TOWNSHIP OF NORTH GLENGARRY MAXVILLE COMMUNAL SEWAGE LAGOONS 2011 GROUNDWATER AND SURFACE WATER MONITORING PROGRAM REF.: FINAL REPORT

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1 2011 Groundwater and Surface Water Monitoring Program FINAL REPORT TOWNSHIP OF NORTH GLENGARRY MAXVILLE COMMUNAL SEWAGE LAGOONS 2011 GROUNDWATER AND SURFACE WATER MONITORING PROGRAM REF.: Submitted: March 23, 2012 Prepared by: SNC-Lavalin Environment Ottawa, Ontario Ref.: i March 2012

2 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON EXECUTIVE SUMMARY SNC-Lavalin Environment, Division of SNC-Lavalin Inc. was retained by the Township of North Glengarry to complete the groundwater and surface water monitoring program at the Maxville Communal Sewage Lagoons in 2011 and to prepare the annual monitoring report for the site in accordance with the site s Certificate of Approval No GNPH5. The Maxville sewage lagoons are located on Part Lots 11 and 12, Concessions 19 and 20, in the Township of North Glengarry, approximately 4 km northwest of the Village of Maxville, Ontario. The scope of work for the 2011 monitoring and sampling program included measurement of water levels in all twelve (12) existing monitoring wells in the spring and fall; collection of groundwater samples from nine (9) monitoring wells in the spring; collection of surface water samples from three (3) locations in the adjacent West Branch of the Scotch River in the spring, summer and fall; and, collection of one (1) surface water sample from the eastern cell of the sewage lagoons in the spring, summer and fall. Analytical results from the surface water samples collected in 2011 indicate that operations at the sewage lagoons do not appear to have significantly impacted surface water quality in the adjacent West Branch of the Scotch River. Concentrations of all parameters at the furthest downstream surface water sample location (SW-3) were comparable to concentrations reported in the upstream sample location (SW-1). One anomalously elevated concentration of total phosphorus was measured at SW-2 (adjacent to the site) during the summer round, however concentrations returned to normal levels during the subsequent round. Groundwater samples collected from nine (9) monitoring wells in the spring of 2011 satisfied ODWS for chloride, nitrate and nitrite. Groundwater samples collected from the downgradient point of compliance well BH03-2A/B should also satisfy RUC criteria calculated for the site in order to comply with MOE Guideline B-7. In Spring 2011, the chloride concentration measured in downgradient bedrock interval BH03-2A (159 mg/l) and MW10-BR (210 mg/l) exceeded the RUC criteria of 149 mg/l. In addition the chloride concentration at downgradient overburden monitoring well MW10-M (189 mg/l) exceeded the RUC criteria. Historical data from these wells indicates that the chloride concentrations have typically exceeded the RUC criteria established for the site. Although concentrations of other parameters at BH03-2A and MW10-BR/M are relatively similar or slightly above background levels, the elevated chloride concentrations suggest that there may be some impact from the lagoons on the bedrock groundwater quality downgradient from the site. While the groundwater results from BH03-2A suggest that the site may not be in compliance with MOE Guideline B-7, there are no potable water users within the Ref.: i March 2012

3 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON area immediately downgradient of the site and there was no evidence to suggest that there has been any significant impact to surface water in the adjacent West Branch of the Scotch River. The groundwater and surface water monitoring program at the Maxville sewage lagoons will be continued in 2012 as per the Certificate of Approval requirements. It is also recommended that the lagoon water sampling program be continued in conjunction with the surface water sampling program in the spring, summer and fall. Ref.: ii March 2012

4 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON TABLE OF CONTENTS 1. INTRODUCTION Scope of Work Report Structure BACKGROUND Site Description Certificate of Approval Previous Site Investigations Site Geology METHODOLOGY Water Level Monitoring Groundwater Sampling Surface Water Sampling Sewage Lagoon Sampling Regulatory Criteria Groundwater Criteria Surface Water Criteria FINDINGS AND RESULTS Water Level Monitoring Overburden Monitoring Wells Bedrock Monitoring Wells Groundwater Analytical Results Background Groundwater Quality Overburden Groundwater Quality Bedrock Groundwater Quality Surface Water Analytical Results Upstream Surface Water Quality Downstream Surface Water Quality Lagoon Water Analytical Results SUMMARY AND RECOMMENDATIONS Summary Recommendations DISCLAIMER REFERENCES Ref.: iii March 2012

5 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON LIST OF FIGURES Figure 1 Figure 2 Figure 3 Figure 4.1 Figure 4.2 Figure 5.1 Figure 5.2 Site Location Site Layout Surface Water Sampling Locations Interpreted Horizontal Groundwater Flow Direction in Overburden (May 9, 2011) Interpreted Horizontal Groundwater Flow Direction in Overburden (October 14, 2011) Interpreted Horizontal Groundwater Flow Direction in Bedrock (May 9, 2011) Interpreted Horizontal Groundwater Flow Direction in Bedrock (October 14, 2011) LIST OF TABLES Table 1 Table 2 Table 3 Table 4 Water Level Monitoring Summary Groundwater Analytical Results Surface Water Analytical Results Lagoon Water Analytical Results LIST OF APPENDICES Appendix A Appendix B Appendix C Certificate of Approval No GNPH5 Laboratory Certificates of Analysis - Groundwater Laboratory Certificates of Analysis - Surface Water and Lagoon Samples Ref.: iv March 2012

6 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 1. INTRODUCTION SNC-Lavalin Environment, Division of SNC-Lavalin Inc. (SLE) was retained by the Township of North Glengarry (the Township) to complete groundwater and surface water monitoring at the Maxville Communal Sewage Lagoons in 2011 and to prepare the annual monitoring report in accordance with the site s Certificate of Approval No GNPH5. The Maxville sewage lagoons are located on Part Lots 11 and 12, Concessions 19 and 20, in the Township of North Glengarry, approximately 4 km northwest of the Village of Maxville, Ontario (refer to Figure 1). This report documents the methodology and results of the monitoring and sampling program conducted at the site in Scope of Work SLE was retained by the Township to complete the following tasks at the site in 2011: Conduct the annual groundwater and surface water monitoring program at the Maxville sewage lagoons in accordance with the Certificate of Approval issued for the site; Continue collection of water samples from the lagoon to characterize water quality in the lagoons; Document the results of the monitoring and sampling program completed in 2011 and assess compliance with the applicable provincial criteria and guidelines; and, Determine the need to implement remedial measures or contingency plans based on results of the monitoring and sampling program. The scope of work for the monitoring and sampling program included the following: Measurement of water levels in all twelve (12) existing monitoring wells on a semiannual basis (spring and fall); Collection of groundwater samples from nine (9) monitoring wells annually (spring) for laboratory analysis of indicator parameters specified in the site s Certificate of Approval; Collection of surface water samples from three (3) locations in the adjacent West Branch of the Scotch River three (3) times per year (spring, summer and fall) for laboratory analysis of indicator parameters specified in the site s Certificate of Approval; and, Collection of a water sample from the eastern cell of the sewage lagoons (Cell 2) three (3) times per year (spring, summer and fall). Ref.: March 2012

7 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 1.2 Report Structure Background information regarding the site is detailed in Section 2. The methodology for the monitoring and sampling programs conducted in 2011 is documented in Section 3 of this report, while analytical results are presented in Section 4. Summary and recommendations for future work are discussed in Section 5. A disclaimer and references are provided in Sections 6 and 7, respectively. Ref.: March 2012

8 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 2. BACKGROUND 2.1 Site Description The Maxville sewage lagoons are located on Part Lots 11 and 12, Concessions 19 and 20, in the Township of North Glengarry, approximately 4 km northwest of the village of Maxville, Ontario (refer to Figure 1). The sewage lagoons are accessible via a gravel surfaced laneway off of the south side of Athol Road, approximately 850 m west of Highland Road (also known as County Road 20). The communal sewage system was constructed in 1989 and consists of a sanitary sewer collection system, pumping stations and two sewage lagoons arranged in parallel (referred to as Cell 1 and 2). The layout of the site and the approximate site perimeter are shown in Figure 2. The two cells of the lagoon have a total surface area of 9.75 hectares, an operating depth of 1.8 m, and an operating volume of 164,025 m 3. Effluent from the sewage lagoons is discharged through a discharge chamber and outlet pipe to the lagoon drain located along the north side of the lagoons. The drain discharges in a northeast direction into the West Branch of the Scotch River, approximately 20 m east of the site perimeter. 2.2 Certificate of Approval The current amended Certificate of Approval for a Municipal and Private Sewage Works No GNPH5 was issued for the site on July 22, 2008 (refer to Appendix A). The municipal sewage works is described as having a rated capacity of 450 m 3 per day, serving the Village of Maxville through the collection, transmission, treatment and subsequent disposal of sanitary sewage to the West Branch of the Scotch River. The amended Certificate of Approval allows for repairs and alterations to the berms surrounding the two lagoon cells. The amended Certificate of Approval also outlines the conditions for the operation and maintenance of the sewage works, including effluent objectives and limits, procedures for the annual effluent discharge, and the monitoring program requirements for the operation of the lagoons (raw sewage, lagoon pre-discharge and final effluent). The requirements for the groundwater and surface water monitoring and sampling programs are stipulated in Tables 6 and 7 of Condition 9(3) of the amended Certificate of Approval. Monitoring data collected as part of the groundwater and surface water monitoring programs are required to be reported to the Ontario Ministry of the Environment (MOE) on an annual basis as outlined in Condition 10(4). Ref.: March 2012

9 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 2.3 Previous Site Investigations A number of investigations have previously been conducted at the site, as summarized in the 2010 monitoring report prepared by SNC-Lavalin Environment (SLE, 2011). Prior to the construction of the sewage lagoons, nine (9) monitoring wells (P1 to P9) were installed within the proposed area of the lagoons. In 1993, only five (5) of the nine (9) original wells were still present (P1, P2, P3, P7 and P8). P3 was noted to have been destroyed in July Monitoring well P8 could not be located during the works programs in 2009, 2010 and A multi-level monitoring well (MW10) consisting of three (3) intervals (two screened in overburden, MW10-S and MW10-M; one in bedrock, MW10-BR) was installed along the east side of the lagoons in Monitoring wells BH03-1 and BH03-2 were installed at the site in May 2003, each consisting of a shallow interval (B) installed in the overburden and a deeper interval (A) installed in the bedrock. Shallow monitoring well BH03-1B was noted to be damaged in the spring of 2007 and was replaced in October 2007 with a similarly constructed well identified as BH07-3. In July 2008, a new background monitoring well (BH08-1) was installed approximately 500 m northwest of the sewage lagoons, at the intersection of Athol Road and the site access road. The new monitoring well was installed to characterize background groundwater quality in the vicinity of the site. The background well consists of a shallow interval installed in the overburden (BH08-1B) and a deeper interval installed in the bedrock (BH08-1A). The annual groundwater and surface water sampling programs were reportedly initiated in 1993, and were most recently conducted by Golder from 2002 to 2008 (Golder, 2009) and SLE in 2009 (SLE, 2010) and 2010 (SLE, 2011). 2.4 Site Geology Surficial geology in the vicinity of the site reportedly consists of marine deep water sediments comprised of clay, overlain in some areas by Fort Covington till consisting of cobbley to bouldery sandy silty till (Golder, 2009). Bedrock in the site area reportedly consists of shaley limestone of the Ottawa Formation (Golder, 2009). Based on information in the available borehole logs for monitoring wells and geotechnical boreholes drilled at the site, the surficial geology of the site is comprised of 1 to 4 m of silty clay Ref.: March 2012

10 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON or sandy silt, underlain by a 2 to 5 m layer of silty sand and gravel (glacial till). Bedrock consists of black shale intersected at depths of 4.5 to 6.9 m below ground surface (mbgs). Ref.: March 2012

11 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 3. METHODOLOGY 3.1 Water Level Monitoring Twelve (12) monitoring wells were monitored at the Maxville sewage lagoons on a semi-annual basis in Spring and Fall The monitoring program included monitoring wells P1, P2, P7, BH03-1A/BH07-3, BH03-2A/B, BH08-1A/B and MW-10S/M/BR. At the multi-level or nested well installations, the suffix A denotes the deep bedrock interval and B the shallow overburden interval, with the exception of MW-10, where the identifiers S and M denote the shallow and medium overburden intervals, respectively, and the BR denotes the deep bedrock interval. Locations of the groundwater monitoring wells at the site are shown in Figure 2. Table 3.1 provides a summary of existing monitoring wells included in the monitoring program at the Maxville sewage lagoons. Table 3.1 Monitoring Well Summary Well Type Monitoring Well ID Screened Unit Well Depth (mbgs) Background Monitoring Wells (upgradient from site) BH08-1A Bedrock (shale) 7.6 mbgs BH08-1B Glacial Till 4.6 mbgs Overburden Monitoring Wells P1, P2, P7, BH07-3, BH03-2B, MW-10S and MW-10M Silty Clay or Glacial Till 3.1 mbgs at MW-10S to 7.7 mbgs at MW-10M Bedrock Monitoring Wells BH03-1A, BH03-2A and MW-10BR Bedrock (shale) 7.6 mbgs at BH03-1A to 12.6 mbgs at MW-10BR In 2011, monitoring well water levels were measured on May 9 (Spring 2011) and October 14 (Fall 2011). The water level in each monitoring well was measured using an electronic water level tape and referenced to the top of the PVC riser pipe. Water levels were measured prior to purging and sampling of the wells. 3.2 Groundwater Sampling As part of the groundwater sampling program for the Maxville sewage lagoons, groundwater samples were collected from nine (9) monitoring wells (BH03-1A, BH07-3, BH03-2A/B, BH08-1A/B, MW10-BR/M/S) in the spring. groundwater sampling was completed on May Prior to sampling, each well was purged dry three times or purged of 100 L of groundwater using dedicated inertial samplers and polyethylene tubing. Temperature, ph and conductivity Ref.: March 2012

12 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON were measured in the field at the time of sampling using a Hanna ph/ec/tds/ºc tester (Model HI 98130) which was calibrated in the field using manufacturer supplied ph and conductivity solutions. All groundwater samples were collected in laboratory prepared sampling containers, stored in a cooler on ice and delivered to the laboratory for analysis. Laboratory analysis in 2011 was completed by Exova Accutest of Ottawa, Ontario. Groundwater samples collected in Spring 2011 were analysed for the parameters outlined in Condition 9(3), Table 6 of the Certificate of Approval, which includes carbonaceous biochemical oxygen demand (BOD), chloride, chemical oxygen demand (COD), dissolved reactive phosphorus (DRP), nitrate, nitrite, total ammonia, total kjeldahl nitrogen (TKN) and total phosphorus. The parameter list was consistent with the groundwater sampling program conducted in 2010 (SLE, 2011). 3.3 Surface Water Sampling Surface water sampling in the adjacent West Branch of the Scotch River was completed three (3) times per year at the Maxville sewage lagoons (spring, summer and fall). Surface water sampling was completed on May 6, August 9 and October 13, Surface water sampling locations are shown in Figure 3. Table 3.3 provides a description of the surface water sampling locations. Table 3.3 Surface Water Sampling Locations Sample ID Sampling Location Description SW-1 Off-site - upgradient Collected from the West Branch of the Scotch River, approximately 600 m south of the site, along the north side of Kenyon Concession 19 Road SW-2 Off-site adjacent Collected from the West Branch of the Scotch River, adjacent to the eastern perimeter of the site SW-3 Off-site - downgradient Collected from the West Branch of the Scotch River, approximately 480 m north of the site, along the south side of Athol Road Dissolved oxygen (DO), temperature, ph and conductivity were measured in the field at each surface water sample location at the time of sampling. DO concentrations were measured using an YSI 550A dissolved oxygen meter. Temperature, ph and conductivity were measured using a Hanna ph/ec/tds/ºc tester (Model HI 98130) calibrated in the field prior to each sampling event using manufacturer supplied ph and conductivity solutions. Ref.: March 2012

13 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON All surface water samples were collected as grab samples into laboratory prepared sampling containers, stored in a cooler on ice and delivered to the laboratory for analysis. Laboratory analysis in 2011 was completed by Exova Accutest of Ottawa, Ontario. Surface water samples collected in 2011 were analysed for the parameters outlined in Condition 9(3), Table 7 of the Certificate of Approval, which includes BOD, chloride, COD, DRP, nitrate, nitrite, total ammonia, total dissolved solids (TDS), TKN, total phosphorus, and total suspended solids (TSS). The parameter list was consistent with the previous surface water sampling program conducted in 2009 (SLE, 2011). 3.4 Sewage Lagoon Sampling As recommended in the 2009 annual report (SLE, 2010), the 2011 monitoring program for the site included collection of samples from the eastern cell of the sewage lagoons (Cell 2) as part of the Spring, Summer and Fall sampling events. Sampling of the lagoon water was completed on May 6 (Spring), August 9 (Summer) and October 13, 2011 (Fall). The lagoon sample location is shown in Figures 2 and 3 (identified as East Pond ). The procedure for the lagoon water sampling program was consistent with the methodology for the surface water sampling program as described in Section 3.3. Dissolved oxygen (DO), temperature, ph and conductivity were measured in the field at the time of sampling. The lagoon water samples were collected as grab samples into laboratory prepared sampling containers, stored in a cooler on ice and delivered to Exova Accutest of Ottawa, Ontario for analysis. The lagoon water samples were analysed for the same parameter list as the surface water sampling program. 3.5 Regulatory Criteria Groundwater Criteria Groundwater analytical results are compared to the MOE s Ontario Drinking Water Standards (ODWS) (MOE, 2003). In addition, MOE Guideline B-7 and Procedure B-7-1 (MOEE, 1994a and 1994b) establishes the basis for reasonable use of groundwater on properties adjacent to contaminant sources and the procedures for evaluating the level of contaminant discharges acceptable by the MOE. Groundwater at or within the licensed property boundary, as established in designated point of Ref.: March 2012

14 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON compliance wells, must meet the Reasonable Use Concept (RUC) criteria calculated following the procedure outlined in Procedure B-7-1. In areas of potable groundwater use, water quality cannot be degraded by more than fifty percent of the difference between the background and ODWS for non-health related parameters, and by twenty-five percent for health related parameters. Of the parameters analysed as part of the groundwater monitoring program at the Maxville sewage lagoons, ODWS have only been established for chloride, nitrate and nitrite. Therefore, RUC criteria can only be calculated for these three parameters to determine compliance at the site. At the Maxville sewage lagoons, background water quality is established at monitoring wells BH08-1A/B, located approximately 500 m northwest of the site, at the entrance to the site access road from Athol Road. Monitoring wells BH03-2A/B, located in the northeast portion of the site, have been designated as the point of compliance wells for the site to be evaluated against the RUC criteria calculated for the site Surface Water Criteria Surface water analytical results are compared to the Provincial Water Quality Objectives (PWQO) (MOEE, 1994d). Surface water analytical results are also monitored for dramatic changes in water quality, regular exceedances of PWQOs and statistically significant long term trends. For discussion purposes, analytical results from the lagoon water samples were also compared to the PWQO. The results were also used to characterize the lagoon effluent for use in evaluating potential impacts to groundwater and surface water in the vicinity of the site. Ref.: March 2012

15 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 4. FINDINGS AND RESULTS 4.1 Water Level Monitoring Twelve (12) monitoring wells were monitored at the Maxville sewage lagoons on May 9 (Spring 2011) and October 14, 2011 (Fall 2011). Water levels measured in 2011 are presented in Table 1. Table 1 also includes historical water levels measured at the Maxville sewage lagoons from 2007 to Overburden Monitoring Wells Water level data collected during the Spring 2011 monitoring event indicates that the depth to groundwater in the monitoring wells installed in overburden (P1, P2, P7, MW10-S, MW10-M, BH07-3, BH03-2B and BH08-1B) ranged from 1.34 metres below the top of the PVC riser (m BTR) to 3.12 m BTR, resulting in groundwater elevations between metres above sea level (m ASL) at BH03-2B to m ASL at BH08-1B. During the Fall 2011 monitoring event, water levels in the shallow completion wells ranged from 1.52 to 3.25 m BTR. Groundwater elevations ranged between m ASL at BH03-2B to m ASL at BH08-1B. Based on the groundwater elevations measured during the monitoring events in 2011, shallow groundwater flow across the site in the overburden is generally to the northeast and is consistent with historical groundwater flow at the site (SLE, 2011). The interpreted groundwater flow direction in the overburden during the Spring and Fall 2011 monitoring events is shown in Figures 4.1 and 4.2, respectively. Using the water level data from the Spring and Fall 2011 monitoring events, the horizontal hydraulic gradients for shallow groundwater flow across the north portion of the sewage lagoons between monitoring wells BH07-3 and BH03-2B were calculated to be in Spring and in Fall Bedrock Monitoring Wells The depth to groundwater in the monitoring wells installed in bedrock (MW10-BR, BH03-1A, BH03-2A and BH08-1A) during the Spring 2011 monitoring event ranged from 1.82 to 3.08 m BTR. Relative groundwater elevations ranged from m ASL at BH03-2A to m ASL at BH08-1A. Ref.: March 2012

16 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON During the Fall 2011 monitoring event, water levels in the bedrock wells ranged from 1.82 to 3.20 m BTR. Relative groundwater elevations ranged from m ASL at BH03-2A to m ASL at BH08-1A. Based on the groundwater elevations measured during the 2011 monitoring events, groundwater flow across the site in the shallow bedrock is generally to the northeast and is consistent with historical groundwater flow at the site (SLE, 2011). The interpreted groundwater flow direction in the bedrock during the Spring and Fall 2011 monitoring events are shown in Figure 5.1 and 5.2 respectively. Using the water level data from the 2011 monitoring events, the horizontal hydraulic gradients for groundwater flow across the north portion of the sewage lagoons between bedrock monitoring wells BH03-1A and BH03-2A was calculated to be in Spring and in Fall. 4.2 Groundwater Analytical Results As part of the groundwater sampling program for the Maxville sewage lagoons, groundwater samples were collected from nine (9) monitoring wells (BH03-1A, BH07-3, BH03-2A/B, BH08-1A/B and MW10-BR/M/S) on May 9, Groundwater analytical results for samples collected in 2011 and applicable ODWS and RUC criteria are summarized in Table 2. Historical groundwater analytical results are also included in Table 2. Laboratory certificates of analysis are provided in Appendix B Background Groundwater Quality Monitoring wells BH08-1A/B are located approximately 500 m northwest of the sewage lagoons, at the intersection of Athol Road and the site access road, and are indicative of background groundwater quality in the vicinity of the site. The monitoring wells were installed in July 2008 and replaced monitoring wells BH03-1A and BH07-3 as the designated background monitoring wells for the site. The background well consists of a shallow interval (BH08-1B) installed in the overburden (glacial till) at a depth of 4.6 mbgs, and a deeper interval (BH08-1A) installed in bedrock at a depth of 7.6 mbgs. Background monitoring wells BH08-1A/B are sampled annually as part of the spring monitoring and sampling event and the groundwater analytical results are used to calculate the RUC criteria for the site. Ref.: March 2012

17 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON The new background monitoring wells have been sampled five (5) times since they were installed in July Analytical data gathered to date indicates that there has been some variability in the concentrations of certain parameters in the background wells, particularly COD, TKN and DRP. Concentrations of these parameters were significantly elevated during the first sampling event in the summer of 2008, and have shown a decreasing trend over the subsequent four (4) sampling events. It is possible that the initial elevated concentrations could be attributed to the installation of the background wells, as recent sampling events indicate that concentrations of COD, TKN and DRP appear to have stabilized at lower concentrations. Although there has been some variability in parameter concentrations measured at the new background wells, concentrations of chloride, nitrate and nitrite in both intervals remained fairly stable over the five sampling events. Chloride concentrations ranged from 33 to 39 mg/l in the shallow overburden interval, and from 38 to 67 mg/l in the deeper bedrock interval, while nitrate and nitrite concentrations were typically below laboratory detection limits in both intervals. As a result, median concentrations of these parameters are inferred to be representative of background groundwater quality in the vicinity of the site, and are therefore suitable for use in calculating RUC criteria for the site Overburden Groundwater Quality Monitoring wells BH07-3, MW10-S/M and BH03-2B are completed in overburden (silty clay and/or glacial till) at depths ranging from 3.1 to 7.7 mbgs. All four wells are sampled annually in the spring as part of the groundwater monitoring program at the site. Monitoring well BH07-3 is located approximately 100 m northwest of the lagoons and is inferred to be upgradient of the sewage lagoons, while BH03-2B and MW10-S/M are located approximately 80 m northeast and 12.5 m east of the sewage lagoon respectively and inferred to be downgradient. Groundwater samples collected from BH07-3 and BH03-2B satisfied ODWS for chloride, nitrate and nitrite. Groundwater at the shallow point of compliance well BH03-2B also satisfied the RUC criteria calculated for the site. However, the concentration of chloride exceeded the RUC criteria in monitoring well MW10-M (189 mg/l) but not in MW10-S. MW10-M is screened from approximately 3.6 mbgs to 6.6 m mbgs which is deeper than the other overburden monitoring wells at the site. Historical groundwater elevations and chemistry in MW10-M have also been similar to MW10-BR, which is screened in bedrock, suggesting that this well is more representative of groundwater flowing through the bedrock than the overburden. Shallow groundwater in the upgradient well BH07-3 does not appear to be significantly affected by the lagoon operations. Ref.: March 2012

18 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON In general, parameter concentrations in the overburden monitoring wells in Spring 2011 were within historical concentration ranges and there were no significant variations in concentrations of the analysed parameters with one exception. COD in MW-10-S was detected at 400 mg/l in MW-10-S. The COD concentration in 2010 (when it was installed) was 13 mg/l. There is insufficient data to interpret any trends in COD concentrations in this well Bedrock Groundwater Quality Monitoring wells BH03-1A, BH03-2A and MW10-BR are completed in bedrock at depths ranging from 7.6 to 12.6 mbgs and are sampled annually in the spring as part of the groundwater monitoring program at the site. Monitoring well BH03-1A is located approximately 100 m northwest of the lagoons and is inferred to be upgradient of the sewage lagoons, while BH03-2A and MW10-BR are located approximately 80 m northeast and 12.5 m east of the sewage lagoon respectively and inferred to be downgradient. The groundwater sample collected from BH03-1A in Spring 2011 satisfied the ODWS and RUC for chloride, nitrate and nitrite. Furthermore analysed parameters were generally similar to background concentrations at BH08-1A. It appears that the site operations have not caused a significant impact to groundwater in the bedrock northwest of the lagoons. Groundwater samples collected from BH03-2A and MW10-BR satisfied ODWS nitrate and nitrite standards. Although the groundwater samples collected from BH03-2A and MW10-BR satisfied ODWS chloride standards, the chloride concentration at monitoring wells BH03-2A (159 mg/l) and MW10-BR (210 mg/l) exceeded the RUC criteria of 149 mg/l. Historical data indicates that the chloride concentrations in these wells have remained fairly stable since at least Chloride concentrations at BH03-2A and MW10-BR are typically three to five times higher than background concentrations at BH08-1A (38 to 67 mg/l). The elevated chloride concentrations in these two wells suggest that there may be some impact from the lagoons on the bedrock groundwater quality downgradient from the site. 4.3 Surface Water Analytical Results Surface water sampling was completed three (3) times in 2011 in Spring, Summer and Fall. Analytical results for surface water samples collected in 2011 and applicable PWQO are summarized in Table 3. Historical surface water analytical results are also included in Table 3. Laboratory certificates of analysis are provided in Appendix C. Ref.: March 2012

19 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON Upstream Surface Water Quality Upstream surface water quality is represented by surface water sample location SW-1, which is collected from the West Branch of the Scotch River, approximately 600 m south (i.e. upstream) of the site on the north side of Kenyon Concession 19 Road. The following provides a summary of PWQO exceedances in the upgradient surface water samples collected at SW-1 in 2011: The field measured ph level in the sample collected in October 2011 (8.68) exceeded the PWQO criteria range of 6.5 to 8.5; and, The total phosphorus concentration in the sample collected in August 2011 (0.04 mg/l) marginally exceeded the PWQO of 0.03 mg/l. Given the distance between the upstream collection point for SW-1 and the sewage lagoons, it is unlikely that surface water quality at this upgradient location is influenced by operations at the site. The periodic elevated concentrations of total phosphorus identified at SW-1 are likely indicative of natural surface water quality in the area. The ph measured during the Fall 2011 sampling event (8.68) exceeded the PWQO. This is generally consistent with other ph measurements recorded at this location. Parameter concentrations at SW-1 in 2011 were generally consistent with historical levels identified at the upstream sample location Downstream Surface Water Quality Downstream surface water samples SW-2 and SW-3 are collected from the West Branch of the Scotch River. SW-2 is collected immediately adjacent to the site, while SW-3 is collected approximately 480 m downstream of the site, on the south side of Athol Road. The following provides a summary of PWQO exceedances in samples collected from the downstream surface water sample locations in 2011: Total phosphorous concentrations exceeded the PWQO of 0.03 mg/l in samples collected at SW-2 in Spring, Summer and Fall 2011 and at SW-3 in Summer 2011; and, The field measured ph levels slightly exceeded the PWQO criteria range of 6.5 to 8.5 in the sample collected at SW-2 in Fall 2011 and at SW-3 in Spring Total phosphorus concentrations measured at SW-2 (adjacent to the site) during Spring and Fall are generally consistent with background concentrations, with one exception. The total phosphorus concentration measured during the summer round (0.61 mg/l) was elevated anomalously, however returned to normal concentrations during the subsequent round. Ref.: March 2012

20 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON Analytical results for the surface water samples collected at downstream location SW-3 in 2011 indicate that operations at the sewage lagoons do not appear to have impacted surface water quality in the West Branch of the Scotch River. Concentrations of all parameters at this downstream surface water sample location were comparable to the concentrations reported in the upstream sample location SW-1, including the periodic elevated concentrations of total phosphorus. Parameter concentrations at the downstream sample locations in 2011 were also comparable to historical levels measured between 2003 and Lagoon Water Analytical Results Water samples were collected from the eastern cell of the lagoons three (3) times in 2011 in the spring, summer and fall. Current and historical analytical results for lagoon water samples are summarized in Table 4. Although PWQO are not applicable to water samples collected from the lagoons, the criteria have been included in Table 4 for comparison purposes. Laboratory certificates of analysis are provided in Appendix C. The following provides a summary of PWQO exceedances in the lagoon water samples collected in 2011: Total phosphorus concentrations in the samples collected in Spring, Summer and Fall 2011 ( mg/l) exceeded the PWQO of 0.03 mg/l; The un-ionized ammonia concentration in samples collected in Summer (0.043 mg/l) and Fall (0.064 mg/l) 2011 exceeded the PWQO of 0.02 mg/l; and, The field measured ph in the samples collected in Spring, Summer and Fall 2011 ( mg/l) exceeded the PWQO criteria range of 6.5 to 8.5. Results from the current and historical samples collected from the eastern cell of the lagoon confirm that water quality in the lagoons is characterized by elevated concentrations of several parameters, including chloride ( mg/l), total phosphorus ( mg/l), TDS ( mg/l) and unionized ammonia (< ). Concentrations reported in 2011 were generally consistent with results from previous sampling events from 2007 to Concentrations of COD, ammonia and TKN in samples collected in 2011 were consistent with previous years. Ref.: March 2012

21 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 5. SUMMARY AND RECOMMENDATIONS 5.1 Summary Groundwater and surface water monitoring and sampling was conducted at the Maxville Communal Sewage Lagoons in 2011 in accordance with the site s Certificate of Approval No GNPH5. The scope of work for the monitoring and sampling program included measurement of water levels in all twelve (12) existing monitoring wells on a semi-annual basis in the spring and fall; collection of groundwater samples from nine (9) monitoring wells annually in the spring; collection of surface water samples from three (3) locations in the adjacent West Branch of the Scotch River three (3) times per year in the spring, summer and fall; and, collection of a water sample from the eastern cell of the sewage lagoons three (3) times per year in the spring, summer and fall. Analytical results from the surface water sampling program conducted in 2011 indicate that operations at the sewage lagoons do not appear to have significantly impacted surface water quality in the adjacent West Branch of the Scotch River. Concentrations of all parameters at the furthest downstream surface water sample location (SW-3) were comparable to the concentrations reported in the upstream sample location (SW-1). Parameters which were noted to be present at elevated concentrations in the water samples collected from the lagoon were present at significantly lower concentrations in the upstream and downstream surface water locations. Groundwater elevations measured during the monitoring events in 2011 indicate that groundwater flow in both the overburden and bedrock is generally to the northeast and is consistent with historical groundwater flows at the site (SLE, 2011). Groundwater samples collected from nine (9) monitoring wells in the spring of 2011 satisfied ODWS for chloride, nitrate and nitrite. However, groundwater samples collected from the downgradient point of compliance well BH03-2A/B should also satisfy RUC criteria calculated for the site in order to comply with MOE Guideline B-7. In Spring 2011, the chloride concentration measured in downgradient bedrock interval BH03-2A (159 mg/l) and MW10-BR (210 mg/l) exceeded the RUC criteria of 149 mg/l. In addition the chloride concentration in downgradient overburden monitoring well MW10-M (189 mg/l) exceeded the RUC criteria. Historical data from these wells indicates that the chloride concentrations have typically exceeded the RUC criteria established for the site. Although concentrations of other parameters at BH03-2A and MW10-BR/M are relatively similar or slightly above background levels, the elevated chloride concentrations suggest that there may be some impact from the lagoons on the bedrock groundwater quality downgradient from the site. While the groundwater Ref.: March 2012

22 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON results from BH03-2A suggest that the site may not be in compliance with MOE Guideline B-7, there are no potable water users within the area immediately downgradient of the site and there is no evidence (based on results of the surface water monitoring program) to suggest that there has been any significant impact to surface water in the adjacent West Branch of the Scotch River. Results from the lagoon water samples collected in 2011 confirm that water quality in the lagoons is characterized by elevated concentrations of several key parameters, including chloride, total phosphorus and TDS. Concentrations reported in 2011 were generally consistent with results from previous sampling events from 2007 to Recommendations Based on the findings of the monitoring and sampling program completed at the Maxville Communal Sewage Lagoons in 2011, the following recommendations are provided: Continue groundwater and surface water monitoring in 2012 as per Certificate of Approval requirements. The monitoring program will include: a) Groundwater Monitoring: Continue to measure water levels in all monitoring wells semi-annually in the spring and fall. Groundwater samples will continue to be collected annually in the spring from monitoring wells BH03-1A/BH07-3, BH03-2A/B, BH08-1A/B and MW-10S/M/BR. The parameter list would be the same as the 2011 sampling program, which is consistent with Table 6 of Condition 9(3) of the amended Certificate of Approval for the site. b) Surface Water and Lagoon Monitoring: Continue to monitor and sample surface water three (3) times per year in the spring, summer and fall at the three (3) established surface water sample locations in the adjacent West Branch of the Scotch River (SW-1, 2 and 3). Continue to collect a water sample from the eastern cell of the sewage lagoon (Cell 2) in conjunction with the surface water sampling program in the spring, summer and fall. Ref.: March 2012

23 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON The parameter list would be the same as the 2011 sampling program, which is consistent with Table 7 of Condition 9(3) of the amended Certificate of Approval for the site. c) Submit a report documenting the 2012 monitoring program by March 31, 2013 in accordance with the Certificate of Approval. Ensure monitoring wells are secure, well identified, and that they are protected from possible damage by equipment, vehicles, etc. Ref.: March 2012

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25 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON 7. REFERENCES Golder Associates Ltd. (Golder), Groundwater and Surface Water Monitoring Program, Maxville Communal Sewage Lagoons, Township of North Glengarry, Ontario. Prepared for the Township of North Glengarry. March Ontario Ministry of Environment and Energy (MOEE), 1994a. Guideline B-7, Incorporation of the Reasonable Use Concept into MOEE Groundwater Management Activities. Formerly April Ontario MOEE, 1994b. Procedure B-7-1, Determination of Contaminant Limits and Attenuation Zones. December Ontario MOEE, 1994c. Guideline B-9, Resolution of Groundwater Interference Problems. Formerly April Ontario MOEE, 1994d. Water Management, Policies, Guidelines, Provincial Water Quality Objectives. July 1994, reprinted February Ontario MOE, Technical Support Document for Ontario Drinking Water Standards, Objectives and Guidelines. June 2003, revised June SNC-Lavalin Environment (SLE), Township of North Glengarrry, Maxville Communal Sewage Lagoons, 2009 Groundwater and Surface Water Monitoring Program. March 24, 2010 SNC-Lavalin Environment (SLE), Township of North Glengarrry, Maxville Communal Sewage Lagoons, 2010 Groundwater and Surface Water Monitoring Program. March 25, 2011 Ref.: March 2012

26 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON FIGURES Ref.: March 2012

27 N HIGHLAND ROAD (COUNTY ROAD 20) HIGHWAY 417 ATHOL ROAD SITE KENYON CONCESSION 19 NOTE(S): 1. SCALE IS APPROXIMATE 2. INFORMATION ON THIS FIGURE MAY BE LOST IF IT IS PHOTOCOPIED, FAXED OR PRINTED FROM PDF 0 SCALE 1:50, m Client/Location: TOWNSHIP OF NORTH GLENGARRY MAXVILLE COMMUNAL SEWAGE LAGOONS NORTH GLENGARRY, ONTARIO Title: SITE LOCATION Project No: Drawn/Design: EM Filename: MAXVILLE-1.CDR Verified: KS Date: Dwg No: MARCH 2012 Project Manager: MRF FIGURE 1

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34 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON TABLES Ref.: March 2012

35 TABLE 1 WATER LEVEL MONITORING SUMMARY Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Top of Ground Approximate 31-May Oct Jun Oct May Oct-09 Well Well Surface Depth of Water Water Water Water Water Water Water Water Riser Elevation Well Level Level Level Level Level Level Level Level Elevation (masl) (mbgs) Elevation Elevation Elevation Elevation Depth Elevation Depth Elevation (m ASL) (m ASL) (m ASL) (m ASL) (m ASL) (m BTR) (m ASL) (m BTR) (m ASL) P P P MW10-S MW10-M dry MW10-BR BH03-1A ns BH ns 4.57 ni BH03-2A ns BH03-2B ns BH08-1A ns 7.62 ni ni ni BH08-1B ns 4.57 ni ni ni Elevations obtained from 2008 Monitoring Report, Table 1 prepared by Golder Associates Ltd. (March 2009) m ASL metres above sea level m BTR metres below top of riser mbgs metres below ground surface ns not surveyed ni not installed dry no groundwater present in monitoring well Ref.: Page 1 of 2

36 TABLE 1 WATER LEVEL MONITORING SUMMARY Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Top of Ground Approximate Well Well Surface Depth of Riser Elevation Well Elevation (masl) (mbgs) (m ASL) P P P MW10-S MW10-M MW10-BR BH03-1A ns 7.62 BH ns 4.57 BH03-2A ns 9.27 BH03-2B ns 6.10 BH08-1A ns 7.62 BH08-1B ns Apr Oct May Oct-11 Water Water Water Water Water Water Water Water Level Level Level Level Level Level Level Level Depth Elevation Depth Elevation Depth Elevation Depth Elevation (m BTR) (m ASL) (m BTR) (m ASL) (m BTR) (m ASL) (m BTR) (m ASL) Elevations obtained from 2008 Monitoring Report, Table 1 prepared by Golder Associates Ltd. (March 2009) m ASL metres above sea level m BTR metres below top of riser mbgs metres below ground surface ns not surveyed ni not installed dry no groundwater present in monitoring well Ref.: Page 2 of 2

37 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH03-1A (Bedrock) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug < Nov < May-05 < < Aug-05 < < Oct < May <2.0 <20 60 <0.10 < <0.01 <0.5 May < <0.10 < Oct Jun <2.0 <10 64 <0.10 < Aug Oct < <0.10 < May < <0.10 < <0.01 Apr <1 <5 84 <0.10 < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 1 of 12

38 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH03-1B / BH07-3 (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug < Nov < May-05 < < Aug < Oct < May <2.0 <20 43 <0.10 < <0.5 May Oct < <0.10 < Jun < <0.10 < Aug Oct < <0.10 < May < <0.10 < <0.01 May-09 (Duplicate) 0.13 <1 <5 53 <0.10 < <0.01 Apr-10 <0.02 <1 <5 13 <0.10 <0.10 < <0.01 May < <0.10 <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 2 of 12

39 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH03-2A (Bedrock) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug < Nov < May-05 < < Aug-05 < < Oct < May <2.0 < <0.10 < <0.5 May < <0.10 < Oct Jun < <0.10 < Aug Oct < <0.10 < May <1 <5 155 <0.10 < <0.01 Apr <1 <5 165 <0.10 < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 3 of 12

40 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH03-2B (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug < Nov < May-05 < < Aug-05 < < Oct < May <2.0 < <0.10 < <0.5 May < < Oct Jun < <0.10 < Aug Oct < <0.10 < May < <0.10 < <0.01 Apr < <0.10 < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 4 of 12

41 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH08-1A (Bedrock / Background) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May Aug Oct May Aug Nov May Aug Oct May May Oct Jun Aug < <0.10 < Oct < <0.10 < May <5 50 <0.10 < < Apr <0.10 < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 5 of 12

42 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH08-1B (Overburden / Background) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May Aug Oct May Aug Nov May Aug Oct May May Oct Jun Aug < <0.10 < Oct < <0.10 < May < < <0.01 Apr-10 <0.02 <1 <5 33 <0.10 <0.10 < May < <0.10 <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 6 of 12

43 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH10-BR (Bedrock) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug < Nov < May-05 < < Aug <0.10 < Oct < May May Oct Jun Aug Oct < <0.10 < May Apr < < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 7 of 12

44 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH10-M (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug < Oct < May < Aug Nov May-05 < < Aug-05 < <0.10 < Oct < May May Oct Jun Aug Oct < <0.10 < May Apr < <0.10 < <0.01 May < <0.10 < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 8 of 12

45 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well BH10-S (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May Aug Oct May Aug Nov May Aug Oct May May Oct Jun Aug Oct May Apr-10 <0.02 < < May < <0.01 All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 9 of 12

46 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well P1 (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug Oct May < Aug < Nov May-05 < < Aug-05 < <0.30 < Oct < May May Oct Jun Aug Oct < < May Apr May All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 10 of 12

47 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well P2 (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug Oct-03 < < May Aug Nov May-05 < Aug-05 < < Oct May May Oct Jun Aug Oct < < May Apr May All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 11 of 12

48 TABLE 2 GROUNDWATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Monitoring Well P7 (Overburden) Parameter Ammonia BOD COD Chloride Nitrate Nitrite TKN Total P DRP ODWS 1 ns ns ns ns ns ns RUC 4 ns ns ns ns ns ns May < Aug Oct < May < Aug Nov < May-05 < Aug-05 < < Oct < May May Oct Jun Aug Oct < < May Apr May All results reported in mg/l ns no standard - not analysed 1 Ontario Drinking Water Standards (ODWS) (MOE, 2003) 2 ODWS Table 2 Standards 3 ODWS Table 4 Objectives and Guidelines 4 Calculated Reasonable Use Concept (RUC) criteria based on the median parameter concentrations from background wells BH08-1A (bedrock well) and BH08-1B (overburden well). RUC calculated using Procedure B-7-1 (MOEE, 1994). Italics Exceeds ODWS BOLD Exceeds RUC Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 12 of 12

49 TABLE 3 SURFACE WATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Sample ID SW-1 Parameter Field Measurements Ammonia Un-ionized BOD COD Chloride Nitrate Nitrite TKN Total P DRP TDS TSS Temperature ph Conductivity DO Ammonia 3 Units ºC ph Units μs/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l PWQO 1 nc nc > nc 0.02 nc nc nc nc nc nc 0.03 nc nc nc May <0.02 < Aug < Oct <0.02 < May < Aug < Nov < May <0.01 <0.02 <2 < Aug <0.01 <0.02 <2 < Oct <0.01 <0.02 <2 < May < < <0.01 < <2 Aug <0.02 <2 < < Oct <0.02 <2 < < < May <0.02 < <2 Aug <0.02 <2 < < Oct <0.02 < < Jun nv 0.06 <0.02 < < Aug <0.02 < < <2 Oct <0.02 < < Apr < Aug < < < Oct <1 < < Apr < < Aug < Oct < < May < < < < Aug < < Oct < < < na not applicable nc no criterion - not analysed / not reported 1 Provincial Water Quality Objectives, (PWQO), MOEE, February 1994 as updated. Where available, interim PWQO are referenced. 2 Warm Water Biota criterion is temperature dependant 3 Methodology for calculating unionized ammonia based on PWQO (MOEE, 1994) using field measured temperature and ph. BOLD Exceeds PWQO criterion Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 1 of 3

50 TABLE 3 SURFACE WATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario BOD COD Sample ID SW-2 Parameter Field Measurements Ammonia Un-ionized Chloride Nitrate Nitrite TKN Total P DRP TDS TSS Temperature ph Conductivity DO Ammonia 3 Units ºC ph Units μs/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l PWQO 1 nc nc > nc 0.02 nc nc nc nc nc nc 0.03 nc nc nc May <0.02 < Aug <0.02 < Oct <0.02 < May < Aug <0.02 < Nov < May <0.01 <0.02 <2 < Aug <0.01 <0.02 <2 < Oct <0.02 < < May < < < <2 Aug <0.02 < < Oct <0.02 <2 < < < May <0.02 < Aug <0.02 <2 < < < Oct <0.02 < <0.10 < Jun nv 0.49 < < Aug <0.02 < < Oct <0.02 < < Apr < Aug < <1 < < < Oct <1 < < Apr < < Aug < Oct < < May < < <0.10 < Aug < Oct < < na not applicable nc no criterion - not analysed / not reported 1 Provincial Water Quality Objectives, (PWQO), MOEE, February 1994 as updated. Where available, interim PWQO are referenced. 2 Warm Water Biota criterion is temperature dependant 3 Methodology for calculating unionized ammonia based on PWQO (MOEE, 1994) using field measured temperature and ph. BOLD Exceeds PWQO criterion Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 2 of 3

51 TABLE 3 SURFACE WATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Sample ID SW-3 Parameter Field Measurements Ammonia Un-ionized BOD COD Chloride Nitrate Nitrite TKN Total P DRP TDS TSS Temperature ph Conductivity DO Ammonia 3 Units ºC ph Units μs/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l PWQO 1 nc nc > nc 0.02 nc nc nc nc nc nc 0.03 nc nc nc May <0.02 < Aug < Oct <0.02 < May < Aug <0.02 < Nov < May <0.01 <0.02 <2 < Aug <0.01 <0.02 <2 < Oct <0.02 <2 < May < < <0.01 < <2 Aug <0.02 <2 < < Oct <0.02 <2 <20 <1 <0.10 < < May <0.02 < Aug <0.02 < < < Oct <0.02 < < Jun nv 0.09 <0.02 < Aug <0.02 < < <2 Oct <0.02 < < Apr < Aug < < < < Oct < < Apr < < Aug < Oct < < < May < < < <2 Aug < < Oct < < na not applicable nc no criterion - not analysed / not reported 1 Provincial Water Quality Objectives, (PWQO), MOEE, February 1994 as updated. Where available, interim PWQO are referenced. 2 Warm Water Biota criterion is temperature dependant 3 Methodology for calculating unionized ammonia based on PWQO (MOEE, 1994) using field measured temperature and ph. BOLD Exceeds PWQO criterion Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 3 of 3

52 TABLE 4 LAGOON WATER ANALYTICAL RESULTS Maxville Sewage Lagoons, Township of North Glengarry, Ontario Sample ID EAST POND Parameter Field Measurements Ammonia Unionized BOD COD Chloride Nitrate Nitrite TKN Total P DRP TDS TSS Temperature ph Conductivity DO Ammonia 3 Units ºC ph Units μs/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l PWQO 1 nc nc > nc 0.02 nc nc nc nc nc nc 0.03 nc nc nc May Aug Oct < May Aug Nov May Aug Oct May Aug Oct May <0.10 < Oct <0.020 < < <2 Jun <0.02 < <0.10 < Aug < Oct < May < < Aug < Oct < Apr < < Aug < Oct < May < Aug < <0.10 < <2 Oct <0.10 < na not applicable nc no criterion - not analysed / not reported 1 Provincial Water Quality Objectives, (PWQO), MOEE, February 1994 as updated. Where available, interim PWQO are referenced. 2 Warm Water Biota criterion is temperature dependant 3 Methodology for calculating unionized ammonia based on PWQO (MOEE, 1994) using field measured temperature and ph. BOLD Exceeds PWQO criterion Note: Results prior to 2009 reported by Golder Associates Ltd. Ref.: Laboratory Analyses by Exova, Ottawa, Ontario Page 1 of 1

53 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON APPENDIX A CERTIFICATE OF APPROVAL NO GNPH5 Ref.: March 2012

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71 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON APPENDIX B LABORATORY CERTIFICATES OF ANALYSIS - GROUNDWATER Ref.: March 2012

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76 2011 Groundwater and Surface Water Monitoring Program Maxville Sewage Lagoons, Township of North Glengarry, ON APPENDIX C LABORATORY CERTIFICATES OF ANALYSIS - SURFACE WATER AND LAGOON SAMPLES Ref.: March 2012

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