Laserfiche WebLink
k <br /> 5 <br /> 03 April 2000 <br /> AGE-NC Project No 98-0511 <br /> Page 5 of 6 <br /> 180 ppb (reported as micrograms per liter) and 93 ppb,respectively <br /> Utilizing EPA Method 8020, BTEX compounds were detected at concentrations as high as 25 ppb <br /> in grab ground water samples collected from B2 <br /> Utilizing EPA Method 8260, MTBE was detected in grab ground water samples collected from B1, <br /> B2, B3, and B4 at concentrations of 250 ppb, 120 ppb, 23 ppb, and 7 1 ppb, respectively <br /> The analytical results of water samples are summarized in Table 2 The laboratory reports and chain- <br /> of-custody forms are included in Appendix B <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the 16 April 1999 soil probe bonngs, and grab ground water <br /> sampling, AGE concludes <br /> • Field observations, OVM readings, and laboratory analysis indicate that the most significant <br /> hydrocarbon-impacted soil encountered during tivs investigation was recovered from boring <br /> B 1 at a depth of 20 feet bsg <br /> • Laboratory analysis of soil samples indicate that MTBE is presented at relatively low <br /> concentrations in boring B1 at depths of 20 to 30 feet bsg <br /> • Laboratory analysis of the grab ground water samples indicate that the highest concentrations <br /> of TPH-g and BTEX compounds were in soil samples recovered from borings B2 and B3 <br /> 6.0. RECOMMENDATIONS <br /> Based upon data collected during March and April 1999, AGE recommends <br /> • Completion of a well/sensitive receptor survey <br /> • Further subsurface investigation focused in the down-gradient direction, based on the 16 <br /> March 1999 ground water monitoring event data (west-northwest), and southwest of the <br /> subject property (the historically predominate direction) to determine the lateral extent of <br /> petroleum hydrocarbon-impacted and MTBE-impacted ground water <br /> Adianced GeoEmlronmental,Inc <br />