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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 14-001(a) 3.6 10/6/1997 YES NO NO NO Electrical manholes 26 inches x 32 inches x 32 inches - still active. Electrical manhole completely contained. NO NO NO NO NO R. Reynolds Include in OBOD SWPP plan. NO 14-001(b) 3.6 10/6/1997 YES NO NO NO Electrical manholes 26 inches x 32 inches x 32 inches - still active. Electrical manhole completely contained. NO NO NO NO NO R. Reynolds Include in OBOD SWPP plan. NO 14-001(c) 3.6 10/6/1997 YES NO NO NO Electrical manholes 26 inches x 32 inches x 32 inches - still active. Electrical manhole completely contained. NO NO NO NO NO R. Reynolds Include in OBOD SWPP plan. NO 14-001(d) 3.6 10/6/1997 YES NO NO NO Electrical manholes 26 inches x 32 inches x 32 inches - still active. Electrical manhole completely contained. NO NO NO NO NO R. Reynolds Include in OBOD SWPP plan. NO 14-001(e) 3.6 10/6/1997 YES NO NO NO Electrical manholes 26 inches x 32 inches x 32 inches - still active. Electrical manhole completely contained. NO NO NO NO NO R. Reynolds Include in OBOD SWPP plan. NO 14-001(f) 3.6 10/6/1997 14-43 YES NO NO NO Bullet test facility at 14-Q43 - east end. The bullet test facility is a mostly enclosed structure. An associated sump received debris from the firing chamber. NO NO NO The bullet test facility is mostly enclosed. NO NO Access to the environment is limited to materials that get into the sump associated with this facility. This sump was plugged in the summer of 1996. R. Reynolds NO 14-001(g) 53.3 2/7/1997 14-23 YES YES NO NO PRS 14-001(g) is a three sided blast shield that directs the force of detonations away from the nearby control building (TA-14-23). Exposed concrete firing pad, enclosed with blast shielding on three sides. Mostly flat YES YES Evidence of runoff from site, especially to the southeast. Central drainage area flows to the south into canyon Erosion features observed near the site NO Concrete firing pad and a three-sided blast shield. NO NO Firing pad is up gradient from the Central Drainage Area at TA-14. Samples taken from drainage channel show no migration of contaminants. J.W. Heyser Address erosion concerns with diversion or retention. NO 14-002(a) 51.5 10/6/1997 14-2 YES NO NO NO Decommissioned closed firing chamber. Chamber was dismantled and destroyed in 1973. It was used extensively for HE tests, many using uranium-238. Sand from ruptured sandbags also comprise this PRS. Asphalt area for 14-002(a). a) Asphalt area for 14-002 (a). YES YES Man-made channel conveying southwest from site. Tributary of canyon trending to the southeast into Canon de Valle. None at site, asphalt covered. YES Firing pad (removed earlier) NO NO R. Reynolds DX must maintain straw bale BMPs as needed. Two sets of straw bale barriers within channel below site to the southeast. NO Sand deposits are good visual evidence that bales are working. 14-002(b) 10/6/1997 14-34 NO NO NO NO Removed in 1950s after use. Site location supposedly west of 14-34, but not found. General area. NO NO Based on comments in 5. NO NO NO R. Reynolds NO 14-002(c) 36.8 10/6/1997 14-5 YES NO NO NO 14-002(c) is the building structure
14-002(d) & (e) located behind.a) Back side at 14-002(d) and 14-002(e). YES YES Storm water drain piped from entrance way to edge of canyon (all notes). Canon de Valle Minimal amount of runoff from site. Site drains to a natural drainage to Canon de Valle. Some rill erosion on the slopes of (d) and (e) and flow from 002(c) into building. NO NO YES Natural flow pattern onto 002(c), no other areas. M. Alexander Concrete structure, metal sphere, metal pieces, wood trash, pallets - recommend clean-up. NO 14-002(d) 40.8 YES NO NO NO YES YES Storm water drain piped from entrance way to edge of canyon (all notes). Canon de Valle Minimal amount of runoff from site. Site drains to a natural drainage to Canon de Valle. Some rill erosion on the slopes of (d) and (e) and flow from 002(c) into building. NO NO NO Natural flow pattern onto 002(c), no other areas. M. Alexander Concrete structure, metal sphere, metal pieces, wood trash, pallets - recommend clean-up. NO 14-002(e) 47.8 10/6/1997 14-5 YES NO NO NO 14-002(c) is the building structure
14-002(d) & (e) located behind.a) Back side at 14-002(d) and 14-002(e). YES YES Storm water drain piped from entrance way to edge of canyon (all notes). Canon de Valle Minimal amount of runoff from site. Site drains to a natural drainage to Canon de Valle. Some rill erosion on the slopes of (d) and (e) and flow from 002(c) into building. NO NO YES Natural flow pattern onto 002(c), no other areas. M. Alexander Concrete structure, metal sphere, metal pieces, wood trash, pallets - recommend clean-up. NO 14-002(f) 10/6/1997 YES NO NO NO Junction box removed March 1952. Site not located. Apparent site for general site location. NO NO Site cannot be located, therefore run-off factors are not determinable. NO NO NO R. Reynolds NO 14-003 31.4 10/6/1997 YES NO NO NO Former burn area - remediated. Rim of burn pit is exposed soil. Sparse vegetation grows inside the pit. Now soil cap over excavated area. Cap is not vegetated. YES YES Soil cap cover is not vegetated. Some rivulets starting on top of soil cap. NO A horseshoe earthen rim on three sides of the pit is still present. NO YES None, area is flat with no drainage channels running through it. BMPs (straw bales) in place and appears to be working natural drainage potential directed around site to north. R. Reynolds Straw bales were installed is a semi-circle around the down-slope side of the area to be excavated. BMPs installed 9/30/96 (V. Hesch, 4/98). BMPs inspected: 9/30/96 (V. Hesch, 4/98) NO 14-004(a) 3.6 10/6/1997 14-22 YES NO NO NO Active magazine - Q-22. Building (bunker) completely covered. Parking lot and roadway. NO NO NO NO NO R. Reynolds NO 14-004(b) 3.6 10/6/1997 14-23 YES NO NO NO Single drum storage underneath Building 23 roof edge. Drum storage under protective cover. NO NO NO NO NO R. Reynolds Place in OBOD Unit. NO 14-004(c) 15.3 10/6/1997 YES NO NO NO Estimated site and photograph. Sparse vegetation. NO NO NO NO NO R. Reynolds NO 14-005 57.3 10/6/1997 14-23 YES NO NO NO Active open burn pit south of Building 23, 70 yards. Sandy, sparsely vegetated cover. PRS is 55 gal drum with no canopy. Generally flat. YES YES Rill erosion starting at burn pit. NO NO YES Directing on to site from above. R. Reynolds 1) Machined parts, cable, tarp - clean up.
2) Install sediment BMPs down gradient of burn pit in 2 or 3 stages.
3) Add to OBOD Unit SWPP PlanNO 14-006 47.1 10/6/1997 14-31 YES NO NO NO TA-14-31 sump/manhole - unknown if it is plugged. Manhole completely covered. YES YES This is an on grade covered drain to an HE sump then to an outfall. Canon de Valle Discharge of sump goes to a drainage on top of the mesa then to Valle Canyon. Drainage from outfall. YES Part of the parking lot and drain flow into the covered drainage. NO YES From up above (9). R. Reynolds 1) Place in OBOD Unit.
2) Plug outfall or determine, view WSC report, to determine if outfall is plugged, if not plug.NO 14-007 3.6 10/6/1997 14-19 YES NO NO NO Septic tank with leach field/drain field. Existing system tied into SWSC. Leach field underground. Visible outfall pipe 120 feet to northeast at marker flag. NO NO NO NO System bypassed to SWSC. NO R. Reynolds NO 14-009 53.7 10/6/1997 14-43 YES NO NO NO Surface disposal area on western firing area waste area consists of ruptured sand bags which were used for containment. Sand could be contaminated with lead, uranium, HE and beryllium. Sparse vegetative cover. Drainage from site slopes to canyon edge. YES YES From toe of slope at bottom of hillside edge, drainage channel slopes to the south towards canyon. Drainage channel below site flows directly into Canon de Valle. Within drainage adjacent to site. BMPs at site are preventing erosion from progressing. Sediment deposition at front edge of first set of hay bales. NO Blast mats, sandbags are diverting run-on. NO YES Contaminants in soil have potential to erode and leach into the watershed. A VCA is planned to remediate this site by removing the DU & HE contaminated soil. R. Reynolds DX must inspect and maintain straw bale barriers within channel and run-on diversion sandbags. Sandbags. Two rows of straw bales approximately 20 feet from each other. BMPs installed 11/30/96 NO See attached sketch. Debris consists of blast mats and misc debris on hill slope. 14-010 51.5 10/6/1997 14-2 YES NO NO NO Explosive waste sump adjacent to TA-14-2. May have contained HEs and toxic chemicals. Sump and drain line were removed. Sparse herbaceous vegetation in drainage area. Exposed soil and drainage approximately 75 feet. Channel slope varies to below asphalt edge. YES YES Man-made channel slopes to the southwest from site. Tributary drainage channel trends southeast towards Canon de Valle. None at site asphalt covered. YES Firing pad (removed earlier) NO NO Drainage area is relatively flat. R. Reynolds Maintain straw bale BMPs as needed. Two sets of straw bales installed 12/97. NO Sand deposits are good visual evidence that half bales are working. C-14-001 15.3 10/6/1997 YES NO NO NO Built in 1941 - burned down in February 1963. Visible surface disposal of soil piles and asphalt rubble piles. NO NO NO NO NO R. Reynolds Clean up asphalt rubble and waste soil piles. NO C-14-002 10.6 10/6/1997 14-34 YES NO NO NO Site under asphalt roadway. Roadway NO NO YES Building Q-34 drains to roadway. NO NO M. Alexander NO C-14-003 14.0 10/6/1997 14-6 NO NO NO NO North prep build removed in 1952. North of TA-14-Q6 and east of Q-14 approximately 70 feet. Grass and weeds for both sites. Both. NO NO NO NO NO R. Reynolds NO C-14-004 8.8 10/6/1997 14-7 YES NO NO NO Decommissioned electronics shop building. Remains of foundation only structure standing. Foundation surrounded by grass. NO NO NO NO NO R. Reynolds Place in OBOD unit SWPP Plan. NO C-14-005 14.0 10/6/1997 14-6 NO NO NO NO North prep build removed in 1952. North of TA-14-Q6 and east of Q-14 approximately 70 feet. Grass and weeds for both sites. Both. NO NO NO NO NO R. Reynolds NO C-14-006 19.7 10/6/1997 14-9 YES NO NO NO Middle of mesa top. Vegetative cover. Area relatively flat. YES YES PRS site located within a bar ditch on the west side of road. Mesa top. Follows bar ditch to utility corridor, then terminates there, area graded to prevent run-off. Utility corridor. YES Roadway on the west side of Building 22 drains to ditch approximately 100 yards off crowned road and at intersection. NO NO M. Alexander Concrete and asphalt pile, not in a watercourse. COPY "TERMINUS DESCRIPTION" 7/23/98: Follows bar ditch to utility corridor, then terminates there, area graded to prevent run-off. NO C-14-007 3.6 10/6/1997 14-10 YES NO NO NO On mesa top. Vegetative cover, grass and pine needles, ponderosa canopy. No slope, flat area. NO NO NO NO NO M. Alexander YES C-14-008 8.8 10/6/1997 14-45 YES NO NO NO Former magazine removed in 1952. Minimal grass and weed cover. NO NO NO NO NO R. Reynolds NO C-14-009 29.6 10/6/1997 14-13 YES NO NO NO On the mesa top, at the start of a small drainage. Spotty vegetation cover. Starts at greater than 10-30% then it goes to <10%. YES NO Mesa top. Within 20 yards at side, no visible flow. Any run-off flows onto a flat area. Soil exposed, no erosion. Area has always been like that for exposed soil. NO NO NO M. Alexander NO