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4 <br /> REGULATORY 6UIDEL18E5 <br /> 5.1 EVALUATION OF S91t I <br /> € �� Roardedointly publl shed thHealth <br /> e1e 11n,1ndergraund]Fuej Tankt[LUFT}Fields{" al <br /> goal....manual to aid representatives of the state and local agancies and - <br /> il hazardsconsultacreatednts in c by unauthorized releaseroUrd s¢f gasoline and diesel ions and the <br /> valuat products,9n of <br /> One section n-of the LU FT Manual provides guidance in establishing siteespecs Fir <br /> soil clean-pp levels for RT%aE and iPH. The manual suggests the investigator <br /> use two analyses for determining apprq.ria[e clean-up levels,first a leach5ng <br /> + rl potential ana]ysis and"second,a genera,risk appYalsal.-The leeching Dotenti al <br /> analysts.111 result 1n maximum allouablu residual se11 levels of 9T%EF and TPH, <br /> which are to b¢compared to analytical results obtained for each discrete sample. <br /> The general risk apps{sal Is then used to determine whether the GT%5E res5duals <br /> left in the sell will pose a continuing threat to groundwater resources. <br /> ,n yc <br /> The lea.hang potential analysts looks at Five site specific characteristics which <br /> tend tz lreatlY influence vertical contaminant nlgratlonl{1)groundwater depth,; <br /> L! (2)average annual preclpltation,(3)subsurface fractures,14)man-made conduits <br /> ff and (51 unique 31te Features. Eacffss of.the aforemel ioned characterlstics are <br /> l r� eva,uaEEed using a numerical scoring system from 0 to ]0, with a score of 10 <br /> ,J Indicating-1¢w Dotenti al for leaching. The LUFT'Hanual sots guidelines for <br /> scaring each characteristic. The sum of each of the Individual scares!:,then <br /> �i used to set maximum ailenable residual BT%8E and TPH levels that can be left 1n <br /> J' place without posing a threat to groundwater. <br /> Using the recommended LUFT procedure,the fallowing table Ilsts the site feature, <br /> fl the score and the sum Far.101 South Wilson Nay: - <br /> S <br /> ,eiitc Feature Smai•e I/ <br /> 1. Minimum Ulstance to groundwater from sail - 5 <br /> sample{greater than 25 feet but less than 50) <br /> ' 2. `Fractures in subs (none) .mountain area <br /> e) 10 <br /> (applies to foothills and sf 3 <br /> 3. Average Annual Precipitation )13.8•) 9 <br /> 4. Man-made Cmnd Its'(nava] ID U <br /> Lt 5. Unique slie features(none) ID <br /> soll.uetc-}echarga area, nearby wells, coarse �. <br /> f I , 44 <br /> i I/ Score approxsmated by LH Following LUFT rece—stations <br /> II: <br /> Li <br /> ' ' <br />