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Edward Hill
5 years ago
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14 Photo 1 - Southerly view across 2700 parking lot toward existing building. Multi-residential building borders western side of property in upper right of view.

15 Photo 2 - Southerly view across 2750 parking lot toward existing building.

16 Photo 3 - Northerly view across vacant 2790 (former Texaco service station) toward building on southern side of 2750.

17 S. EL CAMINO REAL SITE N ft. Scale San Mateo County Topographic Map 8F & 9F (1/1/96) Earth Investigations Consultants Job No. Date /5/13 VICINITY MAP S. El Camino Real San Mateo, California Plate 1

S. EL CAMINO REAL A B-1 B-3 UNDOCUMENTED FILL EXPLANATION 27TH AVENUE B-2 Former Building Location Former Tank Location B-4 A 28TH AVENUE B-1 A A Approximate limits of undocumented fill placed during

18 S. EL CAMINO REAL A B-1 B-3 UNDOCUMENTED FILL EXPLANATION 27TH AVENUE B-2 Former Building Location Former Tank Location B-4 A 28TH AVENUE B-1 A A Approximate limits of undocumented fill placed during tank removal and site clean-up Approximate boring location Line of cross section A-A SITE AERIAL VIEW S. El Camino Real A Existing A Building 2750 S. El Camino Real Existing Building 2790 S. El Camino Real Former Service Station 80 N Relative Elevation (ft.) 40 B-1 B-2 B-3 B-4 TD=21 ½ TD=21 ½ TD=21 ½ TD=21 ½ ALLUVIUM (Intercalated Gravel, Sand, Silt and Clay)??? UNDOCUMENTED? FILL??? 40 0 ~40 ft. Scale 1) Aerial view from Google Earth (2011) 2) Site profile inferred from site observations 0 N 38 W Approximate Scale 1 = 40 0 GENERALIZED CROSS SECTION A-A Earth Investigations Consultants Job No. Approved Date SITE AERIAL VIEW & GENERALIZED CROSS SECTION A-A 9/5/ S. El Camino Real San Mateo, California Plate 2

SITE EXPLANATION Qf Qaf Qam Qac Qoa Qsr Qm Qyl Qol Tme Artificial fill Fine-grained alluvium Medium-grained alluvium Coarse-grained alluvium Older alluvium Slope wash, ravine fill and colluvium Bay

19 SITE EXPLANATION Qf Qaf Qam Qac Qoa Qsr Qm Qyl Qol Tme Artificial fill Fine-grained alluvium Medium-grained alluvium Coarse-grained alluvium Older alluvium Slope wash, ravine fill and colluvium Bay mud Younger landslide deposits Older landslide deposits Merced formation -200?? Geologic contact - dotted where concealed queried where existence or position is uncertain Fault - dashed where inferred; dotted where concealed; queried where existence or extension is uncertain Borehole to basement - showing elevation of top of basement (Franciscan Complex). Datum is mean sea level Franciscan Complex fs fc fsr Sandstone Chert Sheared Rock N ft. Scale Map from Pampeyan, 1994 Earth Investigations Job No GEOLOGIC MAP Plate S. El Camino Real Consultants Date 9/5/13 San Mateo, California 3

20 Pocket Pen (tsf) Torvan (tsf) Dry Density (pcf) Moisture Content (%) Blows/Foot (SPT) Sample Blows/Foot (SPT) 0 50 USCS Equipment Elevation BORING 1 Truck Mounted Flight Auger ~20 Date 7/19/2013 ~5 Asphalt concrete and 4 baserock Dark greyish brown and dark grey, Sandy CLAY with Gravel, damp, stiff (ALLUVIUM) 5 color changes to yellowish brown and grey at 4 becomes very stiff CL Depth (ft.) Yellowish brown Gravelly, Sandy CLAY/Clayey SAND, damp. very stiff/dense (ALLUVIUM) CL SC 20 >4.5 > Terminated at 21 ½ 25 EXPLANATION Elevation from Plate 1 - Vicinity Map Earth Investigations Consultants Job No. Date /5/13 LOG OF BORING S. El Camino Real San Mateo, California Plate 4

21 Pocket Pen (tsf) Torvan (tsf) Dry Density (pcf) Moisture Content (%) Blows/Foot (SPT) 2.5 > Sample Blows/Foot (SPT) 0 50 USCS CL ML Equipment Elevation BORING 2 Truck Mounted Flight Auger ~20 Date 7/19/ Asphalt concrete and 4 baserock Dark greyish brown,sandy CLAY with Gravel, damp, firm (ALLUVIUM) Yellowish brown and dark yellowish brown, Sandy Gravelly CLAY/Clayey GRAVEL, damp, very stiff/ medium dense to dense (ALLUVIUM) seepage at > Depth (ft.) 10 CL GP 15 Yellowish brown and brown, Sandy CLAY, damp, stiff (ALLUVIUM) CL 20 color changes to dark yellowish brown Terminated at 21 ½ 25 EXPLANATION Elevation from Plate 1 - Vicinity Map Earth Investigations Consultants Job No. Date /5/13 LOG OF BORING S. El Camino Real San Mateo, California Plate 5

22 Pocket Pen (tsf) Torvan (tsf) Dry Density (pcf) Moisture Content (%) Blows/Foot (SPT) Sample Blows/Foot (SPT) 0 50 USCS Equipment Elevation BORING 3 Truck Mounted Flight Auger ~20 Date 7/19/2013 Dark yellowish brown, Sandy CLAY with Gravel, damp, stiff (FILL) > CL > Depth (ft.) 10 SC Greyish brown, Gravelly Clayey SAND, wet, medium dense (FILL?) Yellowish brown, Sandy CLAY/Clayey SAND, wet, stiff/medium dense (ALLUVIUM) CL SC 20 CL Yellowish brown, Gravelly, Sandy CLAY, very damp, hard (ALLUVIUM) Terminated at 21 ½ 25 EXPLANATION Elevation from Plate 1 - Vicinity Map Ground water elevation after drilling Earth Investigations Consultants Job No. Date /5/13 LOG OF BORING S. El Camino Real San Mateo, California Plate 6

23 Pocket Pen (tsf) Torvan (tsf) Dry Density (pcf) Moisture Content (%) Blows/Foot (SPT) Sample Blows/Foot (SPT) 0 50 USCS SM Equipment Elevation BORING 4 Truck Mounted Flight Auger ~20 Date 7/19/2013 Dark brown, Gravelly Silty SAND, moist, medium dense (FILL) 5 Greyish brown, Clayey Silty SAND with Gravel, damp, medium dense (FILL?) SM 12 Depth (ft.) 10 saturated, No Recovery Yellowish brown, Gravelly SAND, saturated, dense (ALLUVIUM) 39/9 15 SP No Recovery 20 CL Yellowish brown, Gravelly Sandy CLAY, damp, very stiff (ALLUVIUM) Terminated at 21 ½ 25 EXPLANATION Elevation from Plate 1 - Vicinity Map Ground water elevation after drilling Earth Investigations Consultants Job No. Date /5/13 LOG OF BORING S. El Camino Real San Mateo, California Plate 7

24 COARSE GRAINED SOILS FINE GRAINED SOILS MORE THAN HALF OF MATERIAL IS LARGER THAN NO. 200 SIEVE SIZE MORE THAN HALF OF MATERIAL IS SMALLER THAN NO. 200 SIEVE SIZE GROUP Primary Divisions SYMBOL Secondary Divisions GRAVELS CLEAN Well graded gravels, gravel-sand mixtures, little or no fines. GRAVELS GW Poorly graded gravels or gravel-sand mixtures, little or no fines. MORE THAN HALF (LESS THAN 5% FINES) GP OF COARSE GRAVEL Silty gravels, gravel-sand-silt mixtures, non-plastic fines. FRACTION IS WITH GM LARGER THAN FINES Clayey gravels, gravel-sand-clay mixtures, plastic fines. NO. 4 SIEVE GC SANDS CLEAN Well graded sands, gravelly sands, little or no fines. SANDS SW Poorly graded sands or gravelly sands, little or no fines. MORE THAN HALF (LESS THAN 5% FINES) SP OF COARSE SANDS Silty sands, sand-silt mixtures, non-plastic fines. FRACTION IS WITH SM SMALLER THAN FINES Clayey sands, sand-clay mixtures, plastic fines. NO. 4 SIEVE SC Inorganic silts and very fine sands, rock flour, silty or clayey fine SILTS AND CLAYS ML sands or clayey silts with slight plasticity. LIQUID LIMIT IS LESS THAN 50% CL OL Inorganic clays of low to medium plasticity, gravelly clays, sandy clays, silty clays, lean clays. Orangic silts and organic silty clays of low plasticity. Inorganic silts, micaceous or diatomaceous fine sandy or silty SILTS AND CLAYS MH soils, elastic. LIQUID LIMIT IS GREATER THAN 50% CH OH Pt Inorganic clays of high plasticity, fat clays. Organic clays of medium to high plasticity, organic silts. Peat and other highly organic soils. HIGHLY ORGANIC SOILS Definition of Terms U.S. Standard Series Sieve Clear Square Sieve Openings /4" 3" 12" SILTS AND CLAY SAND GRAVEL FINE MEDIUM COARSE FINE COARSE Grain Sizes COBBLES BOULDERS SAND AND GRAVELS BLOWS/FOOT* SILTS AND CLAYS STRENGTH ** BLOWS/FOOT* VERY LOOSE LOOSE MEDIUM DENSE DENSE VERY DENSE OVER 50 VERY SOFT SOFT FIRM STIFF VERY STIFF HARD 0-1/4 1/4-1/2 1/ OVER OVER 32 Relative Density Consistency * Number of blows of 140 pound hammer falling 30 inches to drive a split spoon, SPT sampler (ASTM D-1586) ** Unconfined compressive strength in tons/sq. ft. as determined by laboratory testing or approximated by the standard penetration test (ASTM D-1586), pocket penetrometer, torvane, or visual observation.. Sample location; blow counts listed are from the bottom 12 inches of 18- inch drive sample. Unified Soil Classification System (ASTM D-2487) Earth Investigations Consultants Job No. Date /5/13 KEY TO BORINGS S. El Camino Real San Mateo, California Plate 8

25 60 50 PLASTICITY INDEX (%) CL CH A LINE MH or OH CL-ML ML or OL ML LIQUID LIMIT (%) KEY SYMBOL BORING NO. SAMPLE DEPTH (feet) NATURAL WATER CONTENT (%) LIQUID LIMIT (%) PLASTICITY INDEX (%) PASSING NO. 200 SIEVE (%) LIQUIDITY INDEX USCS B CL B CL-ML Earth Investigations Consultants Job No. Date /5/13 PLASTICITY CHART S. El Camino Real San Mateo, California Plate 9

Depth (ft) USCS Soil Description TOPSOIL & FOREST DUFF

Test Pit No. TP-6 Location: Latitude 47.543003, Longitude -121.980441 Approximate Ground Surface Elevation: 1,132 feet Depth (ft) USCS Soil Description 0 1.5 1.5 5.0 SM 5.0 8.0 SM Loose to medium dense,