ARCHIVED REPORTS_XR0007743 - Laserfiche WebLink

Home Browse Search

8820101-R COT-8 bottom of MW-3 is actually the result of moisture accumulation in the well and not groundwater infiltration. In anticipation of a seasonal rise in ryl the water table, another site visit will be made after the first few significant winter storms to monitor for fluid levels and, if possible, sample Well MW-3. Soil Contamination Soil contamination was encountered to varying degrees in Borings MW-1 and MW-2 while no contamination was detected in Boring MW-3. Three samples from Boring MW-1 were submitted for analysis based primarily on headspace readings and odor notations made during drilling. Sample MW1-25 was selected due to the high headspace reading and strong apparent hydrocarbon odor. Sample MW1-45 was chosen also because of its high headspace reading as well as its close proximity to the water table (assumed to be 45 feet below grade at the time of drilling) . The final sample, MW1-60, was submitted for analyses based on the relatively high headspace reading and in an attempt to better evaluate the lower extent of vertical migration. Two samples (MW2-35 and MW2-45) were submitted from boring MW-2, again based primarily on headspace readings and proximity to the assumed water table location. Similarly, two samples from the same depths (MW3-35 and MW3-45) in Boring MW-3 were selected from headspace readings and assumed rproximity to the water table. ' The results of the soil sample analyses found that only one sample (MW2-35) taken from a depth of 36 feet in Boring MW-2 contained detectable TPh at a ' relatively high level of 2,200 mg/kg (ppm) . Moderate levels of BTEX were also found in that sample, although no lead or EDB was detected. The sample from 46 feet in MW-2 (Sample MW2-45) was also found to contain low levels of BTX. The only other soil sample containing detectable 11