PT-2 - gmw.consrv.ca.govgmw.consrv.ca.gov/.../APSI_003358_20070126_Plate5_PT2_to_PT3.p… ·...
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PT-2 PT-2 (cont.) PT-3 PT-3 (cont.) 150 130 10 30 50 70 140 120 20 40 60 80 100 110 90 Sta 0 (in feet) 160 180 200 150 170 190 70 90 80 100 140 120 110 130 50 30 10 60 40 20 70 0 A B C D E F H I G J K L M N O Sand bed Silty sand bed shaded where moist. Clay bed FAULT A: N44W/80SW Thickening and thinning of units - strike-slip offset, minor fault. (<1-2' right lateral offset). FAULT B: N40W/85SW (Same as fault A). FAULT C: N36W/68SW Normal fault, approximately 4" of apparent offset. FAULT: N31W/87SW Thickening - thinning of units. Strike-slip offset, minor fault. (<1-2' right lateral offset). Sand bed with shells. Sand bed with shells and orangish red oxidation. FAULT D: N40W/85SW Normal fault, approximately 3" of apparent offset. FAULT E: N32W/71NE (Same as fault A). Bench Bench X Dark mineral laminar bedding, shells in very fine-grained sand unit contains detrital charcoal roots, occasional scattered iron oxidation staining in root-like patterns. Pale yellow (5Y 7/3) to white. FAULT F: N30W/80NE Normal fault, approximately 2" of apparent offset. FAULT G: N40W/60NE Normal fault, approximately 3" of apparent offset. FAULT H: N30W/64NE Normal fault, approximately 2" of apparent offset. FAULT I: N30W/75NE Normal fault, approximately 1" apparent displacement. FAULT K: N35W/80SW Normal fault, approximately 1" apparent offset. Strongly grussified dioritic clast; crumbles in hand. FAULT L: N35W/65-70NE Normal fault, approximately 1" apparent offset. FAULT M: N35W/60-70NE Normal fault, approximately 1" apparent offset. Z like Strongly grussified dioritic clast. FAULT N: N40W/Near Vertical Normal fault, approximately 1/2" apparent offset. FAULT O: N30W/70-80NE Normal fault, approximately 1/2" apparent offset. White - light buff clay layer, possible ash - reworked deposit. Ungrussified dioritic clast. Top of trench. Secondary seismic pipe with + graded sand. Top of trench. Sand boil X : Silty sand (SM); medium dense, gray (10YR 5/1), very fine - fine, abundant biotite. Y : Silty sand (SM); medium dense, light brownish gray (10YR 6/2) dry, fine to medium, moderate cross bedding and channeling, fines upwards. Z : Silty sand (SM); medium dense, light brownish gray (10YR 6/2) dry, fine to medium, moderate cross bedding and channeling, fines upwards. Silty sand (SM); medium dense, grayish brown (10YR 5/2) moist, very fine to fine. 3-6" thick pale yellow (5Y 7/3) clayed silty + ash marker bed, + internally sheared. Sandy silt (ML); white to brown, dry massive, partially (weakly) cemented. (Locally contorted by liquefaction). Sand, light brown, dry, fine to coarse, massive, locally poorly stratified. Sand, locally iron oxide stained, dry, fine to medium, massive, locally warped by liquefaction. NW Wall N61E Sand, reddened, iron oxide stained, massive, dry, medium to coarse, locally contorted by liquefaction. Ground surface Reddened iron oxidized sand, fine to coarse. Silt White silt White silt Brown silt Silty sand Sandy silt, brown, damp. Water level Submerged Trench floor Fine sand Silty sand White ash/silt Brown silt Trench widened, caving. Liquefaction offset AD 43 . Sand, dark olive brown damp to wet, massive, salt crystal precipitate on exposed surfaces. Slough SE corner of existing house. Highly weathered dioritic clast. Strongly iron oxidized sand. Finely stratified sand. Gravelly sand, fine to very coarse, pale brown, dry, firm, stratified to massive, slightly weathered granitic clasts, highly weathered dioritic clasts. Capped by iron oxidized sand. FAULT: N57W/57NE 1/2" apparent vertical offset, east side up. FAULT: N50W/68NE 1 1/4" apparent vertical offset, east side up. FAULT: N51W/65NE 1" apparent vertical offset, east side up. FAULT: N53W/75NE 1/2" apparent vertical offset, east side up. FAULT: N58W/73NE 1 to 2" apparent vertical offset, east side up. FAULT: N58W/73NE 2" apparent vertical offset, east side down. FAULT: N36W/70NE 2 to 3" apparent vertical offset, east side up. FAULT: N68W/76NE 5 1/4" apparent vertical offset, east side down. FAULT: N52W/69NE 2 to 3 1/4" apparent vertical offset, east side down. FAULT: N45W/70NE Apparent dip 50NE. FAULT: N57W/58NE 1" apparent vertical offset, east side down. FAULT: N23W/88NE 2.5 to 3.5" apparent vertical offset, east side down. FAULT: N41W/71NE 2" apparent vertical offset, east side down. FAULT: N40W/72NE 8.5 to 12" apparent vertical offset, east side down. Sand, pale gray, stratified. Ground surface Alluvium, stratified, fine to medium sand, pale green. Light olive silty fine sand. Plastic fragment Styrofoam fragment Orange sand Tension fracture Sand boil plane N35W across trench. Apparent vertical offset 2.5", white. Reddened sand, apparent vertical offset 2". Sand lense with shells. Thin peat, 1" apparent vertical offset. Liquefaction offset N20W/40SW Submerged Sandy silt White clayey silt with ash. Cross-bedded sand. Silty sand/sandy silt, brownish gray, dry, massive, partially cemented. FAULT: N32W/84SW 4.5" apparent vertical offset, east side down. FAULT: N56W/63NE 2 to 2.5" apparent vertical offset, east side down. FAULT: N43W/72NE 2" apparent vertical offset, east side up. Moist silty sand. Silty sand East down East up Strike-slip N58E Z Z 0 10 GRAPHIC SCALE (in feet) HORIZONTAL = VERTICAL LAW Trench Logs: PT-2 to PT-3 Jan. 2007 389-06 The Villas PLATE 5 PETRA GEOTECHNICAL, INC. 12225 WORLD TRADE DRIVE, SUITE P SAN DIEGO, CALIFORNIA 92128 PHONE: (858) 485-5530 DATE: J.N.: DWG BY: SCALE: See above COSTA MESA MURRIETA PALM DESERT SAN DIEGO SANTA CLARITA
Transcript of PT-2 - gmw.consrv.ca.govgmw.consrv.ca.gov/.../APSI_003358_20070126_Plate5_PT2_to_PT3.p… ·...
PT-2
PT-2 (cont.) PT-3
PT-3 (cont.)
15013010 30 50 70 14012020 40 60 80 100 11090Sta 0(in feet)
160 180 200150 170 190 7090 80100140 120 110130
50 30 1060 40 2070 0
A B C D E F H IG J K L MN O
Sand bedSilty sand bedshaded where moist. Clay bed
FAULT A: N44W/80SWThickening and thinning ofunits - strike-slip offset,minor fault. (<1-2' rightlateral offset).
FAULT B: N40W/85SW(Same as fault A).
FAULT C: N36W/68SWNormal fault, approximately4" of apparent offset.
FAULT: N31W/87SWThickening - thinningof units. Strike-slipoffset, minor fault.(<1-2' right lateraloffset).
Sand bedwith shells.
Sand bedwith shellsand orangishred oxidation.
FAULT D: N40W/85SWNormal fault, approximately3" of apparent offset.FAULT E: N32W/71NE(Same as fault A).
Bench
Bench
X
Dark mineral laminar bedding, shells in very fine-grained sand unit contains detritalcharcoal roots, occasional scattered iron oxidation staining in root-like patterns.
Pale yellow (5Y 7/3)to white. FAULT F: N30W/80NE
Normal fault, approximately2" of apparent offset.FAULT G: N40W/60NENormal fault, approximately3" of apparent offset.FAULT H: N30W/64NENormal fault, approximately2" of apparent offset.
FAULT I: N30W/75NENormal fault, approximately1" apparent displacement.FAULT K: N35W/80SWNormal fault, approximately1" apparent offset.
Strongly grussified dioriticclast; crumbles in hand.
FAULT L: N35W/65-70NENormal fault, approximately1" apparent offset.
FAULT M: N35W/60-70NENormal fault, approximately1" apparent offset.
Z likeStrongly grussifieddioritic clast.
FAULT N: N40W/Near VerticalNormal fault, approximately1/2" apparent offset.
FAULT O: N30W/70-80NENormal fault, approximately1/2" apparent offset.
White - light buffclay layer, possibleash - reworkeddeposit.
Ungrussifieddioritic clast.
Top of trench.Secondary seismic pipewith + graded sand.Top of trench.Sand boil
X : Silty sand (SM); medium dense,gray (10YR 5/1), very fine - fine,abundant biotite.
Y : Silty sand (SM); medium dense,light brownish gray (10YR 6/2) dry,fine to medium, moderate crossbedding and channeling, fines upwards.
Z : Silty sand (SM); medium dense,light brownish gray (10YR 6/2) dry,fine to medium, moderate crossbedding and channeling, fines upwards.
Silty sand (SM); medium dense, grayishbrown (10YR 5/2) moist, very fine to fine.
3-6" thick pale yellow (5Y 7/3)clayed silty + ash marker bed,+ internally sheared.
Sandy silt (ML); white to brown, drymassive, partially (weakly) cemented.(Locally contorted by liquefaction).
Sand, light brown, dry, fine to coarse,massive, locally poorly stratified.
Sand, locally iron oxide stained, dry,fine to medium, massive, locallywarped by liquefaction.
NW WallN61E
Sand, reddened, iron oxide stained,massive, dry, medium to coarse,locally contorted by liquefaction.
Ground surface
Reddened iron oxidizedsand, fine to coarse.
Silt
White silt
White siltBrown silt
Silty sand
Sandy silt, brown, damp.
Water levelSubmerged
Trench floorFine sand
Silty sand
White ash/silt
Brownsilt
Trench widened,caving.
Liquefactionoffset AD 43 .
Sand, dark olive browndamp to wet, massive, saltcrystal precipitate on exposedsurfaces.
Slough
SE corner of existing house.
Highly weathereddioritic clast.
Strongly ironoxidized sand.Finely
stratifiedsand.
Gravelly sand, fine to very coarse,pale brown, dry, firm, stratified tomassive, slightly weathered graniticclasts, highly weathered dioriticclasts. Capped by iron oxidized sand.
FAULT: N57W/57NE1/2" apparent vertical offset, east side up.
FAULT: N50W/68NE1 1/4" apparent vertical offset, east side up.
FAULT: N51W/65NE1" apparent vertical offset, east side up.
FAULT: N53W/75NE1/2" apparent vertical offset, east side up.
FAULT: N58W/73NE1 to 2" apparent vertical offset, east side up.
FAULT: N58W/73NE2" apparent vertical offset, east side down.
FAULT: N36W/70NE2 to 3" apparent vertical offset, east side up.
FAULT: N68W/76NE5 1/4" apparent vertical offset, east side down.
FAULT: N52W/69NE2 to 3 1/4" apparent vertical offset, east side down.
FAULT: N45W/70NEApparent dip 50NE.
FAULT: N57W/58NE1" apparent vertical offset, east side down.
FAULT: N23W/88NE2.5 to 3.5" apparent vertical offset,east side down.
FAULT: N41W/71NE2" apparent vertical offset,east side down.
FAULT: N40W/72NE8.5 to 12" apparentvertical offset,east side down.
Sand, palegray, stratified.
Groundsurface
Alluvium, stratified,fine to medium sand,pale green.
Light olivesilty fine sand.Plastic
fragment
StyrofoamfragmentOrange
sand
Tension fracture
Sand boil planeN35W across trench.
Apparent vertical offset2.5", white.
Reddened sand, apparentvertical offset 2".Sand lense with shells.
Thin peat, 1" apparentvertical offset.
Liquefaction offsetN20W/40SW
Submerged Sandy silt White clayeysilt with ash. Cross-bedded
sand.
Silty sand/sandy silt,brownish gray, dry,massive, partiallycemented.
FAULT: N32W/84SW4.5" apparent vertical offset,east side down.FAULT: N56W/63NE2 to 2.5" apparent vertical offset,east side down.
FAULT: N43W/72NE2" apparent vertical offset,east side up.
Moist silty sand.
Silty sandEast downEast up Strike-slip
N58E
ZZ
0 10
GRAPHIC SCALE(in feet)
HORIZONTAL = VERTICAL
LAW
Trench Logs: PT-2 to PT-3
Jan. 2007 389-06
The Villas
PLATE 5
PETRA GEOTECHNICAL, INC.12225 WORLD TRADE DRIVE, SUITE P
SAN DIEGO, CALIFORNIA 92128PHONE: (858) 485-5530
DATE: J.N.:
DWG BY: SCALE: See above
COSTA MESA MURRIETA PALM DESERT SAN DIEGO SANTA CLARITA
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