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_ �x J°�s -v.. csv_ x �:x'°:k.', r_ j-il;*`�-�F'Fje`e'2. .:»..,��. ` ..� 'a'_ "sYu�y"p 7z , -'✓^' � "s!Gk"'. xr" c .,".e sc ;ti <br /> � <br /> WON <br /> r+^ <br /> . a _. <br /> ' -� 'r - � o, sC` .pj� n 4 ,n.u7a�' ���..$�'"` � � ��-'�✓� �o� `ar >r�. a �a -t t r,-�„r�c��c - .a <br /> g - <br /> 1-[C.l.[] IrlVC511GATI0N <br /> llased on site conditions as disclosed through research and <br /> recunnaissance, a total of four soil borings were drilled at the <br /> 4 :,ee fiqure '11. One of three borings (5-1 ) was drilled west of it <br /> tarsk comrilex, the other borings were drilled west of the northern <br /> lirorin(:t L'-lapid IS-A), west of the southernmost product island ( 5-ij) , <br /> arrd ea-,t of the middle procur.t island (5-C), Bor•inq (5-A) 115 also <br /> located near' the northern end of the tank complex. The west rnmest <br /> bor irsy f S- I ), placed on the doungradient (west ) side cf V L tank <br /> r;ntended to SS.5 feet in depth. [his 'boring encountered <br /> rli'{rursd brater arrd was converted to a groundwater observation well. <br /> Detailed descriptions of the field procedures and boring logs are ' <br /> included in Appendix A. <br /> Results <br /> The four exploratory borings drilled at the site encountered similar <br /> conditions. The site is underlain primarily by clay to the maximum <br /> depth explored of 55.5 feet. The total depths of Borings ',i-B and S-C <br /> were ZO feet each. Borings S-A and 5-•1 were extended to depths of 45 <br /> and 55.5 feet, respectively. <br /> Ground water was encountered in Boring 5-1 only, at a depth of <br /> approximately 49 feet_ The ground water level later stabilized at a <br /> depth of approximately 46.5 feet. With only one well at the site, <br /> the site gradient cannot be calculated. However, it is assumed that <br /> ground water is moving in the direction of regional flow, to the <br /> northwest. <br /> ANALYTICAL RESULTS <br /> Selected soil samples were analyzed for total hydrocarbons according <br /> to EPA Method 413.Z. The water sample from the observation well was <br /> analyzed for volatile organic compounds, including benzene, toluene <br /> and xylenes (BTX:, according to EPA Method 602. Various other <br /> samples were analyzed for quality assurance/quality control (QA/QC) <br /> purposes, as described below. The analytical techniques are <br /> described in Rppendix C, which also contains the Certified Analytical <br /> Reports. The following Table I summarizes the analytical results. <br /> 100-12.01 Page 2 <br />