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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
16-003(a) 55.5 8/22/1997 16-410 YES NO NO NO Culvert on top of mesa discharges directly into Water Canyon, about 200' of CMP. Rock, vegetation. Over cliff into tributary of Water Canyon. YES YES 12" CMP.       Discharges onto bedrock. YES   YES EPA 05A053 TA-16-410 NO   S. Veenis     NO  
16-003(b) 33.7 12/5/1997 16-400 YES NO NO NO Sump and outfall on south side of TA-16-400.  PRS boundary extends to man-made channel west of 16-400.  Deleted NPDES outfall EPA 05A063. Ground cover.   YES NO         Rill erosion from storm water run-on to PRS boundary. YES Run-on from adjacent roadway to asphalt areas outside the HE area. NO   NO   T. Lemke     NO Outfall is no longer active.
16-003(f) 8.8 9/22/1997 16-304 YES NO NO NO Two inactive HE sumps asociated with Bldg. 16-304.  Outfall south of Building 16-308. Eastern corner of building - moderate vegetative cover. Gentle slope up next to building. NO NO           NO   NO   NO   R. Reynolds     NO Sump surrounded by concrete and covered with lid.
16-003(g) 3.6 2/24/1998 16-306 YES NO NO NO Two plugged sumps on east side of Building 16-306.  Both look the same, so there is only one photo. 100% asphalt. Flat. NO NO No run-off potential.         NO "All operations will be conducted on a dry sump basis." NO   NO   D. Mays     NO Not on water course list, which is appropriate (no erosion potential).
16-003(h) 29.1 8/22/1997 16-430 YES NO NO NO 16-003(l) are HE sumps

16-003(h) are the associated outfalls		 drainage has dense vegetation   YES YES discharge from sump to PVC pipe and into settling basin which overflows into channel Water Canyon bench   flow doesn't appear to reach the canyon   YES  asphalt channel into ditch YES  HE outfall 05A071 YES Upstream flow from north of building S. Veenis Should reconnect PVC pipe to sump outfall PVC pipe is disconnected from western most sump- settling sump is working NO  
16-003(i) 3.6 9/5/1997   YES NO NO NO Sump next to rest house (TA-16-265) west of TA-16-260. Sump covered and surrounded by asphalt.   NO NO           NO   NO   NO   T. Lemke     NO  
16-003(j) 17.5 9/5/1997   YES NO NO NO Drainage ditch adjacent to the roadway on the south side of Building TA-16-260. Channel filled with grass.   YES YES PRS is man-made drainage channel.   Mesa top SE of TA-16-260 South of TA-16-260, run-off flows through a culvert under the roadway and discharges onto the mesa top.   YES Roadway drains into channel. NO   NO   T. Lemke     NO Heavy vegetation present in channel and at discharge point.
16-003(k) 38.6 11/9/1998 16-260 YES NO NO NO 16-003(k) consists of 13 HE sumps, their drain lines, the outfall and the associated outfall 16-021(c) located behind 16-260. Sumps and trench are covered with iron sections and are both concrete lined. Trench and sumps located behind building 16-260 are located in flat area. YES YES Discharges from sumps and trench flow directly onto 16-021(c) drainage.  See site assessment for 16-021(c) for details. Water Canyon.   Flows discharge directly into tributary of Canon de Valle.  See 16-021(c) site assessment for details on the impact of surface water. YES Run-on entering into trench from storm events and parking lot behind 16-260 create run-on problems for 16-021(c). YES Inactive HE outfall, formerly NPDES 05A056. NO Upstream flow from north of Building 16-430. S. Veenis   Sandbags provide for run-on diversion NO Sandbags are disintegrating in places.



Site was re-assessed because the original assessment was performed on the wrong location.  The original assessment was completed on 8/22/97.
16-003(l) 29.1 8/22/1997   YES NO NO NO 16-003(l) consists of HE sumps; 16-003(h) consists of associated outfalls. Drainage with heavy vegetation.   YES YES Discharge from sump to PVC pipe and into settling basin which overflows into channel. Water Canyon.   Flow does not appear to reach canyon.   YES Asphalt channel into ditch. YES HE outfall, EPA-05A071. YES Upstream flow from north of Building 16-430. S. Veenis   PVC pipe is disconnected from western sump.  Settling sump is working. NO Should reconnect PVC to sump outfall.
16-003(m) 3.6 8/22/1997 16-380 YES NO NO NO Sump and outfall pipe. Enclosed within concrete, asphalt covered parking area. Flat area near building 16-380. NO NO Discharge from outfall turns into PRS 16-030(g).         NO   NO   NO   S. Veenis   Straw bale check dams within drainage below fish ladder NO  
16-003(n) 25.0 8/29/1997 16-342 YES NO NO NO Outfall adjacent to road, north of 16-342. Pine needles, very little vegetation. Steep incline leading from roadway. NO NO           YES Roadway rill discharge directly onto site. YES EPA 05A062 TA-16-342 YES   R. Reynolds     NO  
16-003(o) 27.3 8/29/1997   NO NO YES NO "Fish ladder" aeration flume from Building 16-340 into tributary of Canon de Valle. Thick vegetation - grass, reeds, canopy cover.   NO NO           NO   NO EPA-05A054, TA-16-340. NO   D. Mays Requires repair at 80 degrees in flume, at base of hill, to prevent constant leak.   NO  
16-003(p) 3.6 11/24/1997 16-340 YES NO NO NO Southeast of Building 16-340, in abandoned testing facility. Asphalt, sage brush, concrete sump.   NO NO           NO Operations discontinued NO   NO   D. Mays     NO Assessment data provided by information gathered from a field visit to the area on 8/29/97.
16-004(a) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-004(b) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-004(c) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-004(d) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-004(e) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-004(f) 31.0 8/29/1997   YES NO NO NO Old waste water treatment plant and sand filter/drying bed. 16-004 sites - drying beds/sand filter 100% exposed but beds are completed bermed and contained.  16-029(h) in the outfall from above process. a)  16-004 sites.

c)  Outfall steep side descending into water canyon.		 NO NO           NO   YES EPA 555035, TA-16-STP; inactive sanitary outfall 035. NO   R. Reynolds     NO  
16-005(c) 3.6 8/8/1997   YES NO NO NO Grassland covered areas.     NO NO           NO   NO   NO   C. McLean     NO  
16-005(d) 10.5 8/8/1997   YES NO NO NO See Photo (16-27) Heavy grasses with building on site.   YES NO Gentle swale run-off to SE   Swale/meadow Culvert under road to SE.   NO   NO   NO   S. Veenis     NO  
16-005(e) 22.3 8/8/1997   YES NO NO NO   a)  Actual land fill and soil spoils pile.

c)  Grassy meadow perimeter sites.		 Gradual sloped away from spoils area. NO NO Grass filled depression.         YES Road bed and open. NO   YES Road run-off and run-on directed on to site.  Depression to the south ponds 95% of run-on.  Culvert under road way discharges to site. R. Reynolds     NO See attached sketch.
16-005(f) 31.8 6/20/1999 16-260 YES NO NO YES Former septic system removed in 1965  Location identified in the OU1082 Work Plan Addendum 2 1995 shows SWMU located on mesa top.  Note that the SWMU is located within the boundary of MDA R but did not drain into main MDA R drainage channel. Little vegetation in bottom of channel, moderate coverage on mesa. Mesa top mostly flat, increase sloped drainage into canyon. NO NO        Runoff terminates into Canon de Valle below MDA R. Significant erosion along the sides of the channel and down the slope to the canyon bottom. YES Runoff from parking lot/building may cause sheet flow across the site. NO   NO Sheet flow from surrounding area. Veenis, Steve Repair damaged channel and stabilize channel sides with vegetation and riprap.  Flow dissipation or diversion would reduce impact to canyon.  These recommendations are for MDA R work.   NO 4/98: Erosion exists, potential exists for increased erosion damage.  Upstream from 16-260 outfall area +/- 1/4 mile.  Site re-scored to reflect the entire PRS boundary and to be consistent with PRS 16-005(f) which bisects the MDA from top to bottom.  The original assessment was performed on 09/05/1997.                6/99: Site re-evaluated based on new SWMU location (see site setting explanation).  16-005(f) did not drain into the main channel dissecting MDA R, it drained to the east of MDA R.  NFA of 16-005(f) approved by NMED 12/23/98.
16-006(c) 49.5 2/4/1998 16-370 YES YES NO NO Concrete septic tank w/ associated drain line which discharges at canyon rim +/- 300' south of tank through 4" VCP  exposed volcanic tuff, grass and pine needles  gradual slope increases to the south and eventually into Water Canyon YES NO  runoff from site is mostly sheet flow.  At outfall, a small/short channel formed as a result of past discharges near mesa edge. tributary to Water Canyon    Sheet flow run off flows onto bench setting to the south  rills have formed on supper slope west of 16-370.  Likely due to an asphalt lined channel which diverts parking lot runoff from the north of building onto slope. YES   Parking lot run-on form north of 16-370. NO   NO   S. Veenis Investigate plugging or re-routing asphalt channel run-on An earthen berm located at the southwest corner of 16-370 impedes run off to the lower portion of the PRS. NO Original assessment 8/22/97

Part B revised 1/12/98 due to SWAT meeting

Part B revised 2/4/98 due to inconsistencies in completion of RFI Report for this site.  Other local PRS were separated and assessed on their own.
16-006(d) 37.3 8/22/1997   YES YES NO NO Drainage swale adjacent to site.  Septic with outfall pipe. Grass, pine needles, ponderosa canopy. Gradually sloped to steeper area. YES YES Vegetated swale.     Filtrates before reaching Water Canyon.   NO   YES Septic outfall. YES Swale. S. Veenis     NO  
16-006(f) 14.0 2/4/1998 16-370 YES NO NO NO  Active septic system (SF89031R?) associated with building 16-370.  Building is currently inactive.  Rock, grass, pine needles   Sloped area west of 16-370, flattens out near tank site. NO NO           NO   NO   NO  Berm above tank, impedes site run-on S. Veenis   Earthen berm above PRS, impedes run-on to site. NO Original assessment 8/22/97.  Part B revised 1/12/98 due to SWAT meeting; score changed from 47.2 o 14.0.  Part B revised 2/4/98 due to inconsistencies in completion of RFI Report for this site.  Other local PRS were separated and assessed on their own.
16-007(a) 3.6 10/28/1997   YES NO NO NO Open meadow in flat lying area. Meadow grass. Flat lying area. NO NO           NO   NO   NO   R. Reynolds     NO Assessment data provided by information gathered from a field visit to the area on 9/22/97.
16-009(a) 12.7 10/20/1997   YES NO NO NO Area defined as soil contamination area (16-034(h) and (16-034(j)) Thick grass cover in meadow. Gentle slope of area leads east. YES YES Area under power line defined with natural channel-draining to east.  Some evidence of runoff exists from heavy rain.   Meadow Runoff does not appear to continue east past Anchor Ranch road. Some evidence of ponding and drainage from low lying area. NO Localized drainage. NO   NO   R. Reynolds Some form of contamination, possibly Uranium, was recently unearthed by trenching crew.  Site has not been cleaned up.  Recommend clean up and posting of the site.  Trench was at one time covered with plastic, which has now blown off and is no longer effective.  Note:  Site apparently was posted but barrier rope is laying on the ground with "Notice-Controlled Area" signs laying in grass, not attached to rope. 6 straw hay bales placed in drainage area.  Recommend upgrading hay bales to silt fence due to the nature of contamination. NO 1.  Bales are not staked down or held in place.  Drainage area does not produce large amounts of runoff.

2.  Could possibly be breached.
16-010(a) 38.4 7/25/1997   YES NO NO NO South of MDA-P- Sparse vegetative cover.   YES YES Erosion particularly noticeable along the fence line west of 16-010(a).   Asphalt swale and road bed Majority of run-off from this site follows road bed down to Canyon de Valle. Eroding down to tuff rock. NO   NO   NO   R. Reynolds Stabilize eroded SW corner to north corner with straw bales as SW run-off is transporting sediment freely.   NO  
16-010(b) 55.5 9/15/1997   YES NO NO NO "WX-3 SOP Controlled Flash Pad" just south (upslope) of MDA-P. Only occasional sparse vegetation, estimated <10%. Generally slopes to north towards MDA-P. YES NO Sheet flow under fence at north side of PRS.     Flows to asphalt-lined run-on diversion channel at south end of MDA-P project, then around east end of MDA-P to Canon de Valle. Several small rills leading to asphalt channel. NO   NO   NO Site is at top of slope so run-on is not a concern. D. Mays Revegetate within fence and between north fence and the asphalt channel. Earthen berm below flash pad has been fortified, and run-on diversion improvements have been recommended. NO This PRS is, by definition, an HE waste treatment area, so the "yes" for #12(a) is not evidence of poor housekeeping.
16-010(c) 47.2 10/17/1997 16-388 YES NO NO NO Burn ground at TA-16.  South of Canon de Valle. Sparse vegetation along perimeter fence. <10% in majority of burn site.  10-30% on slope south of burn unit. YES NO       South drainage to Canon de Valle. Hill erosion begins south of the site, outside the PRS boundary, and extends through the site.   Majority of erosion is on the slopes south of the burn unit. NO   NO   YES Runoff from the slope south of the PRS boundary is flowing onto the site. T. Lemke Straw bales or other energy dissipaters should be placed along the south perimeter fence as this is the source of erosion problems for the PRS. Work is part of the new HEWTF. NO The southern boundary of the PRS is on 10-30% slope with limited vegetation.  Evidence of erosion already exists.
16-010(d) 50.3 12/5/1997 16-399 YES NO NO NO Burn pad located at TA-16 burn ground. No canopy cover.  Very little ground cover.   YES YES Run-off flow in man-made channels along the north and west fences.       Rills along north and west fences.  Additional small rills radiating outward from the burn pad. NO   NO   NO   T. Lemke   Work performed as part of the new HEWTF. NO Very little ground cover.  Existing evidence of erosion.

Debris consists of ash and burned material.  Ash is scattered around the site where sheet flow could potentially transport it off site.
16-010(e) 14.0 10/28/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays     NO Assessment data provided by information gathered from a field visit to the area on 9/15/97.
16-010(f) 14.0 10/28/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays     NO Assessment data provided by information gathered from a field visit to the area on 9/15/97.
16-010(g) 46.0 12/19/1997 16-363 YES NO NO NO Building 16-363 NPDES outfall. Large rocks, gravel, some leaf litter. Approximately 20% slope on the south canyon facing slope. YES NO Outfall pipe discharges onto rock.  No channelization.     NPDES outfall drains to a tributary, then on to Canon de Valle. Sheet flow if anything.  Rocks are large enough to contain flow.  Gravel around discharge site helps keep erosion down.  Rock check dam could prevent further continuance. YES Parking lot and roof drain from 16-363. YES NPDES outfall # EPA 05A055. NO Major drainage 50 ft. to the east. R. Reynolds     NO Trash consists of waste asphalt, pieces of insulation, rags, paper trash and debris.
16-010(h) 8.8 9/15/1997 16-390 YES NO NO NO Brown concrete skirt on south side of Building 16-390. All concrete.   NO NO           NO On the contrary, the building prevents all run-off. NO Building 16-390 decommissioned. NO   D. Mays   Straw bale check dams located within drainages below burn grounds area. NO  
16-010(i) 14.0 9/15/1997   YES NO NO NO East side of TA-16 burn ground:  16-010(i) = channel; 16-010(n) = trough. Mixture of soil, stones, and grass/vegetation. About 10% NO NO           NO   NO Building 16-390 is decommissioned. NO   D. Mays     NO Trough removed.  Former burn pad at end of trough HE contaminated (16-010(n))

Drainage channel not contaminated (16-010(I))
16-010(j) 14.0 9/15/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays     NO  
16-010(k) 14.0 9/15/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays   Straw bale check dams located within drainages below burn grounds area. NO  
16-010(l) 14.0 9/15/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays   Straw bale check dams located within drainages below burn grounds area. NO  
16-010(m) 14.0 9/15/1997   YES NO NO NO Troughs at TA-16 burn ground. Upper area sparse; lower area relatively thick grass and shrubs. Area fans out southward from building 16-390. NO NO           NO   NO Building 16-370 labeled "Decommissioned". NO   D. Mays   Straw bale check dams located within drainages below burn grounds area. NO  
16-010(n) 14.0 9/15/1997   YES NO NO NO East side of TA-16 burn ground:  16-010(i) = channel; 16-010(n) = trough. Mixture of soil, stones, and grass/vegetation. About 10% NO NO           NO   NO Building 16-390 is decommissioned. NO   D. Mays   Straw bale check dams located within drainages below burn grounds area. NO Trough removed.  Former burn pad at end of trough HE contaminated (16-010(n))

Drainage channel not contaminated (16-010(I))
16-011 3.6 8/8/1997   YES NO NO NO Grassland covered areas.     NO NO           NO   NO   NO   C. McLean     NO  
16-012(a) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(a2) 3.6 10/28/1997   YES NO NO NO Open meadow in flat lying area. Meadow grass. Flat lying area. NO NO           NO   NO   NO   R. Reynolds     NO Assessment data provided by information gathered from a field visit to the area on 9/22/97.
16-012(b) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(c) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(d) 15.3 9/5/1997   YES NO NO NO Hazardous waste satellite storage area on west side of TA-16-260. Area surrounded by asphalt and gravel.   NO NO           NO   NO   NO   T. Lemke     NO No soil surrounding or within the immediate area of the PRS.
16-012(e) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(f) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(g) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(h) 15.3 9/5/1997   YES NO NO NO Listed as active or inactive satellite or less than 90 day storage, or interim storage for HE.  Rest houses around TA-16-260. Areas surrounded by asphalt.   NO NO Sites are located indoors.         NO   NO   NO   T. Lemke     NO Sites are located inside buildings.
16-012(t) 3.6 8/22/1997 16-370 YES NO NO NO Satellite storage unit near 16-370. Enclosed next to building. Flat parking area. NO NO           NO   NO   NO   S. Veenis     NO Original assessment 8/22/97

Part B revised 1/12/98 due to SWAT meeting

Part B revised 2/4/98 due to inconsistencies in completion of RFI Report for this site.  Other local PRS were separated and assessed on their own.
16-013 22.7 8/8/1997   YES NO NO NO   Combination gravel and grass. Just over 10%. YES YES Drainage channel from historic parking lot.   Swale by PRS 16-029(x)   Grass shows flow direction, but no soil transport observed. YES Roof drains and parking lot. NO   NO   D. Mays Remove trash from ditch   NO  
16-015(a) 8.8 10/10/1997 16-1081 YES NO NO NO PRS is site of former building, northwest of Building 16-1081 (manhole). Close to