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