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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
60-004(b) 8.8 12/9/1999   YES NO NO NO Site next to access road, north of drilling mud pit, where drums were previously stored.  East end of Sigma Mesa. Mixed grasses, weeds and gravel. Mostly flat area. NO NO None observed.       None observed. NO No structural impacts. NO No operational impacts. NO No upslope drainage. Veenis, Steve     NO  
60-004(d) 8.8 12/9/1999   YES NO NO NO 60 square foot area used for D&D of USTs and temporary drum storage on east end of Sigma Mesa. Mixed grasses, weeds and gravel. Mostly flat with gentle slope to the south. NO NO None observed.       None observed. NO No structural impacts. NO No operational impacts. NO No upslope drainage. Veenis, Steve     NO  
60-004(e) 32.5 12/9/1999   YES NO NO NO A 100 square foot area on the east end of Sigma Mesa. Vegetation mixed grasses, weeds, and gravel. Mostly flat with gentle slope towards the south-southeast. YES NO Evidence of sheetflow runoff to the south edge of the mesa.     Sheetflow runoff over edge of mesa onto bench setting within Mortandad Canyon. Evidence of sheetflow erosion near mesa edge. NO No structural impacts. NO No operational impacts. YES Gentle upslope drainage onto site. Veenis, Steve     NO Site is stable, no BMPs are recommended.
60-007(a) 15.3 12/9/1999   YES NO NO NO 20 foot square area of stained soil near geothermal well.  Former equipment storage area located on east end of Sigma Mesa. Mixed grasses, weeds and gravel. Mostly flat area. NO NO None observed.       None observed. NO No structural impacts. NO No operational impacts. NO No upslope drainage. Veenis, Steve     NO