TP-1 N61E 0 DARK BROWN SANDY SILT (ML) stiff, wet with roots (Disturbed Surficial Soil) DEPTH (FEET) 5 REDDISH BROWN SANDSTONE intensely fractured, weak to friable, deeply weathered, tight (Franciscan Assemblage) 10 15 20 TP-2 DEPTH (FEET) 0 5 10 GRAYISH BROWN AND GRAY MELANGE, friable to plastic, crushed, deeply weathered, mainly decomposed to clay, stiff, wet, with roots (Landslide Debris) 1/2 layer of gray clay, stiff, wet with polished parting, subhorizontal (Landslide Plane) N61E GRAYISH BROWN AND GRAY MELANGE, friable to plastic, crushed, deeply weathered (Franciscan Assemblage) DARK BROWN SANDY SILT (ML) stiff, wet with roots (Disturbed Surficial Soil) RED AND GRAY MELANGE consisting of plastic shale with fragments of sandstone, pervasively sheared (Franciscan Assemblage) Shear zone - 4 thick zone of reddish brown clay with polished parting @N52E32NW 15 0 5 SCALE IN FEET 20 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Logs of Test Pits TP-1 and TP-2 Portola Middle School El Cerrito, California

TP-3 0 DARK BROWN SANDY SILT (ML) stiff, wet, with roots (Disturbed Surficial Soil) N61E 1 seam of olive gray clay with polished parting, subhorizontal (Landslide Plane) DEPTH (FEET) 5 10 DARK BROWN SANDY SILT (ML) stiff, wet with roots (Disturbed Surficial Soil) Curb Play Ground RED AND GRAY MELANGE, consisting of plastic shale with fragments of sandstone, pervasively sheared (Landslide Debris) 15 Landslide plane @ N30W10SW with striations @N61ES61W OLIVE BROWN AND REDDISH BROWN GRAVELLY SILTY CLAY (CL) very stiff, wet (Landslide Debris) GRAYISH BROWN AND GRAY MELANGE, friable to plastic, crushed, deeply weathered (Franciscan Assemblage) 20 TP-4 N61E 0 OLIVE BROWN AND REDDISH BROWN GRAVELLY SILTY CLAY (CL) very stiff, wet (Landslide Debris) DEPTH (FEET) 5 GRAY SANDY SILT (ML) very stiff, wet, with occasional vertical fissures (Paleosol) Curb Play Ground 10 4 thick zone of olive gray clay with polished parting, very stiff, wet (Landslide Plane) YELLOWISH BROWN SANDSTONE, closely to intensely fractured, friable, deeply to severly weathered, tight (Franciscan Assemblage) 15 0 5 SCALE IN FEET 20 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Logs of Test Pits TP-3 and TP-4 Portola Middle School El Cerrito, California

Log of Boring LD-1 Depth Feet Graphic Log (In cut area - surficial soil removed by cut) Portola Middle Project Name School Job Number Drilling Method 24 Bucket Auger Description Location El Cerrito, CA Date Completed 02/23/05 Depth 53 ft. Elevation 219 ft 5 REDDISH BROWN GRAVELLY CLAY (CH), very stiff to hard, moist, with rare roots; gravels are angular Franciscan rock fragments (Landslide Debris) Slight seepage Slight seepage 10 Becomes saturated with moderate seepage, locally grades to clayey gravel 15 Becomes stiff to very stiff, gravel is greater than 50% 20 Contact wavy @ approximately N10E35E with gray clay seam (Landslide plane) MIXED DARK BROWN GRAVELLY CLAY AND LIGHT YELLOWISH BROWN GRAVELLY CLAY AND YELLOWISH BROWN SILTY CLAY (CL), very stiff, wet, with angular rock fragments (Landslide Debris) Includes semi-intact rock masses of YELLOWISH BROWN SILTY SANDSTONE, closely fractured 25 Grades to mainly DARK BROWN SANDY SILT(ML) hard, moist, with rock fragments; with intermixed YELLOWISH BROWN SANDY SILT AND CLAY (ML-CL) chaotic texture (Landslide Debris) 30 35 Contact @ N15W38NE sharp, (Landslide plane) with polished parting YELLOWISH BROWN CLAYEY SILT, hard, moist, tight, 1/2 thick clay seam and polished parting @ N63W25SW (Landslide Plane) LIGHT TO DARK GRAYISH BROWN GRAVELLY CLAY (CL), very stiff, wet, with angular gravels (Landslide Debris) Locally grades to GRAY GRAVELLY SILTY CLAY, very stiff, wet Zone of rock. SILICOUS YELLOWISH BROWN SANDSTONE. Very hard, appears disturbed, disarticulated (Landslide Debris) With steeply dipping shears With disarticulated rock zones Gradational Contact DARK BROWNISH GRAY GRAVELLY CLAY (CL) very stiff, wet, with angular gravels (Landslide Debris) 40 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Log of Boring LD-1 Portola Middle School El Cerrito, California

Log of Boring LD-1 Depth Feet Graphic Log Portola Middle Project Name School Job Number Drilling Method 24 Bucket Auger Description DARK BROWNISH GRAY GRAVELLY CLAY (as above) Location El Cerrito, CA Date Completed 02/03/05 Depth 53 ft. Elevation 219 ft 45 50 Becomes stiff, saturated Contact: Slide Plane, dark gray clay (CH), 1 thick, stiff, wet @N70E18NW, with polished partings, BROWN AND GRAY GRAVELLY CLAY (CH) very stiff, wet (Landslide Debris) Contact: Slide Plane, light gray clay seam, 1 thick, with polished partings @ N10E10W DARK BROWN CLAYEY SILT WITH SAND (ML) stiff, moist to wet, with high organic content, with deeply weathered sandstone fragments (Paleosol) No seepage below 45.5 feet. Contact, gradational, subhorizontal LIGHT GRAY SILTY SAND (SM) very dense, wet (deeply weathered sandstone) LIGHT GRAY SANDSTONE, closely fractured, weak, little weathered (Franciscan Assemblage) Very hard drilling Bottom of Hole at 53 Feet Logged to 51.5 feet 55 Water level at 51.5 feet after logging Backfilled with cuttings, tamped with drill rig 60 Seepage observed intermittently from 3 feet to 45.5 feet, no seepage below 45.5 feet 65 70 75 80 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Log of Boring LD-1 Portola Middle School El Cerrito, California

Log of Boring LD-2 Depth Feet Graphic Log Portola Middle Project Name School Job Number Drilling Method 24 Bucket Auger Description Location El Cerrito, CA Date Completed 02/24/05 Depth 21 ft. Elevation 219 ft 2 inches Base Rock, 2 inches AC GRAY AND YELLOWISH BROWN CLAYEY SANDY GRAVEL (GS) very dense, wet with rare roots. Gravels are angular rock fragments (Fill - well compacted) YELLOWISH BROWN SANDSTONE, moderately fractured, moderately strong, tight, articulated, moist, with rare gray clay in fractures, becomes moderately weathered below 2.6 feet, deeply weathered from 1.6 feet to 2.8 feet @ 1.6 feet contact sub-horizontal, sharp 5 10 Becomes brown with water in fractures, slight seepage, very tight, with local friable zones 15 20 Bottom of boring at 21 feet Logged to 19.5 feet, water level at 19.5 feet, continuous slight seepage below 10 feet Backfilled with cuttings, tamped by drill rig 25 30 35 40 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Log of Boring LD-2 Portola Middle School El Cerrito, California

Log of Boring LD-3 Unconfined Compressive Strength psf Blows / 12-inches* Dry Density pcf Moisture Content % Inches Driven Liquid Limit Plasicity Index % Passing #200 Sieve Depth Feet Graphic Log Portola Middle Project Name School Job Number 2392-4 Drilling Method 24 Bucket Auger Description Location El Cerrito, CA Date Completed 02/27/05 Depth 53.5 ft. Elevation 168 219 Feet ft DARK BROWN SILTY CLAY (CH), very stiff, wet, with roots and rock fragments (Landslide Debris) 5 10 Contact, gradational, gently west dipping BROWN SILTY CLAY AND CLAYEY SILT (CL-ML), very stiff, wet, with roots and rock fragments (Landslide Debris) 15 20 25 Series of discontinuous shears dipping west at 25 degrees and north at approximately 30 degrees with faint polished partings Contact very irregular, dipping steeply northeast with faint polished parting REDDISH BROWN GRAVELY SAND WITH SILTY CLAY (SC-CL) very dense, or very stiff, moist, chaotic (Landslide Debris) Contact dips approixmately 5 degrees west, irregular 4 zone of discontinuous lenses of white silty clay and yellowish clay, no visible shearing Zone of intermixed silty clay and white calcareous clay, very stiff to hard, in discontinuous lenses Shear Fabric N02W21E BROWN TO OLIVE BROWN CLAYEY SILT (ML) very stiff to hard, moist, with reddish siltstone fragments (Landslide Debris) OLIVE GRAY GRAVELLY CLAYEY SILT (ML) very stiff, wet; gravels are chiefly wavy gradational contact, angular sandstone fragments DARK OLIVE GRAY CLAYEY SILT WITH GRAVEL, very stiff, wet (Landslide Debris) Contact sharp with 2 thick seam of gray gravelly clay, no obvious shearing @N45W5SW OLIVE BROWN CLAYEY SILT WITH SAND AND GRAVEL (ML) very stiff to hard, wet to moist with patches of white carbonate, chaotic texture (Landslide Debris) 30 35 Grades to cheifly YELLOWISH BROWN SILTY SAND WITH CLAY AND GRAVEL 40 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Includes zones of sandy silt with gravel and zones consisting largely of angular sandstone fragments, chaotic Log of Boring LD-3 Portola Middle School El Cerrito, California

Log of Boring LD-3 Unconfined Compressive Strength psf Blows / 12-inches* Dry Density pcf Moisture Content % Inches Driven Liquid Limit Plasicity Index % Passing #200 Sieve Depth Feet Graphic Log Portola Middle Project Name School Job Number 2392-4 Drilling Method 24 Bucket Auger Description Location El Cerrito, CA Date Completed 02/27/05 Depth 53.5 ft. 219 ft Elevation 168 Feet OLIVE BROWN CLAYEY SILT with sand and gravel (as above) 45 YELLOWISH BROWN CLAYEY SILTY GRAVEL (GW) sandy gravels include well rounded pebbles and angular rock fragments, very dense, saturated with moderate seepage, chaotic texture (Landslide Debris) YELLOWISH BROWN SANDSTONE, closely fractured, weak, moderately weathered, tight (Franciscan Assemblage) Moderate seepage 50 Bottom of boring at 53.5 feet 55 Backfilled with cuttings, tamped by drill rig Water depth at time of logging 48 feet 60 65 70 75 80 ALAN KROPP & ASSOCIATES JOYCE ASSOCIATES Log of Boring LD-3 Portola Middle School El Cerrito, California