the work was or was not accomplished as specified. !t shall ,be the responsibility of the contractor to assist the ~oil enginee~ and to keep him appraised of work schedules, changes and new information and qata so that'he may make these certifications. If, in the opinion of the soil engineer, substandard conditions are encount~ ered, such as questionable soil, poor moisture control, inadequate compaction, , , -. adverse weather, etc., he will be empowered to either stop construction until 'the conditions are remedied or corrected or recommend rejection of_the _work. -. ~~ .' \ . . Soil tests used to determine the degree of compaction will be performed in -"accordance with the following American Society for Testing and Materials ...... " test methods: . ",' . Maximum Density and Optimum Moisture Content' -A.S.T.M. D-1557-'70., Density of Soil In-Place A.S.T.M. D-1556-64. ~ '~ . .., -. --;~ ... -• I~ - -, APPENDIX A, PAGE 2 JOB NO.·-3i22-S -DATE_' __ ~~/~' 1_,4~/~7~3 ____ _ ,--PREPARATION OF AREAS TO RECEIVE FILL: - _ Al~ vegetation, brush and debris shall be removed, piled ,and burned or other~ wise disposed of. After clearing, the natural ground shall be scarified to,a -.-,depth of 6", 'brought to the proper moisture content, compacted and tested for -- -the minimum density specified in the special provisions or the recommendations " cont~ined in the preliminary soil investigation report. When the slope of the lLC1:turaJ.=ground receiving :t:i+l exceegs 20% (5 horiz-ontal to 1 vertical), the priginal ground shall be ~teppedor benched. Benches shail . J =. :::e _ be cut to a firm competent soil condition. The lower bench shall be at least 10 f~et wide and all other benches at least 6 feet wide. The horizontal por~ -tion of each bench shall be compacted prior to receiving fill-as specified -hereinbefore for compacted natural ground. Ground slopes flatter than 20% shall be benched when considered necessary by the soil-engineer. --FILL MATERIAL: - Materials placed in the fill shall be approved by the soil engineer and shall be free of vegetable matter and other deleterious SUbstances. Granular soil shall contain sufficient fine material to fill the voids. The ,definition and -disposition of oversized rocks, expansive and/or detrimental soils are covered in the special provisions. Expansi ve soils, soils of poor gradat,ion or ~ strength characteristics may be thoroughly mixed with other soils to provide -satisfactory fill material, but only with the explic.i t consent of the soil engineer. , ' : ". ,~ .. , '.' r •• : ._ ,".-. '., .. , . •••• ':;.-".. :< ,- -PLACING AND COMPACTION OF FILL: ... ," ' .... -- ~~ Approved fill material shall be place"d in areas prepared to re'cei ve fill in· layers not to exceed 6 inches in compacted thickness. Each layer shall have a unif9rm moisture content in the range that will allow the compaction effort -APPEND~X A, PAGE 3 JOB NO. :.. . 312 DATE~. __ 6~/_1~i/~7~~ ______ __ .. ··to"be efficiently applied to achieve the specified degree of compact-ion. :. .. Each layer shall be uniformly compacted to a minimum specified density . -with adequately sized equipment, either specifically designed for soil . compaction or of proven reliability. The minimum degree of compaction to be achieved is specified in either the special provisions or the re- :. commendations 'contained in the preliminary soil investigation report • . . _.·'Field tests and inspections to check the degree of compaction of the fill _ will be taken by the soil engineer or his representative. The location ~arid frequency of the tests shall be at the soil engineer's discretion. In :'general, the density tests will be made at an interval not exceeding 2 feet ... : .in vertical rise and/or 500 cubic yards of embankment. -SEASON LIMITS: ~ill shall not be placed during unfavorable weather conditions. When work ~-is interrupted by heavy rain, filling operations shall not be resumed until :-the,:,proper moisture content and density of the fill has been achieved. Dam- ::.age 'resulting from weather shall be repaired before aC'ceptance of work. ~NFORESEEN CONDITIONS: ~n the event that conditions are encountered during the site preparation =and construction that were not encountered during.the preliminary soil in- :-vestigation, Southern California Testing Laboratory, Inc. assumes no respon- ::sibil'i ty for condi tions encou~t'~'red which diff-er from those conditions found . . ~nd described in the preliminary soil investigation report. ..... - : .: -~ . -" . .~ " i. . _ _."! .t~ • • • • • .' . .":-. . '.~. : . .,~ .. ," '.' . .... :1 ........ ~I . .. . ~<r-~ _, ••• .... _._ ., _.~w_ .. - --,.-.--> .. -'-~~-----~""""""'f' . ~ -:.:. -." .. ~ ~ ... -... . : f.. RECOMMENDED GRADING SPECIFICATIONS ---- SPE~IAL PROVISIPNS 1h~~imum degree of ~omRaption to be obtained in compacting natural ground and 'in the compacted fill shall be 90 percent. ,.,...,... ~tFim~tally eXEa~~~ve soils is defined as soil which will swell more than 3 percent against a pressure of 150 pounds per square foot from a condition of 90 percent density and optimum moisture content to saturation. O~s.ized fill material is defined as rocks or lumps over six inches in diameter. At least 40 percent of the fill soil shall pass through a No. 4 U.S. Standard Sieve. . .... ' . ". .;., ...... '.,' . . ..... . :' " .'.~ : .. ~~ < • ,:.:. ~. , '. '. : :~ ~.-j~ :':-: : ~ ; ~: : '0 • ': •• :~ • ". . ' .~ ~ "::', ." • • UNIFIED SOIL CLASSIFICATION CHART SOIL DESCRIPTION 1. COARSE GRAINED, More than half of material is larger than No. 200 sieve size. GRAVELS CLEAN GRAVELS More than half of coarse fraction is larger than No. 4 sieve size but sma ller than 3". GRAVELS WITH FINES (Appreciable amount of fines) SANDS CLEAN SANDS More than half of coarse fraction is smaller than No. 4 sieve size. SANDS WITH FINES (Appreciable amount of fines) 11. FINE GRAINED, More than half of material is smaller than No. 200 sieve size. SILTS AND CLAYS. Liquid Limit less than 50 SILTS AND CLAYS Liquid Limit greater than 50 HIGHLY ORGANIC SOILS GROUP SYMBOL GP GM GC' SW SP SM SC ML CL OL MEl CH OH PT TYPICAL NAMES· Well graded gravels, gravel- sand mixtures, little or no fines. Poorly graded gravels, gravel-· sand mixtures, little or no fines. ":1 Silty grqvels, poorly graded gravel-sand-silt mix.tures. . I Clayey gravels, poorly I graded gravel-sand, clay I mixtures. .! We:Ll graded sand, gravelly sands, litt.le or no fines. Poorly graded sands,gravelly sands,' little or no fines. Silty sands, poorly graded . sand and silt mixtures. Clayey sands, poorly graded sand and clay mixtures. Inorganic silts and'very fine sands, rock flour, sandy silt or clayey-silt-sand . mixtures with slight plast- icity Inorganic clays of low to medium plasticity,gravelly clays, s'andy clays, silty. clays, lean clays. Organic $ilts and organic .. silty clays 'of l.ow plasticity. Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts. Inorganic clays .of high· plasticity, fat clays. Organic Clays of medium to high plasticity. Peat and other highly organic soils. SOUTHERN CALIFORNIA ·TESTING LABORATORY , ; ! , 1 . , ,