Laserfiche WebLink
DISCUSSION <br /> Results of this groundwater monitoring event indicate that levels of dissolved gasoline hydrocarbons <br /> remained generally consistent from the previous sampling events TPHG and BTEX concentrations <br /> decreased in wells MW-3 and MW-4 MTBE was detected in wells MW-1, MW-3, and MW-4 at <br /> concentrations of 19 3 ppb, 6 52 ppb, and 62 2 ppb, respectively, using USEPA Method 8260 DIPE was <br /> detected in well MW-1 at a concentration of 4 28 ppb, and tertiary butanol was detected in well MW-4 at a <br /> concentration of 255 ppb, using USEPA Method 8260 The groundwater flow direction (southeast to <br /> northeast) and gradient are consistent with previous sampling events Groundwater elevation increased <br /> 0 82 foot from the previous sampling event (December 1999) <br /> ARCO will transfer this project to another consultant The new consultant will begin providing services <br /> during the second quarter 2000 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Groundwater Flow Direction and Gradient <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Analytical Summary (First Quarter 2000) <br /> • Figure 3 Groundwater Elevation Contours (First Quarter 2000) <br /> • Appendix A Field Procedures <br /> • Appendix B Laboratory Analysis Reports for Groundwater Samples and Chain-of-Custody <br /> Records <br /> • Appendix C Groundwater Monitoring Field Data Sheets <br /> CP 1N1CamPklDatalArchiveWrco121681Q1rly12168Q1U0 DOC-98ut 1 IT Corporation <br /> 05/17/00 <br />