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HomeMy WebLinkAboutm29053-1 finalS. E. Medals & Associates, Inc. F Consultants in the Earth Sciences 3030 South Bundy Drive, Los Angeles, California90066 2131390.4079 216E South Hathaway Street, Santa Ana, California 92705.7141546-6602 SUPPLEMENTAL SUBSURFACE EXPLORATION TRACTS 29053, 34160 AND 34161 DIAMOND BAR COUNTY OF LOS ANGELES, CALIFORNIA for COUNTY OF LOS ANGELES W. O. 605D March 7, 1978 S. E. Medall & Associates, Inc. Consultants in the Earth Sciences 3030 South Bundy Drive, Los Angeles, California90066.2131390-4079 2168 South Hathaway Street, Santa Ana, Catifornia92705. 714/546.6602 March 7, 1978 W. O. 605D County of Los Angeles Department of County Engineer Design Division Engineering Geology Section 550 S. Vermont Los Angeles, California 90029 Attention: Mr. George Franceschini Subject: Supplemental Subsurface Exploration, Tracts 29053, 34160 and 34161, Diamond Bar, County of Los Angeles, California. References: 1) Supplemental Soils Engineering and Geologic Investigation, and Grading Plan Review, Tracts 29053, 34160 and 34161., for Weather - field Homes, by this firm, dated December 19, 1977, W. O. 605D. 2) County of Los Angeles Geologic Review Sheet, dated February 1, 1978. 3) Addendum Geology Report for Tracts 29053, 34160 and 34161, dated February 6, 1978, by this firm. 4) County of Los Angeles Geologic Review Sheet, dated February 6, 1978. 5) County of Los Angeles Geologic Review Sheet, dated February 22, 1978. Gentlemen: Seven additional exploratory borings have been made on the sub- ject tracts. These borings were located in areas where it has been suggested that an ancient landslide mass may exist. Each boring was entered and logged in detail by representatives of County of Los Angeles March 7, 1978 Page 2 W. 0. 605D this firm and six of the seven borings were entered and logged in detail by an independent consultant. The detailed logs of the borings are presented in the back of this letter. This letter presents a summary of observations made and conclusions reached from the additional data. This investigation was undertaken at the request of our client in an attempt to gain approval without the delays that have beseiged this project. A representative from the engineering geology section of the County Engineer has concluded that a massive\' ancient landslide underlies the site, an opinion that is counter to our evidence. The supplemental borings and dozer trenches were made on the tract for the purpose of obtaining additional subsurface data which would allow for further evaluation of the geology of the site. Exploratory trenches, access roads and drill pads were cut using a D-8 bulldozer. Exploratory borings were drilled using a truck -mounted bucket auger with boring depths ranging from 25 to 77 feet. Each boring was examined by geologists representing this office and all but Boring 13 was examined by an independent consultant. Descriptions of the materials and geology observed in these borings are recorded and illustrated in the enclosed logs labeled A-9 through A-15, attached at the back of this letter. S. E. Medal! & Associates, Inc. County of Los Angeles March 7, 1978 Page 3 W. 0. 605D The geologic data obtained from observations of these borings and trenches supports the conclusions by this office that the proposed tract would be situated on intact bedrock that has been cut by several faults with local warping and drag. Massive landsliding has not occurred. The only boring which exposed evidence of sliding was Boring 12, located adjacent to the area of an existing slide in the very southwest portion of the property. This portion of the slide was previously mapped as thick coll.uvium which was penetrated by Boring 12 encountering slide debris. However, this finding does not change the pre- vious recommendations in this area since recommendations in our previous report called for complete removal of all slide debris and col.luvium affecting the proposed development in this area. The site possesses geologic conditions which, if not properly treated, could be problems if remedial measures as recommended previously are not followed, it is our opinion, based on the data we have obtained, that these remedial measures are adequate as presented in the referenced report entitled, Supplemental Soil Engineering and Geologic Investigation, Grading Plan Re- view, Tract 29053, 34160 and 34161 by this firm, dated December S. E. 'N— adai! & associates, Inc. County of Los Angeles Page 4 17, 1977. Respectfully submitted, S. E. MEDALL & ASSOCIATES, INC. MICHAEL I. BRACHER Project Geologist DAN R . EBERHART C.E.G. 965 MIB:DRE:SEM:dk March 7, 1978 W. O. 605D SHELDON E. MEDALL C.E.G. 51 Enclosures: Geologic Map, Plate IA Geologic Cross -Sections, Plate 2A c: (2) Addressee 2) Weatherfield Homes, Attention: Mr. Glen Brengle S. E. Madaii & Associates, Inc. S. E. Kledall & Associates, Inc. BORING LOG Project Weatherfield Homes Boring No. 9 Location West of Tank Tract 33205 Surface Elev 840'± Logged byMIB/DRE/SEM W.0 605B Drill Date2/23/78 Driving Energy w a 3 a: r w o 4 o J v z a- cD UNIT (soil, fill$ alluvium, siltstone, etc.) MATERIAL DESCRIPTION {%sand, silt, cloy; color, consolidation etc.) ATTITUDE MEASUREMENTS: B-Bedding F-Fault J-- Joint RS-- Rupture Surface C- Contact S- Shear m 0 10 as a M o O r' Lj z J a `° C•CORE B BAG z a s i o w° C z u w dE 0 26' B:N40E 8-11N4 J:N40E 84SE (tight) Well -developed joint coated with manganese oxide. J:N45E Vert. 31.5' Shale bed, light brown containing mica and carbon flecks. B:N25E 9-11NW Siltstone, dark gray, hard,moderately laminated. 45' B:N35E 10NW J:N15W 48NE T.D. 50 No caving, no water encountered. 0 f j Sheet 2 of 2 S. E. Pyladail & Associates, Inc. BORING LOG Project Weatherfield Homes Boring No. 9 Location West of Tank. Tract 33205 W.O 605B Drill Date 2/23/78 Surface Elev. 840'± Logged by• MIB/DRE/SEM Driving Energy 3 LL w o c, Er 0 UNIT (soil, fill, alluvium, siltstone, etc.) MATERIAL DESCRIPTION (%sand, sift, clay- color, consofidation etc.) ATTITUDE MEASUREMENTS: B-Bedding F-Foult J- Joint RS- Rupiure Surface C- Contact S- Sheaf J NCi 6CL o M cUno U\ j z_J tu Co C-CORE f3-BAG z o n r cc p w_ U)w o- o 0 Topsoil: Silty Clay, dark brown, CL moist, firm. j, HOT Weathered Bedrock: Sandy Silt containing scattered fragments of shale, moist, ML III ;,k1! f firm to stiff. Bentonitic Ashbed, light yellow -brown, 2 to 6 inches thick, very moist, stiff. Bedrock: Interbedded Sandstone and silt - stone. Sandstones are light gray -brown, L -_. hard and slightly friable in 1 to 6 inch beds. Sitstones are light brown to dark gray, moderately bedded to massive 2 to 4 inches thick containing 1/8 to 1/2. inch laminations. @8' B:N60E 13NW approximately. r at 9' minor shears, tight 1/4" gouge. Siltstone slightly dragged with the east side down. S:NlOE 85SE. 12' Bedrock is moderately hard and weathered, slightly fractured and an occasional rootlet. 13' 4" thick concretionary sandstone O - J:N25W Vert. J:N40E 70E B:N40E 6NW 16' Sandstone,very hard,medium gray, slightly friable. Siltstone below. 18.5' Sandstone and Siltstone becoming very hard unweathered, dark gray to dark greenish gray. 22' B : N28E 9NW . Sheet I of 2 S, E. Madal! & Associates, Inc. Project _-Veatherfipld Homea_ Boring No. 10 Location West of Tank Tract 33205 , W.Q 605E Drill Date 2/24/78 Surface Elev. 800'± Logged by DRE/DM/SEM Driving Energy 3 U x o v_ x cD UNIT (soil, fill, alluvium, siltstone, etc.) MATERIAL pl*SCR{RTIbW (%sand, silt, clay; color, consolidation etc.) ATTITUDE MEASUREMENTS- B-Bedding F-Fault J- Joint RS- Rupture Surface C- Contact S- Shear m L; o X UJ-, 3 z aal C-C-ORE B-BAG o z oW a o Topsoil: Silty Clay,dark brown,moist, CL 2' grades into 1 Clayey Sand, medium brown, moist, medium, dense. SC 6' numerous thin caliche stringers. Weathered Bedrock: Silty sand below 6' with scattered 2-6" SM siltstone inclusions. Fault zone, weathered with considerable caliche, bedding dipping steeply on north- Lack lc` A. west side of hole and dipping slightly to the southeast on the southeast side of the hole. 012' Friable sand, moist, dense, some roots. C 14' Interbedded sandstone and siltstone, siltstones are highly fractured between l sandstones sheared surface. S:N30E 14SE h 15' Sandstone bed 4" thick,very_hard- and fractures appear open 1/2 - 3/4 inch. ' 10 -_:". 17' Sandstone and siltstone becoming more intact. Bedding somewhat variable B:N75W 11SW. 18' Shear zone 2 to 4" thick containing gouge and broken rock. FN70E 64Nt4 on the nrotherly side above the -zone there are numerous,slightly, open fracture within a very bzi"_ e ca careous siltstone B:N60E 10SE @21.4' interbedded light gray thinly lam- inated siltstone and dark gray -brown sand- stone. B:N80W 11 SW. Moderately hard, sandstone beds are approx. 8" thick 2-4" siltstone beds. Marked by 1/8 - 1/4" laminations, B:N65-70E 8SE Sheet I of 2 a in Project Weatherf.ield Boring No. 11 Location Surface Elev. 785'1 B O R I N G LOG S. E. Nledall & A3aociates, Inc. GEOLOGY AND DOLL ENGINttRING See Plate 1 Logged by Ate DEE SEM W.p 605D Drill Date 2/25/78 Driving Weight F a 3 La LL w 0 0 0 x a- c UNIT (Boil, fill, alluvium, siltstone, etc-) MATERIAL.. DESCRIPTION (%sand, sift, clay; color, consolidation etc) ATTITUDE MEASUREMENTS: , B-Bedding F-Fault J- Joint RS-Rupture Surface C- Contact o NU a 0 n W n w 4Q a m C-CORE 8-RAC x a Q p o Dz rnw o U Topsoil: Silty clay, dark brown, very moist, firm to stiff xx @2' becoming medium brown t7eathered Bedrock: Interbedded siltstone and sandstone. Siltstone is light gray to orange brown-, damp, some,caliche and moderately fractured, thinly laminated in 2-4 inch beds. Sandstones are fine to medium grained, light brown to gray,hard to friable in 4-6 inch beds. 1 Competent Bedrock: @5' limonite stained', shear . S: N10E 6 BtM offset with NIE side down. Bedding is slightly dragged but generally continuous B• 1\122E 5SE\ @ 6' Shear 6 inch offset with SE side up 1 .- showing some drag S: N75E 67MI Sandstone below 6' showi_ng cross bedding @ 9' mashed siltstone bed between sandston beds. Sheared clay olive green l;l 1/32 to 3/4" thick B: N1OW 10SW @ 11'Shear S: N25E 54NW 10 i Sheet 1 of 3 PLAT 11 S. E. Medall & Associates, Inc. 13O I NG LOG Project Boring No. 10 Location West of Tank Tract 33205 Surface Elev. 800'} Logged by DRE/DM/SEM W.0 605B Drill Date 2/24/78 Driving Energy a W H w ZS c c u UNIT (soil, fill, alluvium, siltstone, etc.) MATERIAL DESCRIPTION (%sand, silt, clay; Color, ATTITUDE MEASUREMENTS: consolidation, etc.} B-Bedding F-Fault J- Joint RS- Rupture Surface C- Contac.t S- Shear m N a- 0 cc n0 aiQ W G1 C-CORE B BAG Fy' z a " a Cr z UJ 0Z @23.3' B:N45W 14SW J:N5--10W Vertical @25' Friable sand bed 1 1/2" thick, ' undulatory with bedding varying from horizontal to N70E 11SE. @25.8' Sheared contact between a dark brown sandstone overlying siltstone. The underlying siltstone bed has become sheared and slicken in a zone 1-2" thick. Appears to be due to tectonic deformation of an incompetent bed, not a slide. 27.6' Bedrock below is predominantely sandstone, dark gray to brown, thick bedded with cross bedding. J:NllE 84NW J:N50W Vertical BN60-8014 10SW @29.3' Siltstone, light brown with interbedded sandstonetr B:N75W 10SW (approx.) @31.5' bedding has become consistent and uniform B:N85E 11SE @35' Shear with 6" offset of tan siltstone B:N50W 17SW S:N20W 74SW northeast side is up. @37' Thinly laminated siltstone B:N44W 17SW and cross bedded sandstones, very hard and tight. T.D. 47' No water encountered. No caving. Shek't 2 of 2 4. «r- c- A-10 Project BORING LOG S. E. kledall & Associates, Inc. Weatherfield GKOLOGY AND 201L [NGIN[ihING Boring No. 11 Location Surfoce Elev. 785'± Logged by A1IB/DRE/SF-M W.0 605D Drill Date 2/25/78 Driving Weight w Q 3 LJ z w o 0 a B-Bedding c UNIT (roil, fill, alluvium, siltstone, etc.) MATERIAL DESCRIPTION (%sand, silt, clay- color, consolidation atc.) ATTITUDE MEASUREMENTS: F-Fault J-Joint RS-Rupture Surface C- Contort m o o 0 too W - 11i C-CARE B-BAG w a a Cr w° Nw o~ 20 13' Bentonitic\,bed 2" thick,gray, moist, stiff. Bedrock below shows little or no weathering. Silt:stones are medium gray to dark gray in 4-6 " beds with l" laminations. Sandstones are medium gray, cross bedded in 4-12 inch thick beds. Bedrock is hard, slightly fractured, consistent l B : N55E 15NW / 16' Siltstone bed containing 2" sandston dike from overlying sandstone undula ry, tight with no disturbance of siltstomes above (depositional) 15 ti @ 16,-"Sandstone, dark brown very hard, wit] interbedded siltstone B : N15E 4dW f f_ @ 19' Mashed siltstone, olive green, moist firm, 0-1" thick B: N55E 7NW @ 19 a ` B : N4 OE 1ONW @ 20' Thinly laminated siltstone inter- t' bedded 2 0 9 She:t 2 of 3 P L ! E A-11 Project Weatherfield Boring No. ll Location Surface Elev. 7T8, BORING LOG Logged by D:B/DFE/SEM S. E. M edall & Associates, Inc. GEOLOGY AND COIL ENGINEERING W 0 605D Drill Date 2/25/78 Driving Weight-- w a y w 20 0 c r of 0 UNIT (sail, fill, alluvium, siltstone, etc.) MATERIAL DESCRIPTION Msand, silt, clay- color, consolidation etc.) ATTITUDE MEASUREMENTS: B-Bedding I= -Fault J-Joint RS-Rupture Surface C- Contort m D7) coo V) N w W C3 a C-CORE B BAG z U o n a w° z f F- pI- Sandstones.,hard, very consistent B: N50E 10W 22' Sandstone bed 6" thick,dark brown, well cEmented alternating sandstone and siltstones below ini beds l" thic grading from sandstone to siltstone unbroken, hard, unweathered. B : N55E 131W 25 Total Depth 27' No water No caving Cored bottom 7' of hole Sheet 3 0f 3 Project Weatherfield BORING LOG S. E. Medall & Associates, Inc. GEOLOGY AND *OIL [NGINtChING Boring No. 12 Location See Plate 1 Surface Elev 730' ± Logged by EM/DPE/SE.M W.0 605D Drill Date 2 25 78 Driving Weight w p UNIT (Soil, till, alluvium, siltstone, etc.) of 00 ow w J c MATERIAL DESCRIPTION (%sand, silt, clay; color, Y„ h W C"CORE z x a z za consolidation etc} ATTITUDE MEASUREMENTS: a w B BAG a n v'u' ar w Q B-Badding F-Fault 0 Zm 20 J-Joint RS-Rupture Surface 0 0. 0 0 C- Contort Siicie ris : Wlruviun, saE, y c ay, clark brown, stiff, moist to very zcist. @ 7' becoming an sandy clay, chocolate brown, moist, stiff f @9.7-15' Numerous fragments of sandstone 5 and siltstone in a'sandy clay matrix @ 14'abundant caliche pods and -rootlets @ 16.6' Sand, very friable, iron oxide stained and scattered inclusions of siltstone, random joints 10 @ 18'siltstone, highly weathered, light gray to orange. abundant caliche i` damp, somewhat punky, calichefied zone with mots @ 19.3' Slip surfaces=N88E 25N 2" thick clay and gouge @ 19.7' Slip surface=4-," gouge zone N88E 30N striation on surface in down dip direction @ 20.8' Slip surface --well developed gouge Amy. with abundant caliche 20 N Sheet 1 of 2 PLA T E A-12 y, BORING LOG S. E. Medall A Associates, Inc. Project Weatherfield GEOLOGY AND SOIL ENGINEERING Boring No. 12 Location Surface Llev. 730' f W.0 605D Dri l i Date . 2/25-26/78 Logged by NIB/DRE/SEM Driving Weight a 3 w o 20 c a- UNIT (soil, fill, alluvium, siltstone, etc.) AAATERiAL DESCRIPTION (%sand, silt, clay; color, ATTITUDE MEASUREMENTS: consolidation, etc.) B-Bedding 1=-Eoult J- Joint RS- Rupture Surface C- Contart J m N o o coo o w z a in C-CORE B- BAG i , a 0- r p IrQ r z o0 @ 20.8' RS E-W 29N well developed striatio bearing N30W Plunging 2`t° s @ 23' s inch gouge showing faint strict' t s N10W 3991 siltstone, light gray to orange overlying fine grained cros 25 bedded sandstone. Sandstone light brown very friable to 29' @ 29' 4-6" thick gouge zone medium gray, ff clay containing caliche streaks Slip Mane N50W 44NE with well developed striations, slight groving trendincf 30 N10W Plunging at 320 disoriented sandstone and siltston 1, containing caliche stringers to 34 feet f @ 31.7' thin gouge zone with faint striati ns N70W 33NE @ 35' Base of slide. marked. by 4" zone o 35 brecciated siltstone fragments within a medium gray clay matrix. zone is irregular in a "stairstep" appearance approx. N82E 36NW no slicks. i @ 35' Bedrock: siltstone, light to meth. -- um gray, moderately fractured with iron stains on fracture surfaces, moderately bedded with 4- z" lami— nations, slightly drag affected along base of slide 35' B: N60E 4NW 36' B: N85B 0-5NW 38' B: N10E, 5c'iNW 40' Sandstone light brown, fine to medium grained, well cemented; gib Lal Depth 4 2' No water encountered No caving Sheet 2 of 2 PJ_AT FA-12 Project Weatherfield B®R! NG LOG S. E. Medaii & Associates, Inc. G[OLOGY ANp BOIL [N61NKERING Boring No-_13 Location See Plate 1 W.0 605D Drill Date 2/26/78 S 18 ` -1,- Surface Eiev - Logged by SEl1B Driving Weight w w wCn V a 0 ci c 0 UNIT {sail, fill, alluvium, siltstans, etc.) MATERIAL DESCRIPTION (%sand silt Ga color, cloy- ATTITUDE MEASUREMENTS:consolidation, arc.) B-Bedding F-Fault J- Joint RS-Rupture Surtace C- Contort m cn er o U) o Ir 3 zo C-CORE 8-BAG z c, o a r o w i1— o v F- 4 i i= r Tbpsoil: silty clay, dark brown, moist, medium stiff CL f Weathered bedrock: interbedded sands -Lone and siltstone, brown to reddish brown, moi medium dense, medium grained t, N J 5 Y Bedrock: Interbedded silstone and sandstone moderately fractured, tight. sandstones .a.re light to medium gray and brown, fine to medium grained and occur in 4-6" thick bed Siltstones are medium gray to brown, moderately hard in beds 4" to several feet thick with h-l" laminations General bedding B: N10-20E 2NW consistent with depth, only slightly fractured, very little weathering along joints 0 15 20 9 I f 25 30 l Slur et 1 of 3 PLATEA-13 project Weathertield Boring No 13 Location Surface Elev 818'± O R I N G LOG S. E. Meda91 & Asaociates, Inc. GEOLOGY AND •OIL 974GIHIENUHG Logged by-SB jl= - - W.a 605D Dri I I Date 2/26/78 Driving Weight w aa Uj LL 77 w 30 o UNIT (soil, till, alluvium, siltstone, ate.) MATERIAL DESCRIPTION (%sand, silt, clay- color, consolidationetc.) ATTITUDEMIEASUREPAENTS:' B- Sedding -Fault' J - Joint RS-Rupture Surface C- Contort m o U) o b a C-CORE B- BAG'nU o rx z IV o a clay, dark gray, moist plastic, very stiff bentonitic, horizonal Siltstone as above, little or no weatherin apparent, hard, thinly laminated to massive B: N50E 2-4NVd 35 40 5 50 55 a 1 Sandstone, light gray, slightly moist, very hard,B: N400E 4NW,6" layer Some cross bedding evident within layer Interbedded siltstone and sandstone below 60-. Sheet 2 of 3 PLATEA-- 13 BORING LOG Project Weatherfield Boring No. 13 Location See Plate 1 Surface Elev 8181± Logged by SE/ S. E. Medals & Associates, Inc. G[OLOGV ANA 410IL ENGINEERING W 0 605D Dri I I Date 2/26/78 Driving Weight U.1 w Q 60 o a 0 UNIT (soil, fill, alluvium, siltstone, etc.) MATERIAL DESCRIPTION Msand silt cloy -color i ATTITUDE MEASUREMENTS: consolidation, etc.} B-Bedding F-Fault J- Joint RS-Rupture Surface C- Contort m er o 0 U) a rr ui3zp CL m C-CORE B_BAG z o wo r a zF- a ti V 65 Siltstone, dark brown to black, highly indurated, massive, hard B: N30E 2-4NW 70 75 lmoist, Siltstone, gray to dark gray, slightly very hard-calcaeous slightly fractured with rriangenese staining on fracture surface j lbtal Depth 77' No groundwater encountered No caving Possible gas in hole a A Y I I Sheet 3 of 3 i BO R I N G LOG S. E. Medall & Azzsceates, Inc. GCOLOGY ANp SOIL IENGIN[QRING Project _ tleathPrfiPld Boring No. 14 Location _SPA 1ai-P ,1 W.OhD541. Drill Date 2 26/7a Surface Elev 880 ± Logged by JJB/pIE/MIB Driving Weight w o UNIT (soil, fill, alluvium, srltstone, etc.) J m co p tom„ 0 MATERIAL. DESCRIPTION {%sand, silt, clay; cotor, a C-CORE z U r z a a ATTITUDE MEASUREMENTS: consolidation, etc.) 8-SAC o R o~ W B-Bedding F-Fault o za 20 a J• -Joint RS-Rupture Surface Cr am o v 0 C- Contact Weathered bedrock: sandstone, reddish brown, 1• friable, moist, medium grained @ 2 ' ; 4 " wide shear zone, N7 5E 8 0NW Bedrock: massive sandstone, reddish brown, med_i.uzn grained, friable,. moderately fractur containing q" roots @ 4' undulating srltstone Dyer within 5 _ sandstone 1--3" thick B:1V 2E, 22SF Offset by numerous 1/8" parallel shears; S: N30E, 86SE l= @ 5' Shear zone separates srltstone on west from sandstone S: N35E 68SE @ 6' Carbon particles 4" max.. diam. B: N75E, 20SE @ 8' Water seepage @ base of sandstone unit; disturbed bedding,slicks along bedding planes, moderately fractured, 10 -_ general orientations of fractures N32E 75 Nv Sandstone -yellowish brown, medium grained, friable Siltstone -greenish gray, well indurated, free water seepage at base of overlying j sandstone .. @ 101;14" thick layer of slicked clayey siltstone, dark gray, moist to wet, iron stained, randomly oriented slicker -sides B: N55E, 17SE Becoming hard @ 12' y•. interbedded fine grained sandstone, light yellow brown, well indurated, massive and ccreenishg-ay srltstone Sandstone -- massive, medium grained, light yellowish brown, well indurated. ShaAt 1 of 3 - PLATEA- 14 Project Weatherfield Boring No. 14 Location Surface Elev 880'± BORING LOG Logged by JJB S. E. Medall & Associates, Inc. GEOLOGY AND *OIL ENGINEEFIING W.0. 605D Drill Date 2/26 78 Driving Weight w 15 aCD a al UNIT (soil, fill, alluvium, siltstone, etc.)a°- MATERIAL DESCRIPTIO(%sandsilticlaY colo r consolidation, etc.) ATTITUDE MEASUREMENTS:. 13-Bedding F-Fault J - Joint RS-Rupture Surface C- Contart N r o wB- z _ am C•CORE BAG z oa~ z o Interbedded Siltstone - brown to dark green with layers of dark brown, sandstone, medi grained.. ft.- B :N 45E 3CINW 15 , ft. , B:horiz©ntal f, ' Sandstone -light yellow brown, medium grain cross bedded,with-alternating greenish gray siltstone @ 20';3" thick concretionary sand, 20 stone layer @ 21' dark brown siltstone and shale, hard From 24--28 ' occasional lenses of concretionary sandstone, white to light gray 25 p 0 3 moderately fractured, highly indurated and iron stained from 30--32' Shoe? 2 of 3 _ PLA T E A-14 Project Weatherfield Boring No. 14 Location 5urfoce Elev. 8B0'± BORING LOG S. E. medall & Asmoclates, Inc. GEOLOGY AND $OIL ENGINEERING See Plate 1 W.0605D Drill Date 2/26/78 Logged by JJB Driving Weight w s a 3 s w 0 30 o J c, xa a c UNIT (soil, fill, alluvium, siltstone, etc.) MA`fERIAL DESCRIPTION (%sand, silt, clay. color, consolidation etc.) ATTITUDE MEASUREMENTS' B-Beddinq F-Fault J- Joint RS-Rupture SurfaceLU C- Contact m Uj cna Li o N o uy D w n LJ a m C-CORE 8-BAG z o a r o AW0: z QF iZ @ 34' horizontal bedding \\ @ 35' B : N5E 8w 39' dark gray, highly clayey siltstone, Moist and massive,.grading to silty sandstone with carbon partictes @ 39 -,' @ 411--grades back to sandy siltstone B: NIOE, 991 End Boring @ 50' Note: No caving, water seepage at 8'..j r . vl @ r 35 40 45 Sheet 3 of 3 PLAT EA 14 BORI PSG LOG Project Weatherfield Boring No. 15 Location See Plate 1 Surface Elev 835 11 i- Logged by JJB/DRE S. E. Medall & Associates, Inc. G[OLOGY AND *OIL KWaIAFiERIHG W 0 605D Drill Date 2/26/78 Driving Weight LLJ Sheet 1 o- 2 PLAT1171 15 BORING LOG Project Weatherfield Boring No. 15 Location See Plate 1 Surface Elev 836'± Logged 6y JJB/DRE S. E. Madall & Associates, Inc. GEOLOGY AND SOIL ENQI14[LRIHG W,0 .605D Drill Date 2/26/78 Driving Weight w o UNIT (soil, fill, alluvium, siltstone, etc.) m o w w w 0 MATERIAL DESCRIPTION (%sand silt cloy- y; color, ui r M cn O ww C CARE Z z Z F- z a - consolidation etc.) a ATTITUDE MEASUREMENTS: o 3 a e BAG n 0w8-Eedding F - Fault a Z r o oIrJ- Joint RS-Rupture Surface a o 30 C- Contact @ 30z' horizontal bedding, dark brown, T siltstone with light gray sandstone concretionary beds, iron stained fractures 35 @ 36' well developed joint system J: N5E, vertical,gypsum coated and iron oxide stained, l/16" charcoal, particles within sandstone @ 38';12" thick sandstone bed, light gray 40 hard friable 40 Z'bedding-horizontal slightly undulato @ 41 z' concretionary sandstone 10" thick Interbedded sandstone & siltstone, moderately 45 fractured. 50 @ 50' horizontal bedding 55 @ 55' horizontal bedding 60 Bottom @ 60' no caving & groundwater not encount,- ed Sheet L a-i 2 PLATEA-15 rl r _ r , , _• _ -. , - i ` 1 f % :- _} -- ,` / . x3 aQ '-p•., /. ! r' / I , : i 7 r r j jdj/ pIir- - f 64 c: d m: i; o a - _ .-- p / // f , . /` , o/ can .o,p t L11— / _ ' // a I _ -._ fl ! 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'\ C' \ / \ r-- r - \\ 0 i / 1, en a \ - E.4,333,200.E4'533,200 1 \ \ - ok` \ ors pt ` \ o I r O d\ _ ' \ m; \ F J1 \ \ ,y. b . \\ 48 S \ a \ y1s Bh9 \Mo' 1, o\ d % Q \ \ \ \ a - V \ \ -- L 646 939 \ ' 1 \ Os 4 o \ \ -K . \. p h - m X\ . \\\ \ . ' _ mm v % p \x \ X x \Q 3 - 644 om, p q a . v 4 " ' \> . 1 a N Q \ fb 1 ti \ m f I \\ i .,. . x xl „x f ; cx 7 V x \. i 0 o x b.— . t0Nm- • . . w a ti j 'tn M F_ sNu, U) a a Nei 4 caad W, Y V G-,'.ww 1 .... h 1 h.- _ , 760 720 0 II 640 PROPOSED SECTION II -II I EXISTING GRADE 7- II I S. E. Medall & Associates, Inc_ . Consultants inthe Earth Sciences 3030 So. U-1y fly . Los Anaa ac, Ca. 90W.:213) 390-4079 2168 So. Halnawav 51., S-1a Ana, Ca. 92705. {734) 546-6602 DATE 3-6- 78 BY B-J SCALE L-W.O. 605- D