· based on the water well log (wtn 53492), the on-site well is 81 feet deep and the depth to...

28049 Myrtle Ave, Abbotsford, BC V4X 2P5 Phone: (604) 807-1712 Fax: (604) 626-4980 www.arden-engineering.com

March 13, 2014 Gursimer Holdings Ltd File 15-14 4974 Kingsway Burnaby, BC V5H 4M9 Attention: Nirvair Bagri: Re: Proposed Re-Zoning of 29550 & 29560 Lougheed Highway, Mission BC ___________________________________________________________________

Further to your request, Arden Consulting Engineers Ltd. (ACE) has completed a limited review and assessment of the subsurface conditions at 29550 and 29560 Lougheed Highway, Mission, BC for the purpose of assessing the parcel’s ability to support an onsite wastewater treatment system and groundwater supply for a proposed commercial development.

BACKGROUND

Both subject properties are currently developed with older residences that are no longer occupied. Future development may include the following facilities:

24 hour fast food restaurant with seating for up to 30 persons; A gas station with 6 pumps and a convenience store Coffee shop Commercial retail

The corresponding design flow rate for the future development is summarized in the table below.

Table 1- Design Flow Summary

Item units # of units Flow per unit (L)Flow (L/day)Fast Food Restaurant seat 30 200 6,000

employees 20 68 1,360Subtotal 7,360C-Store

employees 6 68 408Gas pumps 6 1,000 6,000

Subtotal 6,408Commercial Retail

employees 10 75 750

m2 706 5 3,530Subtotal 4,280Total 18,048

The total design flow rate for the proposed development is 18 m3/day and accordingly, the discharge would be governed by the Sewerage System Regulation (SSR) administered by the Fraser Health Authority (FHA).

The collective area of the two parcels is approximately 2.1 acres. Both parcels were serviced by private wells. The locations of the existing wells are shown on the attached site plan. It is noted that the existing wells may not necessarily be retained. Sanitary sewer is not available and therefore both lots will need to be serviced by an onsite wastewater treatment or septic system. The property slopes to the west (towards Saint Anthony’s Way) at a slope of approximately 15%. The subject parcels are bounded by the Lougheed Highway to the east and north and Saint Anthony’s Way to the west as well as two residential lots to the south. There are no surface water courses, ponds, wetlands, springs or drainage ditches visible on the property. Other than the setback distance to the private wells servicing the neighboring residential lots to the south, there are no physical site constraints on either subject parcel that would affect the location of a future septic system.

SUBSURFACE INVESTIGATION FOR SEWAGE DISPOSAL

A limited subsurface investigation was conducted by ACE on March 10, 2015 for the purpose of evaluating the subsurface conditions and each parcel’s ability to support an onsite sewage disposal system to service the proposed development. Ten testpits were advanced using a small tracked excavator to depth of approximately 1500mm Below Ground Surface (BGS) and the subsurface conditions were logged by a member of our engineering staff. Three testpits were advanced at 29550 Lougheed Highway and seven were advanced at 29560 Lougheed Highway. The test pits were then back filled for safety reasons. Additionally, eight percolation tests were performed to assess the soil permeability. The percolation holes were presoaked prior to timing. The test pit locations were chosen to provide coverage of all areas on both properties as there were no physical site constraints that would prohibit construction of a septic system. The locations of the test pits and percolation tests were recorded by GPS and their approximate locations are shown on the attached site plan. All of the test pits advanced were suitable for effluent dispersal under the SSR. No seepage, water table or restrictive layer was encountered at depths of up to 1.5m. In general the subsurface conditions consisted of the following subsurface conditions:

0-400mm Silty Sand, brown loose, organics (Topsoil) 400-1500mm Sand and Gravel, some silt, frequent cobbles, occasional boulders

(sub rounded), brownish grey, medium dense, moist

Detailed logs of the test pits are attached. The percolation test results are presented in Table 2 below.

Table 2- Percolation test Results

Perc Hole # Rate

(min/inch)Depth Below Ground Surface

(mm) 1 3 470 2 2 500 3 7 450 4 4 450 5 5 430 6 1.5 430 7 2 450 8 2.5 480

The average percolation rate is 3.5 minutes per inch and is considered very favorable for effluent dispersal.

Options for Effluent Dispersal

Given that there are limited site constraints on both lots affecting the location of a future septic system, the effluent dispersal field could be located anywhere on either parcel provided that it is outside the 30m setback to any water wells. Given the relatively high design flow and the high percentage of proposed hard surfacing, it is likely that Type 2 or 3 effluent will be required to reduce the effluent dispersal area. Type 2 effluent is treated by a sewage treatment system to achieve the following standards:

Biochemical Oxygen Demand (BOD5) < 45mg/L

Total Suspended Solids (TSS) <45 mg/L.

Type 3 effluent is required to meet the following standards:

Biochemical Oxygen Demand (BOD5) < 45mg/L

Total Suspended Solids (TSS) <45 mg/L.

Fecal coliform bacteria < 400 CFU per 100mL

It will be necessary to orient the longitudinal axis of the effluent dispersal area parallel to the contour lines. Given the slope of the property (15%) a long narrow configuration is required. ACE has calculated the area required for the effluent dispersal field based on the projected design flow rate and Type 2 or 3 effluent.

Table 3 – Summary of Area Required for Effluent Dispersal

Design Flow (Lpd) Area required

Type 2 (m2)

Area required

Type 3 (m2) Proposed Facilities for both lots (18,000 Lpd) 277 (3m x 92m) 180 (3m x 60m)

Proposed Facilities for 29550 Lougheed Hwy (6,408 Lpd) 99 (3m x 33m) 64 (3m x 22m)

Proposed Facilities for 29560 Lougheed Hwy (11,640 Lpd) 180 (3m x60m) 116 (3m x 39m)

The required area for a Type 3 system for the full design flow rate (includes facilities for both lots) is shown on the attached site plan.

GROUNDWATER SUPPLY AND AQUIFER IMPACT ASSESSMENT

There is an existing groundwater supply well located on the property as shown on the attached Site Plan. A search of the BC Water Resource Atlas (BCWRA) revealed eight existing wells within 250m of the Site. The records for these wells are attached, as downloaded from the provincial WELLS1 database. A summary of the wells is provided in the following table. Table 4 – Well Summary

Address/Owner Well Tag Number

Yield (USgpm)

Well Depth(ft)

Depth to Water

(ft)

Distance to Site Well (m)

Donatelli Rd 1911 0 17 14

Mclean Rd 9333 0 15 Unknown 100

Hayward Rd 9925 0 5 Unknown

Hayward Rd 10143 0 0 Unknown 90

J B Bondethelu 10193 0 8 Unknown

Hayward Rd 15452 0 25 10

29550 Lougheed Hwy 53492 20 81 4.7 Site Well

Hayward Rd 78596 6.5 229 47

29543 Donatelli 101135 10 77 Unknown 77

These well locations are shown on the attached site plan. The locations of the surrounding wells are shown on the attached MAPSBC Well Location Map. Note that the locations of the well noted in the MAPSBC database are not always accurate, and provide a general indication of the well locations in the area. As such, the locations of the wells closest to the subject Site were measured from known parcel boundaries of the subject lot or recorded by GPS. It is noted that only the well located at 29543 Donatelli Avenue affects the positioning of a future effluent dispersal area. The 30m setback distances are plotted on the attached site plan. This well is also the closest to the existing production well at 29550 Lougheed Highway. Based on the water well log (WTN 53492), the on-Site well is 81 feet deep and the depth to water is 1.44m. This well was drilled in 1984 and was used for domestic water supply. Based on the age of the well, it is not likely completed with a surface seal in accordance with the Groundwater Protection Regulation. The driller's estimate of flow was 20 gpm. The production zone appears to be confined as the well is completed below a layer of cemented sand and gravel. WTN 10135 located at 29543 appears to be completed within the same production zone as the on-Site well. This well log indicates it is completed below a layer of clay near the ground surface.

1 WELLS - http://www.env.gov.bc.ca/wsd/data_searches/wells/index.html

Several shallow wells are also located in the vicinity. Review of the Surficial Geology Map 1485a indicates that the subject Site is underlain by Sumas Drift, which consists of recessional channel and floodplain deposits between 5 and 25m in average thickness. These deposits extend to the north. Wells completed in this aquifer appear to be very productive. To the west, the geology consists of sandy till and sub-stratified drift, 2 to 10m in thickness and lacustrine silt and clay between 5 and 35m in thickness. Further east Tertiary bedrock is indicated and is mantled by glacial drift. Wells in this area are not very productive. The well log for WTN 78596 represents the stratigraphy described above. The location of the subject Site is within a boundary area of a relatively productive aquifer to the west and a lower productivity aquifer to the east. Elements of the surficial geology described above are present in both of the deep drilled wells in this area. The estimated flow required for the proposed development is 18,000 Lpd. Based on a 16 hour operating day, the continuous flow is estimated at 18.75 Lpm (5.1 USgpm). This is a relatively low water supply requirement. Wells located to the east appear to be completed in a different geologic environment and will not be impacted by a new well on the subject Site. Based on this preliminary assessment, completing a production well similar to one on-Site will not impact the surrounding wells completed with the same production zone. Given the low flow requirement for the water supply, it is also very unlikely that the shallow wells will be impacted given their distance from the Site. The following recommendations are provided to mitigate any impacts on the surrounding wells.

1. Drill a new well on the subject Site and complete the well in accordance with the Groundwater Protection Regulation;

2. Complete a 24 hour pumping test on the new well while monitoring the water levels in the existing well and any neighbouring shallow wells, provided the well owners provide permission. If the shallow well owners do not provide permission to monitor these wells, a shallow monitoring well will be completed to monitor the effect on the watertable;

3. The well flow capacity will be rated based on provincial guidance and will not exceed the rate of recharge to the well to ensure a sustainable flow;

4. Following completion of testing, the existing well should be decommissioned in accordance with the Groundwater Protection Regulation.

ENCLOSURES

Test Pit 1

0-62” Silty SAND & GRAVEL, frequent cobbles, sub rounded, brown, abundant roots medium dense

No seepage, no mottling

Test Pit 2

0-24” Silty SAND and GRAVEL, brown, loose, abundant roots

24”-60” SAND & GRAVEL, some silt, frequent cobbles, occasional boulders, brownish grey, moist, medium dense


Test Pit 3

0-20” Silty SAND, some gravel, brown, medium dense

20”-60” SAND & GRAVEL, some silt, brownish grey, moist, medium dense. At 30” grey and dense silt (discontinuous), some mottling


Roots to 30”

Test Pit 4

0-40” SAND, fine to medium grained, some silt, light brown, loose

40-66” Silty Sand and gravel, frequent cobbles, occasional boulders


Test Pit 5

0-16” Topsoil, organics, cobbles, dark brown

16-26” Silty Sand and gravel, medium dense, brown

26-66” Sand and Gravel, some silt, frequent cobbles, medium dense, brownish grey


Test Pit 6

0-10” organics, dark brown, roots

10-34” Silty Sand, brown, some gravel, frequent cobbles, medium dense

34”-42” Gravel, some sand, trace silt, frequent cobbles, occasional boulders, sub rounded, dense, refusal @ 42” due to a large boulder

No seepage

No Mottling

Test Pit 7

0-12” Silty Sand, brown, loose, (topsoil)

12-36” Sand and Gravel, some silt, frequent cobbles, sub rounded, brown, loose to medium dense, abundant roots

36”-70” Gravel, some Sand, rounded, trace silt, medium dense

No seepage

Roots to 60”

Test Pit 8

0-24” Silty Sand, some gravel, frequent cobbles, brown

24-60” Sand and Gravel, frequent cobbles, some silt, occasional boulders, sub rounded, greyish brown, medium dense, to dense

No seepage

No Mottling

Test Pit 9

0-24” Silty Sand, some gravel, organics, dark brown

24-60” Silty Sand and Gravel, greyish brown, frequent cobbles, occasional boulders, sub rounded, medium dense, abundant roots

No seepage

No Mottling

Test Pit 10

0-24” Silty Sand, some gravel, organics, dark brown

24-60” Sand and Gravel, some silt, greyish brown, frequent cobbles, occasional boulders, sub rounded, medium dense, abundant roots

No seepage

No Mottling

Datum:

Projection:

km0.300.150

NAD_1983_BC_Environment_Albers

NAD83

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29550 LougheedHighway 250m radius

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1: 7,500

Water Wells

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SITE

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WTN 78596

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WTN 10193

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WTN 9925

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WTN 15452

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WTN 1911

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WTN 10143

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WTN 101135

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WTN 53492

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WTN 9333

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Report 1 - Detailed Well Record

Well Tag Number: 1911

Owner: H J MCLANE

Address: DONATELLI RD.

Area:

WELL LOCATION:

Land District

District Lot: Plan: Lot:

Township: 14 Section: 35 Range:

Indian Reserve: Meridian: Block:

Quarter:

Island:

BCGS Number (NAD 83): Well: 8

Class of Well:

Subclass of Well:

Orientation of Well:

Status of Well: New

Well Use:

Observation Well Number:

Observation Well Status:

Construction Method:

Diameter: 0.0 inches

Casing drive shoe:

Well Depth: 17 feet

Elevation: 0 feet (ASL)

Final Casing Stick Up: inches

Well Cap Type:

Bedrock Depth: feet

Lithology Info Flag:

File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:

Construction Date: 1939-01-01 00:00:00

Driller:

Well Identification Plate Number:

Plate Attached By:

Where Plate Attached:

PRODUCTION DATA AT TIME OF DRILLING:

Well Yield: 0 (Driller's Estimate)

Development Method:

Pump Test Info Flag:

Artesian Flow:

Artesian Pressure (ft):

Static Level: 14 feet

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:

Water Chemistry Info Flag:

Field Chemistry Info Flag:

Site Info (SEAM):

Water Utility:

Water Supply System Name:

Water Supply System Well Name:

SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):

WELL CLOSURE INFORMATION:

Reason For Closure:

Method of Closure:

Closure Sealant Material:

Closure Backfill Material:

Details of Closure:

Screen from to feet Type Slot Size Casing from to feet Diameter Material Drive Shoe

GENERAL REMARKS:

LITHOLOGY INFORMATION:

From 0 to 0 Ft. Sand at bottom

From 0 to 0 Ft. Another well (has caved in)

From 0 to 3 Ft. Top soil

From 3 to 5 Ft. Sand with odd lboulder

From 5 to 9 Ft. Gravel and sand

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Information DisclaimerThe Province disclaims all responsibility for the accuracy of information provided.Information provided should not be used as a basis for making financial or anyother commitments.



Owner:

Address: MCLEAN RD.

Area:

WELL LOCATION:

Land District




Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 15 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 0 Ft. Clay and hardpan

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Owner: EMIL ANDERSON

Address: HAYWARD RD.

Area:

WELL LOCATION:

Land District




Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 5 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 0 Ft. No information

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Owner: E SOUTHWORTH


Area:

WELL LOCATION:

Land District




Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 0 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 0 Ft. No information

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Owner: J B BONDETHELU

Address:

Area:

WELL LOCATION:

Land District




Quarter: SE

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 8 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 0 Ft. Glacial gravel

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Owner: M DONATELLI


Area:

WELL LOCATION:

Land District




Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 25 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:



WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 2 Ft. Top soil

From 2 to 25 Ft. Sand with odd rock

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Owner: C CAMPBELL

Address: 29550 LOUGHEED HIGHWAY

Area: MISSION

WELL LOCATION:

Land District

District Lot: 435 Plan: 12792 Lot: D



Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:





Casing drive shoe:

Well Depth: 81 feet



Well Cap Type:

Bedrock Depth: feet


File Info Flag:

Sieve Info Flag:

Screen Info Flag:

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:


Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag:

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:


GENERAL REMARKS:


From 0 to 22 Ft. Fill

From 22 to 24 Ft. Gravel

From 24 to 70 Ft. Cemented gravel

From 70 to 81 Ft. Hard packed gravel

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Owner: WAYNE VOLLET

Address: HAYWARD ROAD

Area: MISSION

WELL LOCATION:

Land District

District Lot: 435 Plan: LMP 24814 Lot:

Township: Section: Range:


Quarter:

Island:


Class of Well:

Subclass of Well:


Status of Well: New

Well Use:




Diameter: 6 inches

Casing drive shoe:

Well Depth: 229 feet



Well Cap Type:

Bedrock Depth: feet

Lithology Info Flag: N

File Info Flag: N

Sieve Info Flag: N

Screen Info Flag: Y

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:



Well Yield: 6.5 (Driller's Estimate)

Development Method:

Pump Test Info Flag: N

Artesian Flow:



WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:



Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag: N

Material:

Method:

Depth (ft):

Thickness (in):


Reason For Closure:

Method of Closure:



Details of Closure:

Screen from to feet Type Slot Size 221 229 12 0 0 0 0 0 0 Casing from to feet Diameter Material Drive Shoenull null 0 null null

GENERAL REMARKS:


From 0 to 57 Ft. GRAVEL & SAND

From 57 to 65 Ft. CLAY GREY

From 65 to 187 Ft. HARD TILL

From 187 to 221 Ft. FAT TILL

From 221 to 229 Ft. FINE HEAVING SAND

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Owner: PAT

Address: 29543 DOMITALLI ROAD

Area: SILVERDALE

WELL LOCATION:

Land District

District Lot: 435 Plan: 12792 Lot: E

Township: Section: Range:


Quarter:

Island:


Class of Well: Water supply

Subclass of Well: Domestic

Orientation of Well: Vertical

Status of Well: New

Well Use:




Diameter: inches

Casing drive shoe: Y

Well Depth: 77 feet

Elevation: feet (ASL)


Well Cap Type:

Bedrock Depth: feet

Lithology Info Flag: N

File Info Flag: N

Sieve Info Flag: N

Screen Info Flag: N

Site Info Details:

Other Info Flag:

Other Info Details:


Driller:


Plate Attached By:




Development Method:

Pump Test Info Flag: N

Artesian Flow:


Static Level:

WATER QUALITY:

Character:

Colour:

Odour:

Well Disinfected: N

EMS ID:

Water Chemistry Info Flag: N


Site Info (SEAM):

Water Utility:



SURFACE SEAL:

Flag: N

Material:

Method:

Depth (ft):

Thickness (in):

Liner from To: feet


Reason For Closure:

Method of Closure:



Details of Closure:

Screen from to feet Type Slot Size Casing from to feet Diameter Material Drive Shoe0 null 6 null Y

GENERAL REMARKS: 1X6 DRIVE SHOE 3 HR DEV NO SCREEN CASING IN THE BOULDERS APP 10 GPM STATIC H2O


From 0 to 19 Ft. OVERBURDEN & BOULDERS

From 19 to 40 Ft. TILL CLAY

From 40 to 55 Ft.

From 55 to 60 Ft.

From 60 to 77 Ft.

From 77 to 84 Ft. DRILLED TO 84' RAN OUT OF H2O

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· based on the water well log (wtn 53492), the on-site well is 81 feet deep and the depth to...

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