ARCHIVED REPORTS_XR0007084 - Laserfiche WebLink

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2000 The wastewater was transported by M P Environmental Services, Inc via a non— hazardous waste manifest to Seaport Environmental Services in Redwood City, a licensed wastewater recycler The wastewater from the previous December 2, 1999 quarterly monitoring round was transported and recycled by the same methods on February 10, 2000 See Appendix D for copies of the non-hazardous waste manifests GROUNDWATER GRADIENT AND FLOW DIRECTION Figure 4 shows the groundwater elevation gradient and flow direction determined from depth to water measurements at the three on-site monitor wells on February 23, 2000 The groundwater elevation has increased by an average of 0 87 feet at the three monitor wells since the previous quarterly monitoring round on December 2, 1999 The flow direction is to the south The overall gradient is 0 025 feet/linear foot RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES The results of the certified analyses of groundwater samples collected from the three monitor wells on February 23, 2000 are shown in Table 1 Copies of the laboratory reports are included as Appendix C of this report TPH-G concentrations ranged from a maximum of 5000 ug/1 at monitor well MW 1 to 2700 ug/l at monitor well MW2 • Benzene concentrations ranged from a maximum of 2700 ug/l at MW1 to 930 ug/I at MW2 MTBE concentrations ranged from a maximum of 1 I ug/l at MW 1 to less than the laboratory detection limits of 1 ug/I at MW2 The remaining four fuel oxygenants, TBA, DIPE, ETBE, and TAME were not found in concentrations above the laboratory detection limits of 50 ug/l, 1 ug/l, I ug/l, and 1 ug/l respectively in any of the three monitor wells 1,2 Dichroloethane concentrations ranged from a maximum of 37 ug/l in MW3 to 21 ug/1 in MW1 1,2 Dibromoethane was not found in concentrations above the laboratory detection limits of 1 ug/l in any of the three monitor wells Certified laboratory analysis using EPA method 8260 detected additional compounds associated with gasoline not reported by the EPA method 8020 These included Isopropylbenzene, n-Propylbenzene, 1,3,5 Trimethylbenzene, 1,2,4 Trimethylbenzene, sec- Butylbenzene, p-Isopropyltoluene, and Naphthalene The concentrations of these compounds at the three monitor wells are listed in Table 1 1,2,4 Trimethylbenzene showed the highest concentrations of these compounds, ranging from a maximum of 310 ug/1 at MW1 to 44 ug/l at MW2 Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater and the estimated lateral limits of the TPH-G in groundwater as determined from groundwater 3 Are Pump QM 1-3, 2000