ARCHIVED REPORTS XR0009296 - Laserfiche WebLink

Home Browse Search

4010gfea!rechwcs lice Page 6 Groundwater Monitoring Report Project No 723 2 April 24, 2006 ' o U gradient well MW-9 contained 70 ug/l TPH-G This is the third P g 1� consecutive event in which this contaminant was detected in this well o Down gradient well MW-8 contained 5700 ug/l TPH-G • The intermediate wells contained TPH-G concentrations ranging 76 - 100,000 ugll ' o The highest level of TPH-G (100,000 ug/1) was detected in well MW-3 that is located in the vicinity of the former dispenser island o Up gradient well MW-109 contained 76 ug/l TPH-G and this is the third ' consecutive detection of this constituent since the well's installation o Down gradient well MW-108 contained 1700 ug/l TPH-G • The deep wells contained TPH-G concentrations ranging 41 — 1800 ug/l ' o The highest level of TPH-G was detected in well MW-208 that is located down gradient of the former dispenser island o Well MW-207 contained TPH-G for the Sixth consecutive event This well previously defined the northerly extent of the plume o Up gradient well MW-209 contained 41 ug/l TPH-G This is the second time it has been detected in this well that is usually non-detect for TPH-G ' • Deep well MW-101 contained 520 ug/1 TPH-G 3 MTBE • None of the wells sampled contained MTBE above the laboratory reporting limits • EPA Method 8260B was utilized for this event ' 4 Benzene • The shallow wells contained benzene concentrations ranging <0 5 - 130 ug/l ' o The highest level of benzene was detected in well MW-5 that is located cross gradient of the former dispenser island o Well MW-9 defines the up gradient extent of the benzene plume ' o Down gradient well MW-8 contained 9 9 ug/l benzene • The intermediate wells contained benzene concentrations ranging <0 5 — 11,000 ug/l o The highest level of benzene was detected in well MW-3 that is located in the core of the gasoline plume o Well MW-109 defines the up gradient extent of the benzene plume o Down gradient well MW-108 contained 14 ug/l benzene ' • The deep wells contained benzene concentrations ranging<0 5 — 83 ug/l o The highest level of benzene was detected in well MW-208 that is located down gradient of the former dispenser island ' o Well MW-209 defines the up gradient extent of the benzene plume ' 5 Other gasoline constituents detected • Well MW-8 contained 5 8 ug/l 1,2 DCA . • Well MW-108 contained 48 ug/l TBA and 49 ug/l 1,2 DCA 1