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06/27/2003 . 09:47 209832P WRIGHT ENVIRONMEk'~ PAGE 03 <br /> June 26,2003 <br /> Trost of 1' y Gardena <br /> Page 2 <br /> This data showed additional sand strata present at <br /> 1 l9!neer below site depthsof about CPT-2,at 52-57 ke4 s a yd 114- <br /> grade. Hoang CPT-1 showed apparently`correlative sand:trram aft 57-62 feet <br /> and another ;� sand strata at 1.13-120 feet. Additional vertical and laterad eXt�rrt c�`these <br /> straw zones is desired g`ven the a*-er=e ice of law to moderate concentrations of 1, 2�L CA as <br /> 11 as some apparently artorraaloiis migration of both 1, 2-DCA and <br /> site Eby is petroleums corrtam urauts. 4 <br /> suggestive of alluvia["chancre]'--cut and fill depositional eztvaronts anc i <br /> anmmmt work are wan-anted to attempt to gain more und� !these more <br /> ostrata aodies ' <br /> location WW extent. <br /> Wright and PHS EHD agreed that the site characterization sho'tcld proceed to assist in both strata <br /> eontam$cant zones location and"targeting additional .rno*rttag wells IOMIan arrrd sbtted <br /> intervals. The charactedzation would be nee&cj also for any cleaaxup plan. Four additional:wells <br /> J were required in the April 25, 2003 workplan. Additional we&May be �varranted to mo for 1, <br /> 2-DCA and petrnleucu ru ration at these different depths OM'?e the additional GPT borings are <br /> driled mW the stxatigtaphcc and chn=al gloun 'water data is reviewed. <br /> E <br /> Para nosed Addendum Additional 1:)H ting and Site Char^actezatiun Work Ta;sl,s � <br /> purposes to include the fallowirtg wazlc tasks as an addendum to the April 25, 2003 <br /> workplan. <br /> 4 <br /> Mill and log three additional Cane Penetro ter(CPT)borings at the locations show.I"onOn <br /> Figurine 1. These borings will be used to sample the,water bearing Lanes to farther <br /> delineate both site stratigraphy and contan*i mnt prescnee Qvundwatu samples fl-ow.52- <br /> 57 fed, and 114-119 feet and other zones'(if nog dWAsuggests) will be amlyzed for'the <br /> same contaminants as irdtailly proposed (that is Tonal Petroleum Hydrocarbon; as <br /> Gasoline (TPHG), Bele(B), Toluene(7), Ethylbenz�ne(E), Xylene (X), Methyl-t ehrt- <br /> but)rl-ether (MTBE}, a fuel oxygenates;tort-Amyl-]]derby]-Ether ('1 Alu�'E)7 Ethyl-9 err <br /> k Butyl-Ether (ETRE), Di-Isopropyl Ether (RIPE) and tea l-butyl Alcohol(TBA) and 1, 2-- <br /> (1,2-DCA)- <br /> • ReV18W of On-slte aud of,-site stratigraphy using all previous boring log data and the t3u7 " <br /> VOW borings. C,0010grc Crass sectton(s) will be prepared 1. to interpret the;overall site <br /> why and sand strata of interest. The review w"'place emP s 'fo l-the iaieral <br /> and veil variations of these strata and their apparent extent assumM that these 9.101, <br /> are the atential pathways d£highest by{iraulic conductivity. The sand strata at 5:: 51. <br /> P reLateral eXte-at and . <br /> deet, and 114-119 feet below site VWe *M be evaluated <br /> �rpreted channel deposition and lateral and vertical facies changes relation to t] <br /> strata zones on the site. <br /> 110ge'>:of 6 <br />