Laserfiche WebLink
e <br /> 1 13 duly 1992 <br /> (GeoAudit CV 55-59 E2_1'32) <br /> Page 4 of 8 <br /> 4.0 RXDROCARBON CONTAMI2dikTION <br /> 4.1 FIELD EVIDENCE OF CCNTAMINATION <br /> logs, all samples collected <br /> As noted in the boring at 10 and l5 <br /> e feet of the vault emitted moderatAto <br /> a�:V <br /> feet from borings within below 15 feet .did not exhibit <br /> samples -from borings located more <br /> strong diesel odors. Samples from ed from 0 ppm for most <br /> ..hydrocarbon odor, nor did any readings rang agreed <br /> the vault.- PID r PID readings generally g <br /> than 8 feet 2 ppm <br /> m for sample 5B5-10. were present at 10-15 <br /> samples to 42 pP �s observation that vapors <br /> with the geologist <br /> feet but not below this depth. <br /> 4.2 LABORATORY RESULTS <br /> i resented in Appendix A and summbyriMcCain <br /> rein <br /> sults are presented <br /> samples collected vault, a <br /> Laboratory Including the s beneath the <br /> Table I. hand-auger boring <br /> ' ped for 'PPH. Nine of these were aall <br /> sO <br /> Environmental from le were hanna Y ug was reported in <br /> total of 27 same Motor oil contamination oil and diesel <br /> analyzed for BTEX• samples, and both motor t SB-6 and <br /> hand-auger s except <br /> three les collected <br /> in the same <br /> contamination were encountered in all soil .bo kind .was '•��' <br /> c BTEX contamination wars detected <br /> contamination of any - <br /> from er boring <br /> from the Nanny samples below 23 ft. <br /> detected in any - <br /> 4.3 VERTICAL EXTENT OF CONTAMINATION contamination .is <br /> s around the perimeter of the vault,ed at de th..of.-10 <br /> In most boring htly eonsolida' edeetl� Beneath the vault, <br /> Z eaent within the.sliq and Z0.-. samples from <br /> encountered in all th_and._ <br /> �t but absentcontaminationawere es rap. with_.dep <br /> high levels of the thicker <br /> this silt bed, but__contam,ination decreases resent in ures <br /> _ --- <br /> est that no contamination�___.p�-feet iFig� -- 3 and <br /> the. data .sugg — - -"to at least <br /> the downward <br /> extends�fran►_..2 _ ..____ inhibited <br /> s 1t. .bed that �t silt beds <br /> that the two rai::ion _exceeded <br /> q) . Y _appear -- oil" _, and.._tYiat lateral meg ears to... <br /> of heating r th of conta� nalan app pears_r tide plumeisre.latively <br /> vertical lm gra10_* The_max�____im h d o n o� vault. <br /> be abo-25---feef- igure 3) . The _ __ -m.-- - . <br /> but rises abruptly near the south wall of the <br /> .flat, <br /> Y 4.4 LATERAL EXTENT OF CONTAMINATION of hydrocarbon <br /> show that the maximum lateral extent feet. Figure 5 <br /> Figures 3 and depth of approximately depth, E:nd <br /> . ccurs at can aination values at this P <br /> contamination _ to the immediate <br /> - - - - ---- contour--map-- of <br /> ---- -- -- <br /> -�, is_-a- p contamination-is-restrlc_eats-to-be-somewhat___--------- _ _-_ <br /> demonstrates that th- plume app <br /> axis oriented no around the with anTarcuate along n <br /> kidney-shaped, <br />