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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 57-001(b) 22.3 9/4/1997 57-17 YES NO NO NO Located south of TA-57-17. Little to no vegetation at edge of PRS along the roadway. Away from roadway, in majority of the site, heavy ground cover present. NO NO Mesa top Several gullies and significant rill erosion present on site. Erosion primarily on the hillside between the two sections of the PRS. BMPs in place are retaining sediment. YES Dirt roadways adjacent to the site are creating run-on. NO YES Run-off from the surrounding dirt roads flows onto the site. T. Lemke Silt fence along boundary fence at south end or PRS. NO The potential for additional erosions and further damage exists. 57-002 15.3 9/4/1997 YES NO NO NO Sludge drying beds on mesa top. Designated east and west pits. Little or no vegetation in east pit (0-25%).
Significant ground cover in west pit (75-100%).Both pits are depressions surrounded by berms. NO NO Both pits are depressions surrounded by berms. NO NO NO T. Lemke Both pits are surrounded by earth berms. NO Areas receive little to no run-on, hold water, and are bermed. 57-003 3.6 10/30/1997 57-56 YES NO NO NO Fuel and satellite hazardous waste storage area. Contained within Structure TA-57-56. Site is contained within TA-57-56 which is open to the environment only on the east side. The floor of the structure is concrete with a concrete curb along the east side. NO NO NO PRS is enclosed within a structure. NO NO T. Lemke Concrete curbing is placed along the open (east) side of TA-57-56 to contain spills. NO PRS is contained within a structure. Secondary containment is provided and no soil is present on site. 57-004(a) 15.3 9/4/1997 YES NO NO NO Settling pond for geothermal fluid. No longer active. Contents primarily rainfall accumulation. Settling pond. Area around pond covered with gravel. NO NO NO Geothermal fluid no longer pumped into pond. NO NO T. Lemke NO 57-006 15.8 9/4/1997 57-37 YES NO NO NO East of 57-37 along southern edge of main roadway. Heavy ground cover, primarily grasses. Ground slopes away from roadway. NO NO YES Some evidence of run-off from dirt roadway creating run-on to sites. NO NO T. Lemke NO 57-007 15.8 9/4/1997 57-37 YES NO NO NO East of 57-37 along southern edge of main roadway. Heavy ground cover, primarily grasses. Ground slopes away from roadway. NO NO YES Some evidence of run-off from dirt roadway creating run-on to sites. NO NO T. Lemke NO