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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
09-002 3.6 3/30/1998   YES NO NO NO Former burn pit.  Depression of 6-12 inches, surrounded by trees and grass. Pine trees appear to have grown in since burn pit decommissioned. Gradual slope to SE. NO NO           NO No nearby structures. NO   NO   D. Mays     NO  
09-003(a) 15.6 7/31/1997   YES NO YES NO Along side main drainage to - Pajarito Grassy banks and meadow. Gentle slope. NO NO           NO   NO   NO Sheet flow. R. Reynolds     NO  
09-003(b) 15.6 7/31/1997   YES NO YES NO Along side main drainage to - Pajarito. Grassy banks and meadow. Gentle slope. NO NO           NO   NO   NO Sheet flow R. Reynolds     NO  
09-003(e) 15.6 7/31/1997   YES NO YES NO Along side main drainage to - Pajarito. Grassy banks and meadow. Gentle slope. NO NO           NO   NO   NO Sheet flow. R. Reynolds     NO  
09-004(a) 3.6 7/15/1999 9-184 YES NO NO NO Inactive HE settling tank,  outfall ( 9-004(o)). Contain within building 9-184 in concrete vault. Sump within building flat. NO NO No runoff evidence at sump.     See outfall 9-004(o). None observed. NO No run-on NO Inactive NPDES outfall 05A066 onto 9-004(o) NO  Upslope drainage onto outfall location. Veenis, Steve   Plugged outfall NO  
09-004(n) 3.6 7/15/1999 9-43 YES NO NO NO Inactive HE sump,  outfall ( 9-004(o)). Contain within building and concrete vault. Sump within building flat. NO NO No runoff evidence at sump.     See outfall 9-004(o). None observed. NO No run-on NO Inactive NPDES outfall 05A068 onto 9-004(o) NO  Upslope drainage onto outfall location. Veenis, Steve   Plugged outfall NO  
09-004(o) 43.8 7/15/1999 9-48 YES NO NO NO Sump and outfall. Good coverage of grasses and ponderosa pine canopy. Sump within building flat, outfall discharged north of 9-48 onto slope below access road outside fenced area. YES YES Channel created from outfall discharges.     Tributary drainage (LaDelfe) received flow from outfall. None observed.  Channel vegetation with rock exposures minimizes erosion. YES Roof drains from 9-48 tie into outfall (verified in WSC report #25) YES Inactive NPDES outfall 05A068 YES  Upslope drainage onto outfall location. Veenis, Steve Remove debris. Plugged outfall NO Broken VCP, metal boxes and misc. debris found near outfall location.  Vegetated channel appears to be adequately impeding sediment transport within channel.
09-005(d) 8.8 6/3/1999   YES NO NO NO Septic tank and outfall into lagoon. Pine needles and sparse grasses. Flat trench. NO NO None observed.       None observed. NO No impact NO No operational impact. NO No run-on. Veenis, Steve     NO Photo mislabeled as 8-005(d).
09-006 22.6 7/31/1997   NO YES YES NO Septic tank removed from bench along side tributary flowing to - Pajarito. Grassy cover.   NO NO           NO   NO   YES natural sheet flow - does seem to pond at site but no exit. R. Reynolds     NO  
09-008(b) 30.3 6/3/1999   YES NO NO NO Inactive sanitary lagoon and outfall Grasses, exposed tuff and some barren areas. Flat lying area dug into tuff, outfall into grass lined channel. YES YES Outfall inactive, well defined channel with little evidence of recent flow. swale   Drainage channel with local sheet flow sources. None observed. NO No impact NO No operational impact YES Upslope run-on Veenis, Steve     NO Inactive areas.
09-009 58.8 6/3/1999   YES NO NO NO Inactive WWTF for TA-8. Mixed vegetation of grasses, pine needles and canopy with some barren areas. Sloped gradually to the north. YES YES Gullies have formed on both east and west end of WWTF which come together near inactive NPDES outfall.     Discharge directly into tributary drainage. Gully on both sides and below site. NO   YES Runoff from 9-42 is causing run-on and the gullying on eastern portion of site.  Inactive sanitary NPDES outfall 02S. NO Upslope run-on impacts especially on westside where gully comes onto site. Veenis, Steve Need dissipation on gullies, diversion upslope and sediment controls below inactive outfall.   NO  
09-011(b) 10.6 3/30/1998 9-39 YES NO NO NO Corner of parking lot, south of Building TA-9-39. Asphalt and gravel on SE corner of parking lot.  Grass on surrounding area. PRS itself flat, with slight slope leading to drainage ditches. NO NO           YES 20-30 feet of upslope parking area. NO   NO   D. Mays     NO  
09-011(c) 10.6 3/30/1998 9-38 YES NO NO NO Former location of solvent storage rack, behind Building 9-38. 100% covered with grass and/or asphalt.   NO NO           YES 20-30 feet of upslope parking. NO   NO   D. Mays     NO  
09-013 56.0 7/31/1997   YES NO NO NO Mesa top approach to rim of Starmers Gulch to Pajarito.  MDA "M." Re seeding efforts minimal at best. Large area = YES YES Formation of rill erosion channel down middle of PRS.       Most visible spots are down middle of flows out water bars and along north edge of site. NO   NO   YES Drainage control attempt w/ water bars not maintained and has eroded in many spots. East end of site was heavy sediment evidence going off site. R. Reynolds An earthen berm should be placed at the bottom of the site to contain sediment on site.  Additional silt fencing, check dams and reseeding is need throughout the site. Revegetated, berm and straw bales placed for sediment transport controls. BMPs installed 8/31/96. YES Needs maintained BMPs - permanent - hay bales no longer effective or maintained.
C-09-001 33.7 6/3/1999 9-31 YES NO NO NO South of 9-31 a pipe discharge from building floor drains (plugged). Grasses with some barren areas. Gentle slope to the south. YES NO Sheet flow into drainage swale.   swale Swale cirlces building to north. Rills forming in swale +/- 50' from site, mostly parking lot (not PRS). NO No impact NO No operational impact YES Natural run-on Veenis, Steve     NO