1) The document discusses oil sampling locations along Red Butte Creek and the Jordan River following an oil spill. There are 5 control sites, 2 below stream sites, and 2 storm drain sites that discharge into the Jordan River. 2) Water samples measure the amount of oil diffused in the water column, not the total amount, as the diffused portion is potentially toxic to aquatic life. Toxic effects ratios above 1 indicate toxic pollutant concentrations. 3) Data shows declining oil product concentrations and toxic effects ratios since the spill. The highest oil readings were at the 1100 East location in Red Butte Creek, but oil has rarely been detected in the Jordan River and never at high levels.

1. Red Butte
Locations
• 3 control site locations
• 2 sites below in
stream
• Both storm drains
before entering the
Jordan

2. Jordan River Locations

3. General Points About Oil and Water
Chemistry
•Water samples measure the amount of product diffused
in the water column, not the total amount of oil in the
ecosystem.
• The diffused product is the potentially toxic portion of oil
for fish and other aquatic life.
• When measuring potential impacts to aquatic life, it is
critical to measure the cumulative effects of potentially
toxic substances (toxic effects ratios)
• Data are currently available beginning on 6/15 and
ending on 6/24 (other samples are being processed).

4. Total Petroleum Products
40
Total Recoverable Petroleum Hydrocarbons
30
6-15
• Steady declines have been observed in
the quantity of oil related products since
20
the spill.
10
• At Red Butte Creek the highest
concentrations of oil products diffused in
the water column have been at 1100 East.
40
6-24 • Oil has rarely been detected at any of the
30
Jordan River locations since the spill, and
never at high concentrations (maximum
20
TRPH = 3.6).
10
Be 11 St
low 00 or
m
E
Dr
ai
n s

5. 20
6-15
15 Toxic Effects Ratios
• Toxic Effects Ratios greater than one
10
Chronic Effects Ratio
indicate concentrations of cumulative
pollutants that are toxic to aquatic life.
5
• Toxic effects have been declining since
the spill took place.
15
6-24 • Both acute and toxic effects were
observed the 1100 E. location until the
10
most recent sampling event.
• Neither acute or chronic effects have
been observed in the Jordan River.
5
0
Be 11 St
low 00 or
m
E
Dr
ai
ns