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4-0 FINDINGS <br /> The site investigation encountered contamination at all four study <br /> areas. At the washpad, soil contamination appears to be limited to <br /> the upper 6 feet. At both the downstream clarifier and the <br /> discharge pit, soil contamination extends throughout the entire <br /> depth (ten feet) investigated. Contamination was also detected in <br /> the flightline catch basin sediment sample . Specific findings for <br /> each study area are described in the following sections. <br /> 4.1 Washpad <br /> Three, ten foot deep, hand augered borings were successfully <br /> completed at the washpad. Apparent contamination based on odor and <br /> dis-coloration was observed in the upper 3-4 feet of borings 1 and <br /> 2. Figure 5 (page 11 ) illustrates the boring locations . <br /> A layer of dense hardpan was encountered at 5 . 5 feet in all three <br /> borings . Soil above the hardpan was apparently fill imported for <br /> site grading. Below the hardpan a dry, uncohesive sandy loam was <br /> encountered. Washpad boring logs are presented in the appendix. <br /> Analytical results from the m8015 (petroleum hydrocarbons) and 602 <br /> (purgeable aromatics) analyses are summarized in Table 1 . All <br /> samples tested non-detectable for all 8270 (semi.-volatiles ) <br /> analyses with the exception of 1100 PPB Bis (2-Ethylhexyl)phthalate <br /> detected in sample 1-1 . The detection limit for this compound is <br /> 1000 PPB. Original laboratory report forms, indicating minimum <br /> detection limits for each parameter, are presented in the appendix. <br /> TABLE 1 <br /> WASHPAD ANALYTICAL RESULTS <br /> ----------------------------------------------------------------- <br /> SAMPLE (PPM) (All BTXE values in PPB) <br /> ID LOCATION TPH BENZENE TOLUENE XYLENE ETHYLBENZNE <br /> 1 -1 Boring 1 @ 2 ' 316 ND ND 40 ND <br /> 1 -2 Boring 1 @ 7 ' ND ND ND ND ND <br /> 1 -3 Boring 1 @ 10 ' ND ND ND ND ND <br /> i <br /> 2-1 Boring 2 @ 2 ' ND ND ND 29 ND <br /> 2-2 Boring 2 @ 7 ' ND ND ND ND ND <br /> 2-3 Boring 2 @ 10 ' 234 ND ND ND ND <br /> 3-1 Boring 3 @ 2 ' ND ND ND ND ND <br /> 3-2 Boring 3 @ 7 ' ND ND ND ND ND <br /> 3-3 Boring 3 @ 10 ' ND ND ND ND ND <br />'� 15 <br />