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PRS

Erosion Matrix Score

Assessment Date

Structure

Mesa Top

Bench

Canyon Floor

Channel

Topography Explanation

Ground Explanation

Slope Explanation

Runoff Evidence

Channelized

Channel Description

Runoff Wetland

Runoff Other

Terminus Explanation

Runoff Explanation

Structure Run-On

Structure Explanation

NPDES Run-On

NPDES Explanation

Natural Run-On

Natural Run-On Explanation

ESH-18 Representative

BMP Prescription

BMP Description

Not BMPs Sediment

Comments

41-002(b)

33.0

8/6/1997

NO

NO

YES

NO

NO

NO

NO

NO

YES

2-3 feet deep storm water run-off channel out along side of both PRSs / see attached drawing.

R. Reynolds

NO

See attached drawing.

41-002(c)

33.0

8/6/1997

NO

NO

YES

NO

NO

NO

NO

NO

YES

2-3 feet deep storm water run-off channel out along side of both PRSs / see attached drawing.

R. Reynolds

NO

See attached drawing.

41-003

15.6

9/24/1997

41-1

NO

NO

YES

NO

Site of former sump pit to east of tunnel 1 gate, replaced by retaining wall supporting HEPA filter.

NO

NO

NO

NO

NO

R. Reynolds

NO

C-41-004

52.8

8/6/1997

NO

NO

NO

YES

Catch basin for parking lot run-off. Willow tree canopy over outfall.

YES

NO

Down steep creek bank leading to outfall and PRS.

PRS is at edge of stream.

NO

NO

YES

R. Reynolds

Improve BMPs to stabilize steep bank at PRS site leading to outfall, i.e., terraces, water rows, rock rows.

NO