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14 September'1998: <br /> AGE-NC Project No.'.98-0440 <br />' a �-Page'.b of•f 9. ,y ` -• ,, . � ' ' - , :. ; ' . .... ` '. ,. <br /> Following collection;.each sample was logged on a•chain-of-custody. form, placed in a chilled' : <br /> container and transported to a California state-certified lAboratory'foi,analysis in accordance with .y <br /> the'followiri <br /> g • <br />'i EPA Method'801 SN1 for TPH•g and TPH-d, respectivel <br /> y, <br /> • EPA Method 8020 far BTEX with MTBE, and <br /> 1', • EPA Method 8260 for TBA;DIPE,'ETBE and.TAME; and to confirm'and quantify MTBE <br /> ._ if detected by EPA Method-8020.7he results of-the analysis are contained�in Table 3. <br /> 4.0. .FINDINGS <br /> • <br /> 'Results of field,observatioris and laboratory_ analysis of soil-and ground water samples are reported <br /> Iand discussed in the following sections.. <br />'. 4:1',,' , SOIL PROFILE <br /> A mottled,pale brown and red-brown,,stiff,-clayey silt/silty clay waslencountered from surface grade <br /> I ' to,depths of approximately.5`feet bsg in each boring.A"pale to dark gray-green, silty, medium dense, <br /> poorly'sorted fine'sand.was generally encountered from 5 feet to 10 feet bsg.-A pale brown to pale <br /> gray, stiff, silty'clay was encountered from 10 feet.to.20„feet•bsg.-A pale,brown;'mediurn.dense, <br /> rl sorted' silt fine sand was enerall encountered at depths.between 20-feet and 25 feet bs <br /> i Y tY g,, y P g- <br /> A dark brawn;we stiff:sil c1a was-encountered at depths eater than 25 feet bsg. <br /> rY t}' Y p <br /> :Contamination detected in MW-1'may be moving'differeritly ti,an that-detected in•'MW-2 and-MW-3 r <br /> `due to 'different sand bodies contributing'#o the wells(Figure 14): ; <br /> Saturated soil-was'encountered in each-borir g at depths,of approximately 10 feet bsg. Boring logs. <br /> are included iii Appendix"A. Generalilithology.beneath the site.in cross sectional view is depicted <br /> .. in Figures.3 and 4: <br /> 4.2. FIELD EVIDENCE i0F HYDROCARBON-IMPACTED SOIL AND GROiJND.WATER• <br /> Moderate to strong'petroleurn°hydrocarbon odor,was'noted in sample duplicates collected from.soil. w <br /> borings B] 'through B4, B6;'and MW-1 through MW-3,between 10-and 17 feet bsg. Furthermore; ' <br /> organic,vapor-was.detected(using'a PID)in soil sample duplicates,at concentrations as high.as,493 - <br /> i parts per'million(PPm) <br /> i <br /> i Ads nr ed'G oEnvironmentai;Ina. <br />