February 24, 2015 Reference: 298

Transcription

1 1297 Old Bridle Path Oakville, Ontario L6M 1A6 Tel: Fax: GEO KAMP LIMITED February 24, 2015 Reference: 298 MR. JOHN SPINA CALEDON VILLAS 55 BLUE WILLOW DRIVE WOODBRIDGE, ONTARIO L4L 9E8 RE: HYDROGEOLOGIC ASSESSMENT FOR CALEDON VILLAS RESPONSE TO DECEMBER 16, 2014 TRCA REVIEW COMMENTS (4 th COMMENTS) INTRODUCTION AND BACKGROUND A residential development is proposed in the Village of Caledon East at the north east corner of Innis Lake and Old Church Roads. The proposed development is referred to as Caledon Villas. A Hydrogeologic Assessment was prepared by Geo Kamp Limited (dated November 12, 2012) to support the land use change from agricultural to residential. Agency Review Comments (specifically from the TRCA, Town of Caledon and Peel Region) were received in April 2013 and as such the Hydrogeologic Assessment was revised in an updated report dated July 31, The Toronto and Region Conservation Authority (TRCA) reviewed the July 31, 2013 revised report and provided additional comments in correspondence dated October 8, 2013 (referred to as second review comments). A letter dated October 25, 2013 was prepared by Geo Kamp Limited in response to the second set of TRCA comments. A third set of TRCA comments was issued in correspondence dated September 9, A letter dated October 16, 2014 was prepared by Geo Kamp Limited in response to the third set of TRCA comments. On November 21, 2014, Mr. Bruce Hietkamp of Geo Kamp Limited and Mr. Jehan Zeb of the TRCA discussed the October 16, 2014 response by telephone. Further to the November 21, 2014 telephone discussion, Geo Kamp Limited prepared a Technical Memorandum dated November 24, 2014 to address the items discussed during the telephone discussion. The TRCA forwarded comments dated December 16, 2014 in response to the November 24, 2014 Technical Memorandum (referred to as fourth review comments). The following letter is a response to the 4 th TRCA review comments regarding Hydrogeology. The TRCA comment is provided followed by Geo Kamp s response in orange italic. In addition to the TRCA response below, The TRCA requested that the hydrogeologic evaluation include 12 months of water level monitoring so that the seasonal variations can be established. The accompanying letter includes a wrap-up of the 12 months of water level monitoring. GEO KAMP LIMITED Page 1 of 5

2 Hydrogeologic Assessment For Caledon Villas February 24, 2015 Response to TRCA 4 th Review Comments Dated December 16, 2014 Geo Kamp Limited Reference #: 298 TRCA COMMENTS Comment 3: Chloride Dilution (Geo Kamp Ltd. Technical Memorandum dated Nov 24, 2014): We note that within the Geo Kamp Ltd. memo, the consultant is proposing to infiltrate about 9,395 m 3 of treated stormwater run-off from the SWM pond to meet the infiltration rate. TRCA staff is concern with the infiltration of treated stormwater from the SWM pond facility, because of the potential for increased chloride concentrations within the groundwater system. Therefore, we are requesting that the consultant provides additional analysis for chloride concentration that considers the baseline chloride concentration within the groundwater system. On February 13, 2015 a water sample was collected from the East Bored well and submitted to Agat Laboratories for chloride analyses. The East Bored Well was sampled because it is completed within the water table which is the same as the rest of the on-site monitoring wells. The well is currently in service and as such, the well pumping system provided a simple method to collect representative and turbid free shallow groundwater samples. The results of the analyses for the water samples collected are attached and the chloride concentration is reported as 13.2 mg/l. There is currently no water quality objective (surface water) for chloride in Ontario. The Canadian guidelines for chloride set by the Canadian Council of Ministers of the Environment (CCME) indicate increased risk of harm to aquatic life after long term exposure to concentrations above 120 mg/l (CCME 2011). The guidelines also indicate increased risk of harm to aquatic life after short term exposure to concentrations above 640 mg/l. The Ontario Drinking Water Standard for drinking water is 250 mg/l (aesthetic objective). The chloride dilution calculation provided in the Geo Kamp Limited November 24, 2014 Technical Memorandum estimated a chloride concentration of 65 mg/l as a result of the infiltration of treated stormwater from the SWM pond. If the calculated 65 mg/l is directly added to the background concentration of 13.2 mg/l, the LID measures (78.2 mg/l) would likely result in chloride levels that are less than the CCME guideline of 120 mg/l. GROUNDWATER LEVELS The TRCA has suggested that the Hydrogeologic evaluation include 12 months of water level monitoring so that the seasonal variations can be established. The groundwater level monitoring was initiated in May 2012 and restated again in December There are a total of 32 months of water level monitoring with 12 months of continuous data (1 hour readings). A total of 6 water level data loggers were deployed at five geotechnical boreholes and one the hand auger monitoring well located in the kettle depression feature. The two on site dug wells were also manually measured during site inspections (for a total of seven measurements). The final results are presented in Figure 18B and a summary of manual measurements is presented in Table 1. A comparison of the automated water level data to the manual data (plotted in hydrographs and summarized in Table1) indicates that the automated water level data was accurate of the data that was collected (matches the manual water level measurements). The results of the monitoring program were summarized in correspondence dated October 16, 2014 (representative of 11 months of continuous monitoring). The seasonal highs and lows from the October 16, 2014 correspondence (summarized below) are unchanged with the additional two months of monitoring. The conclusions in the October 16, 2014 correspondence are unchanged and the water level monitoring program has since been terminated. GEO KAMP LIMITED Page 2 of 5

3 Hydrogeologic Assessment For Caledon Villas February 24, 2015 Response to TRCA 4 th Review Comments Dated December 16, 2014 Geo Kamp Limited Reference #: 298 Location High Water Level Low Water Level Change m BTOC Date m BTOC Date (m) BH May Apr BH Apr Mar BH May Mar BH Jun May BH Jun Apr Kettle (SW) Apr Sep Kettle (GW) Jun Jul East Well Jul Oct West Well Jul Oct Please call the undersigned should you have any questions or require additional information. GEO KAMP LIMITED Bruce Hietkamp, P. Geo. Hydrogeologist Figure 14, Borehole and Monitoring Well Location Plan Figure 18B, Hydrographs (All Data) Table 1, Water Level Summary Agat Laboratories Limited Certificate of Analysis GEO KAMP LIMITED Page 3 of 5

4 m AMSL m AMSL MW 2 BH4 MW m AMSL MW m DRY MW10 AM SL kettle depression BH11 BH5 BH9 BH8 West Well East Well 289 m m AMSL MW 6 DRY Water Levels-June 8, 2012 AM SL MW 7 GEO KAMP LIMITED PROPOSED CALEDON EAST SUBDIVISION HYDROGEOLOGIC ASSESSMENT BOREHOLE LOCATION PLAN REF#: 298 FIGURE 14

5 WATER LEVEL BELOW TOP OF CASING metres) 14-May-12 4-Jun Jun Jul-12 6-Aug Aug Sep-12 8-Oct Oct Nov Dec Dec Jan Feb-13 4-Mar Mar Apr-13 6-May May Jun-13 8-Jul Jul Aug-13 9-Sep Sep Oct Nov-13 2-Dec Dec Jan-14 3-Feb Feb Mar-14 7-Apr Apr May-14 9-Jun Jun Jul Aug-14 1-Sep Sep Oct-14 3-Nov Nov Dec-14 5-Jan Kettle is Dry Below depth of 1.25 m Dry 8.0 BH2 BH3 BH6 BH10 BH12 Kettle BH12 manual KETTLE GW monitor EAST WELL WEST WELL GEO KAMP LIMITED PROPOSED CALEDON EAST SUBDIVISION HYDROGEOLOGIC ASSESSMENT HYDROGRAPHS (ALL DATA) FIGURE 18B

6 LOCATION Ground elevation (m AMSL) TOC stick up (m AGL) Depth (m BGL) BH2 manual BH3 manual BH6 manual BH7 manual BH10 manual BH12 manual Notes UTM Coordinates Static Water Level Static Water Level Static Water Level Static Water Level Static Water Level Static Water Level DATE m BTOC m AMSL m BTOC m AMSL m BTOC m AMSL m BTOC m AMSL m BTOC m AMSL m BTOC m AMSL 14-May Jun Jun BH7 Damaged 26-Jun Dec corn dried out, install loggers 11-Apr corn still in field 9-Oct soya bean 17-Dec remove loggers LOCATION Ground elevation (m AMSL) TOC stick up (m AGL) Depth (m BGL) EAST WELL WEST WELL UTM Coordinates Static Water Level Static Water Level DATE m BTOC m AMSL m BTOC m AMSL 14-May Jun Jul Sep Apr Oct Dec LOCATION KETTLE GW monitor KETTLE SW Ground elevation (m AMSL) 292 TOC stick up (m AGL) Depth (m BGL) UTM Coordinates Static Water Level Static Water Level DATE m BTOC m AMSL m BTOC m AMSL 4-Jun Jun Jul Sep Apr Oct Dec almost ice Notes: m AMSL - metres Above Mean Sea Level m AGL - meters Above Ground Level m BTOC - metres Below Top of Casing TOC - Top Of Casing m AGL - meters Below Ground Level UTM - Universal Transverse Mercator BH elevations from Soil Engineers Ltd. East and West Well elevations from Ontario Base Mapping GEO KAMP LIMITED PROPOSED CALEDON EAST SUBDIVISION HYDROGEOLOGIC ASSESSMENT WATER LEVEL SUMMARY TABLE 1

7 5835 COOPERS AVENUE MISSISSAUGA, ONTARIO CANADA L4Z 1Y2 TEL (905) FAX (905) CLIENT NAME: GEOKAMP LTD OLD BRIDLE PATH OAKVILLE, ON L6M1A3 (905) ATTENTION TO: BRUCE HEITKAMP AGAT WORK ORDER: 15T WATER ANALYSIS REVIEWED BY: Parvathi Malemath, Data Reviewer DATE REPORTED: Feb 23, 2015 PAGES (INCLUDING COVER): 5 PROJECT: 298 Caledon Villas VERSION*: 1 Should you require any information regarding this analysis please contact your client services representative at (905) *NOTES All samples will be disposed of within 30 days following analysis. Please contact the lab if you require additional sample storage time. Laboratories (V1) Page 1 of 5 Member of: Association of Professional Engineers, Geologists and Geophysicists of Alberta (APEGGA) Western Enviro-Agricultural Laboratory Association (WEALA) Environmental Services Association of Alberta (ESAA) AGAT Laboratories is accredited to ISO/IEC by the Canadian Association for Laboratory Accreditation Inc. (CALA) and/or Standards Council of Canada (SCC) for specific tests listed on the scope of accreditation. AGAT Laboratories (Mississauga) is also accredited by the Canadian Association for Laboratory Accreditation Inc. (CALA) for specific drinking water tests. Accreditations are location and parameter specific. A complete listing of parameters for each location is available from and/or The tests in this report may not necessarily be included in the scope of accreditation. Results relate only to the items tested and to all the items tested

8 CLIENT NAME: GEOKAMP LTD. SAMPLING SITE: DATE RECEIVED: Parameter Unit SAMPLE DESCRIPTION: SAMPLE TYPE: DATE SAMPLED: G / S RDL Chloride mg/l E Well - Chloride Water 2/13/ Certificate of Analysis AGAT WORK ORDER: 15T PROJECT: 298 Caledon Villas ATTENTION TO: BRUCE HEITKAMP Chloride (Water) SAMPLED BY:Bruce Hietkamp DATE REPORTED: COOPERS AVENUE MISSISSAUGA, ONTARIO CANADA L4Z 1Y2 TEL (905) FAX (905) Comments: RDL - Reported Detection Limit; G / S - Guideline / Standard: Refers to O.Reg.169/03(mg/L) Chloride Analysis: The RDL was changed to reflect the dilution required to keep the analytes in a valid calibration range of the instrument. CERTIFICATE OF ANALYSIS (V1) Certified By: Results relate only to the items tested and to all the items tested Page 2 of 5

9 CLIENT NAME: GEOKAMP LTD. PROJECT: 298 Caledon Villas SAMPLING SITE: Quality Assurance Water Analysis AGAT WORK ORDER: 15T ATTENTION TO: BRUCE HEITKAMP SAMPLED BY:Bruce Hietkamp 5835 COOPERS AVENUE MISSISSAUGA, ONTARIO CANADA L4Z 1Y2 TEL (905) FAX (905) RPT Date: Feb 23, 2015 DUPLICATE REFERENCE MATERIAL METHOD BLANK SPIKE MATRIX SPIKE PARAMETER Batch Sample Id Dup #1 Dup #2 RPD Method Blank Measured Value Acceptable Limits Lower Upper Acceptable Limits Recovery Lower Upper Acceptable Limits Recovery Lower Upper Chloride (Water) Chloride % < % 90% 110% 109% 90% 110% 114% 80% 120% Certified By: QUALITY ASSURANCE REPORT (V1) Page 3 of 5 AGAT Laboratories is accredited to ISO/IEC by the Canadian Association for Laboratory Accreditation Inc. (CALA) and/or Standards Council of Canada (SCC) for specific tests listed on the scope of accreditation. AGAT Laboratories (Mississauga) is also accredited by the Canadian Association for Laboratory Accreditation Inc. (CALA) for specific drinking water tests. Accreditations are location and parameter specific. A complete listing of parameters for each location is available from and/or The tests in this report may not necessarily be included in the scope of accreditation. Results relate only to the items tested and to all the items tested

10 CLIENT NAME: GEOKAMP LTD. PROJECT: 298 Caledon Villas SAMPLING SITE: PARAMETER Method Summary AGAT S.O.P AGAT WORK ORDER: 15T ATTENTION TO: BRUCE HEITKAMP SAMPLED BY:Bruce Hietkamp LITERATURE REFERENCE 5835 COOPERS AVENUE MISSISSAUGA, ONTARIO CANADA L4Z 1Y2 TEL (905) FAX (905) ANALYTICAL TECHNIQUE Water Analysis Chloride INOR SM 4110 B ION CHROMATOGRAPH METHOD SUMMARY (V1) Page 4 of 5 Results relate only to the items tested and to all the items tested

11 Page 5 of 5