Laserfiche WebLink
1 <br /> 16 November 1992 <br /> (GeoAudit CV43C5-1. 61) <br />' Page 2 of 3 <br /> For each sample, the lead tube was screened for the presence of <br /> volatile organic hydrocarbons with the photo-ionization detector. <br /> Both ends of the tube were then covered with aluminum sheets, <br /> capped and sealed with tape. The samples were stored on ice pending <br />' <br /> transmission to a state certified laboratory. The samples were <br /> analyzed by Sparger Technology, Inc. Soil was extruded from the <br /> second and third tubes and described in accordance with the Unified <br /> Soil Classification System (see Boring Logs) . <br /> A photo-ionization detector was used to screen the soil samples and <br /> auger returns for the presence of organic vapors (PID: Thermo <br />' Environmental 580A, 10. 0 eV, calibrated to isobutylene) . <br /> A total of five samples (B1-20, B1-30, B1-40, B1-50, B1-60) were <br /> analyzed for total petroleim hydrocarbons (TPH as gasoline) and <br /> purgeable aromatics (BTE&X) and two samples (B1-20, B1-60) were <br /> analyzed for total lead. <br /> FINDINGS <br /> Hydrocarbon contamination was evident during drilling, with strong <br /> hydrocarbon odors and PID readings ranging between 150 ppm and 1500 <br /> ppm between 10 and 30 feet in B1. Based on these results, drilling <br /> was continued instead of terminating at the proposed depth of 30 <br /> feet. Contamination decreased below 30 feet, but slight odors and <br /> low PID readings were detected as deep as 60 feet. Contamination at <br /> this depth implied a much larger volume of contaminated soil than <br /> previously anticipated, as well as the possibility of groundwater <br />' contamination. However, since the installation of monitoring wells <br /> had not been previously proposed or approved and no well supplies <br /> were available on site, a decision was made to suspend drilling. <br /> Samples from B1 were transported to the laboratory for analysis. <br /> TPH as gas was detected in samples B1-20 (93 µg/g) , B1--30 (6, 100 <br /> pg/g) and B1-40 (13 µg/g) . Benzene, toluene and xylene were <br /> detected in all samples except BI -60, at levels ranging from 0. 007 <br /> gg/g (xylene, B1--50) to 520 µg/g (toluene and xylene, B1-30) . <br /> Ethylbenzene was detected in samples B1-20 (3 . 5 gg/g) , B1-30 (170 <br /> µg/g) and B1-40 (0. 37 gg/g) . <br /> Lead was detected in B1-20 at 11 µg/g and in B1-60 at 9 . 3 gg/g. No <br /> other samples were analyzed for lead. The laboratory results are <br /> summarized in Table 1. The laboratory reports and chain of custody <br /> are attached in Appendix A. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The results of this investigation indicate that an unauthorized <br /> release of hydrocarbons has occurred and soil contamination extends <br />