The URL can be used to link to this page

Home My WebLink About; Lake Calavera Golf Course; Rippability Analysis; 1990-06-07RIPPlwLITY~YsIS PIumxEDmsL13pE -LAlzE~~ooLF~ -,- PREPAREDFOR: cityofcarlsbad Comnunity Developnent Department 2075 Las Palms Drive Carlsbad, California 92007 PREPARED BY: EbutkmCalifomiaSoiland~ting,~~raW Post Office Box 20627 6280 Riverdale Street San Diego, California 92120 - - -- - 4% T SOUTHERN CALIFORNIA SOIL AND TESTING, INC. 6280 RIVERDALE ST. SAN DIEGO, CALIF. 92120 ’ TELE 280-4321 l P.O. BOX 20627 SAN DIEGO, CALIF. 92120 678 ENTERPRISE ST. E 8 c q N D I D m. (: A L I F. 9202.5 * TELE 745-4544 June 7, 1990 City of Carl&ad CcmnunityDevelo~DeparQent 2075 Las Palmas Drive SCSEiT 8921130 Carl&ad, California 92007 ReportNo. 2 EXJBJJICT: Rippability Analysis for Proposed Cut Slope, Lake Calavera Golf Course, Carl&ad, California. REFERENCE: "Report of Gectechnical Investigation, Calavera Lake Golf Course, Carl&ad, California," Southern California Soil and Testing, Inc., Report No. 1, October 4, 1989. Gentlemen: In accordance with your request we have perfo& four seismic refraction traverses within the area of the proposed cut slope. The findings of our survey and the locations of the seismic traverses are presented herewith. If you should have any questions regarding this report, or if wa IMY be of further service, please do not hesitate to contact this office. This opportunity to be of professional service is sincerely appreciated. Respectfully subitted, P R. High, C.E.G@237 JRH:ItlW cc: (6) (1) sulanitted SCS&T, Escondido -- SOUTHERN CALIFORNIA SOIL AND TESTING. I N C. - - - Introduction ............................................................... 1 Findings ................................................................... 1 General ........................................................... 1 Seismic Traverses No. S-l through Traverse No. S-2R ............ ...2 Seismic Traverse No. S-3 through Traverse No. S-4R ............. ...3 Rippability Characteristic of Granitics ........................ ...3 Riple Condition (O-4,500 Ft./SW.) ..................... ...3 Marginally Rippkble Condition (4,500 Ft./&c.-5,500 Ft./Set ..4 Nonrippable Condition (5,500 Ft./Set. & Greater) .......... ...4 Seismic Traverse Limitations ...................................... 5 - Plate 1 Plot Plan Plates 2-5 Seismic Traverses Plates 6-7 Rippability Charts - - -- - - SOUTHERN CALIFORNIA SOIL AND TESTING, INC. 6280 RIVEROALE ST. SAN DIEGO, CALIF. 92120 ’ TELE 280-4321 ’ P.O. BOX 20627 SAN DIEGO, CALIF. 92120 678 ENTERPRlOE ST. E 9 e D N D I D 0, c * L 1 F. 92D23 - TELE 745-4544 sEIsMIcsuRvEpmRIPP~ILITY-srIcs L?%JZCAL?WERACOL,FCOURSE The intent of the seismic refraction survey was specifically to facilitate the project planning by determining the variation in seismic velocity of the underlying materials and to determine a reasonable approximation of the depth from the surface to the boundaries between rippable, marginally rippable, and nonrippable bedrock. Four seismic traverses were performed by our firm in May 1990. These traverses were positioned within the area of the proposed cut slope as indicated by Mr. Dan Clark. The seismograph's depth of investigation is closely related to the length of the seismic traverse. For a particular length of traverse, e.g., 100 feet, using a ratio of 3:l between length and depth, hi conclude that this length of survey line will detect the boundaries between materials of varying density and velocity to depths ranging to approximately 33 feet. The maxinnun length of traverse in this survey is 100 feet, which should reach a depth of approximately 33 feet. FIMJIXS QZWW,: The results of our seismic traverses indicate that the nWerials are nonrippable to the proposed depths and blasting may be necessary. The SOUTHERN CALIFORNIA SOIL AND TESTING. I N C. SCE&T 8921130 June 7, 1990 Page 2 results of the seismic traverses are presented below and on Plate Nurbrs 2 through 5 and the locations are indicated on Plate Number 1. The apparent velocities were measured at both ends of the seismic traverses, and the seismic traverse performed in the opposite direction is designated as Nmber R. &parent Velocities Cammks ft/sec. ' No. S-l ProposedCut: 35 feet O'-11' +ll' Traverse ND. s-IR O'-11' +ll' - No. s-2 Proposed Cut: 25 feet O'-11' +ll' - ND. s-m 0 I, 6’ 6'-21' +21' 3,900 Rip@le Topsoils and Weathered Granite with Ha&rock Floaters 12,000 Nonrippable Granitic Bedrock 4,000 Rippable Topsoils and Weathered Granite with Hardmck Floaters 14,000 Nomippable Granitic Bedrock 2,800 RippAle Topsoils and Weathered Granite with Hardrock Floaters 12,000 Nonrippable Granitic Bedrcck 4,000 Rippable Topsoils and weathered Granite with Hardrcck Floaters 6,000 Nonrippable Granitic Bedrock 10,000 Nonrippable Granitic Bedrock SCS&T 8921130 June 7, 1990 Page 3 Apparent Velocities Cmts ft/hec. TraveJcse ND. s-3 ProposedCut: 35 feet 0 I, 8’ 8'-16' +16' - ND. S-3R 0 I, 9' + 9’ Traverse ND. s-4 ProposedCut: 20 feet O'-13' +13' 2,500 Rippable Topsoils and Weathered Granite with Hardmck Floaters 8,000 Nonrippable Granitic EMrock 14,000 Nonrippable Granitic Bedrock 2,000 Rippable Topsoils and Weathered Granite with Hardrock Floaters 12,000 Nonrippable Granitic Bedrock 3,500 Rippable Topsoils and Weathered Granite with Hardrock Floaters 8,000 Nonrippable Granitic Bedrock !bzmxse No. S-4R O'-16' +16' 3,300 Rippable Topsoils and Weathered Granite with Ha&rock Floaters 12,000 NomAppable Granitic E&rock RIPPABILITY UURACXZRISTIC OF GRANITICS: The following describes the rippability characteristics of granitic reek materials in regards to the velocity of soundwaves through the rock. FUPPIWE aJJ!mTIm (O-4,500 Fl!./mc.): This velocity range indicates rippable mterials which my consist of decoqosed granitics possessing random hardmck floaters. These materials will break down into slightly SCS&T 8921130 June 7, 1990 Page 4 silty, well graded sand. %te areas may contain localized hardrock areas and may present utility trench problm. Further, large floaters exposed at the cut surface may present additional problems with potential hazards due to rocks protruding from cut slopes. Materials within the velocity range of from 3,500 to 4,000 fps are rippable with difficulty by backhoes and other light trenching equipment. MARGmy Rl.Pl?AELlE axaxcTIoN (4,500 FT./SEC.-5,500 Fr./?xc.): This range is rippable with effort by a D-9 in only slightly weathered granitics. This velocity range may also include numarous localized hardrock floaters with the possibility of extensive areas of fractured granitics. Excavations rray produce material that will partially break down into a coarse, slightly silty to clean sand, but IMY contain a high percentage of +1/4" material. Less fractured or mathered materials may be found in this velocity range that would require blasting to facilitate removal. Materials within this velocity range are beyond the capability of backhoes and lighter trenching equipnt. Difficulty of excavation would also be realized by gradalls and other heavy trenching equipment. NONRIPPABIE ~ITION (5,500 Fr./?sExz. & GI2lwIm): This velocity range includes nonrippable material consisting primarily of moderately fractured granitics at lower velocities and only slightly fractured or unfractured rock at higher velocities. In its natural state, it is not desirable for finish grade due to the lack of fines and the highly fractured material resulting from cuts within this rock. Blasting in granitics will produce oversize material requiring special disposal consideration. This upper limit has been based on rippability with a Caterpillar D-9 using a conventional #9 single shank ripper. However, thisupperlimit SCS&T 8921130 June 7, 1990 Page 5 - _- - of rippability may some times be increased to 7,000 to 8,000 fps material using the D-9 mounted #9 Series D Ripper or other heavy excavation equipment. The rippability index presented above is a mxlification of charts prepared by the Caterpillar C!orrp?any and an article in "Road and Streets", September 1967. Also included as Plate Numbers 6 and 7 are rippability charts from the October 1986 Caterpillar Performance Handbook. It has been our experience that many of the local contractors cannot achieve the rippability levels as indicated in the 1986 handbook. These charts are presented as potential guidelines for planning the proposed project. SEISMIC TRm?EsE L0ECZWIQG: The results of the seismic survey for this investigation reflect rippability conditions only for the areas of the traverses. Howsver, the conditions of the granitic materials appears to be similar for the remainder of the area of the proposed cut slope and may be assumed to possess similar characteristics. Our reporting is presently limited in that refraction seismic surveys do not allow for prediction for a percentage of expectable oversize or hardrock floaters. Subsurface variations in the degree of weathered rock to fractured rock are not accurately predictable. The seismic refraction method requires that materials become increasingly dense with depth. In areas where denser, higher velocity materials are underlain by 1-r velocity materials, the 1-r velocity materials mid not be indicated by our survey. All of the velocities used as upper limits for rippability are subject to fluctuation depending upon such local variations in rock conditions as: a) Fractures, Faults and Planes of Weakness of Any Rind b) Wthering and Degree of Decwsition Cl Brittleness and Crystalline Nature d) Grain Size SCS&T 8921130 June 7, 1990 Page 6 It should be noted that ripping of higher velocity materials my became totally dependent on the ti..m available and the economics of the project. Ripping of higher velocity materials can be achieved but it my becom economically infeasible. - - r- - - - o 40 80 120 LEGEND I I 1 SEISMIC TRAVERSE LOCATION c?!%’ EXISTING TOPOGRAPHY &% PROPOSED TOPOGRAPHY *OUTnlRu CALICORWIA SOIL & TIRTlWQ, INC. ,y JHlWDW DITt: 6-m-m JOB IUYBtl: 6921130 PLAE 41 N: I ! I I I 1 1 I I 1 _ _ la0120 60 150 lo0 50 120 00 40 906030 604020 nil 1 I 30 60 90 120 150 180 210 240 DISTANCE d 10s Lake Calaveras GEOLOGIST JH/MH SOUTHERN CALIFORNIA SOIL &TESTING, INC. JOB NO. 8921130 315 ELEVATION ~ S-l TRAVERSE NO. ~-~ _-~- .-~ SURFICIAL MAT’L. TR !, lRSE TYPE _~~___ ROCK TYPE __ -u iif iif oz: . T w f I DISTANCE d 10 20 30 40 50 60 70 80 90 100 20 40 60 00 100 120 140 160 180 200 _-- 1 30 60 90 120 150 100 210 240 270 300 0 4 FOlfTIfERN CALIFORNIA SOIL &TESTING, INC. JOB Lake Calaveras- GEOLOGIST JWMH .__ .._ JOB NO. 8921130 TRAVERSE NO. ‘-’ - ELEVATION ~ 335 ft. SURFICIAL MAT’L. Silty Sand TRAVEKSF. TYPE Kqr ROCK TYPE PlatP Nn ? / I f I ‘- / I -----r-r~--T- I 1 150 wo so 120 60 40 906030 604020 20 30 40 50 60 70 60 90 100 40 60 80 loo 120 140 160 180 200 1 30 60 90 120 150 180 210 240 270 300 DISTANCE ___) JOB Lake Calaveras ..____ GEOLOGIST JWMH - _-_ "!ii~.~JIJTiTmTr! i / 4 ! 1 : ; f---i ! 1 : ; i z.tJ.j ! j ! ;; ; / ;&.&j 1 I 1 j i I 1 j j / Ft-~'-'~TfTttttttiJ.] --+- tiiii+++-+tT I!li ir / '1,/l I,":" ,I --,I * 11 a1 1 (-u 8 I --* -- i-c ib 18 ---T*--- __-.-..- - -ji!]l$!’ f..,:. Qq---m .. *!I, j’ ,, >- . t-f t : I', I.' ; k+-+-~~--~ -++k I+~+ t-l-~~~-Lt-...ijllCttSi..'rit-it:-': :I:!! I I, ,,.,, ,..,,,.I, ,,. .~~~TI-&j i 1 ,, 'I, : I : : '+ ! 1 'I ,!/,I,/.( II ,1 -..*------ Ii l/!lI I: ‘!I/.! :I i: I, : I’IIII: IIIII, _: :,: ~+i-I$&;,:~~ /I <,: A 1: ! II I ----- , :Q 1 i i ~~~~~~~~~~~~. II II IIII,, I!, II 4 t I , I I II 1; 11 1 II (I! I i 1 / I ( 2 I ‘L- f-i’ -+;‘j’:‘;i’,“,.“’ ,.I 1 I jLL+“.+ -+CL.L+Lyt 1 / 1 j t ,, ,,‘,‘I;‘, / / , ,, / I : I I : 1 : _ -- I I -.- ~--Lb - :: I tIIi,I .&A+-+ I !! :, c; ;I!! :i; I.! I ,.j- SOUTHERN CALIFORNIA L SOIL &TESTING, INC. JOB NO. 8921130 320 ft. ELEVATION -_ TRAVERSE NO. s-3 SURFICIAL MAT’L. Silty Sand _. TRAVERSE TYPE ROCK TYPE _ Kgr- 2-b. 1 n1-%+m r-In n ,I /, Iii,,, !/‘I, I’ ““]i,,’ ; ‘!I ji 1 ‘- I i j ; ; +&pJ...&/ / j i 1 1 ‘-+I j I / 1 I ~+q$&~ I I i/lJ~j1-i;~~::+LL~: +-I--+f + i1!!‘:I:i-~~-C!-i-~,~j:“*L”’ I’ 1-1 I I 1 i~.-__I 1 --~- ‘; -I-d 2 I T I : i ? LIL: : ; 'i'"r-lij;:i!,-,ii,::jii;." "' il-Lm , .- 5 / I 1 : I I -_.L- I:TT11-:-1 ILILiLilL 1-Li-L-LL:_i~. 1 IlI!I!rYdlII’IIIIL.LL : j i rfr: I i I iii-z1 1 [fj I I 1 1 I 1 1 1 I i I I -I I ! I I I I tt+wt-ti-m&t-t-1-1 I t#m F i i f i i j 1 i I ; i i j i..L.cec, *._ : I,,, , ,,1,,, ‘---F--++*~]~--Jysq ] I!.: ll....!l. ..,I.!. ., II ,*, 10 20 30 40 50 60 70 80 90 100 20 40 60 80 100 120 140 160 180 200 _-- 1 30 60 90 120 150 180 210 240 270 300 DISTANCE d JOB Lake Calaveras GEOLOGIST JH/MH _ SOUTHPRN CALlFORNIA SOIL &TESTING, INC. JOB NO. 8921130 ELEVATION ___ 300 ft. TRAVERSE NO. s-4 ______ SURF ICIAL MAT’L. SM TRb’!f [<SE TYPE ROCK TYPE Kgr. Plate No. 5 D8L CATERPILLAR PERFORMANCE HANDBOOK Edition 17 October 1986 Selsmlc Velocity Foot Par Sooond x 1000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 i I I I 1 TOPSOIL CLAY IGNEOUS ROCKS GRANITE BASALT SEDIMENTARY ROCKS SHALE SANDSTONE SILTSTONE CLAYSTONE CONGLOMERATE METAMORPHIC ROCKS SCHIST SLATE I / , / / 1 1 RIPPASLE MAROINAL NON-RIPPABLE 1 I D8L Ripper Performance l Multi or Single Shank No. 8 Ripper * Estimated by Seismic Wave Velocities SOUTHERN CALIFORNIA . LAKE CALAVERAS GOLF COURSE SOIL 8 TESTING, INC. BY: JH DATE: 6-13-90 JOB NUMBER: 8921130 Plate No. 6 D9L CATERPILLAR PERFORMANCE HANDBOOK Edition 17 October 1986 Selsmlc Velocity foot PW 800on4 x loo0 0123456789 10 11 12 13 14 16 IGNEOUS ROCKS SEDIMENTARY ROCKS SANDSTONE SILTSTONE CLAYSTONE CONQLOMERATE METAMORPHIC ROCKS NON-RIPPASLE D9L Ripper Performance + Multi or Single Shank No. 9 Ripper + Estimated by Seismic Wave Velocities SOUTHERN CALIFORNIA LAKE CALAVERAS GOLF COURSE SOIL 8 TESTING, INC. “: JH DATE: 6-13-90 JOB NUMBER: 892 1130 Plate No. 7