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HomeMy WebLinkAboutm30578-2 (3)EA.abert Stone & associates t Robert Stone & Associates, Inc. Engineering Geology • Soil Mechanics • Foundation Studies 19720 Ventura Boulevard -- Woodlind Hills, California 91364 213) 346-0565 - (213) 873-7382 November 5, 1970 1-68-301--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: We have made ex. visual geologic i nsr 2cti nns of th.c s' y,- ject tract during grading, as required 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. Boring 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: E. L. Pearson and Associates 1-68--301-09 November 5, 1970 Page- 2 DATE JOB NUMBER SUBJECT 1/13/69 68-301 Grading Plans 2/3/69 68-301A Addendum Geologic Report, Grading Flans 3/21/69 68-301B Grading Plans Addendum 3/21/69 68-301C Supervised Compaction Rp eport, Pavilion 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--301.H Graded Slopes South and East of Pavilion Site 3/31/69 68-301I Addendum Compaction Report, Tract 30577 Pavilion Riding Area and Dike Section 3/31/69 68-3011 Addendum Supervised Compaction Report Sales Office 3/31/69 68--301K As -Built" Geologic Report, 3:1 and 5:1 Slopes and Channel North of Pavilion Site Tract 30577 4/4/69 68-301L Addendum Geologic and Soils Report Lots 130 and 131 4/5/69 68.ol 01M Addendum Report, Fill Slopes 4/10/69 68-301M Addendum Geologic and Soils Report Proposed Model Lots 127 and 135 4/10/69 68-301N Filled Ground Report State of California Division of Real Estate Report 5/l/69 68-3010 Design of Fill Slopes 5/8/69 68--301MR--1 Monthly Report #1 5/12/69 68-301P Alternate Design of Shear Keys 5/23/69 68-301Q Addendum Report 5/27/69 68--301R Redesign of Proposed Grading 5/28/69 68-3015 Additional Soils Engineering Information Lots 170-176 6/17/69 68-301MR-2 Monthly Report #2 r Robert Stone & Associates E. L. Pearson and Associates Noven-ber 5, 1970 1-68-301-09 Page 3 DATE JOB NUMBER SUBJECT 7/8/69 68-301MR-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 68-301MR-4 Monthly Report #4 8/25/69 68--301SMR--5 Semi -Monthly Report 05 9/10/69 68-301 Redesign of Proposed Grading Lots 68-69 9/11/69 68-301SMR-6 semi -Monthly Report fib 9/?2/69 68--301Y Review of 5:1 Cut Slope North of Pavilion Site Tract 30091 (30578) 9/23/69 68-301-00 SMR--7 Semi -Monthly Report #7 10/8/69 68-301-00 Semi -Monthly Report #8 SMR-- 8 10/13/69 68-301-OOZ Supplementary Report, Lots 68 and 69 1-/20/69 68-301-OOAA Redesign of Proposed Grading Lots 59-62• 10/22/9 68-301-•00 Semi -Monthly Report #9 SMR-9 10/30/69 68--301-00 Semi -Monthly Report #10 SMR-10 11/5/69 68-301-00A33 Redesign of Proposed Grading Lots 50-55 11/7/69 68-301SMR-11 Semi -Monthly Report fill 11/10/69 68-301--OOAC Supplemental Geologic and Soils Report, Lots 59-62 11/21/69 68--301SMR-12 Semi -Monthly Report #12 12/18/69 68-301-00 Semi -Monthly Report #13 SMR-13 12/23/69 68--301-00 Semi -Monthly Report #14 SMR-14 1/7/70 68--301-00. Semi -Monthly Report #15 SMR-15 1/9/70 68-301-02Z Supplementary Report on Corrective Grading; Lots 23-30 and 170-176 1/12/10 68--301-01 Geologic Report Lot 81 Robert Stone & Associates 4 E, L. Pearson and Associates 1-68--301-09 November 5, 1970 Page 3A DATE JOB NUMBER SUBJECT 1/27/70 68-301-00 Semi --Monthly Report #16 SMR-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 68-301-04A 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 68-301-03 Semi -Monthly Report #17 SMR-17 3/6/70 68-301-03 Semi -Monthly Report #18 SMR-18 3/26/70 68--301-03 Semi -Monthly Report 419 SMR-19 4/7/70 68-301-03 Final Semi --Monthly Report 5/4/70 68-301-07 Study of Soil Cement Mixtures 5/11/70 0-0153-00 Final Geologic Report Lot 148 5/12/70 0--0153--OOA Foundation Engineering 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 Geologic Inspection Report Lot 81 Mayes Robert Stone & Associ«tes E. L. Pearson & Associates 1-68-301-- 09 November 5, 1.970 Page 4 CONCLUSIONS AND RECO14MENDATIONS General. 1. I From a geologic standpoint, the subject tract is favorable and has a safe building area on each lot. Additional geo- logic review will be required in those instances where a grading permit is required or in special circumstances 05e Svperu Sdd Co»,pclGh^" where unusual building design warrants this review General A0-/ 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 subject tract will perform. in a satis•- factory- r:::anner. Future cut slopes proposed for inffl_vi(9_ al_ lot development should be reviewed by an engineering geologist if they exceed three feet in vertical height. Cut slopes which would undercut bedding'or disturb existing stabilization measures as shot,Tn 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 6A line on Lots l", 43 and 46411D was necessary when additional data concerning the limits and depth of Qls-4 were obtained. See the As -Graded Geologic Plop. Lots 187 and 188 may require restricted -use areas on compI.e-- tion of a geologic investigation.. A complete geologic investi-- gation will be necessary prior to any grading operation on these lots. w Robert Stone & A ssvci tes F. L. Pearson and Associates 1--68--301-09 November 5, 1,970 Page 5 Sheer Kays and Buttresses 5. Shear keys have been construc•;.:ed. on Lots 47--55, 58-69 and r1.70-176. All shear l?;c y removals were inspected cnd app:r.aved by an engineering goologist prior:' to the placing of compacted fill. 6. Buttress fills have been placed alone. Steeplechase Lane adja- cent to Lots 11, 12 and 15-1.8 , Lot 44 adjacent to Rimf_ it e Lune and also al onq 1. agon Train Lane adjacent to Lots 70-74 and 76-80. Subsur.f_ace Drainage 7. Subdrains have been placed in all shear keys and buttresses except in the buttresses along Steeplechase adjacent to Lots 11, 12 and 15--18. The height and key -width of the SL'eep12Chr_i6e_ Laint drains; however, paved drainage terraces have been placed on top of the buttresses at the nal--ural--fill contact for the removal of water from the buttress area. Subdrains have been placed in canyons b•neath fills in Lots 104, 105, 1.09, :i.1.0 ; 113-115, 1-23 and 124. 71.1.1 subdrains were inspected by an engineering goologis t and roils engineer prior to placing compacted fill. Canyon Filling and1. Preparation 8. Fill has been placed in canyon bottoms in Lot 15 adjacent to Steeplechase Lane; Lots 19•-21, 74 and. 75 east of Wagon Train Lane; Lots 87-89 adjacent to Pocky Trail Road; Lots 103-105 between Kicking F:orse Drive and Rocky Trail_ Road, Lots 108 -1.10 E. L. Pearson & Associates November 5, 1970 1-68-301-09 Page 6 adjacent to Wagon Train Lane; in the area of Lots 111--117 , 12 3 - 125 and 162--1_G5, and portions of Lazy Meadow Drive. See the supervised compaction report for test results and foundation recommendations, 9. Canyon cleanouts were individually inspected by an engineering geologist prior to the placement of fill. Slide Removal 10. The upper portion of landslides was removed and recompacted on Lots 47-49 below Wagon Train Lane, Lots 77-79 above flagon Train Lane, and Lots 24-27 above Steeplechase Lane in order to provide a stable building site. Sewage Disposal 11. The tr_ar-t ;ill utilize se?=ers. With tbe- eXception of the force main excavation between Lots 155 and 156, set•,er alignments constructed along easements were mapped and inspected by an engineering geologist prior to backfilling. The force main excavation has not been made as of this date. The information obtained in. our inspections is shown on the attached. Geologic Map. The sewer alignments inspected to date are geologically favorable for the intended use. We will inspect and report on the force main excavation at a latex date. Offsite Gradi 12. Offsite grading completed in conjunction with adjacent tracts shall be -reported with those tracts except where this grading extends into Tract 30289. B. L. Pearson & Associates ]_-6B--301-09 November 5, 1970 Page 7 Planting 13. We recommend that the compacted fill slopes and cut slopes which expose deep soil cover be planted as soon as pract-i-- cable to minimize erosion. Deleted Canyon -Fill 14. A canyon fill shown between Lots 39 and 43 on the on gi-Wally approved grading plan was deleted during construction. This r fill was never on the base map for our geologic maps and isi not required from a. geologic vie`,-1point. Very truly yours, ROBERT STONE & ASSOCIATES,.INC. T1 orateE. Ray, Eng7-.''Geo10gist And By Robert Stone, ?.D:, esi: III, R/RS : caa Enclosures: Geologic map Sheets 1A-- 7A Cross Sections: B-- 2, G, J, Q Boring Logs: A-Y Distribution: 4 Client 2 County of Los Angeles 1 Dept. of Bldg. & Safety; 1 Geology Sect i.on) t Stone E., Associates J _^•.; .... Mf.4 sti a`<t D? YA Log "ors........._......................... PPORCT: .... Di.amond...Da.r............................................................................................................,........,...................................................... IY obod of Drillinj:... .......3.1 . ... 1i C r............................ Ilr ......Loro.ad by P . E . /M . E . Rob No, ,........ 6.g.-:.ap..1:.....:...:....... 921 1 See 1~1apGroundElevation; .............................1a[af'son:....._.......pate Ol ser ecE:...S./.II./?. L 1 per' r.'' .`q ZJ ' C q Op Soil T'C.it QyC G •;` J ; J E c, \k p`y' pes[rifi4n Tan SANDSTONE and occasional siltstone and shale interbeds slightly moist, fractured), 5 10 14N on SILTSTONE bed Primarily SANDSTONE 2b r Plane in siltstone Tar in SILTSTONE bed Shear plane, thin 020W, nearly horizontal (curved slicks strike nor-h) Total Depth 36' No water -- No caving A LooNo ......... ........................... suB-SURFACE DATA P• PROJECT .............68-301M,th,d of Drilling: -.. 4" 13ucket Aug K ............... ........... Logged by'' M-E-R-Job No—..... .. ................................. rvcd-,,/69 Data Obse .......... Ground Elevatlom.............................. ... Locatioll. .......... .................... Sail Test k` DescriptionC; 0 Ise Tan to brown SANDSTONE with occasional' siltstone interbeds 3 -isO north dip 11 2LI 25 30 35 Dank grey to blackinterbedded SII,TSTONE nd SANDSTONE 1 31 N-S, 17 E on shear plane Total Depth 16' No water - No caving 0 10 q A Nlo. ...... .................... PROJECT: - ...Diamond Bar I ..... -- ........... I.I., .... I ................... . MaKad of DMIing"AMAR-AWK . ............................. --Ao'gud byP. E. /M. E - R. Job No . ..... 6-8=301 .................. Ground Elevation: Afh. Lo ..................................................................... )DIe Observed;jz2X. G Iz oVy Description Soil Test nterbedded SILTSTONE & SANDSTONE slightly moist to dry, fractured o fairly tight) edding N60 0 E,15 0 SE in Siltstone - ANDSTONE nterbedded.SILTSTONE and SANDSTONE sliced clay , shear plan W, 17 NE slicks strike N20 E rbedded tand and brown SANDSTONE SILTSTONE (slightly moist, tight, inuous bedding) ing N300 W, is 0 NE Total Depth 39' 0 10 25 30 15 5 U 5 U R ;F%C LOU Nth.......... Q....................... PPOJEcr:....D.iamnd...B.ax: ............................................. Method of ....................................Loogod Uy P . F . /M. E . R. ,!a!) h:o....... .,$....1.......... Ground Elevation: fiH ....Location Se(' Map,,, 5 9 69TateObserved-,• I I o ,ask S / C J . <`' f y y< S G ti-4 ,,. co 1 Description 5oif 'hest Predominantly. tan SANDSTONE with SILTSTONE inttrbeds 1, 4 3' -- N20E, 500NW on 6" siltstone bed ew; in sandstone, frac-Lure-- some open Open fractures to 1/211, roots in SANDSTONE Crushed, fractured Highly crushed,, Yd storteci Shear Plaae with some roots 60 v17, 16 NE Black unoxidized SILTSTONE with SANDSTONE interbeds {slightly moist, fir7Aq, continuous, tight bedding N 65"1<, 17 NE. Total Depth 26' I F1 .14. A U -ACE K'UATA Log V%!o. ERIL .... * ........................... piamond Bar. o n L 1. n u e d) PROJECT. ......... ............................ ............. ............................. .......... ............................ ...... . ............................................................ 24" Bucket -auger G H 68-301 I&Illod of Drilling: .......... I ... I .......................... -- ...................................... Logge(i by Job No . ................................... I ......... round Elevation: ......... 944.. ., ................ ..................See...MaD 6/4/69 DrAto observed;... ...... I'll ........ 0 Soil TestDecripfic; n 40 45 50 55 DEDP,CK PUENITF r,,nRIIIJ\LTIMj (Continued) Bedrock broug-hL out of the hole below 32' Thin bedded gray to black siltstone and gray medium sandstone. Total Depth 511. Near refusal, no caving. Unable to I-og belc--7 39' due to water F level and activity of the slide.'plane tLe„a u, (I 1, a.r SUB -SURFACE. DAYA .9c,. No.... PROJECT: ............L :azn,ond Bar.......... Methor f Ciriffing:..... ...... t1C]C w 1ug t................. ......Lc guoef fx}+ GH/PE Job Ho. .............. 60- 301 Ground Elevation. 944Loccriian:See Map 6 '4 69 CG aka. a Q Jc J`1py dJ` Gp $1 n v>• Description, Soil Yens TOPSOIL: Dark brown silty CLAP moist, firm) becomes sandy with depth. Some open pores below 61. SUBSOIL: Silty clay soil with blocks of shale and sandstone SLIDE DEBRIS: Disco T?ou5 bedding. nti SILTSTONE blocks with streaks of tY nToist ca.t ic-he 13' : N550E,13oSE a Some SANDSTONE bed-s starting at 13' 19' : Thin bedded SILTS` ONE (clayev, moist) N100E, 9oSE Bedding disconti nLio-as for the most part. y 4 ACTIVE SLIDE PLANE- E-Gv 17oN~ Direction of lineation of slicks plane active with offset of _ 1N12E, in hole 32' : Water table and sec'a-_ BEDROCK - PUE v rF rOI IATIa? TYiin beddedgrey to }Mack SILTS'T`ONF 39': (Slide Plane) eTiahtcontortedhpddincf _ Mc;rlTn7 C. 4; Rh 4.... SUB -,SURFACE DATA Log [140........... ........................ PROJECT: ...... Diamond...Bar............ ............................,..........................................................................................................................._.................... 24" Bucket -auger LogeocfGH Jain f lo.:.. C 8-30:1. MethodofDriffing............................................................................. gg y........................................... 980' See Mays date Qi3served:/' 69 Ground1:fever; ian........ ..........................f ocdtion:..................................................................................... .............. 01 ha 4 i t2 h n 1'n\o a• ` Soil Test OzQ J aQ P r rGp \$ 0 DescriptioFi n - TOPSOIL: Dark brown silty CLAY Moist, firm) SLIDE DEBRIS_: 5 4': N30°E,10°N 10' :N550E, 12 N 10 f Sr Hale tight, well -bedded Bedding discontinuous, blocky, ak fractured 5-- 20- tl -, Sheared SILTSTONE with slicks Slice Mane @ 211. N500r,7.20N, 2t irregular. 25 BEDROCK- " PUENTE FOI&ATIONI. Inter- .._- bedded gray toblack SILTSTONE and tan to gray medium SANDSTONE 2.4' : NG0oW, 200NE 28' :N550W, 300NE 301 Near refusal 1 35- Total Depth 31'. No groundwater, no caving. u 5 -F. c CE DATA, NO—_ ....... ........................... PFtCiJECT: Diamond... Bar.......................................................................................................................................................... I.......... I............... Mcshod ofDrilling: ......24....... Bu,c:ket--aug,e.r.................. ............. Laggod 13Y G%I Job No. G 8-301 966' .... 1ocat'on.See ...Ma ...........................GYOL't1rf Eevufon:........................................ .—Mcsfe Observed. ..... G.. 501E TestL escril)tian U Y i i i 5 j0- E5- 30- 35- TOPSOIL. Dark brown silty CLAY moist, stiff) some dessication. wracks to 1 ft•__, SLIDE DEBRIS - Interbedded tan to brown medium SANDSTONE and gray clayey SILTSTONE 4': Highly fractured with open voids to 3/4" wide E-W440N Y Possible slide plane. Brecciated 7': N850W,220NE f:- ry 10':N850W,250NE y;~ 14' ' :N750W,25°NE Tight hole i N172'. Clayey SILTSTONE wish slicks, some shearing, no gouge N850E, 2.50NCB probable slide plane. BEDROCK -- PUENTE FORTMATION: Inter— bedded dark gray to black micaceous SILTSTONE and gray SANDSTONE. Hole. firm and well bedded to bottom.. 28': N730W,230NE Near refusal. Total Depth 31'. No groundwater_, no caving. G7 a V 17 iS li.c C: :: ws'J LF t"va , t?'u !;'ha +`":Ae } ty,.. 4-1: , - SU6- SURVAO"CE DATAT6. e E.............................. PfZOJECT.............Diamond Bar kslftoci of I7riffing;..........:.uC1ceT=.--ctu er..,....................................................................... En ci , GTT 3a 301 Ground Clevc tion;892 1: See Map Date ©hserved: 6/6/6 a............. s tip h 4 h titG Cl 010 0 ` a`/ Description Soil Tes'r zz a c n FILL: Mixture SILTSTONE and SANDSTONElm - 1R01St, firm SLIDE DEBRIS: Tan to gray clayey SILTSTONE and tan SANDSTONE, dry, moderately weathered, fractured 4' :N75oW, 4fl°NTa, clayey SILTSTO iF, Y Y withshears 7' . Shears on SILTSTONE L--1448ON sandstone, loose, tan Highly bre.cciated gray SILTSTONE, bedding indistinct Mixed fiILTSr,f1NR. ana S7.1NljS i JF............. w..,... O } No bedding, fractured, brecciated Possible 4slide plane at 19, Thin bedded gray SILTSTONEwith sy some gray SANDSTONE 4 t 5 SHEARED ZONE: No continuous bedding crushed SILTSTONE, no plastic gouge 26': Bedding highly contorted, frac- tured 26 z' : Crushed, sheared clayey SILT - STONE. Some slicks - probable slide BEDROCK -- PUENTE FORMATION: : Well becfdecl, unoxicii.zed 1ay Coto black SILTSTONE N550W,15 NE Near refusal. Total Depth 281. 190 groundwater, no caving. 2:'ntkolne 6" SUG-EURFACEDALog ................ . ............ S, TA Diamond BarPROJECT: ................. ........ I ..................... .............. I ........... ......................................................................................................................... . 24" Bucket -auger Gil68 Methodof Drill;ny: ......................................................................... .......... —loggod by Job No . .... 3, q .1 .................... GroundElevEflion . ......... ......................... ..................,.............,.....,..........Date Observed; ..... oaa Descript; ort Soil Tost 1 FILL: Mixture of SILTSTONEandSANDSTONEfragments (moist, firm) Compacted shear --key backfill BEDROCK PUENTE FORr,,IATIC14 In-C er- edded SILTSTONE and SANDSTONE, tight, well bedded 26- Approximate: N200 WO' NE 25- .77 Unable to penetrate resistant bedding Total Depth 28'. No groundwater, no caving. 7 5UR-URFACE DATA Diamond Bar _........... I........ PPOJ FCT:................ ...... ................... ............................... .................................. ..................... ........ 24" Bucket --auger Job 1, 0.......—.301 Metl.od ofDrilling:.........................•...........•...................................................€c gc ad by GH See Map 9]_5 location: .................Data Gias rve i:........ 1...6.c9......... Ground Elevation. ............. y ti z 5 0 y ,ui: Cost Lescs• iE)fiO3i TOPSOIL: Dark brown silty CLAY bTn moist, firm) w L . Brawn silt SAND (moistT--.._... SUBSOIL: y r I' tight) k y SLIDE DEBRIS: SANDSTONE and SILTSTONE fragments with some soil intermixed c f12' - Sheared SILTSTONE, continuous around the hole S ci 15 — j v 181: Open fractures to 1/4" wide in massive SANDSTONE 19 ' : Shear plane. Dark brot.Tn , 2U sheared, CLAYosliclos, gouge 1 z to 2" 33 thickN65W, E fig23' : Shear plane -- 1/2" thick. Gray clayey SILTSTONE - N40 W,40 E 251• Bedding continuous but sheared Y N350W, 390E 281: 8" thick loose brown SANDSTONE 30 341: 1/4" thick moist silty CLAY bed 1 over unweathered dark brawn SILTSTONE N650W, 170E Probable slide plane._ BEDROCK - PUENTE FO_PMAT_l_ON : Thin SILTSTONE beddeddarkgraytobuckUnableto penetrate resistant bedding Total Dcpth 35'' FRO o c+.a r M uu+% Iz iS e e.i s +A Kati4 v' SS u va a 5WI-SURFACE DAM Wig r-If3......... 7C......................... Diamond Bar PROJECh....................................---------------------- ............. ....................... ......................... ............ ........ ........... .............................. ............ ................ I ...... .1,........... McMad of Driiiing:..2 '...Bucket -auger Logged by GH Job 140........ G8-301 Ground Elevation: 917 atcation: 6/l7./69rateC7bserved:........_..................... rt °.' cti•k° ` J Oy- ,ti t"eQ y o;,'` Do-suiption 'c;ii Teri 1D 7 33 FILL: Mixture SILTSTONE, SANDSTONE and SOIL SLIDE DEBRIS: Discontinuous bedding. Thin beddecl SILTSTONE and massive y:A SANDSTONE Attitudes random and disoriented SLIDE PLANE- 3" gouge zone with dark brown SAND, plastic CLAY, sheared, slicked o N60 W,15 E BEDROCK w- PUEN TE FORMATION: Dark brown micaceous SILTSTONE Near refusal_- Total Depth 291. No groundwater, no caving. 0 5 10 15 0 25 30 35 40 SUL^ : s' a yfiA Log NO;,....n......................... DIAMOND BAR — Tract 30578 PROJECT: ................................................................................................... ... ...............................................,.................................. Metliod of Dr;109: ......2j=inGh....)3uckel Auge.r.. , ,......Logged E; .,.......................... Job No. ..................... Ground Elevation; ...... ..10.19............ Lourtion........... .............. Date Observed: 7f 1T /—W.. DE5CRIP110N 5411 TESTS fi a; FILL: Loose till material_ from siUe Preparation TOPSOIL: Sandy, Wsilty CLAY,. darky ~ brown (dry near top, slightly moist near base; contains dessication cracks) SLIDE DEBRIS: Brecciated SILTS`1'ONE SHALE in sand matrix @ 16' slide plane BEDROCK: PUENTE FORMATION Dominantly SANDSTONE with interbedded SILTSTONE and. SHALL; . irm, bedding continuous around hole; only slightly moist; yellow brown. @ 19' Bedding N5E-9E @ 21' Fault oriented N30W 28NE cuts bedding; caliche along fault. @ 22--24' Hard, cemented SANDSTONE bed @ 26-29 4' SANDSTONE bed @ 30- 31' Lard, cemented, S11-NDS'TTN bed @ 32' Bedding N25W 11NE @ 37' Bed:3ing N30W 9NE Siltstone becoming black and hard at bottom. Total. Depth = 42 ft..,._.... No Groundwater. No Caving i 10 25 30 35_. C PFOJE-Cl': . 1) amond Bar Mef]-loci of Drilling ......,Z...--1 ttc] e._a,c..er.............................. Angged €j{ GH. JaE Pia. 68`301 Ground F-levation: 935 6,12/ See MaLocation :............................................................................................... C?nfe Observed.Observed.6/9 m CA < r y i• r b10 Q `a5 L. tla i` '`` .` t O v} Description Soil Test ISLIDE DEBRIS: Interbedded clayey SILTST0!4t and tan SANDSTONE random attitudes, disorientccd blacks and fragments. SREAR PLANE: Severely brecciated s crushed zone 1-1 z" thick. Sheared, silty CLAY E-Wl6oN.:; BLDROCK - PUENTE FORMATION: Thin beaded ga ay- o blacJ;. r.Llcac sous SILT - STONE Pk - Iota DcDt7th 31-1. FJ 5 37 35 zs NN PROJECT:......................................................................................................................................,.... Method of Drillin9:...?7inch, l3MAA AU9P ....................logged by Ph Job N.)......5 3-3 Jl. Ground Elevation: Date Observc 1433 tocation:...'ot 48, SCe AZap 7 15 b ................................ ...................... .............c#: cti F 1 .t o`1a' J`' h ti LL `4x o, Description Sol Test TOPSOIL: Sandy, Silty CLAY. Dark brown (dry) SLIDE DEBRIS: Broken up Bedrock, SILTSTONE and SHALL fragments in sand matrix Dominantly SANDSTONE with interbeds of micaceous SILTSTONE and SHALE, moist, yellow brown. @ 9' - Bedding N20W 23NE n@+' - Open joints to 411 @ 110 - 141 - SANDSTONE bed @ 14' .Two-inch ~sheared SILTSTONE bed' oriented N80W 16N, probable slide plane BEDROCK: PUENTE FORMATION: Thinly interbedded SILTSTONE, SANDSTONE and SHALE; firm, mottled.orange-- brown to gray -black @ 161 N85E 13NW @ 20' N80B 14NW @ 22' Terminated -on hard -cemented SANDSTONE Total Depth = 22 ft No Groundwater No Caving A Robert', Stone & A,ssoCIc7tes, Inc. SUB-5 IRTACE A:Dk Lod n......... ........................ PROJECT: .............?., ?Tko 4,,,,}s.Y,. f.....X r C:f...3.Q.ra.7..8................ ................ ,.............,....,:....................................,.............................I.............. 2 " }auGke?f ALl 4 r .......,.,.Lange... by...V i .GH................. - - 7lYeiha:l of L.'rillittc:.......................................f,...............,........,..,,. , ,l. .lob t*to. 3....G.....3.Qu--.Q.Q.... Ground F.levaiio v 972.2' Lot r TQLocation...........................'i. 4?.x3....T 1 ] ... . z1.................. Date Observed, ....,.........,.............. Q r SJQ yN O ytik ° eGy 4`a ' o S}i O ° > r Ly DESCRIPTION 501L TESTS o TOPSOIL: Dark brown, silty CLAY, firm, slightly moist j 31 ? T111 SLIDE DEBRIS: Interbedded light gray ram• to brown SILTSTONE with some tan SANDSTONE. Rock fractured open to Bedding discontinuous to 41 2' 4 Dry to slightly moist, fractured U0 5 30 Highly fractured, continuous frac- iturescanbetracedto411ifeet35 E: Fracturing nates on thin sheared abruptlyroximate altitude, 40iu BEDROCK: PUENTE FORMATION Below 41- 2' beading tight. Color changes to dark brown, micaceous SIL`T°STONE 45 with some SANDSTONE. Unable to I penetrate resis tai)t bedrock Total depth 43' No caving. no arni]t,rwA—Frr TT e r V Jti ..-. .. t, • ccc. 9 u a 3 B—S U Pi r-6C E DA Lao C o.....0........................... PROJECT:............ Dia311on.`...I1arr....T-act...30,5,78........................................... ................ .................. ..................................... I ......... I ........... Mettiod of Drill inJ:...... inch ....B... u...c...k...e.t Auger..................Loc,ryed hy..........1.,.................. Job No. GS-301 69levation:......... a.............Location: , .[1aZ /1.5/ Grou sd E 04%Lot 48See Date 06scrved:.....7. ...... ............ O' q- -`r 4 a US yj~ QqQ- fir ti y DESCRIPTION act' G •5 t ,v `' , V ,, SAIL TESTS SLIDE DEBRIS: SILTSTONE, SHALE, and SANDSTONE RUBBLE SLIDE PLANE: Oriented N 8 5t^? 17 N on firm, SILTSTONE; Slicks trend N20W Bt DRCCK: PUEiK111E• FORiiikiIIEON - _l'riini_y.._ interbodded SILTSTONE, SITALE and S NDSTOI'IE, firm, moist. @ 14' Dedding I470W 14NE @ 10i-- 16' SANDSTONE bed @ 1.9' Bedding N65W 11 NE @ 26' Bedding N70W 16 NE, SILTSTONE becoming black and hard @ 31.' .11ole terminated on hard SAT. IDSTONE Total Depth = 31. ft No Groundwater No Caving A r i! t .1 lt•r_'ea ti SUfa-SLE,'CACE' C,NjA Log € Q:............ .................. PROJECT;..........D amoi d........T.... .r;i 3057........................................................................................................................................ 24" .Bucket Auger lGT% Metfiorf of DriiEi:zc:............... ................. -....... .,g.........,......................... ...joggoc' by.......Fr ...... Job No.. ..6$..."..Q1................. ot 53 Wagn..' in LandGroundElevation: ....... $$1................ locaion..........,i p7 -15 citeObserved: ......................... r{ Al4` ram`. .47J t 4' S rS JCQ L•, t y05t Jv/yf/ (0 `tip ¢. ,o DESCRIPTION WIL THIS TOPSOIL: Dark brown, salty CLAY, firm, slightly moist HEATHERED BEDROCK: -Thinly bedded - SILTSTONE with some tan SANDS`1'ONE. bedrock loose, but continuous to 161. Attitudes near horizontal. C 151 -- BEDROCK. tight, well bedded, Attitudes continue near horizontal to bottom of hole. Unable to pene- trate resistant BEDI GCK. Total Depth 45' No caving, no groundwater Crr't FAA ii, 11 .: } Ci twh ie~ i dA -sS . C , c, la rid li fir . xI G-a f£ : DP- Log E oo .......R .I .................... Diamond Bar TR 30.578 ............................................................................ pRo3uGi: ....................................................... .. ...................... 2 'r.,,.! L1G`, . ,.,.'? ?g........ ................ .....l.or c)or, isy..,.. ?,.,r....... ............... jola REo.l.-.G.B.-..D1.-.5.0........... 1,leihad of Drilling; ..•.,•.•.•., Locoliok:.,.7 C..t..33...' ag.03'L...`.l','1..iain-..Lanjo......................Date Observed:.1/13/.C. Ground FlevcEEkan:.... .Q 3.4••..•.••••• ....... VDOpc,Sell TTSF j 5 10 15 5- BEDROCK: Puente Formation, Tan to brown siltstone and sandstone 2' N55E 3NW. thinly bedded tan silt - stone .( moist, hard) 5'- 7' N85W 5NE tan, medium sandstone bed 71r- 9 z' Interbedded siltstone, slightly folded 91z' - 10z1' hard, well -cemented sandstone bed Below 10' bedrock dry to slightly moist, very hard 13' T:65E 4NW 14' Joint direction N85E, vertical. Slightly open in rather dr-y sandstone and siltstone. Bedrock becoming dry 17' N50E 8oNW - Bedrock weathered to mottles colors of yellow -brown 20' N60F 11oNW - thinly interbedded siltstone and sandstone. Moisture content slightly increased_. Manor_ shear plane along bedding. 2W - 1/4" open joint oriented N801,+1 65-- 70SW, in .12" thick, hard sandstone - bed. 24' N85B 1ONW - minor shearing parallel to bedding 27' Bedding horizontal 30' N40W 1-205W 35' N60E 60NW -- bedrock continues same as above j 40' N45E 6NW. •- bedding continuous to bottom of hole Total - Depth - 43 feet No Caving No Groundwater C_\ H 35 Kobgert Stone k y Associates, Ii-1C. y SC a`' rwt UG"YFi^iCE W c''\ A log i o.---S--------------- Fo3 cr. Diamond Far -- `Tract 30578 Method of Drilling- " Bucket Auclf-',n--------------Logged by____1-J-''. ---Job lJo. Ground Elevation:------------l.ocatiow --Lot--54__--W-a_gaD-.Train-—,,ane------Data Observed;_1.3; o s. Description Sai 1'es SHALLOW SLUMP: Weathered bedrock with caliche. Bedrock appears disturbed, brecciated, rotated. Note: This slump is also exposed in adjacent dozer trench.) 13' base of debris N70B 9°NW BEDROCK.._ Puente Formation lnterbed-- ded s ltstanc and sandstone with some caliche:long joints. Bedding con- tinuous. ram:. 18' N25E 4 NW 22' N85E 3N t7 24' Joint. surface N75E 80SE 25' N70B GNW slightly moist 29' N45B 7NW 30'--31' i-lard sandstone bed T_ w 32' N55E 6NW bedding continuous to bottom of hole f -- Total Depth 35' No Caving No Ground Water S_!.',+ST 4 r 7 Li-..7 C. l r i !:"ii fi- C F •'r '..."i".+'.t k: [i-1 l [^ a .•:„ A. SUP, -5 U R I A C E DATA L o cJ T.....:.............. PROJFCI'. •....11iamond..•Bar.......,.. Tract...3Q.5.s1................................................................ mefbo d of Drilling: ............ .4. ....B.urh•et•... Auq..e_r....................... Logged by. ........ P,,.E., ..... ...... . Job NoJ._GR. 50,1-50........ Ground Clevafion:..........j ...•.•......... Locafio«....?Z ai..•.? ... .igt.... 53... ....W' ;A Tr-ain... pcj,e Observed: DESCRIPTION SOIL 7EST5 TOPSOIL: 0-9' Dark brown silty clay i"soist, firm) M 9' •-16' merges downward to mixture of soil_ and bedrock debris 16' iv80E 40SE fractured weathered t bed ocic 21' 1v75E 25SE i 29' N40E 13NW SHEAR PLANE: Developed on firm bedding. Slickensides nearly down ' dip of bed. Bedding firm and con- tinuous around hole below SHEAR PLANE 3Qw-- w_._ EDPOC C: rPuen e I'arn ation: Intea-buddcd tan to orange s:i.ltstone and sandstone. 4TT 31' -321z' moderately hard sandstone bed 35 35 NGOE 81 W Below 36' color_ changing to alternatin orange and black. Ylater ial becoming more unoxidized with depth. 40' N35B 14oNW - bedding continuous 40 to bottollt of hole. Total Depth 44' No Caving No Groundwater 0 5 30 3( 3 j Robert Stone & Associates, Inc, 5UR-S URFACE DATAr Diarttond Bar Tract 30578 Method of [7rifli z -_24-" ,]3urJcc T ucer_ _ Lon: >c! ........Joh No, Ground Flevut'sort: -- BLLQw _Lc7 _55 ti4!c3_ OT2 `' _ n Lc117C' Eactxti n: --- _--.t__ J___'_.,._--_-_-_.._ r 4) L•yt Description TOPSOIL: Dark clzocolate brown, clayey- SILT, grades downward into brecciated sandstone and siltstone, Shale encased in orange -brown clayeysandmatrix. SLIDE. DEBRIS 12' Large blocics of broken, discun-- tinuous sandstone and siltstone. m- 15-1b,'....hi tish calich Bc- zon(dry) edrock br ecciat_ed SLIDE. PI,AN-.E 1 Islicks 20 ,'N30E 6N.W. slicks oriented N50W, well defined, Material above slide plane and ay inpartbederivedfromsoil. Bm BEDROCK: PUENTE FOP AT_ION Belo ^' 20= z' bedding cone .nuous around hole 2212--25' Massive tan SANDSTONE 25' N45E 90N.W. Below 25' - Interbedded SANDSTONE and orange --brown SILTSTONE, firm, unf_rac- tured. 28' Streaks of black; un.ox.idized siltstone beds 34' N30E 90N.W. Bedding continuous to bottom of hole Soft Test Total Depth - 36' No Caving No Groundwater 5 10 15 2 25 3 35 R bert Stone & Associates, Inc. SUP,- UR'.1-ACE DATA € og 11ti"o ....W......................... PROJECT........" Diamond Bar rract 30575.................................... ............. ............... ..................................................... ......... :............ lYletl:ocE of IDri€€ing: •'z. :.:..I3 Cket. AL.t G..................... .,...,taagad lay..P Gii................. July I lo.:1•-• 3•-•30 0 ...... P. ;• .... ....... Cyround F.levc[iall:,....;::......... ......16cation..LQ. ... 7.e.... ! 0 7....`'?,: X.... t ....................Gat Ofservecf:..a.:l Q%7,p... c o {C _ t e P , JS r .;: Q_ `1 QF 11• UCSCRIPYIOIf SOIL MTS TOPSO-CL: Dark chocolate brown sandy clayey SILT (moist near top). Grades down.to orange -brown subsoil with steal b fragments . SLIDE DEBRIS: Drecciated SANDSTONE, Silts -toile. 15' Bedding on north side of hole 1,00E, 7oS.-E, Beds not contin>>ou.s to south side of hole. 17' Beelding on west side of hole TT70E 450S.E. Gentle dips on east side of hole, but not cont- lm;.ous. Bed generally broken but tight. 24' N60E 17S.E. Bedding is nearly con- tinuous except for narrow zone tight, dry). 31' Sandstone bed with carbonized wood fragments. BEDDING near horizontal, same brecciation. 32' 1/2" open Fissure 32-33' Orange --brown SAIMSTONIE (very 35' SLIDE PLANE_..I ate ial beddii7 continuous belo«r plane, l recciated and sheared above plane. No slick.; observed. SLIDE PLANi.,. eytremely sznaoth. 36'--33' SAMSTONE bed, firm unfracturec N10B 3.30N.W. 45 Ro ert Stone & Associates, Inc. SUB-511PRFACIE DATA Lag N0.--------- •------- Di amond Bar Tract 30573 i''RJjrCT;------------------------•.---- ---------..--'----------------------------------------- Method t)rillir•- 24" Bucket Auger PE GH 1441-6 0 -50_ _ Loggedicy_ ---------------.-.fob Na3 - -- Graurul Elevation:--90_$- --------- Ln. mserveu: _3:7 ZQ ell V C~ ,' a'' h `T•tr ;• d oho ° r-t' SUET T Si Jc`- y'w'Fc. t• o;;, f seri tion C 4 TOPSOIL; Dark brown Silty CLAY N` SLIDE DEBRIS: fir r, 3' Brecciated bedrock, no continuous bedding 1- 7- 10' Soil filled fissure oriented N5W, near vertical, about 1" wide, r filled with Loose debris 12' N15E MNW, SANDSTONE with Silt-- stone i_nterbeds . Beddinq disrupte by vertical soil filled fissure, J3 o — _ ss hole, Gam' k 19' Diameter or hole narrow to 18". 19 x' .Soil filled fissure extends to at least 1912' Total_ Depth - Hole termination on hard Sandstone bed No Caving c No Groundwater f i s ti a Robert Stone & Associates, in.c. SUB-SUIV,U'ACE DATA P.CJEC'i: Diamond Bar Tract 30578 ME.-liod o [?rillilz 2 "__ I3uC).ot huger---------------- Logged b PEf GH---------..Job ------ 9 70--__I.ocn#ianX'ot-_5 3 , i^7ac On -'T'x ck1 37 I,J1C - _ ___ __ f}€#e C}€;fieraed: _ t C?- %; •---- C rautzd Elevation: .....__.____....... V . y/ Q ,` tip Qti 14 aR [h ILI C h Description S& Tesi l TOPSOIL: bark chocolate brown. silty CLAY grades to mixture of soil and Bedrock Fragments. z; 5 b a i 6 aoc a f Y 1 CI 7-- SLIDE DEBRI: Sharp boundary between ovorlying mixture and chocolate brown top soil. 13' --26' ' Soil grades into shale breccia. l 27' N60E 40S.E. interbedded SILTSTONE x and Shale I 31' Open fracture filled with loose debris 34 ` Open Fracture continues SY"r3 4 15 0 55 65 PRO R-IC7;,_l i trlonj- Bar Tract 30578 Wfliod of Drilllneg: --- 24-"__Bucket Auger _Logged byIPE/GIi ----- Job No. l-68- 301--50 Ground Flevation:---- 70 '-Locat'iort-Lot -53, ,Wagon Train Lane --- -- -gate Observed :1/20/70 10 4``'` q' CAP OcQ G cl `,` yt,- e 4; ''La `C v y,i s• (L'SCCi?°ti i2 SG11. TESTS S11DE PLANE: 41Y Fracturing terminates abruptly on shear plane N10E 8N.W. Material immediately above . plane highly brecciated. Plane parallel to underlying bedding. P Plane highly polished - no slicks BEDROCK-PUENT_EH %L<AFORI'TTON: 2--1 Interbedded S1'LTSTONE and SAND- STONE . 45' N35E 17N.W. -- Massive tan SAND- STONE Bedrock becomes uno,.idized with depth Not loc;ged _below 451 -- end of ladder I Total Depth 60' No Caving No Groundwater