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Four Corner - Texas Water Development Board

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'<br />

KEY TO TERMS AND SYMBOLS USED ON BORING LOGS<br />

'<br />

SOIL SYMBOLS<br />

Soil !II!...<br />

~ illiii1 ffi@ill ~<br />

Clay Sill Sand Gravel<br />

ll:odl!leno<br />

~ D [] :-:t..<br />

Clayey Silly Sandy Cemented<br />

~<br />

. -<br />

Conalruction Material•<br />

.. .!..,.!<br />

~~;<br />

~ 11<br />

Alophaltic Stabilized Fill or PorUand<br />

Concrete Bue Deb ria Cemenl<br />

Concrete<br />

Thin 'lt'alled<br />

I Shelby Tube<br />

~<br />

Splil Barrel<br />

SAMPLER TYPES<br />

• • (] Liner Tube B<br />

-¥-<br />

~<br />

0<br />

No Recovery<br />

[) Aucer<br />

Jar Sample<br />

WATER LEVEL SYMBOLS<br />

Groundwater level determined<br />

drillinc operation•<br />

durinc<br />

Groundwater level alter drillinc in<br />

open borehole or piezometer<br />

(<br />

Cla .. ification<br />

Clay<br />

Sill<br />

Sand<br />

Gravel<br />

Cobble<br />

Boulder<br />

SOIL GRAIN SIZE<br />

Particle Size<br />

< 0.002 mm<br />

0.002 - 0.075 mm<br />

0.075 - 4. 75 mm<br />

4. 7:5 - 7:5 mm<br />

7:5 - 200 mm<br />

> 200 mm<br />

Particle Size or Sieve<br />

No. (U.S. Standard)<br />

< 0.002 mm<br />

0.002 mm - 1200 sieve<br />

#200 sieve - #4 sieve<br />

#4 oieve - 3 in.<br />

3in.-8in.<br />

> 8 in.<br />

DENSITY OF COHESIONLESS SOILS<br />

Very Looae<br />

Laoae<br />

Medium Denae<br />

Denae<br />

Very Denae<br />

Penetration<br />

Reaiatanc:e •N• •<br />

Blo,./Fool<br />

0 - 4<br />

4 - 10<br />

10 - 30<br />

30 - 50<br />

> 50<br />

CONSISTENCY OF COHESIVE SOILS<br />

Consistency<br />

Very So!l<br />

Sofl<br />

Firm<br />

Still<br />

Very surr<br />

Hard<br />

Undrained Shear<br />

Strencth (tar)<br />

0 - 0.125<br />

0.125 - 0.2:5<br />

0.25 - 0.5<br />

0.5 - 1.0<br />

1.0 - 2.0<br />

> 2.0<br />

3/8<br />

50/4"<br />

0/18"<br />

PENETRATION RESISTANCE<br />

Blowa required lo penetrate each of three consecutive 8-lnch increment.. per ASTII: D-1588 •<br />

ll more than 50 blowa are required, drivinc Ia discontinued and penetration al 50 blowa Ia noted<br />

Sampler penetrated lull depth under weichl of drill rodo and hammer<br />

• The N value Ia taken •• the blowa required lo penetrate the final 12 inchea<br />

Slicbn,ided<br />

Finurr!d<br />

lAyer<br />

TERMS DESCRIBING SOIL STRUCTURE<br />

Fracture planea appear polithed or<br />

clo .. y, oometimea olriated<br />

Break• alone de!lnile plane• of !raclure<br />

with lllUe rea;.tance lo !raclurinc<br />

Small pockela of dil!erenl ooils, auch<br />

&I lm&ll len1e1 a( 1and IC&tlered<br />

throuah a maaa at clay<br />

lncluoion leao than 1/• Inch thick<br />

exlendinc lhrouch the sample<br />

lncluaian 1/4 inch to 3 inches thick<br />

extendlnc throuch the sample<br />

lncluoion creater than 3 inches thick<br />

utendln1 throu1h the oample<br />

lAminated<br />

Stra tilled<br />

Intermixed<br />

Ferrous<br />

Nodule<br />

Soil sample c:ompoaed of alternatin&<br />

partincs ol different soil lype<br />

Soi.l aample c:ompoaed of allernaUnc<br />

aeama or layen of different soil type<br />

Soil sample composed of pockets of<br />

difterenl aoil type and laminated or<br />

alralitied otruclure Ia nol evidenl<br />

Havinc appreciable quantitiea oC calcium<br />

carbonate<br />

Havlnc appreciable quantities of iron<br />

A 1mall masa ot irre&ular ahape<br />

PLATE 13<br />

I

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