Sam Ziemann From - Region of Waterloo

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HYDROGEOLOGICAL ASSESSMENTSTRANGE STREET WATER SUPPLY CLASS EA UPDATEREGIONAL MUNICIPALITY OF WATERLOOResults for Test WellMarch 19, 2012to 335.2 m AMSL (10.06 m BGS). The fine grained sediments foundwithin this range were interpreted to correspond to AFB1, the upperportion of Aquifer 1. Monitoring Well K-SS-OW1C-11 was screenedwithin AFB1, with the lower 60 cm being within AFB2 as ATB2 was notidentified here. AFB1 was differentiated from AFB2 based on grain sizeobservations, with AFB1 interpreted to being finer grained than AFB2.AFB2 (Aquifer 1):ATB2 (Aquifer 1):Deposits of stratified sand to gravel were noted extending from335.2 m AMSL (10.06 m BGS) to 316.6 m AMSL (28.68 m BGS).Significantly coarser gravel sections of 3.1 m and 1.7 m thick wereobserved from 332.9 m AMSL to 329.7 m AMSL and from 323.6 m AMSLto 321.9 m AMSL, respectively. These deposits of sand to gravel wereinterpreted to correspond to AFB2, the lower portion of Aquifer 1. ATB2represents the main supply aquifer for the Strange Street Well Field.Monitoring Well K-SS-OW1B-11 was screened within AFB2. TestWell K-SS-TW1-11 was screened within the lower gravel section withinAFB2.ATB2 (Aquifer 1), the middle Maryhill Till, bisects Aquifer 1 into two units(AFB1/AFB2) within some areas of the Strange Street Well Field. AFB2was not encountered during the advancement of K-SS-OW1A-11, despitebeing present (2.3 m thick) at Monitoring Well SS13-99 which is locatedless than 300 m east.ATB3 (Aquitard 2): Silty clay till comprising the lower Maryhill Till associated with ATB3(Aquitard 2) was encountered from 316.6 m AMSL (28.68 m BGS) to313.7 m AMSL (31.6 m BGS), about 2.9 m thick.ATC1 (Aquitard 3): Below 313.7 m AMSL (31.6 m BGS) sandy silt to sand till associated withupper/main Catfish Creek Till deposits was encountered to a depth of296.4 m AMSL (48.8 m BGS). These deposits correspond to ATC1(Aquitard 3), a main stratigraphic marker unit within the WaterlooMoraine.AFC1 (Aquifer 2):Clayey silt to gravel with sand was encountered from 296.4 m AMSL(48.8 m BGS) to 289.4 m AMSL (55.9 m BGS) and is associated withCatfish Stratified Deposits that bisect ATC1 and ATC2 where present.K-SS-OW1A-11 was screened within AFC1.ATC2 (Aquitard 3): Sandy silt to sand till identified as ATC2, Lower Catfish Creek Till, wasidentified as 10.0 m thick and extended from 289.4 m AMSL(55.9 m BGS) to 279.4 m AMSL (65.84 m BGS).4.2 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 WATERLOOResults for Test WellMarch 19, 2012ATE1 (Aquitard 4):AFF1 (Aquifer 4):A greyish brown to brown silty clay unit believed to correspond toCanning Drift Till was found from 279.4 m AMSL (65.8 m BGS) to275.8 m AMSL (69.5 m BGS).A vertically extensive sand and gravel aquifer corresponding to AFF1(Aquifer 4) was identified between 275.8 m AMSL (69.5 m BGS) and265.2 m AMSL (80.0 m BGS).ATG1 (Aquitard 4): Silty clay to sandy silt till was observed to overlie bedrock from265.2 m AMSL (80.0 m BGS) to 263.3 m AMSL (81.9 m BGS). Thesedeposits were identified as Pre-Canning Coarse Till.Bedrock:Bedrock was encountered at a total depth of 81.9 m BGS(263.3 m AMSL). The dark grey limestone was identified as the GuelphFormation and was observed to extend to the base of the borehole at262.6 m AMSL (82.6 m BGS).Figure 4 presents cross-section A-A’, which extends across the Strange Street Well Field in aneast west direction. The cross-section location is shown in Figure 2. The most significantchange in the hydrostratigraphic interpretation based on the most recent drilling results is thelocal absence of ATB2 at K-SS-TW1-11, which confirms the unit is not continuous in the area asobserved by the presence of ATB2 300 m west at SS13-99 and about 400 m east at SS07-99.ATB1 (Aquitard 1) was confirmed to be absent at K-SS-TW1-11, as observed at nearbymonitoring well SS13-99, but is interpreted to be present further to the west along the flank ofthe Waterloo Moraine.4.3 WELL CONSTRUCTIONThe test well design was completed in consultation with Gerrits using the information collectedfrom the advancement of the initial borehole (K-SS-OW1A-11) and grain size analysiscompleted on the samples collected during the advancement of K-SS-TW1-11. The targetdepth for the screen installation was the thick sand and gravel to gravel sequence observed atthe base of AFB2 (Aquifer 1). The well construction activities for Test Well K-SS-TW1-11consisted of the following:• Beginning March 1, 2011, a 254 mm OD temporary well casing was installed using air rotarydrilling techniques to a depth of 19.8 m BGS;• On March 2, 2011, a 154 mm OD steel casing was installed using air rotary drillingtechniques to a depth of 28.9 m BGS;• On March 3, 2011, a 127 mm diameter telescopic screen was installed from 21.3 m to27.5 m BGS using a K-packer. The screen is constructed with a 20 slot screen from 21.3 mhls v:\01609\active\161110897_strange_st\planning\report\final hydrogeo assessment\final\fnl_rpt_120319.docx 4.3
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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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