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<br />TFrIx-WALLED TUBE SAMPLIM, OF SOILS (D 1587)
<br />•.^.it s. Tie inside clearance ,';,?:�> snail
<br />between 0.5 and 3 Der cent.
<br />vent ho _= ,; ;n. 1.�.i :nn
<br />rr:i�iriu,:,l shall -be provided in the san
<br />pler head.. coupling head with a the
<br />valve and a minimum of 0.6 in.= (3.9 cm
<br />venting to outside above check val,
<br />shall be used. Table 1 shows the dime
<br />sions of suitable thin -walled sampl
<br />tubes.
<br />2.3 Scaling Iirax--Any wax shall b
<br />Permitted, for sealing that does not ha
<br />appreciable shrinkage, or does not pe
<br />mit evaporation from the sample. Micro
<br />crystalline waxes are preferable to par
<br />afnn. Thin disks of steel or brass tha
<br />are slightly smaller than the inside diarn
<br />eter of the tube are desirable for Plugging
<br />both ends before sealing With wax
<br />Cheesecloth and tape are needed. Suita-
<br />ble expanding packers may be used.
<br />2.4 .4 ctessory Equipment - Labels,
<br />data sheets, shipping containers, and
<br />other necessary supplies.
<br />3. Procedure
<br />3.1 Clean out the hole to sampling
<br />elevation using whatever method is pre-
<br />ferred that will ensure that the material
<br />to be sampled is not disturbed. In satu.
<br />rated sands and silts withdraw the drill
<br />bit slo%uly to prevent loosening of the soil
<br />around the hole. Maintain the water
<br />level in the hole at or above ground water
<br />level.
<br />3•2 The use of bottom discharge bits
<br />shall not be allowed but, any side dis.
<br />charge bit is permitted. The procedure
<br />of jetting through an open -tube sampler
<br />to clean out the hole shall not be allowed.
<br />3.3 With the sampling tube resting on
<br />oe :' c bottom. o;'he hug. Zn,3
<br />'the borir., a: :he i_round
<br />or abov; . pi sh, :he :::br in:u :It: .
<br />• a1- continuous and rapid motion, +�•ithout
<br />cl; impact or twistin;. In no case shall the
<br />=) tube be pushed further than the length
<br />�e provided for the soil sample. Allow about
<br />n. 3 in. (75 mm) in the tube for cuttings
<br />e and sludge.
<br />3.4 When the soils are so hard that a
<br />e pushing motion will not penetrate the
<br />ve sampler sufficiently for recovery, and
<br />r. where recovery by pushing in sands is
<br />. poor, use a driving hammer to drive the
<br />- sampler. In such a case, record the
<br />t weight, height, and number of blows.
<br />Before pulling the tube turn it at least
<br />g two revolutions to shear the sample off
<br />at the bottom.
<br />3.5 Repeat the sampling procedures
<br />described at intervals not longer than 5
<br />ft (1.5 m) in homogeneous strata and at
<br />every change of strata.
<br />4. Preparation for Shipment
<br />4.1 Upon removal of the sampler tube,
<br />measure the length of sample in the tube
<br />and also the length penetrated. Remove
<br />disturbed material in the upper end of
<br />the tube before applying wax and meas.
<br />ure the length of sample again. After re.
<br />moving at least 1 in. (25 mm) of soil from
<br />the lower end, and after inserting an im.
<br />pervious disk, and
<br />both ends of the tube
<br />with wax applied in a way that will pre-
<br />vent wax from entering the sample
<br />Where tubes are to be shipped some dis-
<br />tance, tape the ends to prevent breakage
<br />of the seals. It is advisable to place
<br />cheesecloth around the ends after sealing
<br />and dip the ends several times in the
<br />melted wax.
<br />'.' Ai:ix labe:., t : the :,.:b:s
<br />number. sample nunnber, 6epta. pene.
<br />tration, and recovery length. Record a
<br />careful description of the soil, notin;
<br />composition, structure, eonsiste:Ie}•,
<br />color, and degree of moisture. dark the
<br />tube and boring numbers in duplicate.
<br />4.3 Do not allow tubes to freeze, al..;
<br />store in a cool place out of the sun at z11
<br />times. Ship samples protected %rith suit.s-
<br />ble resilient packing material to'reduc'e
<br />shock, vibration, and disturbance.
<br />4.4 Lasing soil removed from the ends
<br />of the tube, make a careful description
<br />giving composition, condition, color and,
<br />if possible, structure and consisterL:
<br />S. Report
<br />5-1 Data obtained in borings shall be
<br />recorded in the field and shall include ;,i:.
<br />following:
<br />5.1.1 Name and Iocation of job,,
<br />5.1.2 Date of boring --start, nniA,
<br />5.1.3 Boring number and coordinate..
<br />if available,
<br />5.1.4 Surface elevation, if available,
<br />S.1.5 Sample number and depth,
<br />5.1.6 Method of advancing sampler,
<br />Penetration and recovery lengths,
<br />5.1.7 Type and size of sampler,
<br />5.1.8 Description of soil,
<br />5.1.9 Thickness of laver,
<br />5.1.10 Depth to «ater s� ;ace; to I_s3
<br />of water; to artesian head; tirne at which
<br />reading was made,
<br />S.1.11 Type and Crake of machine,
<br />5.1.12 Size of casing, depth of cased
<br />hole,
<br />5.I.13 Names of crewmen, and
<br />5.1.14 Weather, remarks.
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