Attach_8_-_West_Dease_1992_Environmental_Status_Report.pdf
PDF 1 MB Posted
- Solicitation number
- 140L0623R0021
About this file
This document contains an environmental status report on the West Dease test well site in Alaska. The report provides details on the well site characteristics, including its location approximately 28 miles east-southeast of Barrow. It describes the drilling and reserve pit characteristics, including prior mitigation efforts and sampling history. The report summarizes reconnaissance visits to the site noting vegetation, natural drainage patterns, waste materials present, and contaminant levels detected in reserve pit sediment. Specific conductance and pH levels are reported for water at the site from 1984 through 1990. Locations of soil and water samples with constituent concentrations above criteria levels are shown on maps.
The related federal contract opportunity is for the Tulageak test well #1 and reserve remediation under solicitation number 140L0623R0021 issued by the Bureau of Land Management, National Office within the Department of the Interior. The solicitation seeks remediation services for the well site but provides no further details on response dates, pricing or other contractual requirements.
View the file
Other files
Show all 23
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
26. WELLSITE RISK DETERMINATION
WEST DEASE
OBSERVATION COMMENTS
Wellsite Characteristics
Sampling History 1984(NUERA) I 1989(USGS)
Prior Mitigation Seeded and/or Fertilized 1980,1981,1982
Leakage/Seepage Natural surface drainage patterns into and out of pit
Erosion None
Subsidence Pit subsided through melting underlying ice
Natural Processes Surface expression of natural polygons returning
General Site
Characteristics
Vegetation Poor- brine in fill material
Natural Processes Natural drainage patterns being reestablished
Waste
Drilling Currently covered by up to 7 feet of water in reserve pit
Other Solids None observed
Hydrocarbon Residue TPH, BTEX elevated above background in reserve pit
Contaminant Level TPH, BTEX elevated above background in reserve pit
Contaminant Contaminants localized in reserve pit.
Migration
Contaminant Associated with sediments. Site more than 12 years
Persistence old-Contaminants detected.
Risk Screening
Risk to Fish & Negligible
Wildlife
Risk to Human Negligible
Population
RISK Negligible
DETERMINATION
WORKING DOCUMENT- DECEMBER, 1992
west Dease
Location and Drilling Characteristics
Latitude: 71°09'32.65" Longitude: 155°37'45 . 19"
Location: T . 21 N. , R. 14 W., Sec. 21 NE 1/4, Umiat Meridian
Depth: 4,170 ft Drilled: 2/19/80 - 3/26/80
Description
West Dease Test Well No. 1 (plate 27A) is about 28 mi east-southeast of Barrow in a wet sedge meadow dominated by low-centered polygons. The ground at the wellsite is about 5 ft above sea level. The wellsite was seeded and fertilized in 1960 and 1982 and fertilized only in 1981. The drilling mud used had a high calcium chloride content (greater than 100,000 mg/L Cl and greater than 60,000 mg/L Ca) . Also, the pad material might have high salinity. Water-quality samples were collected by the Nuera Reclamation Company in 1984. The wellsite was visited in both 1989 and 1990.
PREVIOUS WATER-QUALITY DATA FOR RESERVE PIT
Date Temperature pH Specific conductance Reference
7/6/84 3 . 0-5.0 °C 7 . 9-8.0 1,710-1,780 J!S/cm Nuera Reclamation Company (1986, p. 79-80)
Drilling . Pad: Materials for the berms and thin pad were excavated from the reserve pit. During spring thaw, the pad subsided to an irregular shape.
Reserve and Flare Pits: The pits were left open. The depth of water in the reserve pit was 5 ft in July 1984 . Breaches in the reserve pit berm allow water to enter on the south and exit on the east and west . The berm around the flare pit is largely intact.
Summary of Reconnaissance Visits
West Dease is a wet coastal wellsite, with much standing water.
Reindeer Lake outlet, a stream that flows west to east several hundred feet north of the wellsite, discharged 10-50 ft'/s during two summer visits.
Flow near the reserve pit and the pad is toward the north to Reindeer Lake outlet. Revegetation has been moderately successful at this wellsite.
No soil-gas survey was done. The electromagnetic survey showed somewhat elevated earth conductivities downgradient toward the northeast (plate 278) .
The specific conductance of water in the pit (4,310 J!S/cm) and in downgradient ponds was significantly higher than in upgradient Ponds D and H, 247 and 214 J!S/cm, respectively.
The pH of water samples tended to be neutral to alkaline, ranging from 6 . 6 to 9.6 in 1969. Ground-water samples were more acidic; pH's of 5 . 4, 5 . 6, 5.8, and 7 . 2 were recorded at SL 5, SL 6, SL 6 and SL 7, respectively.
In the sediment sample from the reserve pit (SL 3), the concentration of TPH was 620 mg/kg and BTEX was 4.7 mg/kg. All the BTEX was xylene.
Significant concentrations of barium (5,870 mg/kg) and chromium (186 mg/kg) were also detected in reserve pit sediment.
The wellsite was visited twice in 1990 to determine possible changes in the flow regime. On May 23, the ground was 40 percent bare, and a water moat had formed around the bottom-fast ice in the reserve pit. The specific conductance of water in the moat at the main breach was 1,340 ~S/cm and the pH was 7.9 (plate 27C). This is significantly more dilute and less alkaline than during the summer visit in 1989. Flow around the area of the pit was not evident, but there were many puddles of standing water. Reindeer Lake outlet, however, was flowing abundantly.
In July 1990, the specific conductance of water in the reserve pit had risen to 2,580 ~S/cm and was /90 ~S/cm in the flare pit. Thirteen low spot~ on the berm were surveyed and compared with the water surface in the pits.
Only four of the breaches were below the water level on this date. Because the summer of 1990 was drier than 1989, many of the ponds on the pad in 1989 had disappeared and salt patches were more evident.
1t
1!
!I
1!
~ Stressed vegetation
(i~SLB '-::i'
SL7
L~ e
I'--\
~ Pad \.. - '---....... tnaten ) ........___ 'If/
~ SL6.
f wellhead o e SL3
TPM
Reserve Pit
/)euse Inlet /.5 m ilt'S to t·u .st f.'lsun l .ugoun 1.5 m1/1'J to nurth
[Rare Pit]
SL4 e Berms have subsided along ice wedges irregular shaped- pit
0 1 00 200 FEET ~~
West Dease, 1989
Locations of soil samples and constituents haVing concentrations above criteria levels.
1t
1!
!i
1!
"- Stressed vegetation
(i~sLa
SL7
L~ -l '-\ ~ Pad \.. - ) '--...... rtJatena --._1
~ SL6.
wellhead
SL1 e Reserve Pit
/)cust• lnlc:t / .5 mile ,\· to eust
J•: lson l.tJ!(tmn 1.5 mt/t's lo nurt/1
[ RaroPft ]
SL4
e Berms have subsided along ice wedges irregular shaped. pit
0 1 00 200 FEET ~'t-
West Dease, 1989 Locations of water samples and constituents having concentrations above criteria levels
Water in breach channel near .SL5in May ·
... Jt. I " Soec. Cond. 1340
I' l • . /
Water on top of ice, Spec. Cond . 450
0 Augu~Spec.Cond.2580
........., Reserve Pit v ' ~ Stream nearly ice free in M ay '+/
[Flare Pij ]
0 1 00 200 FEET
West Dease, May 23 & August 3, 1990
71°07
I
T.20N.
\) l En
·~f~\
.;r'o - \
I -
<1-_ -c!i - !l 6' •
~30 ...
II
Base from U.S. Geological Survey, Barrow A-2, Barrow A-3, 1:63,360, 1955
0 2 3 4 MILES
E==0=:=:=:=:3======2=====3=3===:=:=:4=:~==~5=K=I=LO~M~ET~ERS
CONTOUR INTERVAL 50 FEET
DATUM IS SEA LEVEL
Location of West Dease well and Tulageak well.
File details come from the government source that posted it. Updated .