Nebraska Department of Environmental Quality
Pay For Performance
Site Summary
Intended for use by NDEQ's pre-qualified Pay for Performance Contractors. Potential bidding Contractors should not contact the State Contractor that performed the Tier 1 & 2 with questions about the site. Those types of questions should be addressed to Phil Hargis at (402) 471-3150 or Email at Phil.Hargis@Nebraska.Gov.
.
Date:06/09/2004
Site Name:Seger Oil
UG#09297-NEW-1400
Address:NE Corner of Hwy. 20 & Hwy. 183
County:Rock
Closest TownBassett
Legal Description:SW, SW, SW, S10 T30N R19W
Contractor Performing Assessment:Terracon
Tier 1 Date:03/01/95
Tier 2 Date:06/12/2003
Property Owner’s Name:Todd & Julie Taylor
Property Owner’s Phone Number:402-684-3322
Contamination Types:Gasoline & Diesel
PFP Bid Number:NE-010
Posting Date:06/30/2004
Closing Date for requesting clarifications from the NDEQ:10/15/2004
Clarifications to relevant questions will be issued by the NDEQ by:10/22/2004
Bid Submittal Deadline 12/03/2004 at 2:00 pm central time.

Site Summary:
Former Seger Oil is located on the NE corner of Highways 20 and 183 on the south end of the Village of Bassett. NDEQ first became aware of a possible petroleum leak when 13 tanks were removed at the site in 1987. A Site Assessment was requested and performed in 1987, and it indicated the soils and ground water had been impacted. The site was added to the orphan tank program and backlogged for future work. The site was re-activated in 1994, and then current State Contractor ESE performed further site assessment work and installed 14 additional monitor wells. In 2001 and 2002 the site was evaluated under the RCBA process, and it failed for Benzene concentrations.

Additional work was performed and submitted to the Department in June of 2003, and again it failed for ground water Benzene concentrations. In January of 2004 employees began to report petroleum vapors in the Tri-County Bank directly to the west of Seger Oil. After air monitoring was requested by NDEQ, we have confirmed that petroleum vapors are in fact entering the bank. The levels are low and are not exceeding health risk levels at this time. NDEQ has confirmed that a service station has been in business at the site in the past, but we also believe that the Seger Oil site is contributing to the vapor problem at the bank, as ground water flow is west in this area. Any clean-up and vapor mitigation at the bank site will be performed by DEQ's State Contractor (Terracon) and is not a part of this PFP remediation request.

This site lies in the northwest portion of the Sand Hills Region near the headwaters of the Elkhorn River. Ground water is encountered typically at five to six feet below ground level, and little drop has been noted in the water table in this area due to the drought.

Table 1. Final Tier 2 Sampling Results:

Well
Benzene
Toluene
Ethylbenzene
Xylenes
MTBE
Naphthalene
TEH-Diesel
Total Conc.
MW-1
6.94
.259
.969
3.65
ND
.526
1.94
14.284
MW-5
3.04
.399
.332
.568
.011
.06
.542
4.952
MW-6
4.07
ND
.563
1.28
ND
ND
ND
5.913
MW-8
.622
.127
.532
.926
ND
.165
1.01
3.382
Plume Total Concentration
14.672
.785
2.396
6.424
.011
.751
3.492
28.531
Plume SSTL Concentration
6.888
>Sol
>Sol
>Sol
24.227
>Sol
8,531.00
8,562.189
Plume Initial Concentration above SSTLs
7.84
Not Over
Not Over
Not Over
Not Over
Not Over
Not Over
Not Over
MW-2*
ND
ND
ND
ND
ND
ND
ND
ND
MW-9*
.912
.127
.532
.926
ND
.165
1.01
3.672
MW-14*
ND
ND
ND
ND
ND
ND
ND
ND
MW-19*
ND
ND
ND
ND
ND
ND
ND
ND
MW-23*
ND
ND
ND
ND
ND
ND
ND
ND
MW-24*
ND
ND
ND
ND
ND
ND
ND
ND
MW-31*
ND
ND
ND
ND
ND
ND
ND
ND

All concentrations are in mg/l. Numbers in red exceed the SSTLs. * These monitor wells are at, or below detection limits or calculated SSTLs. Sampling date 5/13/2004

Table 2. SSTLs:

Well
Benzene
Toluene
Ethylbenzene
Xylenes
MTBE
Naphthalene
TEH-Diesel
MW-1
3.444
>Sol
>Sol
>Sol
10.533
>Sol
3655
MW-5
2.028
>Sol
>Sol
>Sol
6.300
>Sol
2231
MW-6
.868
>Sol
>Sol
>Sol
2.727
>Sol
980
MW-8
.548
>Sol
>Sol
>Sol
4.667
>Sol
1665

All concentrations are in mg/l.
Pictures:
MW28 Southeast.JPG

Sinclair Northeast.JPG
MAPS:
Area

SEGEROIL_EXPL Model (1).pdf
Benzene Contour
BENZENE CONCENTRATION MAP.pdf

Site Specifications:
1. As this site is an operating business, it is not a candidate for overexcavation.

2. If you are going to do a site visit, please stop in the station and let whomever is working know you are there. That is all that is required by the owners.

3. The entire front and sides of the station will require new concrete at the end of the cleanup. This will include a couple of small areas that currently don't have concrete.

4. The owners are comfortable with what is about to happen at this site. NDEQ will do an introductory meeting with the selected contractor, the Village and the current owners of the cleanup site.

5. The situation at the bank across the street is not a part of this cleanup. Only the portion of the plume east of the centerline of the Highway 7 is the PFP contractor's responsibility.

6. There is a clay layer starting at approximately 15 feet BGL. No wells have penetrated through the clay layer in the entire town except for the municipal wells to the north and south. It will be a requirement at this site by contract, that the clay layer not be penetrated at any time during this clean-up. The clay layer seems to be very consistent throughout this area.

7. There are no private wells in the area, and the closest municipal well is over 1,000 feet away.

.
Department Contacts: Phil Hargis and David Chambers at (402) 471-3150

For a complete copy of the file, please follow the copying instructions on NDEQ’s PFP web site.



Nebraska Department of Environmental Quality
1200 "N" Street, Suite 400
P.O. Box 98922
Lincoln, Nebraska 68509
(402) 471-2186