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r t r l-• vF}J:r -•;� :Ts t "�, <br /> a � d dt "='tau r: .i c...t E.' <br /> 5 <br /> F <br /> samples <br /> tamination in the unsaturated substrate- Boreholcs from ;which Sam- <br /> were obtained were r <br /> drilled using a t`14E 75 hollow-Stem auger ig• <br /> s inch <br /> pies were taken pursuant to each five frocesstcantinuednuntillground- <br /> California split spoon sampler. This p <br /> r edswith�7brassesleeves whichunterd or to a th Of 31.5 feet.were decontaminatedePrio itO their <br /> el- was <br /> equi <br /> equ watePP <br /> reuse. <br /> Each brass sleeve containing a sample was field <br /> Greened using a Pho- <br /> tovac TIP I-Photo Ionization Dethe of thehelectronic <br /> sleevewherethe surfacenof <br /> The instrument was run past an <br /> the soil had been by <br /> disturbed to allow far volatiles <br /> ° lreadingeonethetPhoto- <br /> the meter. Samples which registered a positive <br /> vac were capped and taped an both ends and placed in an iced cooler <br /> f <br /> until their delivery toLabsaisgiven ira <br /> nAppendixB• Each /QC samplenwas <br /> for Sequoia Analytical constituents: <br /> analyzed for the following <br /> Low to Med Boiling Pt. Hydrocarbons <br /> Benzene Pt. Hydrocarbons (Diesel) <br /> Toluene High Boiling <br /> Xylenes <br /> Petroleum oil (motor oil) <br /> Ethyl Eenzene <br /> Locations of the borings are shorn in Figure 3. The area in this di-j <br /> agram is denoted as the inset in Figure 2. <br /> 4.2 Analytical Results of Soils Analysis <br /> Laboratory analysis reports for the soil samples are given in Appen- <br /> dix A. The data reveals low levels <br /> contamination at nearlyreasoas for <br /> sample intervals above ground petroleum an <br /> oil faun <br /> this are two-fold. The high levels _ctivelel are most likely present <br /> in sample 3A, 2300 and 5400 ppm resp Yr <br /> as a result of spillage from the fuel island located just rorth of the <br /> sample point. The fluid has lea ked roundto tin thhe istarea.rate v�High aconcen- <br /> the concrete slab which covers the g ectiv- <br /> tratiors of these same two constituents. 3300 and at a depth of ppm resp <br /> ely, were also found <br /> tInissample <br /> just beneatwhich <br /> twas <br /> he b taken <br /> se ofathe excavation0 to <br /> 21.5 feet. P <br /> which lies at 18 ft, The of leakagetence ofromntheitanksnontthis level <br /> their northern <br /> is most likely the result of leakage that ran northwards towards <br /> facing flanks or in the associated piping <br /> the fuel island. Levels o ft conthe amination i nttfarrdieseaefuel beingam- <br /> ples are al Y <br /> 5.6 ppm and 70 ppm for petroleum oil. <br /> and <br /> ing <br /> Figures 3 through 8 illestOf <br /> obtainedresults from thelelboreholesnfor eachlaborsample <br /> atory analysis of same <br /> interval. The figures not the lab.which <br /> lab, <br /> was not detected by any <br />