Laserfiche WebLink
/4961=41- <br /> SEOM TRIX <br /> result for benzene has been audited with a "U" indicating that the result as undetected because it <br /> is less than five times the trip blank detection for that compound The remaining monitoring <br /> well sample results were either more than this Ievel or not detected, indicating the analytical <br /> results were not compromised Recoveries of surrogate spikes were within laboratory quality <br /> control limits <br /> 3.2.2 Analytical Results <br /> Analytical results for quarterly monitoring parameters are presented in Table 3 During second <br /> quarter 2004, groundwater samples from the five sampled wells had detectable concentrations of <br /> TPHg or BTEX <br /> Groundwater wells MW3-4 and MW3-5 are background wells, wells MW3-1, MW3-2,and <br /> MW3-3 are completed near the former UST, and well MW3-6 is a downgradient well <br /> Groundwater samples from the downgradient well and the wells near the former UST <br /> consistently have detections of TPHg and BTEX compounds (Table 3) Low concentrations of <br /> TPHg and BTEX compounds have been detected well MW3-4 but these compounds generally <br /> are not detected an well MW3-5 (Table 3) <br /> During second quarter 2004, the highest concentrations of TPHg and toluene were detected an <br /> the groundwater sample from well MW3-2, the highest concentration of ethylbenzene and <br /> xylenes were detected in the groundwater sample from MW3-1, and the highest concentration of <br /> benzene was detected an the groundwater sample from well MW3-6 <br /> 3.3 SUPPLEMENTAL MONITORING RESULTS <br /> Groundwater elevation data from the supplemental monitoring are consistent with historical <br /> groundwater elevation data (Table 1) Review of laboratory quality control data on the APPL <br /> analytical reports dad not identify quality control issues that would compromise the analytical <br /> results (Appendix B) Analytical results are included in Table 3 Results of the April 1, 2004, <br /> sampling in wells MW3-1, MW3-2, and MW3-6 are consistent with historical detections <br /> Analytical results from wells MW34 and MW3-5 are not consistent with historical results <br /> Benzene, which was detected at low concentrations just above the method detection level in <br /> wells MW3-4 and MW3-5 in the supplemental samples, had not been detected previously an <br /> these wells Additionally, toluene, ethylbenzene, and xylenes, which have been historically <br /> detected an these wells, were not detected during the supplemental monitoring <br /> } I TR07EC r%0Ws%417 000/6437 zl doc 4 <br />