ARCHIVED REPORTS XR0011419 - Laserfiche WebLink

Home Browse Search

' Geological Tecwa kc Page 6 Groundwater Monitoring Report Project No 425 2 May 10,2005 ' Domestics Wells: • Three domestic wells (1697 D F , 1600 `A' D F and 31448 Hwy 33) were tested and found non-detect for the tested gasoline constituents above the laboratory detection ' limits 3.0 FINDINGS AND DISCUSSION The laboratory analytical data generated during the April 11, 2005 groundwater-monitoring event indicates that TPH-G constituents have been detected in Zone A&Zone B The results of the April 2005 event are comparable with the results from previous morutoring events The following observations are made Zone A: ' • The horizontal groundwater bearing calculated from the Zone A wells, is currently towards the northeast • TPH-g and BTEX concentrations in MW-1 (Table 8 A & Figure 7) varies widely ' historically • MW-2 continues to show high TPH-g and BTEX concentrations 1,2-DCE detected in MMW-2 indicates the degradation of MTBE • Contamination has not been detected in MW-3 This indicates that the contamination plume has not reached MW-3 ' • MW-4 continues to show nearly constant TPH-g concentrations This indicates that contamination plume is not moving towards MW-4 • MW-5 shows the seasonal variations in contaminant concentrations • MW-6 & MW-7 remained non-detect However, trace concentrations of 1,2 DCE has been detected in MW-7 • The analytical data of MW-8 indicates that the contamination plume is widening towards MW-8 Zone B: • The bearing calculated from the Zone B wells is to the northwest • MTBE and 1,2 DCE were detected in MW-106 among the Zone B monitoring wells which indicates movement of very small contamination through a thin lens of sand ' towards MW-106 However, Zone B appears to be free from gasoline contamination plume Zone C & D: • Vertical groundwater gradients were positive in the Zone A / Zone B and Zone B /Zone D well parrs • Zone C &Zone D appears to be out of contaminant plume area