Sam Ziemann From - Region of Waterloo

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HYDROGEOLOGICAL ASSESSMENTSTRANGE STREET WATER SUPPLY CLASS EA UPDATEREGIONAL MUNICIPALITY OF WATERLOO3.0 Methodology for Test WellBased on the assessment of existing well performance, hydrogeologic conditions and waterquality throughout the Strange Street Well Field, the need for at least one additional productionwell was identified. The following section details the methodology regarding the site selection,installation and performance testing of an additional test well completed within the StrangeStreet Well Field.3.1 IDENTIFICATION OF TEST DRILLING LOCATIONSIn 2010, Stantec completed a background review of potential test well drilling locations whichwas documented in Technical Memorandum A2 (Appendix E). Accessible land within theStrange Street Well Field was identified as parcels of land that were either owned by the Regionor the City of Kitchener. A total of six (6) potential test drilling locations were identified within theStrange Street Well Field:• Knell Drive (between K11A andK13);• Strange Street Reservoir;• K17 Well Site;• K12 Well Site;• Gzowski Park (east of K13); and• Westmount golf and Country Club.The potential test drilling locations are shown on Figure 6 and were evaluated based onthree (3) criteria; water quantity, water quality and ease of system connection. A numericalvalue was assigned to each criterion to assist with prioritizing each test drilling location with thelowest score corresponding to a preferred drilling location and a high score corresponding to aless desirable drilling location.3.2 RESIDENTIAL NOTIFICATIONPrior to commencement of drilling activities, a residential notification letter was delivered onJanuary 14, 2011 to residents living on Rossford Crescent and Chopin Drive betweenWestmount Road West and Markwood Drive (Figure 7). These houses were located adjacentto Gzowski Park and the proposed test well drilling location. The houses are supplied withmunicipal water and therefore the potential for well interference was not an issue. The letterdetailed the timing of drilling activities and discussed the potential for disturbances during theinstallation of the well and subsequent testing. A copy of the notification letter is provided inAppendix F.hls v:\01609\active\161110897_strange_st\planning\report\final hydrogeo assessment\final\fnl_rpt_120319.docx 3.1
HYDROGEOLOGICAL ASSESSMENTSTRANGE STREET WATER SUPPLY CLASS EA UPDATEREGIONAL MUNICIPALITY OF WATERLOOMethodology for Test WellMarch 19, 20123.3 MONITORING WELL INSTALLATIONA monitoring well nest was constructed at the location of K-SS-OW1-11 (Figure 7). The wellnest consisted of three individual monitoring wells installed within the overburden. GerritsDrilling and Engineering Ltd. (Gerrits) was retained by the Region to complete the monitoringwell drilling.Aardvark Drilling Inc. (Aardvark) was retained by Gerrits to complete the monitoring well drillingat K-SS-OW1A-11 between January 24, 2011 and February 4, 2011. The monitoring well wasadvanced using a CME75 truck-mounted drill rig. The 123 mm diameter borehole wasadvanced to the top of bedrock (82.6 m BGS) using mud rotary drilling techniques with 85 mmdiameter PQ continuous core samples collected over the entire depth of the borehole.Gerrits completed the monitoring well drilling at K-SS-OW1B-11 and K-SS-OW1C-11 betweenFebruary 16, 2011 and February 18, 2011. The monitoring wells were advanced using aDR-12 air fluid rotary drill rig. The 152 mm diameter borehole was advanced to target depths of28.9 m BGS and 10.7 m BGS at K-SS-OW1B-11 and K-SS-OW1C-11, respectively, using airfluid rotary drilling techniques. Water was used as the drilling fluid. During advancement ofK-SS-OW1B-11, grab samples were collected at 1.52 m intervals over the entire depth of theborehole. Gerrits completed grain size analysis on samples collected from 18.3 m BGS to27.4 m BGS to determine the grain size which represents 50% of the retained material.The recovered soil cores from K-SS-OW1A-11 were placed into PVC splits 1.52 m in length andlabeled in accordance with the Region core logging protocol (Region, 2008). Soil samples wereclassified by Stantec personnel using the America Society for Testing and Materials (ASTM)guideline for visual-manual description and identification of soils. Logs were prepared for theborehole, containing descriptions (where relevant and possible) of soil type, texture, colour,structure, moisture content, and other observations. Once drilling was completed, the core wasdelivered to the Region’s core storage location at the Mannheim Treatment Plant Site.All monitoring wells were constructed in separate boreholes using 49 mm ID Schedule 80 PVCwell casing for the deep (A) and intermediate (B) boreholes and 51 mm ID schedule 40 PVCwell casing for the shallow (C) borehole. The wells were constructed with No. 10 Slot (0.01 inchslot) PVC well screens, 3.05 m in length. The annular space between the monitoring well andformation was backfilled with No. 2 silica sand surrounding the screens. At K-SS-OW1C-11 theremainder of the annular space was filled with Holeplug TM to prevent hydraulic connection withinthe borehole. At K-SS-OW1A-11 and K-SS-OW1B-11 a combination of Holeplug TM andbentonite grout was used to fill the remainder of the annular space above and below the wellscreens to prevent hydraulic connection within the borehole. Positive displacement methodswere used to place the bentonite grout. The surface seal at all three (3) monitoring wellsconsisted of cement to 0.4 m BGS. All wells were constructed with individual lockable steelprotective casings.3.2 hls v:\01609\active\161110897_strange_st\planning\report\final hydrogeo assessment\final\fnl_rpt_120319.docx
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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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Sam Ziemann From - Region of Waterloo

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