Chevron Red River

Chevron Red RiverChevron Red River

Lisa Schall

Jennifer Smith

Underground Storage Tank Bureau

Chevron Red River: BackgroundChevron Red River: Background

March 1990: Petroleum contamination discovered

August 1991: Tank closure

October 1991: Gasoline constituents identified in storm sewer discharge to Red River

May 1992: State lead contract signed

August 1992: Impermeable sleeve installed in storm sewer / Assessment activities completed

Chevron Red River: Extent of Contamination, 7/92Chevron Red River: Extent of Contamination, 7/92

Storm Sewer OutletStorm Sewer Outlet

Chevron Red River: Reclamation SystemChevron Red River: Reclamation System

Hydrocarbon Removed vs Time

0

50

100

150

200

250

300

350

0 1656 4224 8264 12655 16576

Cumulative SVE System Run Time (Hours)

Cu

mu

lati

ve

Gal

lon

s o

f G

aso

lin

e R

emo

ved

MW-3

0

500

1000

1500

2000

2500

Aug-9

3

Oct-93

Dec-9

3

Feb-9

4

Apr-9

4

Jun-

94

Aug-9

4

Oct-94

Dec-9

4

Feb-9

5

Apr-9

5

Jun-

95

Aug-9

5

Oct-95

Dec-9

5

Feb-9

6

Apr-9

6

Jun-

96

Aug-9

6

Oct-96

Dec-9

6

Feb-9

7

Apr-9

7

Jun-

97

Aug-9

7

Date

Ben

zen

e (u

g/l

)

MW-5

0

200

400

600

800

1000

1200

1400

Aug-9

3

Oct-93

Dec-9

3

Feb-9

4

Apr-9

4

Jun-

94

Aug-9

4

Oct-94

Dec-9

4

Feb-9

5

Apr-9

5

Jun-

95

Aug-9

5

Oct-95

Dec-9

5

Feb-9

6

Apr-9

6

Jun-

96

Aug-9

6

Oct-96

Dec-9

6

Feb-9

7

Apr-9

7

Jun-

97

Aug-9

7

Date

Be

nze

ne

(u

g/l)

MW-12

0

200

400

600

800

1000

1200

1400

1600

1800

Aug-9

3

Oct-93

Dec-9

3

Feb-9

4

Apr-9

4

Jun-

94

Aug-9

4

Oct-94

Dec-9

4

Feb-9

5

Apr-9

5

Jun-

95

Aug-9

5

Oct-95

Dec-9

5

Feb-9

6

Apr-9

6

Jun-

96

Aug-9

6

Oct-96

Dec-9

6

Feb-9

7

Apr-9

7

Jun-

97

Aug-9

7

Date

Be

nze

ne

(u

g/l)

Chevron Red River: Expenditures To DateChevron Red River: Expenditures To Date

$29,003.62

$17,213.00

$198,282.34 $132,623.34

Site Assessment

Storm Drain Modification

Installation of ReclamationSystem

Operation & Maintenance ofSystem

Expenditures: Current & FutureExpenditures: Current & Future

To Date: $377,122.30

Projected Cost to Closure: $90,000