|
v„
<br /> 1 . 11 June.2004 ' . - ,,' ..•; ': _ „ • , ,
<br /> • AGE-NC Project No. 95-0106
<br /> Page 5 of 6.
<br /> I ,
<br /> 3.4.,', ' ANALYTICAL RESULTS OF GROUNDWATER SAMPLES '
<br /> TPH-g acid BTEX compounds were detected only in the grab ground water samples collected at
<br /> fi'.: P ( PP Y g) p g g
<br /> *ater=table de th` a roximatel.,..10 feet bs' and at total de'`th of borin s B 17 and B 18:The highest
<br /> coricentrations'of contaminants were detected in the water table samples;at 160,000 micrograms per
<br /> liter (µg/1) TPH-g,in sample B 17-Y; and 5,600 µg11 benzene; 14;000 µg/1 toluene;`3,2001`µg/1
<br /> ethylbenzene and j2,000'µg/l xylenes in sample B1.8-1. /
<br /> At total depth, maximum TPH=g concentration was 3,900 µg/1 (B1h6,8-2 the BTEX
<br /> concentrations were considerably lower;benzene was not detected,maximum toluene concentration
<br />' was 3.8 4g11 (B18-2), maximum ethylbenzene concentration was 2.2_µg/l (B17-2) and maximum'.
<br /> C';,x'ylenes concentration was.16.8'Pg/1 (B18-2).:
<br />' -No other tar,getanalytes were detected in the'sam les analyzed.Analytical results from ground-water
<br /> ' samples.are summarized in Table 2. The laboratory`report (CTEL Lab ID CT214-0308117-and
<br />' CT214-0306069),quality assurance and quality control(QA/QC)and chain-of-'custody are included
<br /> in Appendix D.
<br /> .. 4.6. SUMMARY AND CONCLUSIONS
<br /> Based.upon soil and ground water data collected'during advancement of soil borings supplemented
<br /> by data from previous site investigations, AGE concludes:
<br /> • In',gene'ral,the soil profile,corisisted of brown-to tan-colored clay, clayey,silt,.or,clayey,fine '
<br />' sand from surface ade to.between 13 and 17 feet:bsg, underlain by predominantly fine to
<br /> .gt ;
<br /> coarse '"sand'and gravel, laterally, the coarser-grained soil appears -to be localized in a - .
<br />' northerly trend long the east side-of;:the property. .Grotind water was, encountered at
<br /> approximately I O,feet bsg.
<br /> • TPH-g and/or various BTEX compounds were detected in soil samples coll'ected'af or above
<br />' 10:feet bsg from borings B 16,B 17,B 18•and B20,at maximum concentrations'of 15,-mg/kg
<br /> TPH=g, 0:52 mg/kg benzene, 0.18 mg/kg toluene, 0:24 mg/kg ethylberizene and.1..15 -rig/kg
<br /> xylenes.,.The vertical and-lateral distribution of TPH-g in soil,is .depicted in Figures 6
<br /> through 8. F
<br /> ' MTBE was•.detected in soil samples,collected from borings B17 acid B18, at a maximum
<br />' concentration of 0:29 mg/kg.,MTBE was detected in soil samples collected• ro.m total depth
<br /> in-,bot borings at-a concentration of•0.012 mg/kg.
<br />' •. . Based on volumetric calculations, the,total volume°of remaining gasoline-impacted soil is
<br /> �. approximately 696gallons, or 4,352 pounds:
<br />' Advanced GeoE Aronmenta1,Inc.
<br />
|