CONQUEST ENGINEERING LTD.

Size: px

Start display at page:

Download "CONQUEST ENGINEERING LTD."

Winfred McKenzie
6 years ago
Views:

1 CONQUEST ENGINEERING LTD. Geotechnical and Materials Engineers Concrete Technology, Blasting Consultants Construction Quality Assurance / Quality Control 8 Bluewater Road, Bedford, NS BB J6 Phone (9)85-7 Fax (9)85-6 January 5, Mr. Leonard Avery, P.Eng. Heritage Gas -8 Brownlow Avenue Dartmouth, NS BB Y Dear Mr. Avery, Re: Geotechnical Investigation, Phase New Glasgow Pipeline Pictou County, Nova Scotia This is our report on the geotechnical investigation conducted for Phase (Boreholes to 7) for the proposed Natural Gas Pipeline in Pictou County, Nova Scotia. The subsurface conditions in the boreholes consisted of rootmat over compact to dense sandy silt till then bedrock (mudstone). Bedrock was encountered at each borehole with the exception of Borehole. The presence of bedrock at most borehole locations will complicate the proposed directional drilling. Table A: Summary of Findings Thickness of Borehole Rootmat/Topsoil Thickness of Till Bedrock Depth BH. >.8 >.8 Groundwater Depth* groundwater not encountered BH encountered at.6 m BH groundwater not encountered BH encountered at. m BH encountered at. m * encountered at the time of drilling. Actual groundwater depth may vary. Please contact us if you require additional information. Thank you, Glenn Graham, P.Eng. Geotechnical Engineer ggraham@conquest-eng.com Project No. 5- Saint John Moncton Bedford Fredericton Cornerbrook

2 TABLE OF CONTENTS page. INTRODUCTION.... SITE DESCRIPTION AND GEOLOGY.... SUBSURFACE CONDITIONS CLOSURE... TABLES Table A: Summary of Findings... APPENDICES APPENDIX A: BOREHOLE RECORDS TO 7 FIGURE : GRAIN SIZE DISTRIBUTION SOIL RESISTIVITY CERTIFICATE OF ANALYSIS DRAWING NO. BOREHOLE LOCATIONS Saint John Moncton Bedford Fredericton Cornerbrook Page i

The purpose of this investigation was to evaluate the subsurface conditions on the site, and to provide a factual report of our findings.

3 Proposed Natural Gas Pipeline, Pictou County, NS January 5, Leonard Avery P.Eng. Heritage Gas Project # 5-. INTRODUCTION We have conducted Phase of the Geotechnical Investigation for the proposed natural gas pipeline in Pictou County, NS at the request Heritage Gas. The purpose of this investigation was to evaluate the subsurface conditions on the site, and to provide a factual report of our findings.. SITE DESCRIPTION AND GEOLOGY Boreholes and are located at the crossing of Highway # in Alma, NS. Borehole 5 is located along the power transmission line right of way on top of MacDonald Hill. Boreholes 6 and 7 are located at the crossing for Middle River. Figure A shows an aerial view of Boreholes to 5. Figure B shows an aerial view of Boreholes 6 and 7. The borehole locations along the power transmission line right of way are predominantly cleared with some overgrown brush (alders) present. The borehole locations along Middle River were predominantly wooded. Access to the sites was through private properties. Bedrock was exposed in the locations for BH5 and BH7. Figure A: Borehole locations The principal soil type is sandy silt till over bedrock (mudstone) which is part of the Middle River Formation. Figure B: Borehole locations Saint John Moncton Bedford Fredericton Cornerbrook Page

4 Proposed Natural Gas Pipeline, Pictou County, NS January 5, Leonard Avery P.Eng. Heritage Gas Project # 5-. SUBSURFACE CONDITIONS The field program consisted of five boreholes (BH to BH7) completed on January 7 to January 9,. The borehole locations are shown in Figure A and Figure B (Figure in the appendix is a complete location plan). The boreholes were drilled using a track mounted drill rig. Representative samples were taken during the field work and the conditions at the boreholes were logged in detail. The soil and groundwater conditions encountered at the site are described in detail on the appended Borehole Records and summarized in the following paragraphs and Table A. The subsurface conditions in the boreholes consisted of rootmat over compact to dense sandy silt till then bedrock (mudstone). Bedrock was encountered at each borehole with the exception of Borehole. Groundwater was encountered in Boreholes, 5, and 6 at the time of drilling. Table A below lists the depths for each layer encountered. Grainsize analysis of one sample from Borehole showed 5% gravel, % sand, and 55% fines. One sample from Borehole 6 showed % gravel, 7% sand, and 5% fines. Moisture content analysis from Borehole ranged from.6% to 6.7%., with an average of.%. Moisture content analysis from Borehole 6 ranged from 6. % to 7.8%, with an average of.9%. Compressive strength analysis of the bedrock for two samples from Borehole 6 was.89 MPa, and.98 MPa. Laboratory analysis for electrical resistivity of two samples showed 667 Ω. cm, and 769 Ω. cm. Table A: Summary of Findings Thickness of Borehole Rootmat/Topsoil Thickness of Till Bedrock Depth BH. >.8 >.8 BH BH BH BH * encountered at the time of drilling. Actual groundwater depth may vary. Groundwater Depth* groundwater not encountered encountered at.6 m groundwater not encountered encountered at. m encountered at. m Saint John Moncton Bedford Fredericton Cornerbrook Page

Some variation between sampling locations should be expected. If the conditions encountered are significantly different than described in this report, we request that we be notified immediately.

5 Proposed Natural Gas Pipeline, Pictou County, NS January 5, Leonard Avery P.Eng. Heritage Gas Project # 5-5. CLOSURE If there are changes to the proposed work we require that we be notified to allow for review of our recommendations. A field investigation is a limited sampling of a site. Some variation between sampling locations should be expected. If the conditions encountered are significantly different than described in this report, we request that we be notified immediately. This report was completed for the sole benefit of Heritage Gas. Any other person or entity may not rely on this report without the express written consent of Conquest Engineering Ltd. This report was written by Glenn Graham, P.Eng. and reviewed by Bruce MacNeil, P.Eng. Glenn Graham, P.Eng Geotechnical Engineer ggraham@conquest-eng.com R. Bruce MacNeil, P.Eng Senior Geotechnical Engineer bmacneil@conquest-eng.com Saint John Moncton Bedford Fredericton Cornerbrook Page

6 APPENDIX A

7 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 7, Borehole No.: Page: of Date Drilled: Jan 7, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm ROOTMAT/TOPSOIL TILL: Compact to dense reddish brown sandy silt with gravel - trace cobbles

8 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 7, Borehole No.: Page: of Date Drilled: Jan 7, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm END OF BOREHOLE

9 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 8, Borehole No.: Page: of Date Drilled: Jan 8, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm ROOTMAT/TOPSOIL TILL: Compact to dense reddish brown sandy silt with gravel - trace cobbles mm BEDROCK: Mudstone mm 9 5-5mm END OF BOREHOLE groundwater at.6 m

10 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 8, Borehole No.: 5 Page: of Date Drilled: Jan 8, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm ROOTMAT/TOPSOIL TILL: Compact dark reddish brown sandy silt with gravel - some cobbles/boulders inferred by augering performance 5-75mm BEDROCK: Mudstone with conglomerate - some cobbles/boulders inferred by augering performance 5-mm END OF BOREHOLE groundwater not observed

11 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 8, Borehole No.: 6 Page: of Date Drilled: Jan 8, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm ROOTMAT/TOPSOIL TILL: Compact to dense reddish brown sandy silt with gravel - trace cobbles - trace boulders augered through cobbles/boulders mm - augered through cobbles/boulders BEDROCK: Mudstone 5-5mm NQ 6 5 %

12 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 8, Borehole No.: 6 Page: of Date Drilled: Jan 8, Datum: Assumed Depth Water Level Sample Type Sample Number 6 Recovery (mm) N Value or RQD % % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm NQ 7 7% END OF BOREHOLE groundwater at. m

13 Conquest Engineering Ltd. BOREHOLE RECORD Project Name: Proposed Natural Gas Pipeline - Phase Project No.: 5- Client: Heritage Gas Location: Pictou County, Nova Scotia Water Level Date: Jan 9, Borehole No.: 7 Page: of Date Drilled: Jan 9, Datum: Assumed Depth Water Level Sample Type Sample Number Recovery (mm) N Value or RQD % Symbols SOIL AND/OR ROCK DESCRIPTION Elevation Moisture Content (%) Wp ---O--- WL SPT (N) Blows/mm ROOTMAT/TOPSOIL TILL: Compact to dense reddish brown sandy silt with gravel - trace cobbles BEDROCK: Mudstone and conglomerate 5 NQ 5 % - splitspoon attempted with no recovery after 5 blows 6 NQ 5 % 7 - splitspoon attempted with no recovery after 5 blows 8 END OF BOREHOLE groundwater at. m 9 5

14 GRAIN SIZE DISTRIBUTION PLOT % 9% 8% 7% Percent passing 6% 5% % % % % %.. Grain Size (mm) Coarse GRAVEL Fine SAND Coarse Medium Fine SILT & CLAY SAMPLE ID DEPTH SYMBOL CLAIFICATION (ASTM D87 USCS) GRAVEL (%) SAND (%) FINES (%) BH, Sa - Sandy SILT with gravel (ML) 5% % 55% BH6, Sa - Sandy SILT with gravel (ML) % 7% 5% #N/A #N/A #N/A #N/A #N/A #N/A Sample Type : Borehole Samples Sample Location : Borehole BH,and BH6 Comments : Client : Heritage Gas Project : Proposed Natural Gas Pipeline Project No. : 5- Figure

15 Attention: Glenn Graham Conquest Engineering Ltd 8 Bluewater Road Bedford, NS CANADA BBJ6 Your P.O. #: 5- Your Project #: 5 Site Location: DARTMOUTH BRIDGE TERMINAL Your C.O.C. #: N/A Report Date: // CERTIFICATE OF ANALYSIS MAXXAM JOB #: B98 Received: //, 5:58 Sample Matrix: Soil # Samples Received: Date Date Method Analyses Quantity Extracted Analyzed Laboratory Method Reference Conductance - soil // // ATL SOP 6 Based on SM5B Remarks: Reporting results to two significant figures at the RDL is to permit statistical evaluation and is not intended to be an indication of analytical precision. * RPDs calculated using raw data. The rounding of final results may result in the apparent difference. Encryption Key Please direct all questions regarding this Certificate of Analysis to your Project Manager. Mari Kenny, Project Manager MKenny@maxxam.ca Phone# (9) - Ext:9 ==================================================================== Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section 5.. of ISO/IEC 75:5(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page. Total cover pages: Page of 6

16 Conquest Engineering Ltd Maxxam Job #: B98 Client Project #: 5 Report Date: // Site Location: DARTMOUTH BRIDGE TERMINAL Your P.O. #: 5- Sampler Initials: GG RESULTS OF ANALYSES OF SOIL Maxxam ID QH9965 QH9966 Sampling Date // // COC Number N/A N/A Inorganics Units BH BH7 RDL QC Batch Conductivity us/cm 5. 7 N/A = Not Applicable RDL = Reportable Detection Limit QC Batch = Quality Control Batch Page of 6

17 New Glasgow Steel Pipeline Proposed Boreholes December, Hole ID Feature Hole Location Access via Tree / Alder clearing * Approx. Mimimum Hole Depth Northing ** Easting ** BH Stream crossing West side BH Stream crossing East side BH BH Hwy, Stream, Salem Hill Hwy, Stream, Salem Hill 5m west of Hwy 5m east of Hwy Woods Rd off east side of "West River East Side Rd" to powerline access road Woods Rd off north side of Tanner Hill Rd, up to powerline, then west on powerline access road Woods Rd off north side of Tanner Hill Rd, up to powerline, then east on powerline access road Driveway off east side of "Hwy " (under south wire of powerline).5m xm alders m x 5m alders m x m alders None required BH 5 Hwy, Stream, Salem Hill m east of Hwy (Top of hill south side of powerline) 6 BH 6 Middle River West side of River 7 BH 7 Middle River East side of River 8 BH 8A CB&CNS Railway 7m east of Granton Rd railway crossing Farmers field access off west side of Macdonald Hill Rd Civic 577 driveway off north side Hwy, after white barn turn right, go 75m, follow pink ribbon Daisy Lane off north side Hwy, left at cemetery, right onto driveway, go past mini home, stay right Possibly see if CB&CNS will allow to use tracked vehicle down beside railway tracks.5m x 5m alders m x 5m alders, few small trees m x m alders m x m alders, few small trees BH 8C Stream crossing West side Hwy 6, north of pond Woods Rd off west side Hwy 6.5m x m alders BH 9 Stream crossing BH BH Hwy 6 & CB&CNS Railway crossings Abercrombie Rd & Begg Brook West side Hwy 6, south side of Begg Brook West side Hwy 6, north side of CB&CNS Railway in grassy area South side of Abercrombie Rd, west side CB&CNS Railway, across from Northern Pulp truck entrance just inside tree line Woods Rd off west side Hwy 6, follow along tree line, turn in and follow flags.5m x m alders 5556 Off Hwy 6 on ramp, Exit None required South side of Abercrombie Rd, between Exit off ramp and Railway crossing 5m x m * NOTE : Approximate mimimum borehole depth is given as an estimate of the variance in elevation between the ground surface at the borehole location and the low point of the feature that is being crossed added to the numbers as shown in section 6.. of t ** NOTE : Northing and Easting refers to the deg MTM, ATS 77 projection.

CONQUEST ENGINEERING LTD.

CONQUEST ENGINEERING LTD. Geotechnical and Materials Engineers Concrete Technology, Blasting Consultants Construction Quality Assurance / Quality Control 8 Bluewater Road, Bedford, NS BB J6 Phone (9)85-7