TA-15 Erosion

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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

15-001 3.6 8/28/1997 YES NO NO NO Active boneyard area north of 15-233. Grasses and wild flowers with heavy equipment and miscellaneous storage items. Rolling terrain. NO NO NO NO NO S. Veenis NO

15-002 3.6 8/25/1997 YES NO NO NO Heavy vegetation NO NO NO NO NO S. Veenis NO See attached sketch.

15-003 15.3 10/14/1997 15-310 YES NO NO NO Active firing site 15-310 "PHERMEX". Mineral soil surrounding metal plate used for shots. Graded level. NO NO No apparent channelization from firing pad. NO NO NO D. Mays Riprap, earth berm. NO Sediment transport does not seem to be a problem here.

15-004(a) 8.8 8/25/1997 YES NO NO NO Inactive firing site "C". Gravel, asphalt, grasses. NO NO NO NO NO S. Veenis NO See attached sketch.

15-004(b) 3.6 8/28/1997 YES NO NO NO Meadow setting - inactive firing area. Grasses and wild flowers. Rolling terrain. NO NO NO None. NO NO S. Veenis NO

15-004(c) 3.6 8/28/1997 YES NO NO NO Meadow setting - inactive firing area. Grasses and wild flowers. Rolling terrain. NO NO NO None. NO NO Firing sites a-B were regraded after decommissioning in 1967. The land is flat and covered with natural vegetation. S. Veenis NO

15-004(d) 8.8 8/25/1997 YES NO NO NO Inactive firing site "C". Gravel, asphalt, grasses. NO NO NO NO NO S. Veenis NO See attached sketch.

15-004(f) 33.2 8/25/1997 YES NO NO NO EF firing site (inactive). Pad barren, surrounding area heavily vegetated. YES YES Minor channels leaving pad. Meadow Minor. NO NO NO S. Veenis Visible debris standard - currently being cleaned up. Sand bags. BMPs installed (V. Hesch, 4/98). BMPs inspected: (V. Hesch, 4/98) YES To early to evaluate. if BMPs are effectively keeping sediment in place and reducing erosion potential.

15-004(g) 17.5 1/28/1997 YES NO NO NO Site is covered with grasses and annual herbaceous plants. YES NO Meadow. None, land slopes gradually toward a road located near the site. NO Only the inactive control chamber remains at the abandoned firing site. NO YES J.W. Heyser NO

15-004(h) 8.8 8/28/1997 NO NO NO NO Inactive firing site (H) west of Building 15-185, near Phermex. Mostly chamisa and grasses with barren soil in places. Firing pad flat. NO NO Heavy vegetation off pad. NO NO NO S. Veenis NO Some visible DU.

15-005(b) 3.6 8/28/1997 YES NO NO NO HE magazine/building. PRS is building - concrete with roof (not a watercourse site). NO NO NO NO NO S. Veenis NO

15-005(c) 3.6 11/4/1997 15-41 YES NO NO NO HE storage building on mesa top between Potrillo and Three Mile canyons. Site located adjacent to the roadway between 2-40 and 2-41. Area on south side of building is covered by asphalt and concrete. Significant ground cover on remaining 3 sides. NO NO NO No roof drains or storm drains on site. NO NO T. Lemke NO No evidence of discharge. Site is well vegetated.

15-005(d) 3.6 10/2/1997 15-30 YES NO NO NO Right next to R2 - south approximately 50 feet structure #15-30 storage material. Asphalt surrounding building. NO NO NO NO NO R. Reynolds NO

15-006(a) 15.3 10/14/1997 15-310 YES NO NO NO Active firing site 15-310 "PHERMEX". Mineral soil surrounding metal plate used for shots. Graded level. NO NO No apparent channelization from firing pad. NO NO NO D. Mays Riprap, earth berm. NO Sediment transport does not seem to be a problem here.

15-006(b) 15.3 8/25/1997 YES NO NO NO R-306 active firing site (ECTOR) Site mostly gravel covered. NO NO Sheet flow from pad into area storm drains, no outfall found. NO NO NO S. Veenis Normal firing pad debris. NO

15-006(c) 64.5 9/1/2000 YES NO NO YES 15-006(c) inactive firing pad (R-44)

16-008(b) land disposal Sparse vegetation on inactive firing pad. Area adjacent to pad also has minimal vegetative cover. Pad flat, but steepens over edge of cliff. YES YES Channelized flows leaving site. Sheet flow erosion evident. Channels on both sides of pad discharge over mesa edge. NO No structural impacts. NO No operational impacts. YES Minor drainage west to east. S. Veenis A series of silt fences were placed at the southern portion of site and straw bale check dams were placed adjacent to the eastern and western, portions of the site. Sandbags were placed to divert run-on at pertinent locations. A monthly inspection and maintenance program has been implemented for the BMPs. Visible lead shot and other firing site debris. NO Site impacted by Cerro Grande Fire. All visible debris was removed. Silt fencing was replaced. Straw wattles, mulch and seed were placed on slope below firing pad. The steep slope was hydromulched. Rock check dams placed within drainage. Original assessment completed on 8/25/97 (67.2).

15-006(d) 23.3 8/25/1997 NO NO NO NO Firing pad (006(d)) with adjacent land disposal (008(g)) R-45. Light vegetation and canopy. YES YES Swale directs flow from site. Three Mile Canyon Vegetated swale terminates flow in Ponderosa stand below site. NO NO NO S. Veenis NO

15-007(a) 3.6 10/2/1997 15-23 YES NO NO NO MDA-N north and east of Building 15-23. Grassy meadow, small patchy areas of semi-open exposed soil. NO NO NO NO NO R. Reynolds NO

15-007(b) 40.2 8/28/1997 YES YES NO NO MDA Z on mesa edge. Debris with sparse chamisa vegetation. Mesa edge onto bench below. YES NO From exposed slope. Bench gradually sloped to canyon +/- 100 yards - bench is vegetated. Leaves and grasses indicate minor sediment transport. NO NO NO S. Veenis Clean up debris, stabilize slope. NO Visible (DU) depleted uranium.

15-007(c) 15.3 8/25/1997 YES NO NO NO Old shafts subsurface (4) old inactive shafts. NO NO NO NO NO S. Veenis Visible lead shot on one of the sites - should remove. NO

15-007(d) 15.3 8/25/1997 YES NO NO NO Old shafts subsurface (4) old inactive shafts. NO NO NO NO NO S. Veenis Visible lead shot on one of the sites - should remove. NO

15-008(a) 72.0 8/25/1997 YES NO NO YES Disposal area - edge of mesa (2) sites southern most site the worst. Within channel off mesa edge. Heavy vegetation up to disposal area. Rock outcrops. Site drops in tributary YES YES From mesa top into tributary. Coming up to mesa edge. NO NO YES From above meadow. S. Veenis Cord, metal, DU needs to be cleaned up. South site very messy. Visible shrapnel, DU, detonator cords and other debris were removed from both canyon edge sites. A series of silt fences were placed below each site. A weekly inspection and maintenance program has been implemented for the BMPs. NO

15-008(b) 67.2 8/25/1997 YES NO NO YES 15-006(c) inactive firing pad (R-44)

16-008(b) land disposal Sparse vegetation. Pad flat --> debris over edge of cliff. YES YES Channelized flows leaving site. Erosion visible on east side of firing pad. NO NO YES Drainage west to east. S. Veenis More sand bags, silt fence on down slope and more straw bales properly installed. A series of silt fences were placed at the southern portion of site and straw bale check dams were placed adjacent to the eastern and western, portions of the site. Sandbags were placed to divert run-on at pertinent locations. A weekly inspection and maintenance program has been implemented for the BMPs. NO Visible lead shot.

See attached sketch.

15-008(c) 8.8 8/28/1997 YES NO NO NO Disposal area west of 15-233. Slightly vegetated. Gradually rolling. NO NO Berm stops runoff on south side. NO NO NO S. Veenis Pick up visible DU and debris. Berm in good shape with partial vegetation. NO

15-008(d) 69.0 10/2/1997 15-22 YES NO NO NO Surface disposal area south of Building area TA-15-R22. Exposed hillside. Disposal area dumped off edge of hillside. YES YES Eroded out through side of hillside disposal area. Cut in hillside embankment. NO NO YES Parking and storage area drainage. R. Reynolds Some building rubble but not significant. NO

15-008(e) 10/2/1997 NO NO NO NO Unable to locate. This site is also listed in the RFI as unable to locate. NO NO NO NO NO T. Lemke NO

15-008(f) 57.3 11/4/1997 YES NO NO NO The mounds located near the I-J firing site on mesa top north of Potrillo canyon. This PRS is now located within TA-36 and is adjacent to PRS 36-004(e). Small fragments of depleted uranium were observed. Area is primarily bare sand. No canopy cover and very little ground cover. Site generally flat, but steepens toward Potrillo Canyon to the south. YES NO Runoff via erosional features were observed. Potrillo Canyon located immediately adjacent to site on the south edge. Rill erosion present at several locations on the site. YES Run-on from the adjacent asphalt roadway to the northeast. NO YES Sheet flow from surrounding area. T. Lemke Energy dissipaters at north end of site (points of run-on) and silt fences or straw bales at south end to control sediment transport. NO Almost no vegetation on site. Soil is loose sand. Evidence of erosion exists.

Trash on site includes depleted uranium, metal, plastic, Plexiglas, and wood scraps.

15-008(g) 23.3 8/25/1997 NO NO NO NO Firing pad (006(d)) with adjacent land disposal (008(g)) R-45. Light vegetation and canopy. YES YES Swale directs flow from site. Three Mile Canyon Vegetated swale terminates flow in Ponderosa stand below site. NO NO NO S. Veenis NO

15-009(a) 3.6 10/2/1997 15-20 YES NO NO NO Active septic tank servicing building R20, pot, sink, urinal. Under cover - concrete and asphalt. NO NO NO NO NO R. Reynolds NO

15-009(b) 8.8 8/26/1997 YES NO NO NO Septic/outfall not located (inactive) R-45. NO NO NO NO Could not locate outfall. NO S. Veenis NO

15-009(c) 71.5 8/25/1997 YES NO NO YES Septic on mesa - discharge directly into canyon. Light canopy, grasses. Tank on mesa, discharges into canyon. YES NO Outfall pipe only, no surface runoff affecting buried tank. NO YES Septic outfall. YES Tributary to canyon upstream. S. Veenis None pending data assessment. Silt fencing was installed within the channel at two locations. Photographs were taken are available within the master files. NO

15-009(d) 3.6 10/2/1997 15-63 YES NO NO NO Old septic tank TA-15-63, tank R-63. Grass and weeds. NO NO NO NO NO R. Reynolds NO

15-009(e) 44.7 8/25/1997 YES YES NO NO Septic will be filled with concrete. Grass, scrub oak. Bench setting. YES NO Located on slope, runoff evidence. Near site NO YES Outfall pipe into drainage. YES From upper mesa top. S. Veenis NO

15-009(f) 3.6 10/2/1997 15-183 YES NO NO NO Septic tank located northwest of TA-15-183, no longer in service. Ground cover. NO NO NO NO NO T. Lemke NO

15-009(g) 3.6 10/14/1997 15-205 YES NO NO NO South of Building 15-310, along fire road 95, septic tank. Thick vegetation. Flat, gradual slope to fire road. NO NO No apparent run-off from PRS to fire road. NO NO NO D. Mays NO Blue sign reads "S.T. Reg. No. LA-21 TA-15-205"

15-009(h) 8.8 8/25/1997 YES NO NO NO Septic appears to be rerouted to SWSC. NO NO No concern. NO NO Outfall tied to SWSC. NO S. Veenis NO

15-009(i) 3.6 8/28/1997 YES NO NO NO Active septic from 15-233 (no outfall found). Mostly grass. Gentle slope. NO NO NO NO NO S. Veenis NO

15-009(j) 15.8 7/28/1997 YES NO NO NO Located just southeast of 15-R-285, approx. 1/4 mile from Canon de Valle (approx. 50') Due to sampling operations, ground over site has less vegetation than surrounding area, which is 75-100% vegetated NO NO YES South side of building 15-285 may contribute run-on to the site. NO NO T. Lemke NO

15-010(a) 8.8 10/2/1997 15-23 YES NO NO NO Septic tank located within MDA-N. New grass coming in. NO NO NO NO NO R. Reynolds NO

15-010(b) 3.6 10/2/1997 15-8 NO NO NO NO Septic tank abandoned - TA-15-8 outfall piped to edge of Three Mile canyon. Tank at edge of canyon. North of 15-R-8. Tank structure with outfall. NO NO NO NO NO R. Reynolds NO

15-010(c) 51.5 10/14/1997 15-92 YES NO NO NO Drainage from abandoned bunker west of Building 15-185. Medium vegetation. Slope increases flow towards culvert southwest of 15-185. YES YES Concrete chute into CMP. Concrete channel/CMP controlling sediment transport. Discharges do extend to tributary of Water Canyon. None observed. YES Parking lot access road northwest of 15-185. NO YES Sheet flow collects in drainage ditch - small drainage area. D. Mays Stabilization with asphalt/concrete. NO

15-011(a) 3.6 10/2/1997 YES NO NO NO Sumps for building drainage - all sumps and trenches drain to area catch basin. All paved or asphalt. NO NO NO NO NO R. Reynolds NO

15-011(b) 87.0 10/2/1997 NO YES NO NO Deep cut discharges right into Canyon de Valle. All exposed soil. a) At point that leaves 15-011(b)

c) Cut that opens up into canyon YES YES Eroded channel. YES Three other PRSs run-off drains to YES EPA04A093 YES Storm Water run-off drains to this site. R. Reynolds Clean up trash and debris. Place erosion controls - velocity stabilizers at termination of drainage up top. NO Trash, debris, pipe material.

15-011(c) 87.0 10/2/1997 NO YES NO NO Deep cut discharges right into Canyon de Valle. All exposed soil. a) At point that leaves 15-011(b)

c) Cut that opens up into canyon YES YES Eroded channel. YES Three other PRSs run-off drains to YES EPA04A093 YES Storm Water run-off drains to this site. R. Reynolds Clean up trash and debris. Place erosion controls - velocity stabilizers at termination of drainage up top. NO Trash, debris, pipe material.

15-012(a) 11/4/1997 NO NO NO NO This site was not able to be located in the field. This PRS was also not located for inclusion in the RFI Work Plan NO NO NO NO NO T. Lemke NO

15-012(b) 15.3 8/28/1997 YES NO NO NO Flat area behind 15-285. Contaminated soil recently excavated. No vegetation. NO NO No photo/out film. NO NO NO Depressed area with bermed sides, run-off from surrounding terrain does not enter site. S. Veenis Revegetate bare soil. NO

15-013(a) 3.6 10/14/1997 15-192 YES NO NO NO Removed tanks in 1950s. Uphill northwest of Building 15-184. Cable trays, grasses. Flat. NO NO NO PRS on top of mound between Buildings 15-184 and 15-185. NO NO D. Mays NO

15-013(b) 3.6 10/14/1997 15-184 YES NO NO NO Removed tanks in 1950s. Uphill northwest of Building 15-184. Cable trays, grasses. Flat. NO NO NO PRS on top of mound between Buildings 15-184 and 15-185. NO NO D. Mays NO

15-014(a) 33.7 10/2/1997 15-183 YES NO NO NO Outfalls from former firing sites west of TA-15-183 Primarily ground cover, some canopy cover, some forest litter. YES YES Several small natural channels. Mesa top Multiple small rills. YES Runoff from adjacent buildings and asphalt areas NO NPDES outfall EPA06A123 is located within PRS 15-014(a) but is no longer active. YES Sheet flow from surrounding area. T. Lemke NO Some areas with bare soil and limited vegetation, very little potential near edge of mesa top (primarily rock).

15-014(b) 33.7 10/2/1997 15-183 YES NO NO NO Outfalls from former firing sites west of TA-15-183 Primarily ground cover, some canopy cover, some forest litter. YES YES Several small natural channels. Mesa top Multiple small rills. YES Runoff from adjacent buildings and asphalt areas NO NPDES outfall EPA06A123 is located within PRS 15-014(a) but is no longer active. YES Sheet flow from surrounding area. T. Lemke NO Some areas with bare soil and limited vegetation, very little potential near edge of mesa top (primarily rock).

15-014(c) 10.6 10/2/1997 15-242 YES NO NO NO Sink drain outfall on west side of TA-15-242, concrete splash guard beneath outfall. Ground completely vegetated with grasses. NO NO YES Run-off from building. NO NO T. Lemke NO

15-014(d) 39.8 10/14/1997 15-185 YES NO NO NO Drop inlet (15-014(l)), 18 inch CMP inlet (15-014(e)), 18 inch CMP outlet (15-014(d)). Drop inlet receives cooling water from floor drains in 15-185 and cooling tower. Vegetation thick - close to 75%. Standing water on 10/14/97. YES YES 18 inch CMP leading to constructed drainage ditch. Drainage ditch leads to Water Canyon. No apparent sediment transport. YES Parking lot south of Building 15-185. NO YES Sheet flow into constructed drainage ditch. D. Mays NO Cooling tower provides most of flow through these PRSs at about 300-800 gal/day, discharged substantially at one time.

15-014(e) 39.8 10/14/1997 15-185 YES NO NO NO Drop inlet (15-014(l)), 18 inch CMP inlet (15-014(e)), 18 inch CMP outlet (15-014(d)). Drop inlet receives cooling water from floor drains in 15-185 and cooling tower. Vegetation thick - close to 75%. Standing water on 10/14/97. YES YES 18 inch CMP leading to constructed drainage ditch. Drainage ditch leads to Water Canyon. No apparent sediment transport. YES Parking lot south of Building 15-185. NO YES Sheet flow into constructed drainage ditch. D. Mays NO Cooling tower provides most of flow through these PRSs at about 300-800 gal/day, discharged substantially at one time.

15-014(f) 15.8 11/4/1997 15-263 YES NO NO NO Site of outfall from TA-15-263. Outfall has been removed. Located on mesa top northwest of Three Mile canyon outfall previously discharged into a man-made channel on the north side of the building. Limited vegetation in area surrounding the building. No canopy cover. NO NO YES Possible run-on from roof of TA-15-263. NO NO T. Lemke NO Outfall has been removed. No evidence of discharge or erosion at the site.

The outfall has been removed and there is no evidence of the outfall or its drainage path.

15-014(g) 55.5 10/2/1997 15-203 NO YES NO NO Cooling water - 15 feet east of northwest corner of Building 15-203. Exposed soil. YES YES Minimal evidence of run-off around side of Building R50. YES Roof run-off. YES EPA 04A093 and oil transfer line leaking mineral oil onto area. YES Hillside run-off co-mingles with roof run-off. R. Reynolds Remove stained oil, clean up trash. NO 12 a) Oil stained soil and trash in drainage area up next to building.

15-014(h) 8.8 10/2/1997 15-40 YES NO NO NO 1) Northwest of Building 40 approximately 100 feet away to east.

2) 60-100 feet north of building.

3) Storm drain - 12 inch corrugated metal pipe draining to Three Mile. Three unique discharge points. NO NO NO NO EPA 04A102 - tagged inactive TA-15-40.

EPA 04A103 - tagged inactive TA-15-40E. NO R. Reynolds NO #1 - Photo graphic lab

#2 - non-contact cooling water

#3 - Buried storm water drain 12 inch CMP.

15-014(i) 3.6 10/2/1997 15-194 YES NO NO NO Northwest corner of Building 194 - appears to be broken asphalt drainage area leading to 15-014(j). NO NO NO NO NO R. Reynolds NO

15-014(j) 61.3 10/2/1997 15-50 YES NO NO NO Corner of Building 15-50 - north side. Channeled drainage around building - all soil with asphalt lining (broken in spots). YES YES Deepening channel. YES Roof run-off, EPA 04A093, hillside drainage oil line running through channel - fixtures appear to be leaking. YES EPA 04A093 (from 15-203) YES Hillside drainage. R. Reynolds Remove stained oil. Place BMPs (oil booms and dams) to catch oil in run-off. NO Oil straining in drainage area.

15-014(k) 3.6 10/2/1997 YES NO NO NO Sumps for building drainage - all sumps and trenches drain to area catch basin. All paved or asphalt. NO NO NO NO NO R. Reynolds NO

15-014(l) 39.8 10/14/1997 15-185 YES NO NO NO Drop inlet (15-014(l)), 18 inch CMP inlet (15-014(e)), 18 inch CMP outlet (15-014(d)). Drop inlet receives cooling water from floor drains in 15-185 and cooling tower. Vegetation thick - close to 75%. Standing water on 10/14/97. YES YES 18 inch CMP leading to constructed drainage ditch. Drainage ditch leads to Water Canyon. No apparent sediment transport. YES Parking lot south of Building 15-185. NO YES Sheet flow into constructed drainage ditch. D. Mays NO Cooling tower provides most of flow through these PRSs at about 300-800 gal/day, discharged substantially at one time.

15-014(m) 21.5 8/25/1997 YES NO NO NO Outfall to ditch. YES YES Roadside. Roadside ditch YES YES 04A143 from 15-306. NO S. Veenis NO

C-15-001 15.7 8/28/1997 YES NO NO NO Soil pile near 15-233 - at intersection of roadways. Moderate - surrounding area asphalt roads. Flat. YES NO Sheet flow over roadways. Road side ditch NO NO NO S. Veenis NO

C-15-003 15.8 11/4/1997 YES NO NO NO Pile of black magnetite on mesa top on the south side of Three Mile canyon. Little to no vegetation on the pile itself. Sparse vegetation around the perimeter of the pile. NO NO NO NO YES Sheet flow from surrounding area. T. Lemke NO No evidence of discharge or previous erosion. Vegetation around perimeter of site and the area is relatively flat.

C-15-004 43.9 8/25/1997 NO NO NO YES Old transformer site - on telephone pole within draining - transformers removed. Mostly canopy along channel banks - grasses below in channel. YES YES Site located within existing channel. NO NO YES Upstream sources. S. Veenis Flow dissipation and/or check dams NO

C-15-005 3.6 10/2/1997 15-1 YES NO NO NO Building 15-1 - old ramming from past activities next to R site road, structure no longer present. Removed in 1962. Weeds and grassy cover. NO NO NO NO NO R. Reynolds NO

C-15-006 3.6 10/2/1997 15-7 YES NO NO NO Formerly TA-15-7, removed in 1962. Weeds and grassy cover. NO NO NO NO NO R. Reynolds NO

C-15-007 51.5 10/2/1997 NO YES NO NO Stained soil noted in 1988 ER site reconnaissance visit. Transportainer placed over it. Area was sampled in 1997. Site was recommended for NFA in RFI Report. Sandy, small gravel area. Area generally surrounded with asphalt. Mostly flat as adjacent parking area. YES YES Small rivulets leading to drainage channel. Tributary of Canon de Valle west of site. Sand and silt deposition only evidence at site. YES Parking lot and adjacent road. NO YES Only below site and not actually on site where spill occurred. R. Reynolds NO

C-15-010 8.8 10/2/1997 15-20 YES NO NO NO South approximately 10 feet from 15-R-20. Inactive diesel tank - removed in 1966. 50% pavement, 50% exposed soil where tank was removed. NO NO NO NO NO R. Reynolds NO

C-15-011 10.6 10/14/1997 15-185 YES NO NO NO Former location of gasoline UST south of Building 15-185. 100% asphalt. Very gradual slope, if any. NO NO YES Run-on from building and/or pavement does not reach below surface due to asphalt paving. NO NO D. Mays NO ER testing revealed NO comments.

C-15-012 3.6 10/14/1997 15-184 YES NO NO NO Removed tanks in 1950s. Uphill northwest of Building 15-184.

NOTE: This PRS is the same site as PRS 15-013(b). Accordingly, the information from that PRSs AP 4.5 Part B evaluation has been copied directly onto this form. (Note by D. Mays 12/12/97) Cable trays, grasses. Flat. NO NO NO PRS on top of mound between Buildings 15-184 and 15-185. NO NO D. Mays NO

C-15-013 3.6 10/14/1997 15-184 YES NO NO NO Removed tanks in 1950s. Uphill northwest of Building 15-184. Cable trays, grasses. Flat. NO NO NO PRS on top of mound between Buildings 15-184 and 15-185. NO NO D. Mays NO