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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

72-001

84.3

7/29/1998

72-39

NO

NO

NO

YES

Arroyo of canyon passes through firing range.

Arroyo sandy, no cover.  Surrounding areas thick grass cover.

Canyon floor flat, streambed tends to meander across area, so berms with "Jersey barrier" cores have been constructed to divert runoff away from canopies.

YES

YES

Natural arroyo.  Width varies from 10-30 feet.  However, the channel height has increased over time due to stream channel containments so the channel tends to break out carrying sand into grassy areas.

Flows heavy significant sand movement in storm events.

Not really a gully but major sediment transport.

NO

NO

YES

Flow in arroyo greatly influenced by parking lots in TA-53.  According to Steve Rivera Firing Site Operator, it only flows during intense storms.

D. Mays

Earth berms with "Jersey barrier" core to divert stream channel from structures and firing range.  No maintenance required due to mass of Jersey barriers, installed 1998.

NO

Unusual site - flat with a lot of soil movement.  Dikes built to protect structures rather than control sediment transport.