kb5691-6 gw flow 3-10mbbr zone memo to cp-16dec08
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MEMORANDUM
DATE: December 16, 2008 TO: Christopher Prucha (WM) C.C: FROM: François Richard (WESA) PROJECT #: K-B5691-6 SUBJECT: WM Richmond Landfill: Groundwater Flow in the Zone 3-10 m
below Top of Bedrock MESSAGE: Chris: This memorandum addresses questions raised by MOE hydrogeologists Kyle Stephenson and Frank Crossley during our meeting held in Kingston on November 25, 2008. During the meeting, the site conceptual hydrogeologic model was discussed, including the rationale used to identify groundwater monitors representative of the active flow regime and therefore suitable for contouring. It was agreed that the primary pathway for groundwater flow and potential leachate migration is comprised of the saturated overburden and upper bedrock. However, the MOE noted that most of the monitors retained for the contouring and interpretation of shallow groundwater flow direction are screened in overburden and/or in the upper 3 metres below bedrock surface (mbBR). Concerns were raised about water levels and groundwater flow directions in the portion of the bedrock immediately underlying this shallowest hydrostratigraphic unit, that is, groundwater flow in the zone 3-10 mbBR. Specifically, discussion focused on the hydraulic connectivity between this zone and the shallowest zone, and whether the groundwater flow direction is consistent between these two zones. To address these questions, it was agreed that groundwater monitors screened between 3 and 10 mbBR would be examined and the groundwater flow interpretation reviewed. Monitors partially completed in the upper 3 mbBR were excluded in order to better assess the groundwater flow regime in the 3-10 mbBR zone alone. Historical hydrographs and monitor construction details were carefully reviewed for each of the 36 monitors screened in this zone and located in proximity to the existing landfill, which were then classified in terms of their suitability for groundwater contouring in accordance with the agreed-upon methodology used previously (see Table 1). Suspect construction integrity and absence of hydraulic connection were the principal reasons to classify monitors as unsuitable for contouring. Figure 1 identifies the monitors screened in the 3-10 mbBR zone, along with groundwater elevations measured on October 14, 2008. Monitors suitable for contouring are shown in green, while monitors not suitable for contouring are shown in red. Suitable water levels were
WESA Inc. 3108 Carp Rd, Box 430, Carp (Ottawa) Ontario Canada K0A 1L0 Telephone: 613-839-3053 Fax: 613-839-5376 E-mail: frichard@wesa.ca Web: www.wesa.ca
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contoured, and confirm that water levels in the 3-10 mbBR hydrostratigraphic unit are consistent with previous interpretations presented of shallow groundwater flow directions, most recently in a figure presented during the meeting (October 2008 groundwater elevations and contours), and previously in WESA (2008)1 for groundwater elevations measured on June 27, 2008. In particular, the groundwater divide running approximately parallel to the Empey Hill drumlin has an influence on groundwater flow directions down in the 3-10 mbBR interval. Note that monitoring wells M6-3, OW1 (both located to the north of the landfill) and OW57 (located at the southwest corner of the landfill), have historically been used in the contouring for the uppermost hydrostratigraphic unit; they are also used in the contouring of the 3-10 mbBR unit since they are screened in this zone. Based on the information above, it can be concluded that the saturated overburden and the upper 10 mbBR behave as a single monitorable hydrostratigraphic unit. The interpreted shallow groundwater flow directions show minimal differences in the 3-10 mbBR zone compared to the shallower zone. It is therefore appropriate to use groundwater monitors screened in the overburden and/or in the upper 10 metres below the bedrock surface to characterize shallow groundwater flow at the Richmond Landfill.
1 WESA, 2008: June 2008 Supplemental Hydrogeological Investigation – Richmond Landfill, memorandum to C. Prucha (WM), July 23, 2008
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Table 1. Groundwater Monitor Details, Water Levels and Suitability for Contouring
Ground Elevation
Screen Top
Screen Bottom
BR Elev
BR-10m
BR-3m Groundwater
Elevation Monitor Type
(masl) (masl) (masl) (masl) (masl) (masl) (masl)
Suitable Notes
M3A-3 multilevel 126.96 117.96 115.96 122.00 112.00 119.00 124.48 Yes Seasonal
fluctuations
M4-3 multilevel 125.64 117.14 115.64 122.64 112.64 119.64 123.36 Yes
Relatively constant water levels;
possible seasonal fluctuations
M5-3 multilevel 123.20 117.20 115.70 122.44 112.44 119.44 123.33 Yes Seasonal
fluctuations
M6-3 multilevel 123.73 118.73 117.23 122.23 112.23 119.23 123.43 Yes Appears suitable; possible integrity issues beginning
M9-3 multilevel 124.80 115.50 114.00 121.90 111.90 118.90 119.71 No Suspect Integrity
M10-2 multilevel 126.47 114.47 112.47 123.47 113.47 120.47 125.11 No Suspect Integrity
M10-3 multilevel 126.47 119.97 116.97 123.47 113.47 120.47 120.89 No Suspect Integrity
M46-2 multilevel 123.96 117.66 116.16 123.66 113.66 120.66 123.33 Yes Seasonal
fluctuations M47-1 multilevel 126.82 117.42 116.12 121.82 111.82 118.82 123.67 No Still recovering
M48-2 multilevel 134.11 115.11 113.81 119.21 109.21 116.21 122.41 No Suspect Integrity
M49-2 multilevel 125.47 114.97 112.67 122.77 112.77 119.77 119.64 No Suspect Integrity
M50-3 multilevel 125.25 116.25 114.75 122.00 112.00 119.00 124.24 Yes
Seasonal fluctuations; use
with caution (integrity issues in
deeper screens M50-1 and -2)
M51-2 multilevel 129.75 117.75 115.75 124.95 114.95 121.95 124.29 Yes Possible seasonal
fluctuations
M52-3 multilevel 128.78 122.08 120.78 126.88 116.88 123.88 124.53 Yes
Very low K but water level
equilibrated since ~2001
M54-3 single 123.99 111.99 108.99 119.88 109.88 116.88 123.35 Yes Seasonal
fluctuations
M56-2 single 126.12 112.32 109.32 118.20 108.20 115.20 122.45 Yes Seasonal
fluctuations and good producer
M58-3 single 125.32 116.32 113.32 121.21 111.21 118.21 122.45 Yes Seasonal
fluctuations M59-4 single 124.63 117.63 115.43 124.02 114.02 121.02 122.44 No Suspect Integrity
M60-3 single 125.86 113.36 110.86 122.66 112.66 119.66 124.34 Yes Slow recovery but possible seasonal
fluctuations
M68-3 single 124.41 112.41 109.91 122.28 112.28 119.28 123.91 Yes
Very slow recovery (1998-2000) but water level stable
since M70-2 multilevel 127.05 115.05 113.55 124.61 114.61 121.61 121.10 No Suspect Integrity
M74 single 125.04 117.68 115.51 121.92 111.92 118.92 122.97 Yes Seasonal
fluctuations
M75 single 123.57 118.98 116.64 122.53 112.53 119.53 123.41 Yes Seasonal
fluctuations
M76 single 126.70 117.61 115.27 123.41 113.41 120.41 124.16 Yes Seasonal
fluctuations
M82-2 single 122.33 117.33 114.33 121.13 111.13 118.13 122.34 Yes Not a lot of data; very fast recovery
during slug test
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Ground Elevation
Screen Top
Screen Bottom
BR Elev
BR-10m
BR-3m
Groundwater Elevation Monitor Type
(masl) (masl) (masl) (masl) (masl) (masl) (masl)
Suitable Notes
M87-1 single 125.40 114.00 111.00 117.78 107.78 114.78 124.32 Yes Weeks to recover but water level
stable for ~2 years
M88-1 single 128.96 113.56 110.56 117.86 107.86 114.86 125.05 Yes Slow recovery
(2005-06) but water level stable since
M89-1 single 131.67 114.07 111.27 121.31 111.31 118.31 111.79 No Non responsive
M99-1 single 130.49 114.34 111.29 120.74 110.74 117.74 DRY No No recovery (dry)
OW1 single 122.96 117.71 117.21 122.66 112.66 119.66 122.86 Yes Seasonal fluctuations
OW4 single 123.96 118.71 118.21 122.36 112.36 119.36 123.25 Yes Seasonal fluctuations
OW37-d single 121.61 112.66 111.86 120.11 110.11 117.11 122.08 Yes
OW54-i multilevel 124.82 116.57 112.67 121.82 111.82 118.82 119.40 No Suspect Integrity
OW55-i multilevel 125.12 117.87 112.87 122.42 112.42 119.42 122.96 No Suspect Integrity
OW56-i multilevel 123.94 116.24 111.69 122.42 112.42 119.42 123.13 No Suspect Integrity
OW57 single 130.00 110.45 109.40 120.21 110.21 117.21 129.17 Yes Seasonal fluctuations
CEM
ETER
Y
240m EASTRESID ENCE
127.5
H
H
H
127.5
127.5
130
125
125.0
125
125.0
125.0
127.5
127.5
127.5
125.0
122.5
125.0125.0
125.0
125.0
122.5
125.0
125.0
127.5125.0
130.
0
135.0
127.5
130.
0
130.0
127.5
127.5135.0
130.0
132.5
130.0
132.5132.5 137.5
140.0
127.5127.5
130.0127.5
125.0
125.0
127.5
137.5
135.0130.0
125.0
122.5
120.0
122.5
122.5
127.5
127.5
130.0
127.5
122.5
MARYSVILLE CREEK
MARYSVILLE CREEK
152.5150.0
147.5145.0
142.5140.0
137.5135.0
132.5130.0
127.5
125.0
126.0
129.0
129.0
127.5
126.0
125.0
126.0
124.0
123.0
123.0
124.0
155.0
157.5160.0
155.0
130.0132.5
135.0137.5
140.0142.5
145.0147.5
150.0152.5
127.5
124.0
130.
0
130.
0 130.
0
130.
0
132.5
130.
0
EXISTING LANDFILL MOUND
VACANTRESIDENCE
LINEDLAGOON
STMW TRPONDSTMW TR
POND
COMPOSTPOND
COMPOSTAREA
STMWTR
POND
TRIBUTARY OFMARYSVILLE CREEK
TO 401
OFFICE
MAINTENANCEBUILDING
SCALE
SOIL
PAD
EMPY HILL UNITED CHURCH
HYDRO ACCESS ROAD
TRIBUTARYMARYSVILLE CREEK
TRIBUTARYMARYSVILLE CREEK
125.0
130.0
130.0
130.0
125.0
125.0
130.0
130.0
125.0
124
124
125
125126
126127
127
128
128
123
123
124
124
129
129
123
123
OW57129.17
OW4123.25
OW37-d122.08
OW1122.86
M88-1125.05 M87-1
124.32
M82-2122.34
M76124.16
M75123.41
M74122.97
M68-3123.91
M6-3123.43
M60-3124.34
M58-3122.45
M56-2122.45
M54-3123.35
M5-3123.33
M52-3124.53
M51-2124.29
M50-3124.24
M46-2123.33
M4-3123.36
M3A-3124.48
OW56-i123.13
OW55-i122.96
OW54-i119.4
M99-1
M9-3119.71
M89-1111.79
M70-2121.1
M59-4122.44
M49-2119.64
M48-2122.41
M47-1123.67
M10-3120.89
M10-2125.11
OW56-sOW56-i
OW55-s
OW55-i
OW54-s
OW54-i
M104M103
M102
M101
M100
M99-2
M98
M97
M96
M95-2
M94-2
M91-2
M89-2M89-1
M88-2M87-2
M86
M85
M84
M83
M81
M80-2
M79
M78
M77
M70-2
M68-4
M67-2M67-1 M66-2
M66-1
M65-2 M65-1
M60-4M59-4
M58-4
M55-4
M54-4M53-4
M51-3
M49-3M49-2
M48-3M48-2
M47-3M47-1
M41
M38
M35
M31 M30M29
M28M27
M23
M19
M16
M14M12
M10-3
M10-2
M9-3
M93124.84
M63-2121.17
M90-2
M61-4
WASTE MANAGEMENTRICHMOND LANDFILLFigure 1:Groundwater Elevations in 3-10 m below bedrock zoneOctober 2008
Hydro TowerContour Lines
0 25 50 75 10012.5Meters
Scale: 1:5000
Project : K-B5691-6Data Source: WM Canada, WESA, HPA Ltd.Date: December 9, 2008
Prepared by:WESA GeomaticsUnits:UTM NAD 83 Zone 18
LEGEND
M81124.55
Shallow Groundwater Monitor (3-10 m below bedrock) not used for contouringGroundwater Elevation (masl)
M52-3 Shallow Groundwater Monitor (overburden or upper 3 m below bedrock)
M81124.55
Shallow Groundwater Monitor (3-10 m below bedrock) suitable for contouringGroundwater Elevation (masl)
DRY
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