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_ a- moi �.w .�r�, a _" ?- _ �� �.: -w,- ..,.. __ r , '•* ;- _ �, <br /> r <br /> APPENDIX A <br /> FIELII PROCEDURES <br /> SITE INVESTIGATION PROCEDURES <br /> The Site investigation program consisted of exploratory drilling, <br /> soil sampling, observation well installation, field chemical analysis <br /> Of soil samples, and water sampling. The procedures are dascribed <br /> below. <br /> Epi ra o r i �ynp <br /> C_Lenairmq Proc,Adwrea <br /> All borings were drilled using clean eight-inch diameter hollow-stem <br /> auger or six-inch diameter continuous-flight auger drilling equipment <br /> and were lagged by z fRCIFiC gealogist using the Unified Soil <br /> Classification System and the Subsurface Investigation Activity Guide <br /> 3 (Exhibit El provided by Shell 011 Com an <br /> F in this RppJndix. Compan Boring Ings are included <br /> i <br /> Betwe9f, soil Samplingevents. the sampler _ <br /> rin5 . first <br /> r cle.n water, then Indetergent, andfiinallyaIntclrean water Betweenn <br /> # harings, the sampler received a fourth rinse with organic-free <br /> water. Also between borings, all augers were stebm cleaned. <br /> i <br /> F r1• <br /> l ` <br /> Sol I Sam lin <br /> 4 Soil samples for logging and laboratory analysis were collected <br /> whenever possible at a y <br /> pproximatel 5-foot depth intervals by <br /> advancing a California-Modified split-spoon sampler with clean brass <br /> liners into undisturbed soil beyond the tip of the auger. <br /> split-spoon sampler was driven a maximum of 18 inches using he <br /> hydraulic pressure instead of the usual 140-pound hammer. The hemmer <br /> was not used because heavy rains at the time of the field <br /> Investigation saturated the hammer rope and rendered it unsafe. <br /> After the sampler was withdrawn from the borehole, the amount of <br /> sample recovery was noted on tha logs, and the brass liners holding <br /> i the soil samples were removed. Up to two of these liners from each <br /> ! sample interval were wrapped in aluminum foil and chilled for <br /> Possible laboratory analysis. Samples selected for laboratory <br /> analysis were sealed in glass jars, labeled, logged onto <br /> chain-of-custody forms, and stored on ice for transport. Another <br /> 'i portion of the sample was retained for the field chemical analysis, <br /> described below. <br /> 1 <br /> - -- _, -- Uell Construct on / Ex locator Borin Abandonment --- <br /> i <br /> .; Borings S-i and S-2 .wera . advanced approximately 10 feet into the <br /> water-bearing zone, taking care not tofull <br /> aquitard. Y Penetrate a S-foot-thick <br /> I <br /> s 100-13.0E <br />