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HomeMy WebLinkAboutm16830109Engineering Geology Soil Mechanics Foundofion Studies 19720 Wenftira Soul. yard — ! oor;land €-fiNs C ilifor nia 91364c , is 213) 346-0565 — (213) 873-7332 November 5, 1970 1-6 8-301-09 E. L. Pearson and Associates 1551 West Redondo Beach Boulevard Gardena, California 90247 Attention: Mr. Garry Vander_ Wende Subject: Final As -Graded Geologic Report, Rough Grading Completed, Tract 30578, Diamond Bar, California Gentlemen: i+1, ,rn mar].rn nr?r4.^].0 i - - L jest tract during grading, as require: by the County of Los Angeles. Rough grading of the tract is now completed. This report presents our opinions resulting from these inspections and supplements our prior reports. Enclosed is the final As -Graded Geologic Map and selected cross -- sections. Cross - sections have been revised in those areas where major design changes have occurred during the progress of the grading. The revised sections reflect both the original design and the final grading configuration. The final compaction report will be forwarded under separate cover. Loring Logs A through X, drilled during construction of the tract have been included with this report.. The following reports have been submitted in conjunction with the development of this tract: l L. Pearson. & As8ociates 1-68-301-09 i November 5, 1970 Page 2 r 1 DATE JOB NUMBER SUBJECT 1/13/69 68--301 Grading Plans 2/3/69 68-301A Addendum Geologic Report, Grading Plans 3/21/69 68-301D Grading Plans Addendum 3/21/69 68-301C Supervised Compaction Report, Pavillion Area 3/24/69 68-301D Geologic Report, As Graded Pavilion and Parking Area Sites 3/24/69 68-301E Geologic Report, As -Graded Sales Office Site 3/25/69 68-301F Geologic Report Pavilion Area and Sales Office Site 3/26/69 68-301G Additional Data 3/27/69 68-301H Graded Slopes South and East of Pavilion Site 3/31/69 68--3011 Addendum Supervised Compaction Report Sales Office 4/4/69 68-301L Addendum Geologic & Soils Report Lots i 4/5/69 68--3011s Addendum Report, Fill Slopes 4/1_0/69 68-30111 Addendum'Geologic & Soils Report Proposed Model Lots 127 & 135 4/10/69 68-301N Filled Ground Report 5/l/69 68-3010 Design of Fill Slopes 5/8/69 68--301 MR-1 Monthly Report "1 5/12/69 68-301P Alternate Design of Shear Treys 5/23/69 68-301Q Addendum Report 5/27/69 68-3.01R Redesign of Proposed Grading 5/28/69 68--301S Additional Soils Engineering Information Lots 170-176 y 6/17/69 68-301 MR--2 Monthly Report No. 2 7/8/69 68-301 MR-3 Monthly Report No. 3 Geologic 7/11/69 68--301T Lot 135 7/15/69 68-301U Addendum Report Lot 135 8/28/69 68--301V Redesign of Proposed Grading, Lots 46-49 7/28/69 68-301W Lot 135 8/15/69 68-301 MR4 Monthly Report No. 4 E. L. Pearson & Associates 1--68--301-09 November 5, 1970 Page 3 DATE JOB NUMBER SUBJECT 8/25/69 68--301SMR-5 Semi --Monthly Report No. 5 9/10/69 68-301Z Redesign of Proposed Grading Lots 68-69 9/11/69 68-301SDIR-6 Semi -Monthly Report No. 6 9/22/69 68-301Y Review of 5:1 Cut Slope North of Pavillion Site 9/23/69 68-301-OOSMR-7 Semi-monthly Report No. 7 10/8/69 68-301-OOSMR-8 Semi -Monthly Report No. 8 1/9/70 68--301-OOZ Supplementary Report, Lots 68 & 69 10/20/69 68-301--OOAA Redesign of Proposed Grading Lots 59-62. 10/22/69 68--301-OOSDIR--9 Semi -Monthly Report No. 9 - 10/30/69 68-301--00SMR-10 Semi -Monthly Report No. 10 11/5/69 68-301-00AB Redesign of Proposed Grading Lots 50--55 11/7/69 68-301SMR-11 Semi -Monthly Report No. 11 11/10/70 68-301-OOAC Supplemental Geologic and Soils Report, Lois 59-62 12/11/69 68-30.1-OOSDIR--13 Semi -Monthly Report No. 13 12/23/69 68-301--OOSMR-14 Semi -Monthly Report No. 14 i rf1 3nI v sr_..yC y.. ++14 R t Tl r._i rL 1/12/70 68•-301-01 Geologic Report Lot 81 1/27/70 68-301-00SMR-16 Semi-Mon'Chly Report No. 16 2/2/70 68-301-04 Compaction Report, Lot 135 2/2/70 68-301-04 Geologic Report (Rough Grading Completed) Lot 135 2/5/70 68--30.1--04A Addendum Report, Lot 135 2/27/70 68-301-02AD Additional Information Steeplechase Shear Keys, Lots 23-30 and 170-176 2/5/70 68-301-04B Addendum Compaction Report Lot 135 2/24/70 68--301--03St•IR-17 Semi -Monthly Report No. 17 3/6/70 68-301-03SP•%R-18 Semi -Monthly Report No. 18 j 3/26/70 68-301--03SMR-19 Semi -Monthly Report No. 19 4/7/70 68--301-03SIAR-20 Final Semi -Monthly Report No. 20 5/4/70 66--301-07 Study of Soil Cement Mixtures 5/11/70 0-0153-00 Final Geologic Report Lot 1.48 5/12/70 0-0153-OOA Foundation Enqr. Report Lot 148 7/22/70 68--301--12 Addendum Geologic ]report (Rough Grading Completed.) Lot 81 8/17/70 68-301-12 Lot 81 Mayes 8/20/70 68-301--12 Inspection Report Lot 81 MayesGeologicIns Robert Stone Associates6:y: i L E. L. Pearson & Associates November 5, 1970 CONCLUSIONS AND RE=WENDATIONS General 1-68-301-09 Page 4 1. From a geologic standpoint, the subject tract is favorable and has a safe building area on each lot. Additiorxal,,geo- logic review will be required in those instances where a grading permit is required or in special circumstances where unusual building design warrants this review. General foundation recommendations for each lot will be included in - the "Soil Engineering Report on Compaction Testing". 2. The geologic recommendations which we made have been followed. Cut Slopes 3. The cut slopes on the subjecE: tract will perform in a satis- factory ma nn r . Future cut ~-lopes propoc:• d or ind.ividual lot development should be reviewed by an e'rigino^ring geologist if they exceed three feet iri vertical height. Cut slopes which would undercut bedding or disturb existing stabilization measures as shown on the final "As -Graded" Geologic Map should be avoided. Restricted Use 4. Restricted -use areas have been established on Lots 15--17, 35-43, 46-55, 58-69 and 168-181. The revision of the restricted -use, line on Lots 42, 43 and 46-50 was necessary when additional data concerning the limits and depth of Qls-4 were obtained. See the As -Graded Geologic reap. Lots 187 and 188 may require restricted --use areas on comple- tion of a geologic investigation. A complete geologic investi- gation will be necessary prior to any grading operation on these lots. obep f Stone & Associattes, si F. L. Pearson and Associates 1-68-301-09 November 5, 1970 Page 5 Shear Keys and Buttresses 5. Shear keys have been constructed on Lots 47-55, 58-69 and 170-176. All shear lr.ey rer.ovals were inspected and approved by an engineering geologist prior to the placing of compacted fill. 6. Buttress fills have been placed along Steeplechase Lane adja- cent to Lots 11, 12 and 15--18, Lot 44 adjacent to Rimfire Lane and also along Wagon Train Lane adjacent to Lot: 70-74 and 76-80. Subsurface Drainage 7. Subdrains have been placed in all shear keys and buttresses except in the buttresses along Steeplechase adjacent to Lots 11, 1.2 and 15--18. The height and key -width of the i E 1 i1cC liu5 uii lJill.L1VJJ 7 did Ilot drains; however, paved drainage terraces have bean placed on top of the buttresses at the natural -fill contact for the removal of water ,From the buttress area. Subdrair_s have been placed in canyons beneath fills in Lots 104, 105, 109, 110, 113-115, 123 and 124. All subdrains were inspected by an engineering geologist and soils engineer.pri_or to placing compacted fill. Canyon k'illinu and Preparation 8. Fill has been placed in canyon bottoms in Lot 15-adjacent to Steeplechase Lane; Lots 19-21, 74 and 75 east o3 Wagon Train Lane; Lots 87-89 adjacent to Roelcy Trail Road; Lots 103--105 i between Kicking Horse Drive and Rocky Trail Road; Lots 108-110 Robt,t S#once Associates r Y E. L. Pearson & Associates November 5, 1970 Page 6 adjacent to Wagon Train Lane; in the arna of Lots 111--117, 123- 125 and 162-165, and porLion^ of La2y Meadow Drivo. See the supervised compaction report for -Lest results and foundation recommendations. 9. Canyon clearot. is were individually inspected by an enAineering geologist prior to the placement of fill. Slade Removal. 10. The upper portion of landslides was removed and recongacted on Lots 47--49 helow Wagon Train Lane, Lot, 77--79 above Wagon Train Lane, and Lots 24--27 above Steeplechase Lane in. order to provide a stable building site. Se*care Disposal 1. 1ho tract will _- i_i zti _ _ ..C']" _ .:1 ..D 'I_?"1C' p•'CPpi:i C`SZ [,f the force main excavation between Lots 155 and 156, sewer_ alignnents constructed along; easements Were mapped and insperL d by an engineering geologist prior to back.filling. The force main excavation has not been made as of this date. The information obtained in our inspections is shown on the attachod Geologic Map. The sewer alignments inspected to date are geologically favorable for the intended use. We will inspect and roport on the force main excavation aL- a later date. Offsitc Grading 12. Of_fsite grading completed in conjunction with adjacent tracts shall. be reported with those tracts except where this grading extends into Tract !0285. t 4 E. L. Pearson & Associates 1-6-3-301--09 November 5, 1970 page 7 Planting 13. We recommend that the compacted fill slopes and cut slopes which dxpos2 deep soil cover be planted as soon as practi- cable to mu-n ze erosion, Deleted Canyon .F ill 14. A canyon fill_ showii between Lots 39 and 43 on the ori- inall7 Y approiTed grading plan, Was deleted during construction. This fill was never on the base map for our geologic. r:ns and is not requ_L.red from a geologic viewpoint. Very truly yours, ROBER T STONE & ASSOCITsTES , INC. Monte E. Ra_,,,, Engr. Geologist r And By-; f/`` 1% ' r I . - - — P.obert Stone,Th.D; , re i I MER/RS:caa Enclosures: Geologic Ma) Sheets lA-7A Cross Sections: B-2, G, J, 0 Boring Logs: A-X Distribution: 4 Client 2 County of Los Angeles l Dept. of Pld(; . & Safety; 1 Geology Section) 1 10 3. - - ,. r- 11 _ -:,: •CRAA — EXPLANATION: "' c nd s: Z, c Y• er..lcci-- Lndrshai.e y Slake and dip of beddrrg (recorded di r+nq grads .) s. m•csur...c.c'.: s were r of L2C7Qin, recorded durrna oreg:rul inveslrgalionf v:.:Kr7Je p:Ls., M --L4 r,d f bedding, .;,;,coined frc,n tfike a Strikea and dp eof rc, _ rr snar ptanv. i B2ion of . uc,ca: c gcr ooriny- 1 6, f ing 3r -, .r surf ace a'dn a r. ,' Tc .cr. . y Mr 1 ba ;r,g / ,'Moore a Ba wh.+ know pigerehj strike and dip mC s.rE . :_s erg .:.a 4 3a-: Kho D or Dulldo! er french Coatac t. mmm xaar. m . fL N - . Cc. -?tact, approximatelY loco=• i _ t LoFations of Cross Section included in GEOLOGIC MAP 4 by ROBERT STONE & ASSOCIATES, INC. I-68- 301-09 19720 VENTURA BOULEVARD i` 4 WOODLAND HILLS, CALIFORNIA 1- 55_ N - _ ro . ooa .. SEE .. = SSOC.IAT- E-S L. 'PEARSON ..... A F aNI, V IYL LE N G 1 N E R 1 N G .: _ L" A N D 4G0 w:,s- r-.,-*-nafrn=-AARF1 Nnz'CAL flRJ`41 1.`-:-:.:+.. t- ................... ProIECT; -..-Di.arcion-d ... Bar ........ ....................... ..................................... ................................................................................. ..... .................. ......... mothod of -2.4 ....... Pul, c. k et ... A.uger .................................. Loc;ged 'by P E /M. E . R [of" T. No . ......... Ground :Ievcifion: ..... Location: tc e Ma's Date Observn.& I........................ ........ e ' Soil Tesi Doscrimtic-i-I 0 2U- 1 K' I r, 7Tan SANDSTONE and occasional silts - tone and shale interbeds s lightly iuoist, fractured) Z 15 E- W 101 on SILTSTON11].- bad Primarily SANDSTONE hear Plane in siltstone 4 Tar in SILTSTONE bed Shear plane, thin N201q, nearly h o r i z on ta 1 (curved slicks strike nor- L Total Depth 36 No water No caving 11) gk- y 0 5. 15- 2U 25 30- 1 -A f ti qSLSI-5'5.F:Z'AC WITr`--Se No._ ............................... FROJECT...... Di_ mP.n.d Dar Method of Driliin 24 Bucket huger tonged by P. • E . /11. E. . R.3o Cio............................... ............. r:................................................ Ground Elevation: gG2 are ibs*rved:caos, h\C, e `Vh \, `Q Q44i JL`4h Q Description Sail Test Tan to brown SAIQIDSTONE with occasional ---- a si lts tone interbecls1 rY. 3' -180 north dip Dark grey to black interbedded SILTSTONE and SANDSTONE 13' N-S, 17 E on shear plane r Total Depth 16' No water - No caving a 5 30 2U i'-':, .).i . .,..r• .+ 4: ...... .. .r .ice.,; ..s- _. a . r a -`.s .-+`5..' J G:., .. .t 1 i, P. E. M E. R. f -3plNicthndnrpillisg:.2.!......,1;i.G.M...113.......................................Long, d L,; . . / . Jnh lc........7.s..............................,. Ground Me5ation:.... 0.80 Lccuiin7: Sep _T.aap Dale Observed: 0 fG.C) toil Test Predowinantly tan SANDSTONE with 4;} SILTSTONE in terbeGs j, vy a t; 3' - N20T, 500VW on 6" siltstone bed in sandstone, fractured - some open Jt F Fa ac-I Open fractures to 1./2" , roots in SANDSTONE Crushed, fractured She 6r nlaIe with some roots N60 W, 16 ME Flack unoxidi2ed SZLTSTOItiE with SANDSTONE inWrLnds (slightly moist, fi ry, continuous, tight bedding 065-W, Wh Total Depth 26' D..................... Diai,.iond Bar I .... "I ..................... ................ I ............. ....... . ...... - ...... ........................... ............ ......... ....... . ......................... PIAM r, E, E, R. ACI......6.58'.7. 3. 0MbodoFDAMnwMM. J ................ ppy. M.a.p ............................. ........ ........ N 4 S61 M nterbedded SILTSTONE & SAARIONE 41 slightly moist to dry, fractured 0 fairly tight) jj 30 3 LI SRI, adding N60 0 E, 15 0 SE in Silts -tore AADSTONE terbcdded SILTSTONE and SANDSTONE This sliced clay , shcar plan , N35 W, 17 WE slicks strike N20 G E Interbeddod tand and brown SAADETONT,' and SILTSTON& (slightly moist. tight, continuous bedding) Bedding U30 0 W, 18 HE Totol Dopth 39' 7 -r) , 2 c GIiILn.Lc-d b o.............. 65. 6-3..-.3.0-1 .......... - Ground 1-1ovo ionn—PA! A. ..neen I W." . . . . ........ .............................. Obstrved:-,... 61 o' i- Description OtiT rk -11. TOPSOIL: Dark brown silty CLAY lAR, firm) becomes sandy with depth. Some open pores below 61. SUBSOIL: Silty clay soil with blocks of shale and sandstone SLIDE DEBRIS: Discontinuous bedding. 9ILTSTONE blocks with streaks of MOW CMQWr 1 131: N554,130E I Some SANDSTONE beds starting at 131 19': Thin bedded SILT ;TORTE (clayey, moist) N10 0 E,9 0 SE Bedding discontinuous for the most part. L Si PLANE. E—'1v I Direction of lineation of slicks NUE, plane active with offset of V in hole 321: Water table and qg,qqe 1 '; F3 11, 6 - "" ' -- - - ; - U-11 -' N--T- - E-' - -F- - 0-- A` -, I T - " P ": 0 ThiBedded gr,--FE! --','!-ack 611LTSTON n39': ( slide Plane) Tight contorted bedding, N50 0 W, ConLi nuea u id aW. [..- e..1` [.i.+ J `. ....,.. •F. . !1 f3 .:..a• : t' , : - Cx. ` .ar 5; +S + .x 5 r.. ..:7 COrl'-illued) i3P?OS CT:........Di pond,..Bar...................................................................................................................................................................................... 24" ]3uc~k.=t--au.ger GH GS--3U1 P•Aulbod of Drilling: .........................................................Lorenod wir Job, NO. ............. ............................. r ground Llevcs4;o: 94` ...............ioca'riozs. } '.c' Iqa—,) .Data Observed: 6/4/69,...._.. 0i: rli - 45-1 je[ Y i 3 t{ BEDPOCK: r_UENTr 1<+- ',ATTON (Cc), t-:_iluec).) Bedrock, hroucjht- out o' fLIia ll,.)I.e be -low 32' . Thin DC(Ided gray to hlack saJ_tstone and cir. riscciiurl sandston Total D(--JDti1 51 ' . Near_ refusal, no caving. 1'v '.-u 1c ,.,-`_-.. ' [+sirs try -•I-rsr lovel and activity oF- the s1a.do. r;l::.-nc. DATA, ......... I ........ 1- .......... ROJEM _Rlpmond Bar t ...... ...................... 68-301MOMof0"MnT A 12!............ I-Ccation Bucket- papp . . . . .................. . Gil JI-6 No. ................... Grounc! Mcvctinm An ....... ........ A 1— 0 .12M . . . ................................. Observed,: .... 50"1 Tes, Z/ TOPSOIL: Dark brown silty CLAY moist firm) M., SLIDE DEBRIS: r; N30 E,10'1\14' ISO,- X 1. MOM; Q --- '1 10 :N55 E,12 N Hole tight, we11-hed6cd Bedding discontinuous, blocky, fractured I -AT) Sheared SILTSTONE with slicks Slide plane U 21'. N50 & E,12 0 N, BEDROCK - PUMNTl', F('jR_'.'_Vj'T0N- Intei:- 25, gray to black SIMSTONE and tan to gray medium ShNDSTONE I OD 0 0 24':NGO WM0 WE 28':NS,5 W,30 NE 7-:7 Near refusal n-4 Total Depth 31'. No groundwater, no caving. WE; Via. ............ ................. z`POJECT:.. ............, ; anlcr t;....... r................................................................................................................................................................................... M:tLad cl £340M......zA...J7uc'k L- iuxe- , Gt.: ,poi.) wo._._.C 301 1...K,..............................Lo,-r t T Gromid 9G6 IMMOM See Dote Observed. ..... I.1 ..._ 5G1 ! ." ,1V V V J 0CSC7'',-. ti(.);1 TOPSOM Dark brown silty CLAY A-; nsois+, stiff) some uessi.cat_icn SLIDE E l IS Intei-iJe=Cidid tan ; c K own 1T1E-'dium fir,,.• S NDSTOWE an:t gray clayey SILT TONE t 4' : Highly fractured tsMh open ti IraaeF';xr r 204 yJ__4F I. 253 4 voids to 3/4" wide L-W4401 Foss[ W,22hleslide. plane. Bre cciat.ed 1' : N85 O [ 0 N/` 6 10' . NU5 O I " f,2S` NE 145' : N 75y r W, 25 NE Tight hole 0 1.. 7Q' : Cla yey TL F E'T"7_'.'E with slicks, i Nome. shearing, no gouge: N850E, 250OW probable slide plane. BEDROCK -- I?UENT? I'0?V-1 tT ON : ntkk- r-- bedded dart: gray to black micaceous SILTSTONE and gray SANDSTONE. Bole firm and well bedded to bottom. 28' : N730W,230NE Near refusal Total Total. Depth 31' . No groundwater, no caving. SM, Test r- M\•. £ i,' G..' E." f' f ..-,I+.. r.' t., a..' :. . L :a .-._ _:^' «: n ei F:i c ` `i..rr FW'3 r.. r.,s' ......................... V0JI-CT: Diamond l:.ar_ r,lei, vd of C:r iHn 2.4;` Bucke i - tivC x .f3rgod b (AT r .l 15 ,....."....: 0 1................. I _ .............................................. ............,................. _.. _ GCGund ENvAic;,:............g.20......_..L,,-WiUrn:...-........................See...MCI......................................:..........?r;t E z ~ y` h0 `SLv ry f r h j R Jz L7r00 e fir`@-= .,..,..-. 1 1 JiJ! s 4 n N t Y 1 t r 4 IZ&• Mixture SILTSrl il' E and SAND j'O`Yi }}-- F- Mist, V. 1'1 7 i s t , f i rn? g SLIDE DEBRIS: TaD to gray clayny SILT::,' DIE and tan SAAT7STONE , dry , o moderately weathered, r ctureC` Fk J C ..__ D Wr o 41 :N /, HE r clayey SILTS:E (--L-'-t='l r rry a , wia - 0 ...., -_-- - . _ - 1. Pt Shears on SILTSTORE E--W4 3% sandstone, loose, tin Highly 'brecc iatec gray SILTSTO:TT bedding indistinct Ivt `'err l e,r i'C'i'L1i•i', '_i r i :„• i r i. Ei.-r_. No bedding, fractured, 17rycci.atet: J Possible slide plane at. 19 ' Thin bedded gray SILTSTONE with some gray SaNDSTOnE SHEARED nl' E:- a continuous `bodding C1'Mi`3C} SILTSTO_E, no viastic Cjo G 2G' - Bedding highly contorted, C__ ac- tured t 26 ' : Crushed, shu areU rJ-c7.yey SILT - STONE. Some slicks :. CJiJc'1b1e slide BEDROCK -- PUE,.,TE tC_CiC C: C] , L;ni7X3Ci] leU .. p , ; En black Near refusal Total . Depth 1 8 ' . Q A Diamond Bar PROjECT: ............................ ............... ................ ........................... ..................... ..................... .............................. ............................. .................. MuMod Bucket -auger Gil j 07; Pj 3', 0. ................. Ground MovaHam ... MeMeNJAME. v 9 N: /iolf Teo FILL: Mix1re of FILTSTME and ShNDSTONE fragments (moisL, firm) Compacted sheax-key backfill 0 tight, well beddW, Approximate! N20'W,10% Unable to pcnetrate rosi2tant bodding, Total Depth 28'. No grounawater, no caving. 1TEMr-5loop FACE CAT: Log Ito.........` .......................... P, U3ECT: Diamond Bar_' Mckod nS L3dWny:......2II... Q.u. :q.t-a,L.q.r Luggad b GH s iy ` O Q--301. Wound Mevotiv;k:......,..9.15..............1atutir.): Sve lap ....................E ri'e 6 J 25 t r I ' e S 4' ttiti• TOPSOIL: Dark brown silty CLAY moist, firm) SUBSOIL Brown silty SAND (moist, tight) Dascrip` ion SLIDE ' DEB TS • SANDS'''Di E and SILTSTONll fragments with some soil intcrm.ixed 1. 2' . Sheared S1LTS`a'ONE . continuous around the hole 10' : Open fractures to 114" ;;ido in massive SADSTONE 19' : Shear plane. Dark brown, sheared_, CLAY slicks, gouge li to 2'' thick NQ0W, 3301-: 23' : Shear plane -- 1/2" thick. Gray clayey SILTSTONE --- N400W, 40E 25' : hedging continuous but sheared N350 , 39E 28' : 8" thick loose brown SANDSTONE 34' : 1/4" thick moist silty CLAY bed over unweathered dark brown SILTS`1'OME N650W, 170E Probable slide plane. Lis?]. 1. OCR---F'IIENT.E-rOR.MATIO : Th i : -Ry- N f bec;.decf to black SILL;:7'( Nt' I'` bnable to penetrate resistant- boc?dinc., ti Total Denth 351. No groundwater, no caving. ScH Test Diamond Bar I ..... ......................... .......... ........... .......... .......... ........... ............ .......................................... ......... ............... 24" Bucket -auger (71 Job Wo. 6 ..0.-10-1of .................. urillitlw ............................................................. -.11 ............ Iomwom ... _.aanHap . . ........ ................................. Z' 1 1, X..f` fvvy / 104S-A SvH Test FILL: Mixture SILT STONE, SANDSTONE an St zL SLIDE DAIRIS: Oiscontinvoud beddi.q-ml10 . I Thin buddea SILTSTONE and massiva F SANDSTONE AttituWas random and disoriented Ono Rt2 too c'LIDB PLANE: 3" qouge zone with MY,,- biown ShAQ plastic CLRY, shearcd, slicked IN 6 0 0 0,16 E BEDRnCK PUENTE FnRnATIOM: DaH. Total Depth 291. Iroqj_Lo,iin'.wziter, no L....... z PR0.1 CT: ..... ........... . ........... .-,,, ii o n T)a r..... ............................... I ....................... .................... ........ ....... ........... . .................. I .......... I ............... ........... DriiFiig: ...... Ducle.t-plll J E ......... ..................... by G 11 Job Mo . ........ 6..8.-13..O..l I ..................... 935 S e, e M Lu) fie"vrtd'. Ffcv i-,Icsn ....... ....... Occition . ................... ...... .......................... ...... .......... ............ Sail T", p 4 2 1. 25 SLIDE DEP-MIS: Interbed6,ed incl -an SA-DSTON13CN, Random attiLuaes clisorientecl blocks and fP 51TT' , r -! -- - -0 111 t- e C1PL__,VAT, : Sevc = cci,- c)-ushad zorlthick. Sh c_-, red, y L2. pc),- si b J- s I _L BEOROCC, K 11ENTI- I POIRTMATIO1,1: Thin Iv l C jk mi u c o STLT- A- PE Total 31' . ldo t C' 1- , 1-10 (-'ZAV,.nLLI 1 DIAMOND IBA'a PROJECT: .............. ... ......................................................................... ....................... ....... ......... ...................... ................... ................... ......... — ................. Pi' ........... . lob I., Ground El(wc410n: ......... 19.12 . ......... ......... .......................................... ...... ...... /15/6c) T I ON, r -, 5c F. I i, /50 1 L TESTS FILL L(5c)L 0 repa cell i. A TO-Pl"01L. 7,ilf-x- k'-"L',n Y d r i -i A j -) r c) n j i --. i a r c 1 D , s mo j - o near hase; cruel` -_',v L 7 r S c c a -to c- S I L an cD77' D_1._) D.11 e,.ro,,inrl to n 10 4 t yc,, I lo I"'- J'--r-)'-T @ 19 Beddinq 145j"' 9E 0 21' or4C_n+-,t N10-vi 2-'-r bedCdrig, cialicl--,e alonq faulL. 22-24' 11 a r, -1 ST @ 216-29 5 SANDSITC-r-ilE J-Jed 0 30-111 Ilard, ceine-rited, ST_PTDSTO'.E C3 32 ' P_ e ift d i n gm 17 2 5 Ir E silts -Lone 1.)0-ttom. 111)lack and hard Zotal Depth = 42 I't 4 r- Groandwater No C,,Viflrj rs.J.................. —........ rROJECT: ....... Diamong...Bar Tract ............................................................ .............. ...........,......... ........ ..................................... Frsefflod cF fril;in f: ...2.4-....i...n.ch ,uC.At...............ar•[ d sY )1....... .....lSnsff...... 6.- 3 0 1033 Lot 4 8 , See ^.ap ..... Fig: v'Jscrvecl:7% .....I6.g....... Groutu!Elmifion:.................................acatiort:..._.............._.............................................,.........................., r n Criflti01 % Soil T Sf TOPSOTTOPSOIL: de Silty CF,7iY. lltlti___:_ f. Jam'`\ YytiE browia (dry) SILTST'ONE annd SHALE fragments in sand matrix Dorlinantly Z1i. JDS"FOAvE. ith ; r:tenccds of micaceous SILTSTO ?.t., and 5111"LE, moist, ye71oi•, bro;-,n. @ J' - Beddincf N2.0W 23-L1E 10' - Open join Us to <" @ lll2 - 14' •- STjiDSTONE bed @ 14 ` Two --inch sl.c.Lrcd ,-;TL.t.a_s_!, be -d- o riente- d N8C 7 l6N, prn'D--ble .,Iild plane BEDROCK: PUENTE F,.0RMTiTID??: Thinly interbedded ,DIL' iS201,f-:, S:y :DSTO,M and SHALE; firm, mottled orangG- brown to Cray -black @ 161 N85E 13NN @ 20' N80E IAIN •1 @ 22' Terminated on hard -cemented SPIT DS! 0104E Tonal Depth = 22 f L- No Gr_ oundt-r,tor No Cav]_ ny i D 7 0MA—Slei' FKA: DAVA, LIE: ............................. 30578 M. ............................ ..................... .................. M— inch PPWIWM2 PLMabod ofDOWT.-.1.1................. .?......... ........uj,j0d by................. . --------- job NO—A-1----... Grounc: Flovction",2911 . . ..... 400, Soc Map. Dialo E) I SC P. I PT 10%, 1 L TESTS q Q MW Ary r. 9116= 1 L SLIDE DPBPT2: SILTSTONE, SHALE, and SANDSTONE RUBBLE SLIDE PLBNE: Oriented A307 1- 7 N on A& SILTSTONE; Slicks trend I J-1 2 0IN mun" uh: "unwTs wo;Mxluv Thinly Sterboddad ' S'TL'--:rrr Y;- ane_ SANDSTONE, firm, noist. @ 141 Bedding N70W 14NE @ 141-16' SANDSTONE bed @ 19' Bedding H65W 11 HE @ 26' Bedding N70W 1G UE, SILTSTONE becoming blacl and hard 31' Hole terminated on hard SANDSTOM Total Depth " 31 ft Do Cyoundwater No Caving Robert Stclne & Associates, i ic. POJECT:.............. D.iamc?r, d...ti+..r....TXZ-C.L... '..0.sl.3.................. .............. 24° Lucked viaer 1r' r IAAct>ic:! of GriIL*art:...........................................:.......,.....................,..........io re:v +....F .. L.............,.... Ground Eluvaiiorl............ .72..' LaccPi n......I a•t zt ticln9?7..`..................('[!t• t i]s+CV r:....'.......5.6.9.... c Q;, 1 r]' "<i'•' i}ESC"'IPTON / Soil TESTS Q ``• `''•• Fi ! _ - y-G TOP SOIL Dark brown, S:i)I.ty CLAY ir>n, s1.i_ght]_-v iiioist SLIDE C.L'B IS: Tnter1.Jeddod light c a-2%I to b -in SlL'11S`.l"OiM with so.lie c.-a ]f SANDSTONE. Rock op,.n L.o Eeddinct discontinuous to 4l?., , 2 Dry to slia,htly moist, fractu-red t 41' Highly fractured, continuous frac- tures can he tr"ced to 41 1- feet 41 ' SLIDE AN : I-- racttiririg abruptly terjid.natYs ari thin sh7- r"ed clay bed. l,n_ prozimate altitudti_, N40E8NW BEDROCK: PUI,NTE, FO_PU"ATI_ON Deloi.l 41?-2 `X C adT:c i ic)ht. Color chancre,; to dark brown, mi caceol'c SILTS'COiq-L, with SoIFre L)AI\JDSITCi! Unable to penetrate resistant bcdrock Total depth d _i No caving, no gro ndeia.ter Z P, D TA ............. . .................. Br, Tract 3017 p R (D.1 U. C Diamond ...... ........... I ....... I.- o......... - ........ ........ ......8 24" Euckc-t jo l 'IO.':- GO-301-00 Aetlloj of );illhIg . .............. ............ ......................... ............................. 10•cqod .. Ground 'Elevafior .......... ............... ........... !..!?t 53 iveacron I'rair Lane.,, ........... D,,mc Observed: ....... 715-6c A OIL TESTSYDr.SCR]f'l ION l/ 10 Y:7 A r TI-linly 134:!daod with some tan S7\114DSTONE, but t"on-11-inuous to 15 Attitudos near liori:;cntal. AttivaLlc-s tratel'2EDlZ0Cj'.` Tot.al DelDth 4 5 NOI no groun(lwaterCcr i K._€Lip'?i.%:tl L.i; 16t:$i. :r:L",• F.4''i........:.`........:.............. TR PROJECT............p lc l onC....13[7'.....................:.........................:............,..............................:................................................ bb_............................... 4 " 7 "' '- . r , 17 }7..•.................. C11l:eths,c€ of €7ri1linc:.............:...:.......4.nS......F;-12.S7,r.:4...:...:.........:, .......€.cc.rd €:, ......._ ,. Grounc€ E,ievrslion :.AQ: ..: ` , l,ocalign..,?,/u/L...53...Ur qr?n...`.L'3:.aW..:T,aun..._....... 1F ' .; ti:' l.t'' tj'' ¢\° yC .• ,011 TESTS i)CSC( EPiIQPI ff brown s it_t stone and son0_-tcne 2' N55E .;NW. thinly bedded tan silt - HE stand (_„ gist_, hard) 5' - 7' P65W 5NE tan medium sandstone bed j 7 t -9 ;' lnterbed5nd silt_steno, s:, igh-tiy i folded W- 104' hard, well-ccment;ed sandsf_one bed Below 10y' bedrock dry to Elightly moist; verb., hard 13 ' N 6 5 E W17 Ili' Joint directiun NSSE, v r ica 1. S1 Whyly 0000 ;,: roQW, s isv ""ha.na-Ona and sil'i stone. BodrOC:k bec:;_'.. ng Cx:_y j 17' Id50E 8Ji'ti.7. Eedr_ock weathered to mottles colors of yellow -brown 20' N60.E 110NW - thinly inerbeddod siltstone and sardstona. Koasturc f content slightly incr_ aced. Minor shear plane along :2dding. 211' 1/ 4" open joint oriented N80VI 65-70S , in 12" thick, hard sandsten,_ bed. 24' N85E 1ONW -- minor shearing parallel to bedding i 27' Bedding horizontal_ E 30' N401, 1--205W 35, IvGOE 60NW -- bedrock c•on ti.rsuns same as above 4}0' N?5E 6','NW - bcdd.zng continuous to bottom of hole Total. Dapth - 43 feet No Caving No Groundwater r nc. Robert Stone : Associt.te, i rF, - :kD C1 _---------- Diamond Bar - Tract 30578 PROJECT: Mothad of (fIIIiEI:i' Z`t_ --t l C E t_.I. Teel__-___-, LfJ"p'-4 l` Z _ -------- job i'i., Ground FIe\rc-tion: -------------Locntian: _.1/>_3,C70_._ F sv/:•; Cn_cr•ip'ifm oil iI t SHALLOW SLUMP- 1-;athc.:7_ed bedrock 'x7ith CZ_! CIl )S G.iQC appears Cl1 ,'LL1'ibed, 1 urecciat-cd, rotated. 5._ F, _ tr k•.1`f _ 1 1 S Note: This slump is also exposed iIl adjacent dozer t-rench) l 13' base: of debris N70r 9e'NVI BEDFOC K : I)uE'n—e I'i7tT[l 1_f)n Tl1 L C„a- cala chc Tong joints. F :_dctirlc, con- tinuous 18' N25N 4 MI 22' N85E 3Nt9 24' JoInt surFacc i117SE 80SE 25' N70E G,N4d sl igI-,tly moist 29' N45L 71NTW 30'-31' Hard sandstone bed 32' N55L 611W bedding continuous to boat-oltl of hole Total De.. ath 3 I'tu Caving No Ground Water VMS, r.. t ...,.i.yi4i,f: f. if: 41. .. ... -.i . Log too: ....... -- ................. NrJJi LT: ....Diantond..13 r ........T HY :.... .. •1..................•...,...............•.......,....,,,...................•••.•,............•..... ry,•.....(...[,..........,.................. 4 ohod oF Qrtflitt . ....,,.Cr.1.1 1 G.f...1'Ury. ] .............— T ' gad 1= i. :L+ .fol_ Mis .......... .,....,ac-J= ) ..,... ,."..,........ 7- ..................... ...:?.,...... 70 Ground f:tewition:..,..050•......,. L catian....? 3' f 3.n i .... 3^J.:1c:1f-'.1....TX-1-)1J:{.._jMA- C.?hser.djQf ......... o' L TESTS 72 TOPSOIL G-9' Dark brown silty clay i• t e ( moist, firm) o j skits _. 1 . r _+ 9' -1G' merges downward to mixtn re of soil and bedroch debris weatheredAVN3Dli) fractured weathered40S:Cweatherededred'; t 1' N75E 25SE 3 f 2.9 N40E 13i: W SHEAR PLANE: : Developed I an firm beddin4 S1_i.cMs;. des nearly down dip of bed. Badding -"iris; and con-1 t U s around hole below SHEAR PLANEEI AROCK FARM - tan to olr nqe siltstone and sandstone. 31 `--32 Z' moderately hard sandstone )red 35' N60E 8NW Below G' color changingt. . g to alternatinc orange and black. material becoming more unoKidized with d.cptD. 1 40' N357E 14 NW - Udd:ing continuous Ito L otton of hold. Total Depth 441 No Caving l F • J l j F J\io F ibevf Strom, Assocl 64. t c- s S. U [11 S r, S Vl PP,OJ'.-CT: Tract. 30578 2 Allcj,r Ground Oevolion. ---------- Lot-53 1 7a.cfori Tr,,Arl a,, epT,... - - , 5 1' 71 TOPSO, : I.-i'Le b):mvn, Dark C jo C C) .7 1 & y c, yr S IL T , q r ad c s o r, r d j - j -i L o breccizal--e.d sondstono and shale encasad in crange-brown cla-yey sand ma.tri:,:-. SLIDE DEBRIS T L :-121Largef-)-Eocl,-s of broken, li Sc- 15 - I G t Wh i L -il.-Irl Ga1 i c e z 0 n re (,,-I 20?;' N30E W 5S r C- -1 L C- d s I lc-,,;,s well --efircO. slid(- - plane Y b lori v- so iripar' P- I iolT 1-3 D R 0 C 1 P TY! 11 T] F 0 T 2 1 odd c c! ili g c o n, i n 11. Ou S -a u n d lhole 2 2--,-2 5 Iassi-qe tan S,`,-:JlTl)SrPoN-C 2 1115E ION,T1, 5 Eelow 25 t Intcrlbe6dcd SA"b.DSTO.-,-,? and I SIT TSIONE, tmfrac- LUrCd. 28 ' Streaks 'Of 1--'IdC:1,-r unoxiclized S- L1` ne becj.c; LL- 1-S4-o 34 ' N30-13 90 J'Illcll. Bed(I-i-rig continuom s to bc), k-Loj,.-, ITCA- al Depth 36' No Caving t li 1 -y ti1R 1 \li_kC1Le.c j Dimond B,- r '_tract 30578PROJ!_L`T: i 2 4 " Buckut Au rr rh: rh d srt :'SitiFi C?' -_- -- PE'; GIi 1 __ F. EI `C/3C b'/ ._. ___-_al7l? CND.1. ------------ Grauml Elevation: ---_-_____Lcc JpS,? ---------------------------------------------- a TOPSOIL I 4 l 5 n l.l l 6 r I Descripfisln 3.azk brown silty CLAY I 3' Brecci-ated bedrock, no contli nuous I-) ed cling i7-10` Soil filled fissure oriented V:) , ?ear vertical, about 1" vdc e, fillers ,::nth loose debris 112' N15L SANDSTONE with Si i - stogie interbeOls. Heeding d Vr p-te y vei `ica-1 soil filled fissures 1.9' Di ametez or hole narrow to 3.8". a J1t.' Soi1 filled fissure extonds to at least 10,1' Total Depth -- Hole fermi n ati on on hard Sandstone Lecl N7 Calling i IO G:=oun(:Na (:. 1r j soil rest 5- 15 25L:3' 35 41j 5k:i _ _!' i 711r_ 10E E: fa K ......................... Diamond Bar Tract- 30570 CPR©Ji T ....................................................................................... ....................... ....... —................. ..,,....... ................. ................................................. ............ MLAhod of Drillii;y: .,2 ...,.Lt': ......-.. t l...............................acgor•' Groynd Clci'rtio:................... i.00£tti tl..,.......:..... x..........., ..........:.,.... ti1.._. ..].r......,,........... a.? c: s_rved:.. :./.. ..,r.i7... y {' t rs tl` RFSCi.SPTI'L iJ SNL TENS it C• '. 1w' V f \ JY ' i _ rf...,.- mow..-...w....v.-.. ,-v-.....m--..--..-w. --..+v..a.-...-_...e.e......-.-..-+w f -- ...-.• P•*-id.£': tTOPSOIL: Dark chocolate brown ::a17Gy E ' f f _Li.'.'i= 5 r1a`.(iRo of near top) . GJ:aWs IrC/ Cicn%,n to oZ'c'.nga-brown subsoil with I shale fragments. SLTDF DEBRIS: f32:P_C:ciated SANDS`.iODE f.__..I I F' }[ Si_I_ts'i:ofle. 14 ` End in- on north side of hole N70E o.. 77S . E _ Be s not continuous to south side of hole. 17 ` FedO iAg on west side of hole N70 450S.E. Gentle dies on east side of r gczJ.i'_'rally broken but 't`1 yI L . 20 '160E 17S.E. De?ding is nearly co -- tinucus , e cep t Lor narru4 zone 31' Sandstone bad with carbonized horizontal, some brecciation. I 321 1/2" f'.lp-_'-i fissure 7 orange-brown SANDSTONE (very r7__r: i7 Xyd. r 15 SLIDE ..-PL1:-LE: Material continuous bolos' plane, i]Y.'ecci_c t;eCJ an\z ,S'tnulr['d cFii7.F' 1.}1a,.e. No s1..C;l: { c:'r.;s,erved. SLIDL i'!:L ,OE ertxenely Ismooth. MEQ % 3"N .. W . l f - - Robert. Stone & Associates, PROS Ci: Diamond Bar Tract 30578 P ieSixnd or' Dri!IiraS' --- 4 " - r%uC:_ F5 _ f ugCr--------------- -f.y'l: f _ __ -- --,--s - w r'-1-..-Y --1----------- i ia.IL -3 Q_x- :5 Q------ Gr F , 97p t 3r j acron `train Lane , :. te' ( ^.^ round t r;iocr' -- cceri n:_-..---------------••------------- -Da:.. v,-served: 20-/------ Sai! 'Fesi f TOPOI7Dark chacolte brown silty I CLAY gradles to mixture of soil and a, i Bedrock Fragments. 3! „l SLIDE, 1:,T ;;TIIS: Sharp Lonnd_'ry between fat-ezly._=c mc:Xturc and cl-ocolate br4i:.Z top 'saiJ - r- 26 1 Soil gra. aes :into shale br-,ccil-j 119' NQ r 271 i,,160E 40S.F. interbedded and Shale tit' Open fraci-u e F:illcd v ith i-oose, 1 de) s tea` 1 f g C! den Fr_ actur=- can t i nue s r tv r. R !.? ... r. r F C'.aUY .7 .1-1 kF.c t'L{ L'-r:j"• r'i P- ., r:.uir.3 __"_.._.__..__`--•'-- l amond Bar Tr { _ a a 7 g -.._. B1 cketf*i_CrC 4]• P.Iitlf: Auger r Y P E%r_Ii 1-68-301- 50b -------- tf0!idErCYCS Oii:__-970 ot -; _a on Train Lark r 1_ Lr'2_.170 0f-._-_____ i e jA to }•; j r Al 6G r s r 4' z'JFr!.c 4u-rinq i-crminat es abruptly o O shearplanei11.4}?, N.T'Te TA a, G'°"a al s,, hcve plane hJ_c!t.I1_y brElocia - ed: a P? ane parallel -to underl`,Ing PIne h —bly polished -- no slicks a lni = r1J adr rt SIL'-il-3`1'O TE and SAND- t Sim 45T 1135= 1I13.W. - idassive L-7;.1 SAi D- S' i o NE Be(-"-,) cT-1 becoiLi'::s L'.Poxidizec ,,,TI"Lh II deoth i nrv. .ielrrrr-.ri i' i.rr, t D r E end of r IaGC: E` jfF[ Total D_P-th 60 Ii: To Caving No G2:ound';,':'.te:'