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Home My WebLink About30578 (381)Final As-Graded Geologic Report Rough Grading Completed, Tract 30578, Diamond Bar, California We. ahe /-13,-?/ 4oidel,,Jo --- Robert Sloneve Associates 1) e r t S f as if e & A s s c i art e , I n c ara aaau 19720 %Tntura Boulevard - VVoodhnd INN, ClOomia 9-1364 213) 346-0565 - (213) 873-TiH2 November 5, 1970 1-68-301-0) 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: rJARA We have made t.&AAM4.0 02"Y jan?"110 inarl7tior. q Ot t4c 7-1,-,.- ject tract during grading, as required by the County of Los hngeles. Rough grading of the tvact is now completed. This report presents our opinions resulting from Lhese inspections and supplements our prior reports. Enclosed is the final As-Gxaded Geologic Map and selected cross- sections. Cross-sections have been revised in those areas wher(" major design changes have occurred during the progress of the grading. The revised sections ref3ect 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 tra&:, have been included with this report. Ule following reports have been submitted in conjunction with the developnnnt of this tract: io E. L. Pearson and AssociaLas 1-68-303-09 Novembar 5, 1970 Page 2 30B NUMBdid I-,' SUBJEC'1' 1/13/69 68-311, Gyading Plans 2/3/6(,,) 68-301A Addendum Geologic Report, Grading Plans 3/21/69 68-301B Grading Plans Addendum 3/21/69 68-301C Supervised Compaction Sport, Pavilion Axna 3/24/69 68-301D Geologic Report, As -Graded Pavilion and, Parking Area Sites f/2 d. 68-301H Geologic ReporL, As -Graded Sales Office Site 3/25/69 68-301F Geologic Report Pavilion Area and Sales Office Site 3/26/69 68-30IG Additional Data 3/27/69 68-301H Graded Slopes South and East of Pavilion Site 3/31/69 68-3011 Addendum ConTaction Rnport, Tract 30577 Pavilion Riding Area and Dike Section 1/33/69 68-3013 Addendum Supervised Compaction Report, Sales Office 3/31/69 60-301K 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 68-3011 Addendum Report, Fill Slopes 4/10/69 68-301M Addendum Geologic and Soils Report Proposed Model Lots 127 and 135 4/10/69 68-3011 Filled Ground Peport - State of California Division of Real Estate Report 5/1/69 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- 30 1Q Addendum Report 5/27/69 68-301R Redesign of Proposed Grading 5/28/69 68-301S Additional Soils Engineering Information, 68-3011"° R-2 Lots 170-176 Monthly Rcport #26/17/69 Robert Wone Asso"ciales E. L. Pearson and Associates 1-68-301-09 Novomber 5, 1970 Pago 3 JOB NUMBHF SUBOECT 7/8/69 68-301MR-3 Monthly Report No. 3 Geologic 7/11/69 68-301T Lot 135 7/15/0) 68-301U Addcndum Report lot 135 S/28/69 68-301V Redesign of Proposed Grading, Lots 46-49 7/28/69 68-30IN Lot 135 8/15/69 68-301MR-4 Monthly Papaxt #4 8/25/69 68-30ISMR-5 Semi -Monthly Report 5 9/10/69 68-301. Redesign of Proposed Grading Lots 68-69 9/11/69 6B-Y0MR- Semi -Monthly Report H 9/22/699 6B -301Y Review of 5:1 Cut Slope North of Pavilioi:i 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 68-301-002 Supplementary Report, Lots and 69 1-/20/69 G8-30 00A. Redesign of Proposed IC Grading Lots 59-62, 10/22/69 Semi-MonthlyReport R-9 68-301_-00 10/30/69 68-301-00 Semi -Monthly Report 10 SMR -10 11/5/69 68-301-00AB Redesign of Proposed Grading Lots 50-55 11/7/69 68-30ISMR-11 Semi -Monthly Report 11. 11/10/69 68-301-OOAC Supple"ontal Geologic and Soils Report, Lots 59-62 11/21/69 68-301SMR-12 Semi -Monthly Report 12 12/1B/69 68-301-00 Semi -Monthly Report 13 SMR -13 12/23/69 68-301-00 Semi -Monthly Report 14 SMR -14 1/7/0) 68-301-00 Semi -Monthly Report 15 SMR -15 1/9/70 68-301-02Z Supplementary Report an Corrective Grading Lots 23-30 and 170-176 1/12/70 68-301-01 Geologic Report Lot 81 Robert Stop"ic & Ass,.)ckltes, E. L. Pearson and Associates Novenber 5, 1970 DAW 170 2/2/70 2/2/70 2/S/70 2/27/70 2/5/70 2/24/70 3/6/70 3/26/70 4/7/70 5/4/70 5/11/.70 5/12/70 7/22/70 8/17/70 8/20/70 JOB NUMBEP, 68-301-00 SMR -16 68-301-04 68-301-04 68-301-04A 68-001.02 .D 68-301-04B 68-301-03 SMR -17 68-301-03 SMR- 18 68-301-03 SMB -19 68-301-03 6B-301-07 0-0153-00 0 -0153 -DOA 68-301-12 68-301-12 68-301-12 1-68-301-09 P a go 1'k SUBJECT' Semi -Monthly Report f 16 Compaction Report, Lot 1..35 Geologic Report (Rough Wading Completed) Lot 135 Addandum Report, Lot 135 Additional information Steeplechasc. Shear Keys, Lots 23-30 and 370-176 Addendum Compaction Report Lot 135 Semi -Monthly Report #17 Semi -Monthly Report #18 Semi -Monthly Report #19 Final Semi -Monthly Report Study of Soil Coment Mixtures Final Geologic Report Lot 148 Foundation Engineering Report Lot 148 Addendum Geologic Report (Rough Grading Completed) Lot 81 Lot 81 Mayes Geologic Inspection F Robert S Robert S" "' ion of landslV usewers. With the exception of the i between Lots 155 and 156, sewer alignmer ements were mapped and inspected by an prior to backfilling. The force main en made as of this date. The informatior ctions is shown on the attached Geologic 89. etween ba,se map Very ROBEIR And B Safetym fl m IN PRORC F Ujimond.Bar WAY of DrHkr,,):B,t.;(,:kat Augur AC!Xpd by P L /M PNo..,.... 68,r, 3-,') 'j, J)We obsa:vc(L, 011 0 lsoi I'eo Tan SANDSTONE and occasiona] siltstone and shalc interbeds slightly moisL, fractuxud)" 115' E -W, 14N un SILTSTONE bndi. SANEWICYNEP' Via Y hear Plane in MUM= Tar in SILTSTONE bed Shear planc, Win 1120W, noarly horizontal (curvod slicks strike iorlh) ToWl Depth 36' No walar - No cavin(j I'll, gm 1 1 Y0ni"""" " ' " , " "' +": = 2 a z I tC14 know 2 . to to A , ="""I SUR -SURFACE DATo A Log PRORCP . .............. ...... ---- IV BuckotNWTudof Gmuml ERva6mJAR--------AocuWnv ....... NSA. 0011- ........ .... --Date S51 TestDescription Tan to brown SANw DSTONE with occaN.Ional.' 1 Pon" 1. a "W A siltstone interbods 31-JgO north dip 00 MY Now,- z' Room: A' mmoub"'I"wj :'. Y' -c 1.-] ack GILTSTONE mud SANDSTONI.,` S, 17 2 on shear plam! 131 N Total Depth 16' No water -,- No caving I 25 m m IM Log No.— v—, — -1 of , 1. 1; ,, /M. E. F" 'j"")' No.. Lolque! Q Am Mn.— - . . .. ..... .... . . . . . . Dal Ohem"h Predominantly tan SANDSTONE wiM SILTSTONE intorhadsHIM, 3' - IN20M, ODD NW on 6" siltstone some openinsandstone, fractured MAN': I Open fractures to 1/2", roots ba SANDS TOM[,,' VMS Crushed, Macturod i-',''-'Wxy na-- — - Shleqqr P r w r, with some roots N A 0 Black unoxidized SILTSTONE withy, SANDSTONE Anterbods (slightly moist, firs continuous, tight bedding P65 W. 17Nn Total Depth 26' SKI Test K" G':10n:14 Shymy A AnnOWAY Lot Sm 13 - 1110 FwAS: E DATI 1.00 i;," Ilk")", ACJ Alf-pynd 3r P ROJECT: DAMP hYP. M M. E - R Jolt No—W 301.... Wood OF 10mad d Or"'Vcaiow 070--mms"M TrYan ........ S SMI TM Ekmip lon e3:'/ el" Ent(.rbodded SILTSTONE & SANDSTONE slightly moist to dry, fractured to fairly tight) udding NGO 0 E,15 0 SE in Siltstone ANDSTONI], ntarbedded SHNSTONE and SaNDSTONE 1' led clay , shear pl-Y, 16 - a IS1011S -1 C 1435 W, 17 NE slicks strike N20 . , Inarbedded tand and brown SANDSTONE and SILTSTONE (slightly moist, Light, continuous bedding) Bedding N30 0 W, 18 0 NE 40' Total Dupth 391 SUBSURFACE WMA Log mcau" wa 71 NWbod of DAMW ... .... by Job 1"40, Gmund ...... Ile ?A y H, 53 WS1 "W/Iwn snu Test DoWpHor, TOPSOIL: Dark brown silty CLAY W-011-0- firm) becomes sandy withF depth. Some opon pores below 61. SUBSOIL: Silty clay soil with blocks WIND and sandstonE SLIDE DEBRIS: Discontinuous badding. ti MUNTAU-51ocks with streaks of 1 1,50 13' NWE, I 301 Some SANDSTONE beds Marting at 131 11': Thin bedded SILT STONE (clayey, U "11 I I I moist) N100,9% Bedding discontinuous for the most', part. t CI n cm s to c a 12 SS 44' LJ B,-'S FACE DATIA SMI Test WE; I'%,"!b. D:i, FIROJEC7'e DHM%U sn GI i Nk6od of a y 9441 See mm) 1 6 9 ObscmVe&', Uk,,vfstioru .... .. . ... Ao"dhml I e"/ 45" 4 is 4, I BEDPOCK: PUENTF wnpMATION (Continued) 1i AW t:: wb k)"?J'u`_6K t "I'Tt" _o"T-'_th_' c h o I e below 32'. Thin bedded gray to black siltstone and gray medimc sandsLune. Total Depth 51'. Near refusal, no caving. L n ab ..c to I og bo A cw 3 9 ' due to wa to,"'- lovel and activity of the slide plane 44' SMI Testo e BEDPOCK: PUENTF wnpMATION (Continued) 1i AW t:: wb k)"?J'u`_6K t "I'Tt" _o"T-'_th_' c h o I e below 32'. Thin bedded gray to black siltstone and gray medimc sandsLune. Total Depth 51'. Near refusal, no caving. L n ab ..c to I og bo A cw 3 9 ' due to wa to,"'- lovel and activity of the slide plane L 91 WK 6A2L.Off Mill -5 URFAC E D1A,,'T',r% Lay; m.. .... .......... Wwd of DMAW AAn,Buqket- ,AoMpd by G H Job ...... 980, SY 50H Test TOPROIL: Dark brown silty CLAY ix-TtO SLIDE DEBRIS-, 10':N55 0 E,12 0 N Hole tight, well-bodMI Bodding disconLinuous, blocky, fracturew], Sheared SILTSTONE with slicks Slide Wane U 211. N50 0 E,12 0 N, irregular. BEDROCH tan to gray medium SANDSTONE 0 0 28' W&W, 30"Nh, Near refusa]. Total Dopth 311. No groundwaLer, no caving. i f1c"bert Storm DAL'% Lop D O M W Bar PROJECT: ........... ..... ............. ...... .. .......... ....... Wthod of DtUrvj WAj,Buqkq L—aqggK__ Job PO—WRI . . ... . .. Gmund 10maom WIS.— w 4546a y XV VMS Soil Test E A ,Q( TOPSOTL: Dark brown silty CLAY ti E f some dessication 21"Us to 1 SLIDE DEBRIS 110-tcInt brown medium SANDSTONE anl gray clayey SILTSTOKE A4 a 00 11 4' : Highly fractured with opel'-1Q voids Lo 3/4" wide E -W44 T Possible slide plane. Brecciated 0 0 V085 W,22 HE 0 0 10' 085 W,25 Nj"lry z!' j I WWQI' 14y':N75 W,25 NA Tight hole 411 Clayey SILTSTONE with slicks, some shearing, no , NWE,25 'N.1 probablo AM plane. 24 J31,.',DP,,0CK 1"'U NT FORMATION: lntor-- Jr T '-i Ca coo U °: SILTSTUIE and qray SANDSTONE. Hole firm and well bedded to bottom. LroIM 3 Z 2- 28 : N73 W,23 11 L Near refus"i Total WpLh 31'. No groundwater, n6 caving, Storms d SUESSURFANCE Dark TIA SLIDE DEBRES: Tan to gray clayey, 0bg ' ;'T Wo 6 1) i a m a n d 13 a x" PROJECh....... VITIMPARd tan SANDSTONE, dry, w VB NW%od of WWI pp toggod by G H Job 04':N75 W,100NE, clayey SILTSTONE withc Xi 3 V w md [""' k""""afionk ..Localmm Dascdpllm i, T " j7 ri 1A 1 q i", SLIDE DEBRES: Tan to gray clayey, 0bg ' ;'T Wo 6 VITIMPARd tan SANDSTONE, dry, IrF moderatV -) W-Wlthered, fractured 04':N75 W,100NE, clayey SILTSTONE withc Xi ah ro ........... C& Shears on SILTSTONE E -W48 N sandstone, loose, tan Highly brecciatrad gray SILTSTONE, bedding indistinct, m m mjynd qrm"Tmv pro SAN"Wnm , No bedding, fractured, brecciated Possible slide plane at 191 Thin bedded gray SILTSTONE with som gray SANDSTONE' SHEARED ZONE: No continuous bedding rT' a,TONE, no plastic goug(,.. 26': Bedding highly contorted, frac t ured 26y': Crushed, sheared clayey SILT- 113TONE. Sme slicks - probable slide BEDROCK - 1MVINT FORMATION: Wall b I a cl, SILTSTONE N55 0 W,15 00 Near mfunalt. Total Depth 28'. No groundwater, no caving. Soil Tem A 7 SUB -SURFACE WMA Log L 1 c I, J"?, a 1- P Cy 1' 1, ...... ...... 111.1-1-11--"- . ......... ........ ......... Whod u4 Job uu'q'cl rCorr, 874 ...... 44 SO Test a S C r ji c"Y' rk I MIT: MAxturc of SILTRTONE and ANSTONE fragments (moist, firm) CompaMed shoar-key backf ill. hf I... .!.,d - PUENTE FORMTION: Intor-, tight, WC11 heddwa 0 Approximate: N20 W,10"NE2V1' 7: Unable to pnnaLruLe resistant bedding To Lal Depth 28' ,, No gioundwater, no caving. SUEPSURFACE DATIA WE; Di,aniond 13,ar NWAod oF DMIMW At 7 -hu. clkle"t, -,gulyllyr, by GH Job 13. A'oc, E M 310 DMWPHOrl TOPSDJL: Dark brown silty CLAY firm) SUBSOIL: Brown silty SAND (moist, E TTET- SLIDE DEBRIS: SANDSTONE and SILTSTONE T 'E-iT_T,[th some soil intermixed 12': Sheared SILTSTONE, continuous around the hole 381: OponjracLuras to 1/4" wide Lr 19': Shear plane. Dqrk brown, sheared, CLAY slicks, gouge IN to 2'' t h i C lez N65 0 W,33 0 E Shear plane - 1/ 1 2" thick. Gray clayey SILTSTONE - N40%400E 251: Bedding continuous but sheared N35 C ) W,39 r) h 281: 8" thick loose brown SANDSTQNP 34': I/d" thick moist silty CLAY be(,,k over unweathered dark brown SILTSTONE 1 0 1 N65 -W, 17- 1] ProhnhJe slide plane., V1 BEDP,0(,'X ]ATNTE FORMATION: Thin-, QW h e I d I d - e . d 1-11 6 5_1161 h I LTS T 0 N h Wnabla to penetrate rusisQnL heddinq Total Depth 35' No groundwatny, no caving,, An V1 SLIDE VLAYE,: 3- yougo zone with dark 01157145, plastic CLAY, sheared, S] icke(J NGO 0 W,16 03- BEDROCK - PUENTE PORMATION: aDrR 1 f WAT60- as Neor ryfully-) a3 yy Total Depth 29'. No groundwator, no caving. DA"' A 333 ii o n, d 1,1„a' .” F i"I' ll ("), J, L"'T cl"' ........... ........... ....... ........ 24" Bucket-augey by Job G No. Ab5ad of ....... Date 4, OW" D e, Sea Tea vial;; SANDSTONE' FILL: Mixturo SILTSTONE, S o'T L' NT SLIDE DEBRIS: DisconLinuous hodding. ARM-SILTSTONE and massive 0C SANDSTONE A random and disorientedttitudes SLIDE VLAYE,: 3- yougo zone with dark 01157145, plastic CLAY, sheared, S] icke(J NGO 0 W,16 03- BEDROCK - PUENTE PORMATION: a DrR 1 f WAT60- as Neor ryfully-) a3 yy Total Depth 29'. No groundwator, no caving. 4, SLIDE VLAYE,: 3- yougo zone with dark 01157145, plastic CLAY, sheared, S] icke(J NGO 0 W,16 03- BEDROCK - PUENTE PORMATION: aDrR 1 f WAT60- as Neor ryfully-) a3 yy Total Depth 29'. No groundwator, no caving. 1.------------- . .. ........ . ..... . ....... . ... ..... . . . .. ...... . ..... ............ . . . . . .. Stovic"""', Log No..0111 Diamona Bar PROXCh ...... Mabod Buck c t- a b, Job W .......... nG Wound ....... crycd: W,a I WY SAW muw rorty raven u.0 JIM SLIDE DEBRIS: Tntorbedded clayey tom SIMSTCMEa Randan Es:Itudcs, disoriented blocks II CS , 1: Severely hrocclated 1-3"" thick. SheaYed, 6 Q PUENTE POPMATTON: Thh'. Sun - 1 3 j , " 1er, no caving. SAW b t V,,1,,,) ........ DIAMOND BAR TXact 30578 PROJECTn- — . ..... ---- ....... ........ ....... ....... lZinch ........... blkwad DAWMm -- - -111.111-1 .... Grvurr(l .......... ........ p, DESCRUMN som IHTS ly, 01LIDE DEBRIS: Brecciated SILTSTONE an S 117, PILL: Loose Ml material from site SlINSTONE and SHALE; tirm, bodding ti, o n continucus around hole; only slightly V, ON 19' BMW ng NSE WE TOPSOIL: Sandy, silty CLAY, AN,. WIT 51 near top, Wightly moi&: near base; contains dossication cracks) ly, 01LIDE DEBRIS: Brecciated SILTSTONE an S 117, 4!,( Total Depth = 42 ft No GroundwaLer Nb Caving 591'J -111,111, - .......... ...... .... .... . ..... .. . . . .. .. .. ..... . ..... . a.. , BEDROCK: PUENTE FORMATION ATE" AtcrboOOM SlINSTONE and SHALE; tirm, bodding continucus around hole; only slightly moist; yellow bro%n,, 19' BMW ng NSE WE WIT 211 Fault oriantod N30qua 2BNE cuts hedding; caliche along fault. @ 22-24' Hard, cemented SANDSTONE bad @ 26-295' SANDSTONE be(d 30-311 Hard, cemantod, SKNDSTONE 32' Bodaing N25W 11NEo. II x 1 it 0% @ 37' Bedding 9W,', a. fl SiltsLonc becoming black and hard at bottom. 4!,( Total Depth = 42 ft No GroundwaLer Nb Caving 591'J -111,111, - .......... ...... .... .... . ..... .. . . . .. .. .. ..... . ..... . a.. , SUESSURFACE DAVA Log bY PH Job t4" 0. Grcm,ncl Ek,'atiom Jow Now, Date 0WemeW7z??zG2--- A, got WQAon I Test 1 4 TOPSOIL: Sandy, Silty CLAY. DnW,,, EAR T -Ary) as WAST-000 —STRAW SHAIT fragments in sand ail atxix Dominantly SANDSTONE with inter bed,,..; of micaccons SILTEWNE and SHALE, moist, yellow brown. @ 9' iso: ding N20W 23NE @ 1Q' opun joints to V @ 115 141 - SANDSTONE bcd @ 14' Twoh sheared BILTSTONE becl orientod NBOW 16N, probable slidc plane BEDROCN: PUENTE FORMATION: Thinly and SUALE; firm, mottled orange - brown W gray-blndk @ 16' N85B 13N'V @ 201 N80E 14N'v,,7 @ 22' Tuxwinated on hard -camanted ShNDSTON1`' Total Dopth = 22 fL No GrnundwaLur No Caving 1 4 TOPSOIL: Sandy, Silty CLAY. DnW,,, EAR T -Ary) as WAST-000 —STRAW SHAIT fragments in sand ail atxix Dominantly SANDSTONE with inter bed,,..; of micaccons SILTEWNE and SHALE, moist, yellow brown. @ 9' iso: ding N20W 23NE @ 1Q' opun joints to V @ 115 141 - SANDSTONE bcd @ 14' Twoh sheared BILTSTONE becl orientod NBOW 16N, probable slidc plane BEDROCN: PUENTE FORMATION: Thinly and SUALE; firm, mottled orange - brown W gray-blndk @ 16' N85B 13N'V @ 201 N80E 14N'v,,7 @ 22' Tuxwinated on hard -camanted ShNDSTON1`' Total Dopth = 22 fL No GrnundwaLur No Caving j M M a SLIDE DEBRIS: SILTSTONE, SHALE, and S L I D H P L A N E 0 r A a n te d N 85W I _' n SILTSTONE ; Slicks trend N20W ly SNIDSTONE, firm, MUM. @ 14' Bedding H70W MUF,' @ 14k-16" SANDSTONE bQ] @ 19' Bedding NG5W 11 NE @ 26' Bedding N7UW 16 NE, SILTSTONE' becoming black and har(,1 @ 311 Uole terminated on hard SANDSTONE Ubtal Depth = 31 ft No GraundwaLvt' No Caving QamyndjRy,jjqFt 30578PROJECT: Mobod DAM, nch Buckof ..147j 8121A Sn e M Pa , DaN 0 home& DHCRWUW'4 SCM, 11 STS a SLIDE DEBRIS: SILTSTONE, SHALE, and S L I D H P L A N E 0 r A a n te d N 85W I _' n SILTSTONE ; Slicks trend N20W ly SNIDSTONE, firm, MUM. @ 14' Bedding H70W MUF,' @ 14k-16" SANDSTONE bQ] @ 19' Bedding NG5W 11 NE @ 26' Bedding N7UW 16 NE, SILTSTONE' becoming black and har(,1 @ 311 Uole terminated on hard SANDSTONE Ubtal Depth = 31 ft No GraundwaLvt' No Caving e r S t c) ri S a t e L o9 N PROMM ROW.W.M act. ........... ..... ....... MeMod of DAM Bucket by NE/GM.- ... 0, Wound.... . 52, 02=0 rain Lane . . ...... Observe&MMIL" v so L UpsVDUCRWMN, 2 ,..,,.,.,».,. ..... . . .. ....... TOPSOIL: Dark brown, silty CLAY, YAQ—Mightly Moist SLIDE DEBRIS: Interbedded light gray tSTONE with some ta.n SANDSTONE. Root fractured open to k". Bedding discontinuous to 41Q1, Dry to slightly noist, fracturv.1 M M M Total depth 43' No .aria.. "U no groundwater Highly fractured, continuous frac- ires can be traced to 41Y feeL 35 ov 41V EPIPEPLANE: Frab cturing ZLb:rup'L.J.y 't, Natas on thin sheared clay bad. Approximate altitude, N 4 0 E 8 N W 41- BEDROCK: o w10N Ain T C I a 1 t g c, S to dark brown, micaceous SILTSTONE with some SANDSTONE . Unable to penetrate resiskant bra drM,,' Total depth 43' No .aria.. "U no groundwater a. SUEPSURFACE DARPA L o g Diamond Bar, Tract 30578 PRORCT................. 11-1-1-1 111-11-1111111- ... - ......................... ........ - ... .... ......... I'" woket Awr Train 1,19--Dwe 7-15-69 61 TOPSOI'),: Dark brown, silty CLhY, J, j gh t ly Mo j VIIIIE' ll,,(' Jill",p",p) BEDROCK Thinly bedded M-Khe tan SANDSTONE, bedrock loo2c, buL continuous tto- 15 Attitudes near horizontal. 0 15' pQjPqQWght, well bedded. Wtituden continue near horizontal n bottom of h0p, Unnbin to ppne- trate resistant bNomUCK. rp Total Depth 45' No caving, no groundwnter 41- 45 I rnwi o' SUMSURFACE WMA Diannnd Bar TR MY,`,' ........... .............. PROJECTn___--------- ------ of M 4Wng CJI ky Jcp[:w NmI=6S=aOl=5U._ Wh__ Loco I h3wMat,52, We CAswv"nIJI3AIU._ Ile DESTI ION Sou n, ax's S BEDRDCK: Monte Faymation, Tan U`. GrUSTAltstnno and sandstone 2' N55E 3NW. thinly bedded to silt - stone (moist, hard) 5'-7' N85W 5NE tan medium sandstone Mcl V -9y' Lterbaddod siltstonere„ slightly f o I d e,,], W-101' hamd, well -cemented sandstone L C(. Below 101' bedrock dry to `kb lightl,,,r moist, very hart:l 13' N65E 4NII 14' WAL direction N85E, vertical. SliqhAy ayun j Yathar dry sandston8 and siltstone. Bedrock becoming dry 17' N50E 8 NW - Bedrock weathered to mottloB colors of yellow -brown 20' NGOE 11 0 NW - thinly interbeddard HIM= and sandstone. Moistur(,,, contuni_ slightly increased. Minor shear plane along budding. 211' 3/4" open joint oriented NBOW 65-70SW, in 12 thick, hard sandsLone 24' gid 85B IONW - minor shearing parallel W bcdding 27' Bedding horizontal, 30, 'J<mw 1 0 35' N60E b"NNI bodrock continue:,;, same as abav(,, 40' N45E 6NW bedding continuous to bottom of hole Total Depth 43 feet_ No Caving No GroundwaLer w b c 1, L Stone 81 ASawl (sliates n c, IA Diamond Bar Tract 30578 PROJECO Melad of Mund n.Lanu.... Dour SMI Ast, DpWwwnV A . . .... . ..... ........ .... 1 1, " - 1, Ely v - - i MAWAT SIAM: Wcathared bedrock with, appcars disturbed, brecciated. rotatcd. Nato; This slump is alsoAM expo.,wd in adjacent dozer trench) 13' base of debris N70E 38' N25E 4 NW 22 ' N 8 5 E 3%,J 24' Joint surface N75E 80&E 25' N70H 6NW slightly moist 29' N45E MW 30'-31' Hard sandAono bed, 32' N55E 6NW bedding continuous U) bottom of hoic ToLal Depth 35' No Caving No Ground watw,: E 101 L o cx, Pjamond Bar Try ... ................................ ........... ............... __ ...... .... ............................ PROJECT n-- ''I 11-11-11'',__ __11111-11111"_ ...... .... f DOM,, !,Buckut Auger,... ...Jono d kb W Low Oc Yo SML IBIS TOPSOIL: U-9' Dark brown siity ciqy 91-161 merges doWnward to mixture of soil and bedrock debAs 16' NGOE 40SE fracturod weathered, badroc]z 21' N75E Wl 29' N40E 13NW SHEAR PLANE: Developed on fjym bed,('1ir'i11` 5 ides nearly down dip of bed. Bedding firm and con- tinuous around hole 1',c,.,]_c>w P1,h]NIE ranqu siltstano and sandstone. 31'-329' modorately hard sandstone bed. 35' N60E 9NV1 Below 36' color changing to alternatin a A oyanyo a,d block. Material becoming vuore unoxidized with depth. 40' N35E 14 NW bedding continuous to batLam of hole. 411 1 Total Depth 441 X No Gr(:)undwahvr' Qj--r; Stone to Assm ' I DATA PROMW A", —,Ao2qy1 by-PGAM .. ..... Job Poo MY ...Am ohow QW. lot. 11, Wam. Train 10 2 3 1UPSOIL: W&C C'Mcolate MI)W31, 6111hi-SI1nT, gradu5 downward into brucciatud sandstone and siltsLone, shaJe encaynd in crange-brown clayey sand matrix. of broken, discbn- tinuous sandstone and siltstone. 15-16' MUM caliche zone (dry) Bedrock brucciatu' SLIDE PLM'L, slicks oriented N50W, slicks well defined,, t,laterial abovo slide plane and myy in part be derjvaa from soil. BEDROCK: PUENTE FORKATIO'Sap around hole 22Y-25' Massivu tan SANDSTONE 25' N45E 9 0 N.W. Below 25' - Interbeddad SANDSTONE and uYunge-brown SELTSTONE, firm, unfrac- tured., 28' Struals W black. anoxidized ana bods 34' N30E 9 0 N.W. Bedding continuous to Wtom of haW Total DQpth - 36' No Cavinj No Groundwater SAI Tw,f j I Sin ' nrwan 10 2 3 1UPSOIL: W&C C'Mcolate MI)W31, 6111hi-SI1nT, gradu5 downward into brucciatud sandstone and siltsLone, shaJe encaynd in crange-brown clayey sand matrix. of broken, discbn- tinuous sandstone and siltstone. 15-16' MUM caliche zone (dry) Bedrock brucciatu' SLIDE PLM'L, slicks oriented N50W, slicks well defined,, t,laterial abovo slide plane and myy in part be derjvaa from soil. BEDROCK: PUENTE FORKATIO'Sap around hole 22Y-25' Massivu tan SANDSTONE 25' N45E 9 0 N.W. Below 25' - Interbeddad SANDSTONE and uYunge-brown SELTSTONE, firm, unfrac- tured., 28' Struals W black. anoxidized ana bods 34' N30E 9 0 N.W. Bedding continuous to Wtom of haW Total DQpth - 36' No Cavinj No Groundwater SAI Tw,f ccAss DAlf'-A i oi i, c 13 a r 3057"_' PROJTC f 2 4, 13 111 V 6 13 3 0 "1 3Lq— 0 "C', f 0 t la) Soil 7"!st 11101) C), I, E D"ar]", C', E5 3 C- 1)t, 1, J:Zl S ri-tedOr'le L 0 Ll C Wl (1, (3 fill -ed v,,J. I I 4 ` 12' N.15ESil,t'-, s to ca -i, n, A, c.,, I. I", J 1, r led Or hcA-e naxa-ow :A,-) 18,". LC flc c t(: rmi. 11"'i Lion onllotal. 11,7 pt 'i Szrrvlsta v. bcicl N (,) C a vi rw. !3 a o d Tract 30578 , b m .,aav VO'r h . ........ .. ...... ...... ark, 40 ..,.., . a ... ,. ,.. , o .... ......... . , hngo-µa;;di ryy..,:"r. a h r.l;',........•. JobY r',. , b„w Ch °!, ,rl-p,,.. .. afldan it ari,Jr i,raddrfla in. .120/70_ 9 a ' fl way t fl „o-a;ePaZL an` a au Al d 'r i iy TOPSOIL: P . DarkwChroa C:e brown sandy dta _1 a T afl aka e down to orange—brown -brown ,rV:YbSr4:p;@ l wi.'%°:oh, h... ofragments. aro, v ftent I SLIDE DEBRIS: te,,.,a.ted SANDSTONE, PAY A r 5.s, z4"PjOul M aw VV ($6ow! north side continuous1f6...° q;N R.ie south side o C hole. rwost side of hole N701 Gentle dipsIps on cast 7 of hole, but i „., . 1 a G a i. e ” , Red r u. s.m ,! 1. cw a ..b e.+e. d. g e'ni a,tly brokuncJa a i w r3, u.uaf}rau , except narrow .d.1dLd.; I i t i, ; k 1,,. , dry). 4 5, 1' Sandstone bed with carbonized E If1 nearwoodflbaYswBEDDING horizontal,ssome br cck.tUonm 1t 4r% Ei y3 y b a 1/2" openn Ir rssnr a P ' Orange -brownJrye) Jn 'ND NO NE (very FF" l 1 Y,..P. p }V1A4N ed E/, PLANE: J35' L1. . b i s o I Y u. t o b re c a_ a..L M.1. continuous e.a n t ti h ea d. a ° d ahove plana. N Gslick,, r FZ11)s d„.,"r ad . W..+ a.GA Er7 .a extremelycSLIDEPLANE m ( k ry b 505561kddk 'r'uf 50 V J 6 a u 0 w SANDSTONE k;" 6° : d, firm , u f ' a b r. ":,'u ° <:" I[rMY, r, 3 d d N.W. fi as 4 5, r) [It, j- t (", I I L " t () 4 1i s,' () c i a t e s nsII SLIDE DEBRIS: Sharp boundary betwev',, WE UFACE W i11 ANyon.A.-VaIr Trac PROJECU .1 - t-01,5718-1, 19'-26' Soil gKades into shale broccia Dam (ywome&L/2U`/"7a.—' D s', c' r a n Sol TUS1 1 Sol TOPSOIL: Dark choculato brown silty EX CLAY grados to mixture of sailIDedruck and MAUS Wagments. 0 211 27' NGOE 40S.E. interbadJed SILTSTQNI-,. anO Shale 2 31' open fracture filled with loose30-1 jvI debris 341 open Fracture continov,, In, ob SLIDE DEBRIS: Sharp boundary betwev',, and cho, olaLe br=n t 19'-26' Soil gKades into shale broccia 211 27' NGOE 40S.E. interbadJed SILTSTQNI-,. anO Shale 2 31' open fracture filled with loose30-1 jvI debris 341 open Fracture continov,, Robe rt Stone & Assoc"Wites SUG-SURFANCE DATA4, Hucket j 0 SO I THTS 3 1-, f j I NF1' J"" 1T11] 1'1 "--'T,nY_I' Wrminates abruptly o:r shear plano NIOE ON.W. Material immediately abovo plane highly brecciated. Plane parallul to under1fiqj beddinq. Plane highly polished no slicks observed. ah p and SAND - 0 STONE . 45' NAB 171.W. Massive tan SAND-— STONE Bedrock becomus unoxidized with awl ep th NQ lngqn6 helnw 451 end A ladde'r pg 501 _ 011'11% 111 1 Total Depth 60' No CavW.'j No Groundwater G 4"