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SSE <br /> RR <br /> .-AM� <br /> 101-141011-4111-1-11-4 <br /> AfA <br /> 21 <br /> Mw� <br /> 3.0 RESULTS OF INVESTIGATIoll <br /> 3. 1 Laboratory Analysis <br /> Analytical roaulto for Boil damplan and groundwater unmplan are <br /> summarized in Table l. Laboratory data shoats, QA/QC reports, <br /> and chain-of-custody documentation are presented in Appendix D. <br /> 3*2 Quality Asouranco/Quality, Control evaluation <br /> Standard laboratory QA/GC was followed for analysis of Boil and <br /> groundwater aamplea. Laboratory spikes and duplicates provide an <br /> Qati=tO Of sample Analysis variance in order to establish vari- <br /> ance related to field fia2pling and laboratory handling. The <br /> Itboratory quality control reports for the sample analyses indL- <br /> cat* very low analytical variance. <br /> 3.3 Sit* Stratigraphy <br /> Soil borings ganorally ancountored fine grained low p* ability <br /> I <br /> $Oils. 'Lean anel fat Clays were generally obv;'rvad n the 15 to <br /> 25 foot zone. Sandy gilts to silty ilty sands occurred from 15 to Is <br /> feet, again depending on the boring. A return tea ICAD Clays <br /> dominated the two soil boring* that want beyond the 30 foot <br /> depth. Cross-nactions are presented in Figures 4 and 5, with <br /> Plan view orie►statjona ahown on Figure 3, <br /> 3.4 Field Inspection <br /> S0110 encountered war* monitored for organic vapors by placing a <br /> small amount of representative co <br /> pr <br /> sentative material in a sealed ntalner, <br /> then checking for petroleum hydrocarbon odors. Odors were noted <br /> at each measurement point and re-zorded on the boring logg. <br /> Soil samples submitted for analysis were sleeted based on obvi- <br /> ()Us sign* of contamination (1-0, odors, cc=antatien and soil <br /> discoloration) . The sample indicating the highest signs of <br /> contamination were analYzea to determine concentrations. T ,0 <br /> coafirmation samples, <br /> representing a 10 foot interval, <br /> were collected and analyzed to determine the vertical extent of <br /> the Boil contazLknation. The samples to be submitted for analysis <br /> which were at ambient ground temperature, vera cooled an quickly <br /> as Possible by Placement in An insulated ice chant with frozen <br /> blue ice. After initial cooling, <br /> samples were maintained between <br /> 0 and 4 degrees centigrade. Samples ware collected, preserved, <br /> and transported with a rAX/Irin thar=zater under chain-cf-custody <br /> in accordance with WaterWork's QA/QC plan <br /> (Appendix C). <br /> 4.0 CONCLUSXONS <br /> Laboratory analysis of the soils beneath the previous tank pit <br /> dhow <br /> & h4h levels Of 94solint.hydrocarbons at depth between 10 <br /> 20 <br /> ..red fset6 . The concentrat no <br /> OZ Of gasoline hydrocarbons drop <br /> f significantly With depth due to the low permeaLbility of than <br />