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-�q..'i' .. �w. x��„ �• k '-� ati Y��i1.i� :tom •L,�_ '�� �f_ :'?... ��. `s*ne- <br /> -le <br /> 5 <br /> 2.2 Soft Boring and Sale SFIMPJ1nL,Protocol <br /> Soii boring and soil sampling were performed under the direction of a Delta engineer or geologist. The soil <br /> boring was advanced using a truck-mounted hollow-stem auger drill rig. <br /> All downhole drilling equipment was steam-cleaned before and after drilling. To reduce cross contamination <br /> beiween samples, the split barrel sampler was washed in a soap solution and double-rinsed between each <br /> sampling event. <br /> Soil sampling was done in accordance with ASTM 1585-84- Using this procedure,a 2-inch outside diameter <br /> split-barrel sampler or a 2-inch inside diameter California-type sampler is driven into the soil every 5 vertical <br /> fact by a 140-pound weight falling 30 inches. The number of blow counts re`.,Ared to advance the sampler <br /> 18 inches was recorded on the soil boring log at ea:h sample interim. <br /> Upon recovery,a portion of the soil sample was placed in a plastic bag and sealed for later screening with <br /> a photoionization detector (PID). Another portion of the soil sample was used Nr classification and <br /> description. That part of the suit sa*rple collected in brass tubes within the. California-type sampler was <br /> stored at approximately 4°C for transport to the laboratory. <br /> After soil samples placed in plas$i bags were brought to ambient temperature,the headspace vapors of the <br /> soil sample bags were screened with a PID equipped with a 10.2 eV lamp calibrated to benzene. The sample <br /> bag was opened acid the detector probe immediately placed within the headspace.of the bag. The highest <br /> observed reading was then recorded. <br /> 2,3 Monitoring Well nevelonmenL Purging.and Samnline <br /> Monitoring well MW-1G as developed by removing a minimum of six Weil volumes with a bailer. Prior to <br /> sampling,the well was purged until there was relative stabilization of the pH,temperature,and electrical <br /> conductivity of the ground water, Following relative stabilization of the pH, temperature, and electrical <br /> conductivity of the water,a sample was removed by use of a Teflon bailer. Sample storage and eransport <br /> procedures are described in Section 1.3. <br /> 2.4 Surveying <br /> The well riser elevation was surveyed to within one-hundredth of a foot (0.01 foot),relative to the top of <br /> t <br /> the casing of monitoring well MW-4, which was previously surveyed to a temporary benchmark with an <br /> arbitrarily designated elevation. <br /> QME2oot.1DM <br />