AECOM 201 – 3275 Lakeshore Road 250 762 3727 tel Kelowna, BC, Canada V1W 3S9 250 762 7789 fax www.aecom.com

Technical Memo

December 17, 2010

Alfred Hartviksen

Engineer

Regional District Okanagan-Similkameen

101 Martin Street

Penticton, BC V2A 5J9

Dear Alfred Hartviksen:

Project No: 60189422 Regarding: Faulder Water System – Development of a Ranney-type Well

1.1 Introduction

The Regional District of the Okanagan-Similkameen (RDOS) contacted AECOM to complete a conceptual cost estimate for the development of a Ranney-type1 well system adjacent to Trout Creek. The Ranney-type well is an option being considered for the supply of potable water to the community of Faulder. The Faulder water system services approximately 80 residents and consists of a groundwater well that pumps water through the distribution network to a 113 m3 storage reservoir located approximately 1350 metres from the well along the Princeton Summerland Road. Previous water quality testing at the existing groundwater well indicates that the well water has uranium concentrations greater than the maximum allowable concentration (MAC) of 0.02 mg/L, as defined in the Guidelines for Canadian Drinking Water Quality (GCDWQ). To improve the quality and reliability of the community’s drinking water a new supply or treatment of the existing source is required.

The District of the Okanagan-Similkameen recently began actively pursuing the option of purchasing and conveying treated water from Summerland to service the Faulder water system. Recent increases in the estimated capital cost to complete this option precipitated the RDOS request for AECOM to conduct a more detailed review and capital estimate of a Ranney-type well in Faulder. The purpose of this letter is to provide a conceptual level review and cost estimate to develop a Ranney-type well adjacent to

1 A shallow groundwater well situated within the hydraulic influence of a surface body of water.

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Trout Creek and the water treatment processes required to satisfy the local governing authorities.

1.2 Meeting the Treated Water Quality Goals

The treatment options presented for the development of a Ranney-type well are based on ensuring Faulder can meet the current and expected Guidelines for Canadian Drinking Water Quality and the Interior Health 4-3-2-1-0 drinking water quality objectives. The Interior Health requirements are:

4 – log virus inactivation;

3 – log Cryptosporidium and Giardia removal/inactivation;

2 denotes the need for two treatment processes for all surface water sources;

1 refers to ensuring a turbidity of less than 1 NTU at the customers tap; and

0 refers to no bacteria, either Fecal Coliform or E.Coli bacteria being within the drinking water supply.

Given the nature of a Ranney-type well, it is likely that the source water would be classified as a groundwater under the direct influence of surface water (GUDI). However, the need for filtration, as per the US EPA LT2ESWTR2, will vary depending on the exact location of the Ranney-type well relative to Trout Creek and the turbidity of the water. If the turbidity of the water diverted from the Ranney-type is less than 1 NTU than filtration could be avoided and treatment provided with 2-stage disinfection. If the well turbidity is greater than 1 NTU filtration will need to be added to the treatment process train.

1.3 Development of a Ranney-type Well

A Ranney-type well consists of multiple subsurface infiltration galleries situated within the hydraulic influence of a surface body of water. The infiltration galleries collect the subsurface water and then convey the water to a central location where a caisson type wet well is used for storage and pumping. Ranney-type wells are well suited for collecting groundwater where shallow high yielding aquifers are present. Though Trout Creek may not be considered a large body of water, the creek maintains a steady stream flow throughout the year. Data from the Gibbs and Faulder well logs indicate sand and gravels seams between 2.1 metres – 2.7 metres and 3.7 metres – 5.5 metres. For the purposes of this analysis, it was assumed that the sand and gravel seam located between 3.7 metres – 5.5 metres is a saturated aquifer with hydraulic connectivity to the Trout Creek surface water source.

It is expected that the water collected by the Ranney-type well will have similar water quality characteristics as the Trout Creek water source. One potential benefit of the Ranney-type well is that turbidity of raw water may be reduced to below 1 NTU as it travels through sand and gravel seam toward the infiltration gallery. Given the limited amount of hydrogeological data in this area we cannot infer that the quality of the water will be either less than or greater than 1 NTU. We have therefore considered two potential treatment process trains for the Ranney-type well.

2 US EPA. 2009. Long Term 2 Enhanced Surface Water Treatment Rule Toolbox Guidance Manual-Review Draft.

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The two (2) process trains are as follows:

Option A – 1.1 ML/d Ranney-type groundwater well, UV radiation, chlorine disinfection with bulk sodium hypochlorite, and a 15 m3 wetwell. This option would be possible if the groundwater turbidity is found to be less than 1 NTU. A process schematic of the option is shown below in Figure 1.

Figure 1 - Option A: Shallow Ground Well with Disinfection

Option B – 1.1 ML/d Ranney-type groundwater well, membrane filtration, provision for coagulation, UV radiation, chlorine disinfection with bulk sodium, a 15 m3 wet well, and 1100 m2 residuals handling lagoons. This is the preferred option if the groundwater turbidity is found to be greater than 1 NTU. A process schematic of the option is shown in Figure 2.

Figure 2 - Option B: Shallow Ground Well with Filtration and Disinfection

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The development of the above treatment process trains are based on the following assumptions:

Both treatment trains are sized to meet the maximum daily demand of 13 L/s.

The Ranney-type well is located on the existing Faulder groundwater well property.

The infiltration gallery is setback approximately 8 metres from top of bank of Trout Creek at a depth of 5.5 metres.

Hydraulic conductivity (K) of the sand and gravel seam is greater than 6.1 m/day.

The membrane filtration process would include a skid mounted membrane micro/ultra filtration system complete with instrumentation, clean-in-place, backwash, and enhanced backwash systems.

The residuals management for the filtration process would consist of a lagoon/wetland. Given the increase infrastructure required for the residual management system additional land will be required for this option.

Both options include a 15 m3 wetwell sized to provide sufficient chlorine contact time during the maximum daily demand at 5°C to achieve 0.5 log removal of Giardia3.

The existing groundwater well would remain active to provide a back-up water source. The potential of blending the existing well water with the Ranney-type well was not considered due to the limited impact to the capital cost given the scale of proposed treatment processes.

1.4 Capital Cost Estimate

Attached are the current capital cost estimates to construct a Ranney-type well for Faulder. The estimated capital costs are as follows:

Option A: Ranney-type well with 2-stage disinfection in the amount of $ 984,500.

Option B: Ranney-type well with filtration and disinfection in the amount of $ 1,901,100.

The capital cost estimates include an allowance of 15% for Professional Services and 20% Construction Contingency. The impact of HST is not included in the capital cost estimates.

The estimates of probable costs have been prepared using prices obtained from major suppliers and from data in AECOM’s possession from projects similar in nature and scope. However, the actual cost may be significantly affected by a number of factors, the cost implications of which cannot be readily forecast. These include factors such as the results of the geotechnical/hydrogeological study, volume of work in hand or in prospect for contractors and suppliers at the time of tender calls, future labour contract settlements, inflation and market escalation. For this reason, while the estimate has been carefully prepared by competent personnel, the actual costs may be above or below those outlined.

1.5 Conclusions and Recommendations

3 Log removal of Giardia was calculated using the EPA Disinfection Guidelines

Faulder Water SystemDevelopment of Shallow Well Adjacent to Trout Creek

Job No. 60189422Conceptual Cost Estimate Option A - Shallow Well with UV and Hypochlorite Disinfection 08-Dec-10

Item Description Quantity Unit Unit ExtensionPrice ($)

1.0 General Conditions1.1 Mobilization / Demobilization (5% of Subtotal) LS 1 $30,000 $30,0001.2 Insurance LS 1 $30,000 $30,000

2.0 Hydrogeoligical Investigation and Test Well Program2.1 Shallow Well Feasability Study/Investigation LS 1 $60,000 $60,0002.2 Test Well Drilling Program LS 1 $140,000 $140,000

3.0 Permits and Approvals3.1 Ministry of Environment - Environmental Assessment LS 1 $20,000 $20,0003.2 Department of Fisheries LS 1 $5,000 $5,0003.3 IHA Groundwater Protection Plan LS 1 $15,000 $15,0003.4 Full time Environmental Monitoring (During Construction) LS 1 $20,000 $20,000

4.0 Site Works4.1 Excavation for Infiltration Gallery (Reuse backfill) cu.m. 1,800 $35 $63,0004.2 Washed Rock (50mm) cu.m. 50 $40 $2,0004.3 Site Fencing (part of GW protection plan) l.m. 105 $150 $15,8004.4 Silt Fence Allowance LS 1 $1,500 $1,5004.5 Temporary De-watering Allowance LS 1 $15,000 $15,0004.6 Infiltration gallery piping (200mm slotted PVC piping) l.m. 25 $200 $5,000

5.0 Well Development5.1 Well Caisson (1.5m Drywell Barrels) l.m. 8 $1,000 $8,0005.2 2Hp Well Pump and Piping (1 @ 12.5 L/s @ 8m of Head) LS 1 $12,000 $12,000

6.0 Building (5m x 3m Building)6.1 Masonry Block m2 56 $450 $25,2006.2 Wetwell Walls m3 11 $1,100 $11,9006.3 Wetwell Slab m3 4 $1,100 $4,0006.4 Main Floor Slab m3 5 $1,100 $5,0006.5 Roof (steel truss, q-deck, and metal cladding) m2 15 $170 $2,6006.6 Doors, hatches, windows, etc. LS 1 $10,000 $10,000

7.0 Process Equipment7.1 Mechanical Piping LS 1 $20,000 $20,0007.2 Bulk Hypochlorite Disinfection LS 1 $3,500 $3,5007.3 UV Disinifection LS 1 $70,000 $70,0007.4 Treated Water Pumps (2-20Hp Pumps) ea. 2 $35,000 $70,000

8.0 Electrical and Instrumentation (25%) LS 1 $50,000 $50,000

9.0 Building Mechanical (5%) LS 1 $15,000 $15,000

Subtotal 729,500$ Engineering (15%) 109,000$ Construction Contingency (20%) 146,000$ TOTAL ESTIMATED CAPITAL COST 984,500$

Faulder Water SystemDevelopment of Shallow Well Adjacent to Trout Creek

Job No. 60189422Conceptual Cost Estimate Option B - Shallow Well with Filtration, UV and Hypochlorite Disinfection 08-Dec-10

Item Description Quantity Unit Unit ExtensionPrice ($)

1.0 General Conditions1.1 Mobilization / Demobilization (5% of Subtotal) LS 1 $30,000 $30,0001.2 Insurance LS 1 $30,000 $30,0001.3 Land Purchase LS 1 $100,000 $100,000

2.0 Hydrogeoligical Investigation and Test Well Program2.1 Shallow Well Feasability Study/Investigation LS 1 $60,000 $60,0002.2 Test Well Drilling Program LS 1 $140,000 $140,000

3.0 Permits and Approvals3.1 Ministry of Environment - Environmental Assessment LS 1 $20,000 $20,0003.2 Department of Fisheries LS 1 $5,000 $5,0003.3 IHA Groundwater Protection Plan LS 1 $15,000 $15,0003.4 Full time Environmental Monitoring (During Construction) LS 1 $20,000 $20,000

4.0 Site Works4.1 Excavation for Infiltration Gallery (Reuse backfill) cu.m. 1,800 $35 $63,0004.2 Washed Rock (50mm) cu.m. 50 $40 $2,0004.3 Site Fencing (part of GW protection plan) l.m. 105 $150 $15,8004.4 Silt Fence Allowance LS 1 $1,500 $1,5004 5 Temporary De-watering Allowance LS 1 $15 000 $15 0004.5 Temporary De-watering Allowance LS 1 $15,000 $15,0004.6 Infiltration gallery piping (200mm slotted PVC piping) l.m. 25 $200 $5,0004.7 Residuals Pond Excavation (1000m2 Settling Pond) LS 1 $90,000 $90,000

5.0 Well Development5.1 Well Caisson l.m. 8.0 $1,000 $8,0005.2 6 Hp Well Pump and Piping (14 L/s @ 26m of Head) LS 1 $15,000 $15,000

6.0 Building (5m x 8m Building)6.1 Masonry Block m2 91 $450 $41,0006.2 Wetwell Walls m3 13 $1,100 $13,9006.3 Wetwell Slab m3 4 $1,100 $4,4006.4 Main Floor Slab m3 12 $1,100 $13,2006.5 Roof (steel truss, q-deck, and metal cladding) m2 40 $170 $6,8006.6 Doors, hatches, windows, etc. LS 1 $15,000 $15,000

7.0 Process Equipment7.1 Mechanical Piping LS 1 $35,000 $35,0007.2 Bulk Hypochlorite Disinfection LS 1 $3,500 $3,5007.3 UV Disinifection LS 1 $70,000 $70,0007.4 Treated Water Pumps (2-20Hp Pumps) ea. 2 $35,000 $70,0007.5 Micro/Ultra Membrane Filtration LS 1 $350,000 $350,0007.6 Coagulation LS 1 $15,000 $15,000

8.0 Electrical and Instrumentation (25%) LS 1 $110,000 $110,000

9.0 Building Mechanical (5%) LS 1 $25,000 $25,000

Subtotal 1,408,100$ Engineering (15%) 211,000$ Construction Contingency (20%) 282,000$ TOTAL ESTIMATED CAPITAL COST 1,901,100$