Laserfiche WebLink
<br />~ SHALE OR CLAYSTONE <br /> <br />~I SILTSTONE <br /> <br />D SANDSTONE <br /> <br />~:~ CONGLOMERATE <br /> <br />LA YERING <br /> <br />ROCK SYMBOLS <br />~>>~ CHERT <br /> <br />~ ~ PYROCLASTIC <br /> <br />[J VOLCANIC <br /> <br />~ PLUTONIC <br /> <br />~ SERPENTINITE <br /> <br />~~~~I~ METAMORPHIC ROCKS <br />:r.":T.T. <br /> <br />I I <br />I I I <br />I I <br />I I I <br /> <br />DIA TOMITE <br /> <br />~ SHEARED ROCKS <br /> <br />JOINT, FRACTURE, OR SHEAR SPACING <br /> <br />MASSIVE <br />THICKLY BEDDED <br />MEDIUM BEDDED <br />THINNL Y BEDDED <br />VERY THINNL Y BEDDED <br />CLOSELy LAMINATED <br />VERY CLOSELY LAMINATED <br /> <br />Greater than 6 feet <br />2 to 6 feet <br />8 to 24 inches <br />2.1/2 to 8 inches <br />3/4 to 2-' /2 inches <br />1/4 to 3/4 inches <br />Less than 1/4 inch <br /> <br />VERY WIDELY SPACED <br />WIDELY SPACED <br />MODERATELY SPACED <br />CLOSELY SPACED <br />VERY CLOSELY SPACED <br />EXTREMELY CLOSELY SPACED <br /> <br />Greater than 6 feet <br />2 to 6 feet <br />8 to 24 inches <br />2-' /2 to 8 inches <br />3/4 to 2-' /2 inches <br />Less than 3/4 inch <br /> <br />SOFT - Pliable; can be dug by hand <br /> <br />HARDNESS <br /> <br />FIRM - Can be gouged deeply or carved with a pocket knjfe <br /> <br />MODERATELY HARD - Can be readily scrached by a knife blade; scratch leaves heavy trace of dust and is readily visable <br />after the powder has been blown away <br /> <br />HARD - Can be scratchE1d with difficulty; scratch produces little powder and is often faintly visable <br /> <br />VERY HARD - Cannot be scratched with pocket knife; leaves a metallic streak <br /> <br />STRENGTH <br /> <br />PLASTIC - Capable of being molded by hand <br /> <br />FRIABLE - Crumbles by rubbing with fingers <br /> <br />WEAK - An unfractured specimen of such material will crumble under light hammer blows <br /> <br />MODERATELY STRONG. Specimen will withstand a few heavy hammer blows before breaking <br /> <br />STRONG - Specimem will withstand a few heavy ringing hammer blows and usually yields large fragments <br /> <br />VERY STRONG. Rock will resist heavy ringing hammer blows and will yield with difficulty only dust and small <br />flying fragments <br /> <br />DEGREE OF WEA THER/NG <br /> <br />HIGHLY WEATHERED - Abundant fractures coated with oxides, carbonates, sulphates, mud, etc., thourough discoloration, <br />rock disintegration, mineral decomposition <br /> <br />MODERATELY WEATHERED - Some fracture coating, moderate or localized discoloration, little to no effect on cementation, <br />slight mineral decomposition <br /> <br />SLIGHTLY WEATHERED - A few stained fractures, slight discoloration, little or no effect on cementation, no mineral <br />decomposition <br /> <br />FRESH. Unaffected by weathering agents, no appreciable change with depth <br /> <br /> Job No: 060805 ENGINEERING GEOLOGY PLATE <br />GEOTECNIA Appr: /fl. ROCK TERMS <br />Consulting Engineers Proposed New Residence at 12 <br /> Drwn: LPDO <br /> 2888 Darius Way <br /> Date: OCT 2006 San Leandro, California <br />