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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 54-001(d) 3.6 8/14/1997 YES NO NO NO TA-54 - Bldg. 39 PCB storage building. Building (inside) in the PRS completed contained. NO NO NO NO NO R. Reynolds NO Building loading/unloading activities covered under TA-54-L SWPP Plan. 54-004 45.6 12/20/2000 54-38 YES NO NO NO Located near TA-54 West off of Pajarito Road. Mesa top setting with dirt/gravel access road on the south and west end. The PRS is surrounded by a security fence. MDA H. Good vegetative cover with mixed grasses. Area generally flat with a gentle slope towards the south. YES NO Runoff evidence exists south of the fenced area. A drainage swale/ditch exists between the fenced area and the access road. Sheet flow runoff flows to drainage swale/ditch which discharges to the mesa edge and into Pajarito Canyon. Rill erosion is occurring at one location along the southern fence line. The erosional feature intersects with the drainage swale/ditch. NO No structural impact. NO No operational impact. YES Minor run-on to PRS from the northwestern portion of the site. Veenis, Steve NO Run-on diversion and sediment retention BMPs could help stabilize the site until permanent measures are implemented. 54-007(c) 56.0 5/5/2000 54-38 YES NO NO NO Septic system (54-89) located west of building 54-34. Mixed grasses, pinon pine, volcanic tuff, soil Mostly flat, but steepens about 100 feet to the north. YES YES Runoff evidence throughout designated PRS boundary including matted vegetation and channelization. Runoff terminates into tributary of Canada del Buey north of site Rills forming due to the amount of run-on coming onto site. YES Storm drains (asphalt channel) discharge directly onto site. NO No operational impact. YES As mentioned in #7. Veenis, Steve Redirect run-on away from site. NO Misc. windblown trash found around the area. 54-007(d) 23.3 5/5/2000 54-7 YES NO NO NO Septic distribution box located outside fence, north of building. Could not locate outfall (if it exists). Mostly native vegetation with mix of grasses, shrubs and pinon pine. Mostly flat with gentle slope to the north. YES NO Swales existing around site, but no channelization observed. bench or swales Runoff appears to terminate within the swales or bench above the canyon. None observed. NO No structural impact. NO No operational impact. NO No upslope drainage. Veenis, Steve NO 54-007(e) 23.3 5/5/2000 54-151 YES NO NO NO Septic system on mesa top north of 54-15 within fenced area. Mixed grasses, gravel, soils Generally flat with slope towards the northeast. YES NO Sheet flow runoff towards the north. A culvert exists just north of the fenced area which allows runoff from site towards the east. drainage ditch Minor flows from site terminate into the adjacent roadside ditch. None observed. NO No structural impacts. NO No operational impact. NO No upslope drainage. Veenis, Steve NO 54-015(a) 3.6 8/14/1997 YES NO NO NO PRS located inside building 54-18. Inside building - NO VEGETATION! NO NO NO NO NO R. Reynolds NO Building contains PRS. 54-015(b) 27.0 8/14/1997 YES NO NO NO Mesita del Buey top, open pit, with waste storage in bottom. Disposal pit, no vegetation. Sides of pit. NO NO Hole in the ground. NO NO NO R. Reynolds NO 54-015(c) 3.6 8/14/1997 YES NO NO NO PRS site topped with dome covering. 100% protected from elements. NO NO NO NO NO R. Reynolds NO Site covered with protective domes, curbed all the way around inside, silt fence on north side per TA-EA-G SWPP plan. 54-015(d) 27.0 8/14/1997 YES NO NO NO Pad #2, west of pad #4. Sparse chamisa and wild flowers. a) Top of pad.
NO NO NO NO NO R. Reynolds Silt fence on watercourse side.
Large rock riprap on north side.
NO Silt fence and riprap maintained according to TA-54-G SWPP Plan. 54-015(e) 3.6 8/14/1997 YES NO NO NO PRS site topped with dome covering. 100% protected from elements. NO NO NO NO NO R. Reynolds NO Site covered with protective domes, curbed all the way around inside, silt fence on north side per TA-EA-G SWPP plan. 54-015(f) 27.0 8/14/1997 YES NO NO NO Midway on mesita del buey, for east corner pad #4 Pad sparsely covered with chamisa. a) Top of pad.
NO NO NO NO NO R. Reynolds 1) Silt fence rims entire area per TA-54 SWPP Plan details.
2) Large rock riprap on north side.