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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 33-001(a) 35.0 1/10/2000 YES NO NO NO MDA-E on western edge, within fenced area. Fenced in area has mixed grasses with several bare, rocky areas. Flat with gradual slope towards the south. YES YES Gradual slope has evidence of sheet flow towards the south. Subtle swale. Chaquehui Canyon just below mesa's edge +/- 50' to the south. NO Sheet erosion inferred from runoff evidence. NO No operational impact. NO No upslope impact. Veenis, Steve NO Score modified to reflect actual site conditions. Original assessment completed 8/1/97 scoring 40.2. 33-001(b) 35.0 1/10/2000 YES NO NO NO MDA-E on western edge, within fenced area. Fenced in area has mixed grasses with several bare, rocky areas. Flat with gradual slope towards the south. YES YES Gradual slope has evidence of sheet flow towards the south. Subtle swale. Chaquehui Canyon just below mesa's edge +/- 50' to the south. NO Sheet erosion inferred from runoff evidence. NO No operational impact. NO No upslope impact. Veenis, Steve NO Score modified to reflect actual site conditions. Original assessment completed 8/1/97 scoring 40.2. 33-001(c) 35.0 1/10/2000 YES NO NO NO MDA-E on western edge, within fenced area. Fenced in area has mixed grasses with several bare, rocky areas. Flat with gradual slope towards the south. YES YES Gradual slope has evidence of sheet flow towards the south. Subtle swale. Chaquehui Canyon just below mesa's edge +/- 50' to the south. NO Sheet erosion inferred from runoff evidence. NO No operational impact. NO No upslope impact. Veenis, Steve NO Score modified to reflect actual site conditions. Original assessment completed 8/1/97 scoring 40.2. 33-001(d) 35.0 1/10/2000 YES NO NO NO MDA-E on western edge, within fenced area. Fenced in area has mixed grasses with several bare, rocky areas. Flat with gradual slope towards the south. YES YES Gradual slope has evidence of sheet flow towards the south. Subtle swale. Chaquehui Canyon just below mesa's edge +/- 50' to the south. NO Sheet erosion inferred from runoff evidence. NO No operational impact. NO No upslope impact. Veenis, Steve NO Score modified to reflect actual site conditions. Original assessment completed 8/1/97 scoring 40.2. 33-001(e) 35.0 1/10/2000 YES NO NO NO MDA-E on western edge, within fenced area. Fenced in area has mixed grasses with several bare, rocky areas. Flat with gradual slope towards the south. YES YES Gradual slope has evidence of sheet flow towards the south. Subtle swale. Chaquehui Canyon just below mesa's edge +/- 50' to the south. NO Sheet erosion inferred from runoff evidence. NO No operational impact. NO No upslope impact. Veenis, Steve NO Score modified to reflect actual site conditions. Original assessment completed 8/1/97 scoring 40.2. 33-002(a) 15.7 2/2/1999 33-86 YES NO NO NO MDA K septic system and outfall. Mostly chamisa, pinon-juniper with exposed barren areas within PRS boundary. Gently sloped to the east. YES NO Minimal evidence near septic outfall area. Inactive and no longer being used. mesa top Runoff appears to infiltrate into surrounding area. None observed NO NO NO Veenis, Steve Sandbags have been placed within the fenced area of 33-86 to impede run-on onto the PRS. NO Septic tank is empty and the inflow lines have been disconnected. 33-002(b) 3.6 2/2/1999 33-86 YES NO NO NO Sump/drywell is rubble filled, unlined seepage pit with concrete cover. Mostly chamisa, pinon-juniper with exposed barren areas near PRS boundary. PRS itself has concrete cover. Gently sloping to the east. NO NO No runoff evidence for the pit. None observed. NO None. NO NO None Veenis, Steve Sandbags have been placed within the fenced area of 33-86 to impede run-on onto the PRS. NO 33-002(c) 15.3 2/2/1999 33-86 YES NO NO NO Sump is unlined seepage pit. Dead cattails, sparse vegetative cover. Mostly crushed tuff and concrete with little organic material. Gently sloped to the east. NO NO No runoff evidence observed. None observed. NO None. NO NO None. Veenis, Steve Sandbags are placed within the fenced area (33-86) to impede run-on to site. NO Original assessment done on 8/1/97 at correct site but on wrong PRS. The original assessment was for the outfall and not the sump. The score change was not significant. 33-002(d) 26.2 2/2/1997 YES NO NO NO Outfall from NPDES 04A147 (inactive). Dead & down, grass. Pinon-juniper. Gently sloped to the east. YES NO Matted down vegetation with drainage swale present. mesa top Runoff appears to infiltrate into surrounding area before discharging into Chaquehui. None observed. NO YES Inactive NPDES outfall 04A147 (deleted 7/95). Hose attached to outfall; some mud under hose. NO Veenis, Steve Sandbags in place within fenced area (33-86) to impede run-on to site. NO Original assessment done on 8/1/97 at correct site but on wrong PRS. The original assessment was for the storm outfall and not the NPDES outfall. The score change was not significant. 33-002(e) 22.7 2/2/1999 33-86 YES NO NO NO Storm drain line from building 33-86. Dead cattails, pinon/juniper vegetative cover, weeds and grasses. Generally flat with gentle slope to the east. YES NO Evidence of past runoff into gentle swale. No recent discharges evident. mesa top Runoff appears to infiltrate into surrounding soils. None observed. YES Roof drain from 33-86 is the source of the discharge. NO NO Veenis, Steve NO Original assessment done on 8/1/97 at correct site but on wrong PRS. The original assessment was for the NPDES outfall and not storm drain outfall. The score change was not significant. 33-004(c) 8.8 5/24/1999 33-96 YES NO NO NO Flat lying area north of bunker (33-95). Mostly vegetated with grasses, sage and juniper. Flat area. NO NO Infiltration. No evidence. None observed. NO No impact NO No operational impact NO None Veenis, Steve NO 33-004(g) 14.0 8/1/1997 YES NO NO NO At edge of canyon. Building abandoned in mid 50's. NO NO NO NO NO R. Reynolds NO 33-004(h) 56.6 11/24/1997 33-20 YES NO NO NO Drainage from parking lot along side of fence
PRS in entire parking lot around TA-33-20.Asphalt. YES YES Eroded channel along side of PRS between fence and PRS Run-off from building and parking lot converges at eroded channel approx. 3-4 ft deep discharges to Chaquehui Canyon. YES NO YES R. Reynolds BMPs - eroded channel. Repair and stabilize with placement of riprap or silt fence. NO Assessment data provided by information gathered from a field visit to the area on 8/1/97. 33-004(i) 39.8 8/1/1997 YES NO NO NO YES YES Outfall runs through culvert, through fence, into Chaquehui Canyon. NO NO YES Outfall in swale, down slope from Building 33-113. D. Mays NO 33-004(j) 85.0 8/1/1997 YES NO NO YES PRS within channel on mesa top. Outfall into established channel. YES YES Outfall no longer active. Evidence of run-off flowing in channel past outfall. NO NO YES Storm Water flows down surrounding slopes into man-made channel where outfall is located. T. Lemke Flow dissipater needed. Provide straw filter BMPs. BMPs listed for 33-010(c) NO No vegetation in bottom of channel. Storm Water can transport existing sediment in channel. 33-004(k) 14.0 8/1/1997 YES NO NO NO Site around bunker, supposed to have drain line coming from bunker. ER investigation could not find any evidence of line. Little ground cover on bunker hill. NO NO NO NO NO C. McLean NO 33-004(l) 27.0 8/1/1997 YES NO NO NO Outfall extends out from side cliffs. Primarily rock. Side of cliff. NO NO NO Inactive outfall from bunker, TA-33-89 NO NO T. Lemke NO 33-004(m) 8.8 5/24/1999 33-178 YES NO NO NO Septic 33-179 east of NRAO Satellite. Sparse vegetation with crushed tuff near septic, density increases downslope. Gently sloped to the east. NO NO None, infiltration is prevalent. Tributary NO No impact NO No operational impact NO None Veenis, Steve Unmaintained brush barrier +/- 75' below site. Parking area at 33-178 has an asphalt curb which diverts run-on from site. NO Maintenance of bursh barrier should not be required since effective and natural 33-006(a) 56.0 8/1/1997 YES NO NO NO 33-006(a) boundaries cover majority of TA-33 South Site. Shrapnel, depleted uranium and miscellaneous debris scattered throughout site. Slope varies throughout the site but is generally steeper towards the south. YES YES Man-made channel located at south end of site SE of old firing pad. All surface water drains towards the south towards a common discharge point for South Site. Rill erosion present throughout site. YES 33-008(a) - Old landfill contributes run-on to 33-006(a) 33-008(a) at head of drainage. NO YES Sheet flow from surrounding slopes and old activity areas. T. Lemke Visible debris should be cleaned up. Sand bag berms and straw bales in place as interim measure. BMPs installed 8/31/96. BMPs were installed within drainage in November of 1998 NO Shrapnel, depleted uranium and miscellaneous debris 33-007(a) 15.8 8/1/1997 YES NO NO NO Storm water culvert - primary confluence for conveyance of storm water. NO NO YES Culvert under roadway could possibly convey storm water to canyon, although Dorothy Hoard said culvert is plugged with solvent. Culvert is visible but "appears" to be plugged. NO YES Potential exists. R. Reynolds NO 33-007(b) 59.3 8/1/1997 YES NO NO YES Within established channel on mesa top depleted uranium and shrapnel in channel. Limited vegetation in channel and little to no canopy cover. YES YES Site ends at BMPs at old roadbed. Evidence of runoff in channel and along roadbed at end of site. BMPs (straw bales) in place within channel. NO YES NO sheet flow from surrounding slopes. T. Lemke Existing BMPs should be reestablished and maintained. Visible debris should be cleaned up. Sand bag berms and straw bales in place as interim measure. BMPs installed 8/31/96. NO Depleted uranium and shrapnel within channel. 33-007(c) 24.8 8/1/1997 YES NO NO YES Hill of sod, upslope from building 33-16, consisting of material from when uranium has been physically separated. Grass growing through geotexile mats (see photo). NO NO NO NO NO PRS extends to fence at top of slope, so theirs no run-on. D. Mays Sand bags were used to dam culvert west of 33-16. HDPE was placed over catcher boxes and sand bags were placed around boxes to secure the site. BMPs installed 9/30/96 (V. Hesch, 4/98). BMPs inspected: 9/30/96 (V. Hesch, 4/98) NO Looks stable w/ existing rolled mats. 33-008(c) 56.0 8/1/1997 YES NO NO NO Secondary bunch - Site located at head of drainage top. Starting at edge of cut into drainage. YES YES = 1.5 - 1.0 miles to Chaquehui Canyon. YES Parking run-off conveyed out culvert through middle of PRS. C-33-001 supplies run-on to 33-008(c) NO YES R. Reynolds Straw bale check dam was replaced with a silt fence directly below the culvert. NO ER installed BMPs = 3 tiers of straw bales installed down stream of site. Inspected monthly - 1st tier appears to have run-off passing around to south. Recommendation: Maintain BMPs.
33-008(c) supplies drainage to C-33-002 and 33-017.33-009 27.0 8/1/1997 YES NO NO NO Sight of former landfill. Gravel with light vegetation in some areas. 0 - 10% on mesa top, >30% over edge of mesa to canyon bottom. NO NO NO NO NO T. Lemke NO 33-010(a) 53.2 8/1/1997 YES NO NO NO Mesa top at edge of rim , Chaquehui Canyon located below. Canyon rim, rock sparse vegetation. Mesa edge into steeper canyon slopes. YES NO Evidence of run-off into natural drainages at mesa edge onto slope below. At rim of canyon natural drainages proceed down slope into canyon.. Minor evidence of sediment transport, mostly exposed volcanic tuff. NO NO NO R. Reynolds Visual surface debris removed 11/30/95. NO 33-010(b) 45.0 11/5/1998 33-89 NO YES NO NO Shelf about 60 feet below rim of White Rock Canyon, southwest of Bunker 33-89. Former location of ball of metal turnings. Some vegetation such as grass, but many tuff fragments and exposed soil. Slope on bench about 30%. Cliffs above and below nearly vertical. YES NO There is a drainage channel south of Bunker 33-89 leading to the canyon rim, shown on page 3 of the "VCA Plan for TA-33" 10/18/95. Where this flow hits the bench it has formed a gully toward east end of PRS. bench above Rio Grande Drains directs into White Rock Canyon (Rio Grande). Erosion originally observed was remediated and the site has achieved final stabilization. The PRS is located on volcanic tuff and future erosion should be limited in nature. NO NO YES Drainage channel south of Bunker 33-89 drains onto PRS. S. Veenis Several straw bale dikes in drainage near PRS boundary on mesatop. NO Debris is several timbers on bench, but not in gullies or rills mentioned in question 6(c). This assessment conducted from rim of canyon due to steep access.
Original BMPs have been left in place and have effectively reduced sediment migration. The site has achieved final stabilization and future BMPs will not be necessary. Site originally assessed on 7/30/98. Site re-assessed to determine if final stabilization had occurred on November 5, 1998.33-010(c) 60.5 8/1/1997 YES NO NO YES PRS on slope above established channel. Site covered with straw, no canopy cover. Slope drains into adjacent channel then over mesa edge into canyon. YES YES Slope stabilized with straw covering. NO NO NO T. Lemke Old debris pile, shrapnel, plastic, wood, etc., scattered across slope. Revegetate slope after debris removal. Jute mat and mulch was placed on the disposal area to reduce the transport of contaminated sediment from the site into the drainage. Straw bale check dams and small earthen berms are situated upstream from the site to reduce flow velocities of surface water. BMPs installed 2/28/96 NO Old debris pile. Shrapnel, plastic, wood, etc. scattered across slope. 33-010(d) 45.0 5/24/1999 YES YES NO NO PRS is positioned at the rim of Ancho Canyon, in middle of gully approaching rim. Mostly exposed bedrock with sparse grasses and juniper canopy. Debris pile at rim of canyon mostly flat, steepens into sheer cliff over mesa edge. YES NO Runoff/run-on from surrounding area onto site and over cliffs Bench setting above canyon Bench setting +/- 100' vertical below site appears to capture much of the runoff None observed. YES Access road/berm run-off creates run-on to site. NO YES Natural topography creates run-on. Veenis, Steve NO Original assessment completed on 08/01/1997 by Robin Reynolds, site rescored based on a "rainy day" revisit performed by Steve Veenis and Rich Mirenda. Most of the visual surface debris removed BMPs installed 11/30/95. 33-010(e) 47.2 5/24/1999 33-2 YES NO NO NO Surface disposal site southeast of fenced Area 6. Moderate vegetation becoming more barren towards drainage channel. Flat near fence, but steepens toward drainage to the east. YES YES Natural channel formed +/- 75' southeast of fence corner. Runoff discharges directly into tributary drainage channel. Sediment is moving within PRS boundary. No direct evidence of rill/gully erosion. NO None NO No operations YES Upper portion receives natural run-on. Veenis, Steve Sediment retention above drainage channel. NO 33-010(h) 32.8 5/24/1999 YES NO NO NO Surface disposal site located within the northern part of South Site. A bowl shaped area (berm?) is the dominant feature. Mostly barren tuff with scattered grassess and rock outcrops. Gently sloped to the south. YES NO Runoff from a majority of South Site drains to a common drainage. Tributary Runoff terminates at mesa edge below South Site. None observed. NO None NO None NO Site located near top of local drainage basin. Veenis, Steve Straw bales placed within local drainage area. NO SGS clean soil staging area is being conducted within the area. 33-011(a) 33.2 8/1/1997 YES NO NO NO PRS is former storage area. Site primarily bare soil with light vegetation. Area surrounding PRS 25-75% vegetated. YES NO Surrounding mesa top Rills formed along eastern & western edge of site. Sheet flow across other areas. NO NO NO T. Lemke NO Little to no vegetation on site. Evidence of rill erosion. 33-011(b) 49.0 8/1/1997 33-178 YES NO NO NO Old Land fill. YES YES Erosion occurring at bottom of site. NO NO NO R. Reynolds NO 33-011(c) 8.8 5/24/1999 33-24 YES NO NO NO Near bunker and inactive firing range (33-007(b)). Sage and misc. grasses, some barren areas. Mostly flat with gentle slop to the east. NO NO Infiltrates, no runoff evidence observed. Tributary None observed NO Isolated from structures NO Isolated from operations NO None observed Veenis, Steve NO Site adjacent to SGS soil removal area 33-011(d) 34.6 10/8/1998 33-20 YES NO NO NO Drainage from parking lot along side of fence PRS in entire parking lot around TA-33-20. Asphalt covered. Very flat lying, used as parking lot. YES YES sheet flow runoff from parking lot Eroded channel along side of PRS between fence and PRS Run-off from building and parking lot converges at eroded channel approx. 3-4 ft deep discharges to Chaquehui Canyon, PRS is covered with asphalt. YES PRS is below asphalt covered lot. NO NO Local run-on from parking lot R. Reynolds NO Site rescored due to findings of the SWAT on 9/30/98. The PRS was found to be located beneath asphalt parking lot and therefore is not exposed to surface water or erosional processes. The original assessment was performed on 8/1/97. 33-013 10.6 8/1/1997 YES NO NO NO Asphalt, gravel/cold rock covered Level parking lot. NO NO YES Roof drain from portal (porch) on east side of building. NO NO R. Reynolds NO 33-014 15.3 8/1/1997 YES NO NO NO Mostly bedrock. NO NO NO NO NO R. Reynolds NO 33-015 50.8 5/24/1999 33-39 YES NO NO NO Incinerator (inactive) southeast of 33-39. Sparse grasses, crushed tuff with scattered pinon/juniper. Generally flat, trending east. YES YES Two distinct drainages - one on each side which then join together. Tributary of canyon - runoff commingles with larger drainage +/- 100' down slope. Rills forming below site and above defined channel. NO No impact NO No operational impact YES Natural upslope drainage. Veenis, Steve Diversion and/or dissipation may be appropriate. NO Misc. debris below site, probably not associated with PRS. 33-016 54.5 5/24/1999 33-23 YES YES NO NO Sump and outfall from inactive HE work. Sump contained within concrete, outfall discharged +/- 150' to the west. Sump totally enclosed, outfall discharged onto loose tuff and sparsely vegetated area. Flat lying near building, sloping steeper to the west. YES NO Sheetflow over tuff. Outfall discharged directly into tributary drainage. Mostly onto volcanic tuff, no erosion observed. NO NO YES Natural upslope drainage. Veenis, Steve NO Broken VCP found near outfall location. 33-017 22.3 8/1/1997 YES NO NO NO Behind Building 33-113. Asphalt and gravel near building; thick growth on hill. NO NO YES Building 33-113 roof. NO NO D. Mays NO C-33-001 56.0 8/1/1997 YES NO NO NO Secondary bunch - Site located at head of drainage top. Starting at edge of cut into drainage, YES YES = 1.5 - 1.0 miles to Chaquehui Canyon YES Parking run-off conveyed out culvert through middle of PRS. C-33-001 supplies run-on to 33-008(c). NO YES R. Reynolds NO ER installed BMPs = 3 tiers of straw bales installed down stream of site. Inspected monthly - 1st week appears to have run-off passing around to south. Recommendation: Maintain BMPs. 33-008(c) supplies drainage to C-33-002 and 33-017. C-33-002 8.8 8/1/1997 YES NO NO NO Drainage from PCB transfer. Chamisa and grass. Small depressions. NO NO NO NO NO R. Reynolds NO C-33-003 59.0 2/2/1999 33-114 YES YES NO NO Contaminated cinders near Main Site of TA-33, under old water tower. Cinders with weeds/grasses, pinon/juniper after entering into tributary drainage. Gentle slope to the west until steepening into the drainage channel. YES YES Contaminated soil has evidence of migration since the cinders are not typical of the local crushed volcanic tuff. Some cinders have migrated into the adjacent drainage channel. Runoff proceeds into tributary of Chaquheui Canyon approximately 50 feet from most of the source material. Rills are evident near canyon edge within the cinder material. YES Local run-on from site and roadway adjacent to site. NO None observed NO No impact Veenis, Steve Run-on controls would be most helpful. Sediment controls until site is stabilized NO The cinder material was originally moved from near PRS 33-007(c) for leveling purposes which has been found to have uranium. C-33-003(b) 35.5 2/2/1999 33-114 YES NO NO NO East of administrative building near Main Site of TA-33. Cinders with weeds/grasses adjacent to parking lot. Sloped area next to flat lying parking area near main building at TA-33 YES NO Sheetflow evidence onto asphalt parking lot. Runoff proceeds into storm drain catch basins which discharge into tributary of Chaquheui Canyon approximately 100 feet from most of the source material. Minimal sheetflow from sloped area. YES Minimal run-on from near roadway. NO No impact NO No drainage onto site. Veenis, Steve NO The cinder material was originally moved from near PRS 33-007(c) for leveling purposes which has been found to have uranium. The material will be included in the SGS project planned for FY99.