Sam Ziemann From - Region of Waterloo

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July 23, 2010Lisa Lachuta, P.Eng.Page 2 of 7Reference: Technical Memorandum A1 –Strange Street Well Field Water Quality Assessment• SS09-99;• SS11-99;• SS12-99;• SS13-99;• OW1-82;• 11 Maple Hill Drive (RW1);• 35 Maple Hill Drive (RW2); and• 814 Glasgow Street (RW3).For each of the regional monitoring wells sampled, a photograph was taken and aRegion Observation Well Survey Form was completed, and are provided inAttachment C. No major problems were noted at any of the monitoring wells that weresampled.During a residential well survey in the Maple Hill Drive and Glasgow Street area, it wasnoted that two residents who were previously identified as being on private wells(Stantec, 2000) are now connected to municipal services. It is unknown whether theirwells have been decommissioned, however, at this point it is believed that they are stillin existence. It is recommended that the Region follow-up with these homeowners toensure the wells are properly decommissioned. These two private residences arelocated at 7 Maple Hill Drive and 8 Maple Hill Drive.The following wells which were included as part of the original sampling plan were notsampled due to either the wells being decommissioned, not located, or noted asdestroyed during previous field surveys:• OW4B-46;• TW2-74;• TW3-74; and• TW3-79.All samples were analyzed for select volatile organic compounds (VOC) and metals,anions, and general chemistry parameters. A total of one (1) field duplicate wascollected during this sampling program.The residential wells (RW1, RW2 and RW3) were sampled from raw water taps locatedeither outside of the home or from a basement tap on May 19, 2010. All residentialwells were purged prior to sampling until stable readings were obtained for pH andconductivity. All monitoring wells were purged at least 3 well volumes prior to sampling,or until stable readings were obtained for temperature, pH and conductivity. Monitoringwells were sampled on May 19, May 25 and May 26, 2010. Samples were collectedfrom dedicated tubing or sampling lines directly into the appropriate laboratory suppliedsample containers, and preserved and filtered according to laboratory protocols. The
July 23, 2010Lisa Lachuta, P.Eng.Page 3 of 7Reference: Technical Memorandum A1 –Strange Street Well Field Water Quality Assessmentdissolved organic carbon (DOC) and metals samples collected at the residential wellswere not field filtered, and were subsequently filtered by the lab for metals. DOC wastherefore not analyzed for these residential wells.The samples were delivered in chilled containers to the Region’s EnvironmentalEnforcement and Laboratory Services (EELS), 100 Maple Grove Road, Cambridge,Ontario under Chain of Custody documentation. Attachment D contains a copy of theLaboratory Certificates of Analysis.1999 WATER QUALITY RESULTSIn addition to assessing the water quality results obtained during the 2010 samplingprogram, historical results were also reviewed. The Region currently does not regularlysample from any monitoring wells within the Strange Street Well Field. The only datawhich was found to be available was for select wells which were sampled as part of theinitial Class EA completed by the Region in 2000 (Stantec, 2000). These monitoringwells were sampled during 1999 following installation and well development. Duringthis sampling program, the following wells were analyzed for a series of inorganic andorganic parameters:• OW4B-46;• TW2-74;• TW8-79;• SS07A/B-99;• SS08-99;• SS09-99;• SS10-99; and• SS11-99.REVIEW OF HISTORICAL WATER QUALITY DATAStantec undertook a detailed review of the available water quality information for selectnearby monitoring wells and all the production wells, where observed concentrationswere compared to the Ontario Drinking Water Standards (ODWS). Key parameters ofinterest within the aquifer included chloride, sodium, iron, manganese, sulphate andnitrate. Consistent with other production wells throughout the Region, all monitoringand production wells exhibit elevated hardness. Organics were not detected within anyof the wells sampled during the 2010 field program. A summary of the water qualityparameters of interest for the Strange Street Well Field are summarized below, withdata summarized in Figures 1 and 2 (Attachment A) and provided in Table 1(Attachment B).CHLORIDE AND SODIUMAn increasing trend in chloride has been noted in all the existing and former productionwells within the Strange Street Well Field (Figure 2). Chloride concentrations nearing or
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APPENDIX EHydrogeological Assessmen
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HYDROGEOLOGICAL ASSESSMENTSTRANGE S
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TABLE 2SUMMARY OF GROUNDWATER ANALY
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Sam Ziemann From - Region of Waterloo

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