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,V " _ s"� �� F`�`•�..T �." �'�3u�!+ �ra^i '� -•�~�wM��nt. _ _u, SrF' .T.4, " �, a�'�4'r i .- .. - ..� ,, 'o"_` � _ s. _ ,„a� 1'r'y�!'�' s ^, �''"..a='t�Pi.' ,+a,•r- �ry�_ r�` +. t==1•P ,�_ -•py, � nr.� .. x., .,p_,.a"�.`��.�,•j- ,��,,. � .7k ,u5 'S�''-`i �'�a s �'^.',t. '�x'",tee* 1-' •�-:x'�` =:1' �r�`!,:4°. �4' ;;. "�^�f� ,�+'• �'r �wy`•. 4 .Y; r ��.x -"6 a i•„J_� -we- Ct i i" I 2.2 Soll Boring and Soil Sum lin Pmtncul Soil boring and soil sampling were performed under the direction of a Delta engineer or geologist. The soil boring was advanced using a truck-mounted hollow-stem auger drill rig. All downhole drilling equipment was steam-cleaned before and after drilling. To reduce cross contamination between samples,the split-barrel sampler was washed in a soap solution and double-rinsed between each sampling event. • r f Soil sampling was done in accordance with ASTM 1586-84. Using this procedure,a 2-inch outside diameter E split-barrel sampler or a 2-inch inside diameter California-type sampler is driven into the soil every 5 vertical Feet b a 140 { y pound weight failing 30 inches. The number of blow counts required to advance the sampler I 18 inches was recorded on the soil boring log at each sample interim. , Upon recovery,a portion of the soil sample was placed in a plastic bag and sealed for Inter screening with } t. a photoionization detector (PID). Another portion of the sot[ satr,alc was used For classification and description. That part of the suit sample collected in brass tubes within the California-type sampler was I stored at approximately 4°C for transport to the laboratory. After soil samples placed in plastic bags were brought to ambiens temperature,the headspsce vapors of the soil sample bags were screened with a PID equipped with a 10.2 eV lamp calibrated to benzene. The sample bag was opened and the detector probe immediately placed within the headspace of the bag. The highest ` observed reaLsng was then recorded. 2.3 nSnnitnring V101 Develo men Nr_aln and Sam lin Monitoring wall MW-10 as developed by removing a m:aimum of six well volumes with a bailer. Prior to sampling,the well was parged until there was relative stabilization of the pH, temperature,and OL'."trical conductivity of the gmund water. Following relative.,Aabilization of the pH, temperature,and electrical conductivity of the water,a sample was removed by use of a Teflon bailer. Sample storage and transport procedures are described in Section 1.3, I 2.4 Surveying The well riser elevation was sumeycd to within one-hundredth of a foot (0,01 foot),relative to the top of the casing of monitoring well MW-4, which was previously surveyed to a temporary benchmark with an arbitrarily designated elevation. QMR90I JDM I r aa�mi