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Difference between revisions of "0515183315002"

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{| class="wikitable welldetails" width="95%"
 
{| class="wikitable welldetails" width="95%"
 
| Well ID: 0515183315002
 
| Well ID: 0515183315002
| style="height=100%; align=center" rowspan="14" | {{#display_map: 53.44021300000002839, -116.57859700000000203 | width=100% | height=100% }}
+
| style="height=100%; align=center" rowspan="21" | {{#display_map: 53.440213, -116.578597 | width=100% | height=100% }}
 
|-
 
|-
 
| Location: 00/15-33-051-18W5/2
 
| Location: 00/15-33-051-18W5/2
 
|-
 
|-
| Well Name: PEOC HZ EDSON 15-33-51-18
+
| Location Alias: 00/15-33-51-18 W5M
 +
|-
 +
| Location Alias 2: 00/15-33-051-18 W5/02
 +
|-
 +
| Country: Canada
 +
|-
 +
| Province: Alberta
 +
|-
 +
| Township: 051
 +
|-
 +
| Meridian: 5
 +
|-
 +
| Range: 18
 +
|-
 +
| Section: 33
 +
|-
 +
| County/Municipality: [[Yellowhead County,_Alberta|Yellowhead County]]
 +
|-
 +
| Well Name: TOURMALINE HZ EDSON 4-34-51-18
 +
|-
 +
| Operator Name: [[Tourmaline Oil Corp.]]
 +
|-
 +
| License Number: 0466527
 
|-
 
|-
 
| License Date: 2014-05-07
 
| License Date: 2014-05-07
 
|-
 
|-
| Final Drilling Date: 2014-07-28
+
| License Status: Amended
 
|-
 
|-
| Total Depth: 4106.0m
+
| Spud Date: 2014-07-08
 
|-
 
|-
| Fluid Type: Not Applicable
+
| Final Drill Date: 2014-07-28
 
|-
 
|-
| Status: Drilling and Cased
+
| Well Total Depth: 4106.00 m
 
|-
 
|-
| Well Type: Not Applicable
+
| Surface Hole Latitude: 53.440213
 
|-
 
|-
| Configuration: Horizontal
+
| Surface Hole Longitude: -116.578597
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Licensing Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-22
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-07 }}</ref><ref>{{cite web
 +
| title = General Well Data File - Drilling Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-22
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-07 }}</ref>
 +
== Well History ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Date
 +
!scope="col" | Event
 
|-
 
|-
| Latitude: 53.44021300000002839
+
| 2014-05-07
 +
| Obtained License
 
|-
 
|-
| Longitude: -116.57859700000000203
+
| 2014-07-11
 +
| Surface Casing Operation Performed
 
|-
 
|-
 +
| 2014-07-19
 +
| Direction Drilling Operation Performed - Deviate
 +
|-
 +
| 2014-07-20
 +
| Well Log Performed
 +
|-
 +
| 2014-07-21
 +
| Intermediate Casing Operation Performed
 +
|-
 +
| 2014-07-23
 +
| Direction Drilling Operation Performed - Horizontal
 +
|-
 +
| 2014-07-28
 +
| Finished Drilling
 +
|-
 +
| 2014-07-28
 +
| Well Log Performed
 +
|-
 +
| 2014-07-28
 +
| Well Mode changed to Drilled and Cased
 +
|-
 +
| 2014-07-30
 +
| Liner Casing Operation Performed
 +
|-
 +
| 2014-07-30
 +
| Perforation Treatment Performed - Open-Hole Completion
 +
|-
 +
| 2014-07-31
 +
| Rig Released
 +
|-
 +
| 2014-09-05
 +
| Perforation Treatment Performed - Multi-Stage Fracture
 +
|-
 +
| 2014-09-15
 +
| Well Began Production
 +
|-
 +
| 2014-09-15
 +
| Well Fluid changed to Gas
 +
|-
 +
| 2014-09-15
 +
| Well Mode changed to Flowing
 +
|-
 +
| 2018-01-17
 +
| Well Fluid changed to Gas
 +
|-
 +
| 2018-01-17
 +
| Well Mode changed to Pumping
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-22
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-04-29 }}</ref>
 +
<!--== Spud Table ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Spud Date
 +
!scope="col" | Contractor
 +
!scope="col" style="text-align: right;" | Rig Number
 +
!scope="col" style="text-align: right;" | New Projected Depth (m)
 +
!scope="col" | Activity Type
 +
|-
 +
|}-->
  
 +
== Directional Drilling ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Start Date
 +
!scope="col" style="text-align: right;" | Depth (m)
 +
!scope="col" | Reason
 +
|-
 +
| 2014-07-19
 +
| style="text-align: right;" | 2439.90
 +
| Deviate (5 - 79 degrees)
 +
|-
 +
| 2014-07-23
 +
| style="text-align: right;" | 2879.10
 +
| Horizontal
 +
|-
 
|}
 
|}
 
For data sources see<ref>{{cite web
 
For data sources see<ref>{{cite web
  | title = ST37: List of Wells in Alberta
+
  | title = General Well Data File - Tour-Direction Drilling Data
 
|publisher = [[Alberta Energy Regulator]]
 
|publisher = [[Alberta Energy Regulator]]
| date = 2015-07-02
+
| date = 2020-04-22
 
  | url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 
  | url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
  | accessdate = 2015-07-14 }}</ref>
+
  | accessdate = 2020-05-07 }}</ref>
 +
== Perforation Treatments ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Perforation Date
 +
!scope="col" | Perforation Type
 +
!scope="col" style="text-align: right;" | Interval Top (m)
 +
!scope="col" style="text-align: right;" | Interval Base (m)
 +
!scope="col" style="text-align: right;" | Number of Shots
 +
|-
 +
| 2014-07-30
 +
| Open Hole/Barefoot Completion
 +
| style="text-align: right;" | 4083.50
 +
| style="text-align: right;" | 4106.00
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3254.90
 +
| style="text-align: right;" | 3255.00
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3162.20
 +
| style="text-align: right;" | 3162.30
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3069.50
 +
| style="text-align: right;" | 3069.60
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2976.70
 +
| style="text-align: right;" | 2976.80
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2895.30
 +
| style="text-align: right;" | 2895.40
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 4061.60
 +
| style="text-align: right;" | 4061.70
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3974.80
 +
| style="text-align: right;" | 3974.90
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3882.40
 +
| style="text-align: right;" | 3882.50
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3789.50
 +
| style="text-align: right;" | 3789.60
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3614.60
 +
| style="text-align: right;" | 3614.70
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3521.30
 +
| style="text-align: right;" | 3521.40
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3429.00
 +
| style="text-align: right;" | 3429.10
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2014-09-05
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3347.10
 +
| style="text-align: right;" | 3347.20
 +
| style="text-align: right;" | 0
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Tour-Perforation/Treatment Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-22
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-07 }}</ref>
 +
== Fracking Activities ==
 +
==== Fracking Jobs ====
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Job Number
 +
!scope="col" | Job Start Date
 +
!scope="col" | Job End Date
 +
!scope="col" | True Vertical Depth (ft)
 +
!scope="col" | Total Water Volume (gal)
 +
!scope="col" | Total Non-Water Volume (gal)
 +
|-
 +
| 1
 +
| 2014-09-05
 +
| 2014-09-05
 +
| style="text-align: right;" | 2,734
 +
| style="text-align: right;" | 4,475
 +
| style="text-align: right;" | N/A
 +
|-
 +
|}
 +
==== Fluid Composition Data ====
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Job Number
 +
!scope="col" | Trade Name
 +
!scope="col" | Supplier
 +
!scope="col" | Purpose
 +
!scope="col" | Ingredient Name
 +
!scope="col" | CAS Number
 +
!scope="col" | Additive Percentage by Mass
 +
!scope="col" | Job Percentage by Mass
 +
!scope="col" | Mass Used (lb)
 +
|-
 +
|- valign="top"
 +
| rowspan="10"| 1
 +
| rowspan="1"|
 +
| rowspan="1"|
 +
| rowspan="1"|
 +
| Water
 +
| Not Available
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 83.0912
 +
| style="text-align: right;" | N/A
 +
|-
 +
|- valign="top"
 +
| rowspan="1"| 30/50
 +
| rowspan="1"| Sanjel
 +
| rowspan="1"|
 +
| Crystalline Silica
 +
| 14808-60-7
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 8.0263
 +
| style="text-align: right;" | N/A
 +
|-
 +
|- valign="top"
 +
| rowspan="1"| 50/140
 +
| rowspan="1"| Sanjel
 +
| rowspan="1"|
 +
| Crystalline Silica
 +
| 14808-60-7
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 1.2209
 +
| style="text-align: right;" | N/A
 +
|-
 +
|- valign="top"
 +
| rowspan="2"| B-1008
 +
| rowspan="2"| Sanjel
 +
| rowspan="2"| Bactericide/Biocide
 +
| BNPD
 +
| 52-51-7
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.0088
 +
| style="text-align: right;" | N/A
 +
|-
 +
| Methyl Alcohol
 +
| 67-56-1
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.0088
 +
| style="text-align: right;" | N/A
 +
|-
 +
|- valign="top"
 +
| rowspan="2"| SCC-6L
 +
| rowspan="2"| Sanjel
 +
| rowspan="2"| Clay Control
 +
| 1.6-Hexanediamine dihydrochloride
 +
| 6055-52-3
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.1625
 +
| style="text-align: right;" | N/A
 +
|-
 +
| Non-Hazardous Ingredients
 +
| Not Available
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.1625
 +
| style="text-align: right;" | N/A
 +
|-
 +
|- valign="top"
 +
| rowspan="3"| FRW-3
 +
| rowspan="3"| Sanjel
 +
| rowspan="3"| Friction Reducer
 +
| Isoparaffinic Solvent
 +
| 64742-47-8
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.0811
 +
| style="text-align: right;" | N/A
 +
|-
 +
| Non-Hazardous Ingredients
 +
| Not Available
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.0811
 +
| style="text-align: right;" | N/A
 +
|-
 +
| Surfactant
 +
| 68131-40-8
 +
| style="text-align: right;" | 100
 +
| style="text-align: right;" | 0.0811
 +
| style="text-align: right;" | N/A
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = Hydraulic Fracturing Water Use Data (Annual)
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-05-05
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-10 }}</ref>
 +
== Water Sources ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Water Diversion Start Date
 +
!scope="col" | Water Diversion End Date
 +
!scope="col" | Water Source Type
 +
!scope="col" style="text-align: right;" | Total Water Volume (m<sup>3</sup>)
 +
|-
 +
| 2014-09-01
 +
| 2014-09-03
 +
| Surface Water - River
 +
| style="text-align: right;" | 4361
 +
|-
 +
| 2014-08-30
 +
| 2014-08-30
 +
| Recycled Fracturing Water (treated at well site)
 +
| style="text-align: right;" | 425
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = Hydraulic Fracturing Water Source Data (Annual)
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-12-31
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2019-05-10}}</ref>
 +
== Production Data ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Period
 +
!scope="col" style="text-align: right;" | Total Production Hours
 +
!scope="col" style="text-align: right;" | Gas Quantity (m<sup>3</sup>)
 +
!scope="col" style="text-align: right;" | Oil Quantity (m<sup>3</sup>)
 +
!scope="col" style="text-align: right;" | Water Quantity (m<sup>3</sup>)
 +
|-
 +
| 2014
 +
| style="text-align: right;" | 2520
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2015
 +
| style="text-align: right;" | 7669
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2016
 +
| style="text-align: right;" | 8650
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2017
 +
| style="text-align: right;" | 7537
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2018
 +
| style="text-align: right;" | 8114
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2019
 +
| style="text-align: right;" | 8711
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
| 2020
 +
| style="text-align: right;" | 2183
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 0.0
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = Well Production Data - All Alberta
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-25
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-07 }}</ref>
 +
== Occurences ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Occurence Date
 +
!scope="col" | Occurence Type
 +
!scope="col" style="text-align: right;" | Occurence Depth (m)
 +
!scope="col" style="text-align: right;" | Occurence Control Depth (m)
 +
|-
 +
| 2014-07-31
 +
| No Incident Encountered
 +
| style="text-align: right;" | 0.00
 +
| style="text-align: right;" | 0.00
 +
|-
 +
| 2014-09-05
 +
| No Incident Encountered
 +
| style="text-align: right;" | 0.00
 +
| style="text-align: right;" | 0.00
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Tour-Occurence Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2020-04-22
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2020-05-07 }}</ref>
 
==References==
 
==References==
 
+
<references/>
 
__NOEDITSECTION__
 
__NOEDITSECTION__
[[Category:Wells]]
+
[[Category:Alberta Wells]]
 +
[[Category:FracFocus]]

Latest revision as of 00:22, 20 January 2021

Well Details

Well ID: 0515183315002
Loading map...
Location: 00/15-33-051-18W5/2
Location Alias: 00/15-33-51-18 W5M
Location Alias 2: 00/15-33-051-18 W5/02
Country: Canada
Province: Alberta
Township: 051
Meridian: 5
Range: 18
Section: 33
County/Municipality: Yellowhead County
Well Name: TOURMALINE HZ EDSON 4-34-51-18
Operator Name: Tourmaline Oil Corp.
License Number: 0466527
License Date: 2014-05-07
License Status: Amended
Spud Date: 2014-07-08
Final Drill Date: 2014-07-28
Well Total Depth: 4106.00 m
Surface Hole Latitude: 53.440213
Surface Hole Longitude: -116.578597

For data sources see[1][2]

Well History

Date Event
2014-05-07 Obtained License
2014-07-11 Surface Casing Operation Performed
2014-07-19 Direction Drilling Operation Performed - Deviate
2014-07-20 Well Log Performed
2014-07-21 Intermediate Casing Operation Performed
2014-07-23 Direction Drilling Operation Performed - Horizontal
2014-07-28 Finished Drilling
2014-07-28 Well Log Performed
2014-07-28 Well Mode changed to Drilled and Cased
2014-07-30 Liner Casing Operation Performed
2014-07-30 Perforation Treatment Performed - Open-Hole Completion
2014-07-31 Rig Released
2014-09-05 Perforation Treatment Performed - Multi-Stage Fracture
2014-09-15 Well Began Production
2014-09-15 Well Fluid changed to Gas
2014-09-15 Well Mode changed to Flowing
2018-01-17 Well Fluid changed to Gas
2018-01-17 Well Mode changed to Pumping

For data sources see[3]

Directional Drilling

Start Date Depth (m) Reason
2014-07-19 2439.90 Deviate (5 - 79 degrees)
2014-07-23 2879.10 Horizontal

For data sources see[4]

Perforation Treatments

Perforation Date Perforation Type Interval Top (m) Interval Base (m) Number of Shots
2014-07-30 Open Hole/Barefoot Completion 4083.50 4106.00 0
2014-09-05 Multi-Stage Fracture 3254.90 3255.00 0
2014-09-05 Multi-Stage Fracture 3162.20 3162.30 0
2014-09-05 Multi-Stage Fracture 3069.50 3069.60 0
2014-09-05 Multi-Stage Fracture 2976.70 2976.80 0
2014-09-05 Multi-Stage Fracture 2895.30 2895.40 0
2014-09-05 Multi-Stage Fracture 4061.60 4061.70 0
2014-09-05 Multi-Stage Fracture 3974.80 3974.90 0
2014-09-05 Multi-Stage Fracture 3882.40 3882.50 0
2014-09-05 Multi-Stage Fracture 3789.50 3789.60 0
2014-09-05 Multi-Stage Fracture 3614.60 3614.70 0
2014-09-05 Multi-Stage Fracture 3521.30 3521.40 0
2014-09-05 Multi-Stage Fracture 3429.00 3429.10 0
2014-09-05 Multi-Stage Fracture 3347.10 3347.20 0

For data sources see[5]

Fracking Activities

Fracking Jobs

Job Number Job Start Date Job End Date True Vertical Depth (ft) Total Water Volume (gal) Total Non-Water Volume (gal)
1 2014-09-05 2014-09-05 2,734 4,475 N/A

Fluid Composition Data

Job Number Trade Name Supplier Purpose Ingredient Name CAS Number Additive Percentage by Mass Job Percentage by Mass Mass Used (lb)
1 Water Not Available 100 83.0912 N/A
30/50 Sanjel Crystalline Silica 14808-60-7 100 8.0263 N/A
50/140 Sanjel Crystalline Silica 14808-60-7 100 1.2209 N/A
B-1008 Sanjel Bactericide/Biocide BNPD 52-51-7 100 0.0088 N/A
Methyl Alcohol 67-56-1 100 0.0088 N/A
SCC-6L Sanjel Clay Control 1.6-Hexanediamine dihydrochloride 6055-52-3 100 0.1625 N/A
Non-Hazardous Ingredients Not Available 100 0.1625 N/A
FRW-3 Sanjel Friction Reducer Isoparaffinic Solvent 64742-47-8 100 0.0811 N/A
Non-Hazardous Ingredients Not Available 100 0.0811 N/A
Surfactant 68131-40-8 100 0.0811 N/A

For data sources see[6]

Water Sources

Water Diversion Start Date Water Diversion End Date Water Source Type Total Water Volume (m3)
2014-09-01 2014-09-03 Surface Water - River 4361
2014-08-30 2014-08-30 Recycled Fracturing Water (treated at well site) 425

For data sources see[7]

Production Data

Period Total Production Hours Gas Quantity (m3) Oil Quantity (m3) Water Quantity (m3)
2014 2520 0.0 0.0 0.0
2015 7669 0.0 0.0 0.0
2016 8650 0.0 0.0 0.0
2017 7537 0.0 0.0 0.0
2018 8114 0.0 0.0 0.0
2019 8711 0.0 0.0 0.0
2020 2183 0.0 0.0 0.0

For data sources see[8]

Occurences

Occurence Date Occurence Type Occurence Depth (m) Occurence Control Depth (m)
2014-07-31 No Incident Encountered 0.00 0.00
2014-09-05 No Incident Encountered 0.00 0.00

For data sources see[9]

References