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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
05-001(a) 45.0 5/1/2001   NO YES NO NO Steel barricade near old firing pit.  Structure removed in 1985.  Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.
05-001(b) 45.0 5/1/2001   NO YES NO NO Steel barricade near old firing pit.  Structure removed in 1985.  Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.
05-001(c) 73.5 8/27/1997   YES NO NO NO Abandoned, historical firing site used in 1940s, located in tributary to Mortandad Canyon near border with San Ildefonso Pueblo. Loose rock, minimal vegetative cover at site or below. Upper portin of site on gradual slope, which continues down drainage. YES YES Runoff evidence visible down drainage.     Tributary of Mortandad Canyon Rill upper reaches, gully (channel) down at lower portion of PRS NO No structures at site. NO No current operations. YES Upslope drainage onto site. Veenis, Steve Dependent upon extent of contamination, some type of sediment retention dam or berm is needed in a gully - discharge to San Ildefonso and LANL property. Jute matting, straw bale barriers and silt fence were installed within drainage channel below site in 12/98 by SAIC.  See file for photo documentation. NO See attached map.
05-002 23.5 8/27/1997   NO YES NO NO Disposal site of firing debris, edge of canyon where debris was pushed over the side. Small trees and shrubs, extensive grass-like plants. Steep slope off canyon rim. NO NO           NO   NO   NO   R. Reynolds     NO  
05-003 3.6 5/1/2001   YES NO NO NO Calibration facility near former 5-20.  Site is contained and is subsurface. Site is located within shaft and is subsurface. Site located on mesa top which is flat. NO NO There is no runoff evidence from this site.         NO No structural impact NO No operational impacts. NO   S. Veenis     NO Site was impacted by Cerro Grande Fire.  The site is however subsurface and all BMPs were place adjacent to the site for PRS 5-004.  Original assessment was completed on 6/1998.
05-004 49.7 6/15/1998   YES YES NO NO Past evidence of historic trench location and old septic tank.  PRS boundary extends over mesa edge onto lower "bench type" setting. Minimal vegetation mixed conifer canopy. Gradual on mesa top.  Boundary extends down steeper slope before leveling out. YES YES Sheet flow runoff from area into a natural channel.       The PRS boundary terminates at lower bench setting.  Several "alluvial fan" deposits were observed below site.  The runoff proceeds onto tributary of Mortandad. Sheet flow has started to erode drainage channel less than 6 inches deep. NO No structural impacts. NO No operational impacts. NO Upslope run-on minimal. S. Veenis   Site was reseeded and mulched.  Straw wattles were placed throughout the site. NO Original assessment was performed 8/27/97 with a submittal date of 1/7/98 to NMED.  Site was re-evaluated based on new PRS boundary information on 6/15/98.  Sediment is moving off PRS, especially within well defined channels.  The site was impacted by the Cerro Grande Fire.  BMPs were placed throughout the site to mitigate erosion potential.
05-005(a) 45.0 5/1/2001   NO YES NO NO French drain near old structure removed in 1985.  Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.
05-005(b) 53.7 5/1/2001   YES YES NO NO Former outfall from building at TA-5. Site located on mesa top which discharged down drainage onto bench. Very little vegetation, mostly loose rock . Outfall located on mesa, but outfall discharged onto slope YES YES Sheetflow runoff evidence exists throughout the site.  Drainage channels are natural. bench setting in tributary   Site runoff terminates into bench setting in tributary to Mortandad Canyon. Sheetflow erosion exists at site. NO No structural impacts. NO No operational impacts YES Natural upslope run-on is occurrring at site. Veenis, Steve   Site was reseeded and mulched.  Straw wattles are in place to mitigate erosion. NO Site was impacted by the Cerro Grande Fire.  BMPs were place to mitigate erosion potential. Orignal assessment was completed on 8/27/97.
05-006(b) 45.0 5/1/2001   NO YES NO NO Soil contamination area near structure removed in 1985.  Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.
05-006(c) 53.7 5/1/2001   YES YES NO NO Soil contamination near former building at TA-5. Site located on mesa top which discharged down drainage onto bench. Very little vegetation, mostly loose rock . Outfall located on mesa, but outfall discharged onto slope YES YES Sheetflow runoff evidence exists throughout the site.  Drainage channels are natural. bench setting in tributary   Site runoff terminates into bench setting in tributary to Mortandad Canyon. Sheetflow erosion exists at site. NO No structural impacts. NO No operational impacts YES Natural upslope run-on is occurrring at site. Veenis, Steve   Site was reseeded and mulched.  Straw wattles are in place to mitigate erosion. NO Site was impacted by the Cerro Grande Fire.  BMPs were place to mitigate erosion potential. Orignal assessment was completed on 8/27/97.
05-006(e) 45.0 5/1/2001   NO YES NO NO Soil contamination beneath former building TA-5-19 which was used between 1953 and 1958.  Building TA-5-19 was removed in1985. It was known to have used uranium.   Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.
05-006(h) 45.0 5/1/2001   NO YES NO NO Soil contamination area located near structure removed in 1985.  Located on bench setting above Mortandad Canyon. Vegetation mixed grasses, rocks, ponderosa canopy. Gently sloping towards canyon on the North. YES YES Runoff evidence exists throughout the bench with some channelization occurring in natural drainages.     Runoff terminates directly into Mortandad Canyon Sheet flow erosion is occurring due to the amount of flow coming from above. NO No structural impact. NO No operational impact. YES Run-on from mesa top is occurrring throughout the bench setting. Veenis, Steve   The site has been reseeded and mulched.  Straw wattles and contour felled trees are in place to reduce sediment migraton. NO The Cerro Grande Fire impacted the site.  BMPs have been installed throughout to mitigate erosion. The original assessment was completed on 8/27/97.