16-03-06-13W2 SPILL 20140703.Pdf
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October 6, 2014 Matrix 19845-523 Ms. RaeLynn Spencer CENOVUS ENERGY INC. 500 Centre Street SE Calgary, Alberta T2P 0M5 Subject: 16-03-006-13 W2M, July 3, 2014 Spill, 90-day Report Dear Mr. Harrison: 1 INTRODUCTION On July 3, 2014, Cenovus Energy Inc. commissioned Matrix Solutions Inc. to provide assistance with a produced water spill at the surface location 16-03-006-13 W2M. The spill occurred on July 3, 2014, and was caused by flowline failure originating at 01/05-24-006-14 W2M and terminating at the 01/08-23-006-14 W2M remote header. This report summarizes initial spill release information, field activities, and soil sample results. 1.1 Program Summary Results of remediation activities associated with the emulsion spill are: • The spill event involved the release of 34 m3 of emulsion. • The total spill area measured 997 m2 (972 m2 within lease boundaries and 25 m2 outside lease boundaries). • A total of 851.3 tonnes of soil and 69 m3 of fluid were removed from the spill area and transported offsite for disposal. • Soil analytical results demonstrated: electrical conductivity (EC) levels and sodium adsorption ratio (SAR) values range from below to above applicable guidelines petroleum hydrocarbons (PHC) including benzene, toluene, ethylbenzene, and xylenes (BTEX) concentrations below applicable guidelines total extractable hydrocarbon (TEH) C11-C22 and C23-C60 concentrations below applicable guidelines 1780 Railway Avenue Phone: 306.842.3088 Fax: 306.842.3356 Weyburn, Saskatchewan, Canada S4H 2K1 www.matrix-solutions.com 19845-523 20140703 LR 2014-10-06 final 2 BACKGROUND Site and spill information is summarized below in Table A. A site location map (Figure 1), area plan (Figure 2), site plan (Figure 3), spill area excavation detail (Figure 4), flowline excavation detail (Figure 5), and site photographs (Appendix A) are attached for reference. Table A Site and Spill Information Spill Date July 3, 2014 Legal Land Description 16-03-006-13 W2M Site Location 6.4 km north and 3 km east of Goodwater, Saskatchewan Land Use Category Pasture Local Topography Gentle slopes less than 5%, mostly between 2% and 5% (SKCSR 1997) Potential Receptors Cattle Land Ownership Freehold and deeded Her Majesty the Queen, Right of Canada, and is located in Agriculture and Agri-Food Canada pasture land (AAFC). AAFC representative Mr. Jim Wickenheiser can be contacted at 306.861.1994. Facilities Onsite Abandoned Injection well and abandoned carbon dioxide injection well Spill Substance Produced water Type of Impact Sodium and chloride (produced water) Release Volume 35 m3 Area of Impact 997 m2 Onlease/Offlease Within lease boundaries: 972 m2 Outside lease boundaries: 25 m2 Fluid Transferred for Disposal 69 m3 to Newalta Corporation Soil Transferred for Disposal 851.30 tonnes to Tervita Corporation 3 PROGRAM OBJECTIVES AND SCOPE OF WORK The objectives of the field program were to document site conditions, assess the spill area, and supervise equipment during spill remediation. To meet the objectives, the scope of work included: • documenting site conditions and obtaining photographs • obtaining GPS data of the spill area and site features • collecting water samples from the standing water in the ditch for the purpose of field-screening • collecting soil samples from the spill area, flowline excavation, stockpiles and background location for the purpose of field-screening and laboratory analysis • supervising equipment during spill remediation • submitting samples for laboratory analysis for the following parameters: detailed salinity including pH, EC, SAR, and major anions and cations petroleum hydrocarbons (PHC) including BTEX and TEH C11-C22 and C23-C60 available nutrients and cation exchange capacity (CEC) Saskatchewan Class II landfill waste characterization • preparing a report summarizing field activities, field data and soil sample analytical results with respect to applicable regulatory guidelines 19845-523 20140703 LR 2014-10-06 final 2 Matrix Solutions Inc. 4 METHODS 4.1 Safety Matrix personnel were required to comply with legislated, Matrix, and Cenovus health and safety standards. A tailgate safety meeting was conducted prior to the start of work each day. Safety items reviewed included the scope of work, hazard identification analysis, personal protective equipment, safety certificates and documents, required permits, and the emergency response plan. Ground disturbance was prepared and supervised by Cenovus personnel. 4.2 Surface Water Sampling Matrix personnel collected all surface water samples in accordance with Matrix’s standard operating guidelines. Surface water samples were field-screened for chlorides using high and low range QuanTab® chloride titrators. 4.3 Soil Sampling Soil samples were collected in consultation with Matrix’s standard operating guidelines and submitted to Access Analytical Laboratory Inc. in Calgary, Alberta, for analysis. The soil samples were field-screened for chlorides using high range QuanTab® chloride titrators and CVC values were measured in the headspace of sealed sample bags using an Eagle model portable gas detector manufactured by RKI Instruments, Inc. 5 FIELD PROGRAM On July 3, 2014, Matrix personnel documented site activities, mapped the spill area with a Trimble® submetre accurate GPS unit, and obtained photographs of the spill area. Matrix collected and field-screened five surface water samples (14-SW1 through 14-SW5) from standing water within a ditch along the access road (Figure 3; Table 1). Matrix supervised a Brady Oilfield Services L.P. vac truck remove free-fluid from the spill area and ditch. Brady’s transported 9 m3 of fluid to Newalta’s disposal facility located near Halbrite, Saskatchewan. Waste receipt summaries are provided in Appendix B. Matrix and Cenovus supervised a Carson Energy Services Ltd. hydrovac remove 20 m3 of impacted soil and water from the bellhole formed at the breakpoint on the flowline. Impacted material was transported to Newalta for disposal. Carson’s installed a temporary electric fence around the lease and spill area to prevent cattle from entering the area. 19845-523 20140703 LR 2014-10-06 final 3 Matrix Solutions Inc. On July 4, 2014, Matrix and Cenovus supervised a Carson rubber tire backhoe construct a clay berm in the ditch to separate impacted surface water from non-impacted surface water. The clay was sourced from a Brady’s clay pit located at SW ¼ 14-006-14 W2M. Matrix collected and field-screened eight surface water samples (14-SW1 through 14-SW4 and 14-SW6 through to 14-SW9) from the standing water on each side of the clay berm to examine the integrity of the clay berm (Figure 3; Table 1). A Brady vac truck and body tank truck removed the remaining 40 m3 of impacted surface water from the ditch area and transported it to Newalta for disposal. Matrix collected and field-screened 50 soil samples (14-H101 through 14-H125) to delineate and characterize impacts (Figure 3; Table 2). Background samples (14-H26) were collected and sent to Access labs for detailed salinity and nutrient analysis. Carson’s reinforced the electric fence, and a temporary Texas gate was installed on the lease road leading to the lease pad. On July 9, 2014, Matrix personnel were onsite with a Carson’s crew to segregate impacted material during the flowline and spill area excavations. Matrix collected and field-screened soil samples 14-X101 through 14-X108 from the base and walls of the flowline repair excavation (Figure 5; Table 2). Select samples were sent to Access for analysis of salinity and hydrocarbon parameters Composite soil samples were collected from the non-impacted stockpiled material (14-S1 and 14-S2) and sent to Access for analysis of detailed salinity and hydrocarbon parameters, which was used for the purpose of backfilling the excavation. A composite soil sample (14-S3) was collected from the impacted stockpiled material and sent to Access for analysis of Saskatchewan Class II landfill characterization. On July 10, 2014, Matrix personnel were onsite with a Carson’s crew to guide the spill area excavation. Matrix collected soil samples from the perimeter of the spill area (14-H1 through to 14-H14; Figure 3) and from within the spill area excavation (14-X1 through to 14-X17; Figure 4) and field screened for CVCs and chlorides (Table 2). Select samples were sent to Access for analysis of salinity and hydrocarbon parameters. On July 16, 2014, Matrix personnel were onsite with a Carson’s crew and Brady’s trucks to continue excavate additional impacted material in the line and spill area excavations represented by samples 14-X12, 14-X14, and 14-X102. Brady’s transported 644.57 tonnes of impacted material to Tervita’s landfill facility, located near Colgate, Saskatchewan. Matrix collected soil samples from within the flowline excavation (14-X102; Figure 5) and from within the spill area excavation (14-X117 through to 14-X121; Figure 4). Samples were field-screened for CVCs and field chlorides (Table 2). On July 17, 2014, Matrix personnel were onsite with Carson’s crew and Brady’s trucks to finish removing the impacted material stockpiled on site. Brady’s transported 206.73 tonnes to Tervita for disposal. Matrix recollected soil samples 14-X12, 14-X14, and 14-X17 (Figure 4) from within the spill area excavation. Samples were field-screened for CVCs and field chlorides (Table 2). Based on field-screening select samples were sent to Access for analysis of salinity and hydrocarbon parameters. 19845-523 20140703 LR 2014-10-06 final 4 Matrix Solutions Inc. The flowline excavation was backfilled by a Carson’s crew under the supervision of a Cenovus consultant. On July 24, 2014, Matrix personnel were onsite with a Jerry Mainil Limited crew and Brady’s trucks to amend and backfill the spill area excavation. A total of 100 lbs of qypsum was applied to the base of the spill area excavation prior backfill the area with 264 tonnes of clay and 504 tonnes of topsoil sourced from Brady’s borrow pit located at SW ¼ 14-006-14 W2M.