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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