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Ilk KLEINFELDER <br /> U�li <br /> Task 2 - Geotechnical Services, _ Kleinfeldef will prepare'-a geotechnical ° engineering report; prior to initiation of'the <br /> 'excavation activities. The purpose of our study, will be to review the. resent site conditions <br /> i Ai< and evaluate 'existing site subsurface information -in order, to ;provide 'geotechnical t <br /> ' , fen meerm recommendations for r ]ect shoriyti and foundation support desi n:� <br /> The logs of soil ;borings drilled around the for mer,excavation by Kleinfelder in.19$9 will be`' <br /> `reviewed to evaluate subsurface conditions 16, vicinity of the structure..'.A Kleinfelder <br /> geotechnical engineer will visit the siteto obseive present site conditions prior to.initiating <br /> the excavation activities. "Results of our subsurface data review. and engineering analyses l <br /> T` .s, tt• '" will be summarized in a report containing at least the following: <br /> o . A description of the proposed project, <br /> ¢o„ A. description of the.,surface and, subsurface .site. conditions...encountered <br /> during our field investigation;; <br /> .o Recommendations for tempora dry excavations, shoring; and existing adjacent' <br /> foundation support. <br /> '-Task 3 - Additional Excavation and Sampling <br /> During removal o£the 1,000-gallon UST, soil was excavated to.a deptli.of 16 feet to collect' ~ l <br /> verification samples. ' Upon completion.of,the sampling, the excavation was backfilled to <br /> within b feet of the ground surface with clean soil. This clean soil will be.re-excavated and <br /> '. stockpiled separately from the affected soil'beneath it. .A qualified excavation contractor <br /> will use a track.mounted excavator'-to remove .the necessary soil. The soil affected with <br /> ry ` TPH beneath the former UST will be excavated to a maximuin depth.of 20 to 22 feet. <br /> a <br /> Two soil samples will be collected for analysis based on the sizeof the former tank that the ; <br /> Regional,Water.Quality Control Board (RWQCB)-specifics for Leaking Underground Fuel. <br /> ti f Tanks (LUFT).'. Due to the depth of the excavation, the two sail samples will;be collected <br /> t from the excavation bottom using the backhoe'bucket: 'During the.excavations operations,. <br /> ��. <br /> an;organic vapor detector will be used to' screen the samples ,in ;thee field. 'A flame-: <br /> r %ionization detector (FID) will be us 6d,to'rnea"sure total ionizable compounds in parts per <br /> million by volume (pp <br /> relative to'a.caliliration standard. The qualitative screening will <br /> 4"fit , "`assist in selecting samples to be submitted-for laboratory-analysis: and in assessing, the <br /> }< ,4 possible extent of petroleum hydrocarbon nugration I ', <br /> ;Upon completion of the excavation,;Kleinfelder will retain the services of a subcontractor <br /> to erect a temporary fence around the excavation <br /> Y F: t- <br /> �a Laboratory.Analysis <br /> L <br /> ,The two soil' samples collected' from'-the' ex cavation'bottoii,i will be submitted under <br /> 4 r f .+,,;chain-of-custody`to California Analytical Laboratories/ENSECO in West Sacramento to <br /> ­ ;provide a uantitative assessment'of organic compounds and metal;concentrations. Two <br /> samples wi�I be.subrm'tted for analysis on d'rusli laboratory schedule'requirin&.'3 to S days. <br /> �Ibu °uSelection'of the'sam les will be based on fie0observations; depth in'excavation, and FID <br /> .field screeningresults: ' Based on canversations`,with the SJCEIID and the RWQCB's <br /> - <br /> f �� 5 Jequirements LUFT manual) for USTs containing waste oil nalyzed'for <br /> `r the following analyses: <br /> PF2-91-19 2 <br /> n <br /> � +`copyright 1941 Kleinfeider; Inc. LI�EA �l , <br /> ENVIRONMEI RV <br /> PERM4T J SE_ iCES <br />