Sam Ziemann From - Region of Waterloo

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HYDROGEOLOGICAL ASSESSMENTSTRANGE STREET WATER SUPPLY CLASS EA UPDATEREGIONAL MUNICIPALITY OF WATERLOOBackground ReviewMarch 19, 2012With some exceptions, the monitoring and production wells on the western edge of the well field(such as K13 and K11) typically have lower concentrations of chloride and sodium than thosewells further east (such as K12 and K17). In particular, wells east of Westmount Road tend toexhibit elevated sodium and chloride.2.7.2 IronIron concentrations found within production wells have varied historically, but are typically belowthe ODWS AO of 0.3 mg/L (Figure 5). Iron levels within raw water obtained from ProductionWell K10/K10A have been the most variable, with occasional spikes in the data resulting inexceedances of the ODWS AO. Water quality results obtained from monitoring wells in the2010 sampling event found elevated iron concentrations in all wells (Appendix D). During the1999 sampling event (Stantec, 2000), the ODWS AO was exceeded in monitoring wells near allthe currently active production wells. Elevated iron is naturally found in groundwater extractedfrom this aquifer, and is not the result of anthropogenic activity.2.7.3 ManganeseWithin the Strange Street Production Wells, manganese has historically been near or above theODWS AO of 0.05 mg/L (Figure 5). A slight increasing trend was noted for all production wells,with Production Wells K10/K10A and K11 typically having the highest levels of manganese.Production Well K12 also exhibited elevated levels of manganese while in operation, typicallyabove 0.4 mg/L. Within monitoring wells sampled as part of the 2010 monitoring program(Appendix D), elevated manganese was observed to be above the ODWS AO in all monitoringwells located east of Production Wells K18 and K19. Elevated manganese is naturally found ingroundwater extracted from this supply aquifer, and is not the result of anthropogenic activity.2.7.4 SulphateSulphate concentrations at Production Wells within the Strange Street Well Field have beenrelatively stable since monitoring began in the early 1980’s (Figure 5). At all Production Wells,with the exception of one exceedance by Production Well K17 in October of 1982, sulphatelevels have remained below the ODWS AO of 500 mg/L. All currently active Production Wellshave been consistently below 200 mg/L since 1995.Sulphate concentrations of samples collected from monitoring wells within the study area werebelow the ODWS AO and did not exceed 100 mg/L, with the exception of SS13-99 (Figure 2),where sulphate was measured at 177 mg/L (Appendix D). The results are consistent withStantec (2000) where sulphate was not observed to be above the ODWS AO in any of themonitoring wells.2.12 hls v:\01609\active\161110897_strange_st\planning\report\final hydrogeo assessment\final\fnl_rpt_120319.docx
HYDROGEOLOGICAL ASSESSMENTSTRANGE STREET WATER SUPPLY CLASS EA UPDATEREGIONAL MUNICIPALITY OF WATERLOOBackground ReviewMarch 19, 20122.7.5 NitrateConcentrations for nitrate have remained well below the ODWS Maximum AcceptableConcentration (MAC) of 10 mg/L (Figure 5), with the exception of one occurrence at ProductionWell K11 in June of 1987 where nitrate concentrations reached 9.25 mg/L. Since 2000, levelsfor nitrate at all active Production Wells have remained below 1 mg/L. Nitrate concentrations inmonitoring wells were consistently either not detected or was found to be well below the ODWSMAC.2.7.6 Volatile Organic CompoundsUpon reviewing historical volatile organic compound water quality data for the production wells,the following parameters were observed on more than one occasion in the indicated productionwell:• 1,4 dioxane was detected twice between 2004 and 2007 in Production Well K10A;• Tetrachloroethylene was detected twice in 2004 and 2005 at Production Well K10A andseven (7) times at Production Well K12 between 1992 and 1999; and• Phenolics, styrene, trichloroethylene, 1,1,1-Trichloroethane and 1,1-Dichloroethane werehistorically detected at Production Wells K12 and K17, located on the eastern edge of thewell field.Based on the 2010 water quality samples collected from monitoring wells throughout theStrange Street Well Field, which were non-detect for all tested volatile organic compounds(VOCs) (Appendix D – Table 1), and considering that most detections of organic compoundshave been found from the eastern portion of the well field from former Production Wells K12 andK17, VOCs are not considered to be a concern to water quality at the Strange Street Well Field.hls v:\01609\active\161110897_strange_st\planning\report\final hydrogeo assessment\final\fnl_rpt_120319.docx 2.13
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March 2, 2011Reference: 006-189Stan
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TABLE 1REGIONAL MUNICIPALITY OF WAT
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HYDROGEOLOGICAL ASSESSMENTSTRANGE S
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July 23, 2010Lisa Lachuta, P.Eng.Pa
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TECHNICAL MEMORANDUM A1 -STRANGE ST
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TECHNICAL MEMORANDUM A1 -STRANGE ST
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TABLE 1SUMMARY OF GROUNDWATER ANALY
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Sam Ziemann From - Region of Waterloo

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