TA-3 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

03-003(a) 25.1 7/29/1997 YES NO NO NO TA3-SM-40 between 3-218 & 3-040. Broken asphalt surrounded by concrete pads and building. YES NO Runoff drain from PRS to storm water drain CMP located. Storm water Patchy asphalt leach to storm water drain. YES Roof drain runs across site to SW drain. NO NO R. Reynolds NO

03-003(b) 22.3 7/24/1997 YES NO NO NO Cemented areas around building. NO NO YES Run-on from roof of building contained by depressions in asphalt. NO NO C. McLean NO No soil, all asphalt and concrete.

03-003(m) 46.3 7/29/1997 YES NO NO NO Fenced in remediated soil area (capacitors) to 25 ppm with backfill. YES YES Both channels made on top of fill dirt from remediation. Runoff overfill dirt on top of PRS. YES Roof drain from building causing some soil to wash onto site, small channel from parking lot gives a little run on. NO NO C. McLean NO Soil is being washed onto site. Drainage on site has been riprapped.

03-003(p) 21.0 8/14/1998 3-142 YES NO NO NO Parking lot NE of Building 3-142. Paved with asphalt. Unpaved areas in center contained in 6" asphalt curb. Surrounding areas medium vegetation. Slopes toward SE. NO NO YES Roof drain from loading dock near south of PRS. However, main roof drain for Building 3-142 leads to channel at NW corner of PRS, then to a culvert. NO NO Channel at NW corner of PRS directs some run-on, in addition to the roof drain, into culvert which apparently passes under parking lot. David Mays Run-on diversion. Asphalt repaving. Berms (no maintenance required). NO

03-004(c) 3.6 12/16/1998 3-29 YES NO NO NO Located at the loading dock area of the CMR building. Asphalt. Parking lot. NO NO NO NO NO Jeff Walterscheid None required. NO

03-004(d) 15.8 12/16/1998 3-29 YES NO NO NO Located within the CMR perimeter. Mixed asphalt/grass. Level area next to building. NO NO YES Blow down outlet. NO NO Jeff Walterscheid None required. NO

03-007 8.8 12/3/1998 3-159 YES NO NO NO Within industrial area at the Sigma complex. Grasses. Level area around building 3-159. NO YES Small natural channeling. Mesa top. Sheet flow has caused small minor channeling. NO NO NO Jeff Walterscheid None required. NO

03-009(b) 12/3/1998 NA NO NO NO NO Could not locate, see file. NO NO NO NO NO NO

03-009(d) 64.8 2/3/1999 3-30 YES YES NO NO Construction debris surface disposal site consisting of asphalt, concrete, rebar and misc debris. Site heavily covered with asphalt, pine needles, and pine tree canopy. Flat lying on top of mesa, but steepens quickly into tributary drainage channel. YES YES Discharges from storm water culvert bisect PRS. Runoff either infiltrates or collects in drainage channel which bisects PRS. Tributary channel connects directly with Two Mile Canyon. A gully/drainage channel has formed from storm water culvert discharges through PRS. Most of disposal site is un-affected by the channel and appears to be stable, sediment does not appear to be migrating within the channel. YES Run-on from adjacent parking area and storage area to the south. NO NO Veenis, Steve Stabilization of banks at the culvert discharge point may be needed (ie; riprap). NO Visible concrete and asphalt are within channel, but appear to be providing protection against further erosion at site.

03-010(a) 69.0 7/29/1997 3-30 YES NO NO NO West of 3-30, near edge of roadway. Sparse weeds. Edge of roadway sloping west to canyon tributary of Two Mile canyon. YES NO Asphalt channel - direct run off from edge of PRS to storm water culvert Small rivulets beginning to form on remediated slope. YES Asphalt parkway from 3-30. Culvert discharges under remediated site and into adjacent drainage from sources above. NO NO R. Reynolds Post remediation. BMPs have been installed at the site including poly-jute, straw bales, silt fence and reseeding efforts. BMPs installed 11/20/94. Additional BMPs were installed 9/98 NO Flow dissipation and/or additional reseeding of remediated area should be completed.

03-011 38.6 7/29/1997 YES NO NO NO SW of SM-31 YES YES YES YES YES Parking lot 3/4 around site feeds drainage channel. R. Reynolds NO

03-012(a) 43.3 8/19/1997 YES NO NO NO Cooling tower from Sigma Building, flowing down to Mortandad Canyon. Pine, deciduous tree canopy cover. Also, thick grass. Flows down over several 6-10 foot steps on mesa top. YES YES Flowing at approx. 5 gal/min. Channel is well defined and well vegetated, so there is no concern for sediment transport. NO YES Outfall is NPDES permitted: EPA-03A022 / EPA-EPR138. NO D. Mays NO No BMPs in place; none required. It's a benign 5 gal/min flow.

03-012(b) 65.0 8/19/1997 3-58 NO YES NO YES Within channel at headwaters of Sandia Canyon. Flow directly onto tuff, then into Sandia Canyon channel. Sparse vegetation in surrounding areas. Outfall discharge drops quickly into tributary. YES YES 8" CMP, expected to increase flow with redirected TA-46 wastewater treatment effluent. Tributary of Sandia Canyon south of 3-22 Steam Plant. Outfall discharge is onto tuff. Existing sediments in channel and from upstream sources could be mobilized by flows. NO YES PRS is NPDES permitted under EPA-01A001. YES Run-on from NW direction, already treated by BMP (straw bales). D. Mays Straw bales to reduce run-on velocity; sand bags to channel culvert outlet into Parshall flume. BMPs installed 6/30/96. Straw bales and sand bags removed 8/99. NO There's not much soil left in the 10 feet between PRS 3-012(b) and Sandia Canyon tributary, so erosion potential is low at the PRS. Furthermore, since this will be a fairly constant flow rate, vegetation will establish itself along channel banks reducing erosion potential.

This PRS, 3-012(b), is IDENTICAL to 3-045(b). Reference: RFI Work Plan, OU 1114, Addendum 1, 5-27-1, July 1995.

03-013(a) 45.0 8/19/1997 YES NO NO NO Parking lot drainage from main TA-3 lot, flowing down to culvert under Diamond Drive. Channel mostly bare tuff; soil generally well vegetated. YES YES 42" CMP inlet, through channel, to 30" CMP under Diamond Drive. Vegetation holding remaining soil in place. YES Main parking lot at TA-3. NO NPDES outfall EPA-03A023 "Deleted 7/95." NO D. Mays Velocity dissipation at outlet of 42" CMP. NO No maintenance required on riprap velocity dissipater.

03-013(b) 45.0 8/19/1997 YES NO NO NO Parking lot drainage from main TA-3 lot, flowing down to culvert under Diamond Drive. Channel mostly bare tuff; soil generally well vegetated. YES YES 42" CMP inlet, through channel, to 30" CMP under Diamond Drive. Vegetation holding remaining soil in place. YES Main parking lot at TA-3. NO NPDES outfall EPA-03A023 "Deleted 7/95." NO D. Mays Velocity dissipation at outlet of 42" CMP. NO No maintenance required on riprap velocity dissipater.

03-014(b2) 46.3 8/19/1997 NO YES NO NO Outfall from wastewater treatment plant in TA-46. Thick wetland. Steep slope behind former fueling yard. YES YES 24" CMP Flows straight into Sandia Canyon wetland. Any soil has been washed away already, so outfall flows over bare volcanic tuff into THICK vegetation. NO YES Flow from NPDES permitted outfall, EPA-01A001. NO D. Mays NO

03-014(c2) 72.0 8/19/1997 3-166 YES YES NO NO Effluent from inactive wastewater treatment plant (3-166) flow into channel about 50 feet before passing under gravel road, then down slope into canyon. Some pine needles, otherwise, bare soil. Located on steep drop into canyon. YES YES 5 foot long culvert collects & discharges. Above Sandia Canyon wetlands. Well defined, but medium-sized channel - suspect low flow. YES Former WWTF area. NO NO D. Mays Energy dissipater or channel lining. NO Energy dissipater or channel lining.

03-014(k) 8.8 12/3/1998 3-2290 YES NO NO NO TA-3 wastewater treatment plant drying beds (upper beds). Beds are self-contained and made up of sand and gravel filter layers. Beds "k, l, and m" have grasses growing: Bed "n" has pea gravel on surface, original surface removed during an oil spill cleanup. Containment beds dug into the tuff. NO NO NO NO NO Jeff Walterscheid None required. NO

03-014(l) 8.8 12/3/1998 3-2290 YES NO NO NO TA-3 wastewater treatment plant drying beds (upper beds). Beds are self-contained and made up of sand and gravel filter layers. Beds "k, l, and m" have grasses growing: Bed "n" has pea gravel on surface, original surface removed during an oil spill cleanup. Containment beds dug into the tuff. NO NO NO NO NO Jeff Walterscheid None required. NO

03-014(m) 8.8 12/3/1998 3-2290 YES NO NO NO TA-3 wastewater treatment plant drying beds (upper beds). Beds are self-contained and made up of sand and gravel filter layers. Beds "k, l, and m" have grasses growing: Bed "n" has pea gravel on surface, original surface removed during an oil spill cleanup. Containment beds dug into the tuff. NO NO NO NO NO Jeff Walterscheid None required. NO

03-014(n) 8.8 12/3/1998 3-2290 YES NO NO NO TA-3 wastewater treatment plant drying beds (upper beds). Beds are self-contained and made up of sand and gravel filter layers. Beds "k, l, and m" have grasses growing: Bed "n" has pea gravel on surface, original surface removed during an oil spill cleanup. Containment beds dug into the tuff. NO NO NO NO NO Jeff Walterscheid None required. NO

03-014(o) 11.8 12/3/1998 3-2290 NO YES NO NO TA-3 waste water treatment plant drying beds (lower beds) on canyon bench south side upper Sandia Canyon (SW of landfill bridge). Grasses growing in containment beds. NO NO NO NO NO Jeff Walterscheid None required. NO

03-015 3.6 8/19/1997 YES NO NO NO East of Building 3-141. Thick grass & undergrowth. NO NO NO NO Former NPDES outfall EPA-04A140 "Deleted 8/95." NO D. Mays NO No problem here: Low slope, high vegetation, inactive outfall.

03-020(a) 3.6 10/7/1997 3-287 NO NO NO NO PRS was 32 gallon drum buried and covered with screen. Collected condensate from an air compressor. Drum has been removed, site located on north side of TA-3-287. Area covered with asphalt. NO NO Drum has been removed and the area backfilled and covered with asphalt. No evidence of site. NO Asphalt slopes away from area where drum was located. NO NO T. Lemke NO

03-020(b) 8.8 8/19/1997 YES NO NO NO 100% asphalt cover. NO NO NO Site under asphalt - no surface water concerns. NO Site under asphalt - no surface water concerns. NO Site under asphalt - no surface water concerns. D. Mays NO 3" iron pipe protruding from NE corner of pad is inactive, originating inside JCI Shop Building.

03-021 39.8 7/29/1997 YES NO NO NO Most of PRS is under fill, part not under fill close to 25% vegetated. YES YES Old NPDES outfall non-active shows wetness from rain previously in day. Sheet flow into old NPDES outfall channel, also part of PRS from upper PRS section. Outfall empties into Sandia Canyon. YES Sheet flow off "A" frame metal roof. NO NPDES outfall is non-active. NO C. McLean NO Possible sheet flow with drying cat tail area slowing flow and holding soil.

03-022 8.8 8/14/1998 3-1612 YES NO NO NO Former location of tank, about 50-75 feet due west of the SW corner of Building 3-1612, east of channel draining former EPA outfall 03A009 (TA-3-102) which was deleted in July 1996. Pretty well covered with gravel which can be used to identify the PRS. North of PRS - good pine needle cover. South of PRS - good grass cover. Gradual slope toward drainage channel west of PRS. NO NO NO North of PRS there is some rill erosion caused by storm water runoff from the driveway to 3-1612. However, this is diverted north of PRS. NO NO D. Mays Runpon diversion. NO

03-029 44.3 8/19/1997 YES YES NO NO On mesa top, adjacent to upper tributary of Sandia Canyon. Site 100% covered with base course for road construction. YES NO East of JCI road materials depot. SLIGHT, on east edge of PRS. NO NO YES D. Mays Remove trash/debris. Earth berm at edge of supply lot. NO Earth berm BMP requires little or no maintenance.

03-038(a) 8.8 12/16/1998 3-700 YES NO NO NO Former holding tank near south edge of LA canyon. Covered with grasses and gravel. Level mesa top. NO NO NO NO NO Jeff Walterscheid None required. NO Holding tank was originally used for industrial waste and neutralization. It was connected to the former industrial waste line which had additional connections to HRL facility.

03-038(b) 35.5 12/16/1998 3-738 YES NO NO NO Former manhole/ULR-33 is located on south edge of LA canyon on the west side of the bridge. Reclamation activities have taken place, area is covered with grasses and erosion control matting. PRS is just below canyon edge on steeper slope. YES YES Man made channel to aid in slope erosion control. Area has been reseeded following utility line placement. LA Canyon Small amount of run-off terminates along southern slope of LA canyon. None observed. NO NO YES Small amount of run-on from above hillside. Jeff Walterscheid None required. NO Manhole was originally part of industrial waste line which connected to the HRL facility on north side of LA Canyon.

03-042 29.8 8/19/1997 YES NO NO NO Between buildings. PRS is concrete pad; surrounding area covered with concrete, asphalt and/or gravel. YES NO Storm sewer carries runoff to Sandia Canyon. NO NO NO D. Mays Remove trash/debris. NO

03-043(b) 19.8 6/18/1999 3-225 YES NO NO NO Asphalt batch plany yard. Former storage tank area, now equipment staging area. Base coarse and gravel coverage. Flat lying area. NO NO Infiltration into gravel. None observed. NO No impact YES Heavy equipment staged on area where former tanks existed. YES Some minimal sheetflow run-on Veenis, Steve NO

03-043(c) 3.6 6/18/1999 3-40 YES NO NO NO NE corner of 3-40, former manhole tied to RLWF was D&D in 1984. Grass and asphalt coverage. Flat lying area. NO NO None observed. None observed. NO No impact. NO No operational impact. NO None observed. Veenis, Steve NO

03-043(d) 19.8 6/18/1999 3-225 YES NO NO NO Asphalt batch plant yard. Former storage tank area, now equipment staging area. Base coarse and gravel coverage. Flat lying area. NO NO Infiltration into gravel. None observed. NO No impact YES Heavy equipment staged on area where former tanks existed. YES Some minimal sheetflow run-on Veenis, Steve NO

03-043(h) 19.8 6/18/1999 3-225 YES NO NO NO Asphalt batch plant yard. Former storage tank area, now equipment staging area. Base coarse and gravel coverage. Flat lying area. NO NO Infiltration into gravel. None observed. NO No impact YES Heavy equipment staged on area where former tanks existed. YES Some minimal sheetflow run-on Veenis, Steve NO

03-045(a) 7.6 4/29/1999 3-22 YES NO NO NO An inactive outfall from the Steam Plant, TA-3-22, that was operational from the 1950s through May 1993. The outfall received water from floor drains in the basement, first floor, mezzanine, heater floor, platform, and roof drains, as well as steam condensate and floor wash water. Following a diesel fuel release from PRS 3-036(j) in 1991 associated with two diesel tanks at TA-3-22, the soil around the outfall area was removed and replaced with clean fill as part of a corrective action. Site is fully vegetated with grasses and shrubs. Area flat lying. See photograph. NO NO NPDES outfall 04A151 was deleted from the permit 8/95. Pipe is no longer in place, probably removed when oil/water separator was removed in 1995. NO Run-on directed around site with storm drains. YES Former NPDES outfall 04A15. NO Very small amount from dirt road above site. Waltershceid, Jeff Remove (minimal) trash/debris. NO Site was re-assessed due to findings from the SWAT team meeting on 2/11/1999. The original assessment conducted on 08/19/1997 was performed at the wrong location.

03-045(b) 65.0 8/19/1997 3-22 NO YES NO YES Within channel at headwaters of Sandia Canyon. Flow directly onto tuff, then into Sandia Canyon channel. Sparse vegetation in surrounding areas. YES YES 8" CMP, expected to increase flow with redirected TA-46 wastewater treatment effluent. Tributary of Sandia Canyon south of 3-22 Steam Plant Outfall discharge is onto tuff. Existing sediments in channel and from upstream sources could be mobilized by flow. NO YES PRS is NPDES permitted under EPA-01A001. YES Run-on from NW direction, already treated by BMP (straw bales). D. Mays Straw bales to reduce run-on velocity; sand bags to channel culvert outlet into Parshall flume. Straw bales and sand bags removed 8/99. NO There's not much soil left in the 10 feet between PRS 3-012(b) and Sandia Canyon, so erosion potential is low. Furthermore, since this will be a fairly constant flow rate, vegetation will establish itself to control the flow, again reducing erosion potential.

This PRS, 3-012(b), is IDENTICAL to 3-045(b). Reference: RFI Work Plan, OU 1114, Addendum 1, 5-27-1, July 1995.

03-045(c) 57.7 4/29/1999 3-22 YES NO NO NO Inactive cooling tower outfall. A storm water culvert is co-located with the outfall. The site also receives run-on from the asphalt covered area on the south side of the building due to an asphalt curb. Outfall area lack vegetative cover, exposed rock below outfall make up a majority of the ground cover. Steep slope down to tributary channel, then gradual to Sandia wetland. YES NO Storm water runoff onto site, discharges onto rocks and into upper southern tributary of Sandia Canyon. Discharges into southern tributary of Sandia Canyon. Sheet erosion has removed most of soil to tuff boulders. YES Storm drain directly above site from culvert and sheet flow from south of 3-22. YES NPDES outfall under EPA-03A027. Also, fire hydrant testing discharges. NO Waltershied, Jeff Extend storm drain to bypass PRS. NO Site re-evaluated due to findings of the SWAT. The original assessment performed on 08/19/1997 was done at the wrong location.

03-045(e) 17.0 8/19/1997 NO YES NO NO Upper head reaches of Sandia Canyon, about 150 m below 3-045(g). Solid splash guard around outlet of 4" iron pipe, then some needles. NO NO NO 4" iron pipe connected to plugged floor drain at power plant. NO NO D. Mays Remove iron debris from area below splash guard. NO

03-045(f) 3.6 8/19/1997 YES NO NO NO About 10 feet from approx. 30 foot drop-off to bench. Domestic quality, mowed lawn. Minimal. NO NO NO Sink removed approx. 1980. NO NO D. Mays NO

03-045(g) 38.3 8/19/1997 3-1966 YES NO NO YES Outfall which discharges into Sandia Canyon is valved/locked. No discharges are allowed without approval from ESH-18 Sparse shrubs, sand and tuff. Near canyon bottom with moderate slope. NO NO 24" CMP, oblong cross section with splash pan. No discharges have occurred in recent history. Sandia Canyon above wetland +/- 1/4 mile. YES Storm water from parking lots and roadways within TA-3. NO NPDES outfalls discharge into channel upstream from PRS. YES Bowl directs sheet flow to channel at center. D. Mays Assurances that no discharges will be allowed from the basin Detention area collects local runoff which allows for natural attenuation. A locked valve is present as a discharge mechanism, but has not been used. NO

03-045(h) 38.3 8/19/1997 YES NO NO NO PRS collects runoff from Building 3-35 parking lot into 18" CMP. Small above-ground area before entering culvert, about 8 feet. YES YES 18" CMP Ditch by Eniwetok Road Culvert outfalls by "Non-Hazardous Waste" dumpster, then flows in drainage ditch to Eniwetok Road. Beginning to erode under security fence. NO See #10 below. YES EPA-03A024 NO D. Mays Remove trash/debris, put in nearby dumpster. NO

03-045(i) 46.5 8/19/1997 YES NO NO NO About 50% covered with asphalt. Under pine tree, some weeds on ground. Short slope into culvert between Eniwetok Road and Building 3-32. YES YES 12" CMP Ditch by Eniwetok Road. PRS is a ditch, with some evidence of sand & sediment transport. YES Parking lot, roof drain from Building 3-32. NO NO D. Mays NO Outlet of 12" CMP clogging up. Suggest clearing to prevent backup.

03-046 3.6 4/27/1999 3-22 YES NO NO NO 10,000 gallon holding tanks for blowdown treatment. Tanks have concrete curbed secondary containment. Enclosed by concrete containment vault. Flat area next to 3-22 NO NO None. Tanks enclosed within concrete containment area. No runoff NO None NO None NO None Veenis, Steve Secondary containment of holding tanks. NO Outfall from tanks is PRS 3-045(a). See recommendations for outfall

03-047(d) 15.3 9/2/1997 YES NO NO NO Just north of east stairs into Power Plant Building 3-22. Spurge grass. Nearly level. NO NO NO NO NO PRS is afforded protection by proximity of Building 3-22. D. Mays Good housekeeping. BMPs installed 9/30/95 (V. Hesch, 4/98). BMPs inspected: 9/30/95 (V. Hesch, 4/98) NO Site used for non-hazardous storage.

03-049(a) 36.8 7/29/1997 YES NO NO NO NPDES outfall runs through PRS. NPDES outfall runs into wetland growing over PRS. YES YES Channel and wetlands result of outfall No visible erosion due to wetlands holding soil. NO YES NPDES outfall directing water across PRS. NO C. McLean NO Wetlands has anchored soil down holding local erosion.

03-049(c) 10.6 8/28/1997 YES NO NO NO East side of Sigma.

3-049(d) at stack location.

3-049(c) - outfall from tank or steam site. Dense grass (lawn) NO NO YES NO NO R. Reynolds NO

03-049(d) 10.6 8/28/1997 YES NO NO NO East side of Sigma.

3-049(d) at stack location.

3-049(c) - outfall from tank or steam site. Dense grass (lawn) NO NO YES NO NO R. Reynolds NO

03-049(e) 10.6 8/28/1997 NO YES NO NO Associated with 3-049(a) - non contact cooling water discharge. This PRS is difficult to locate and define but RFI indicates that it is associated with 3-049(a). NO NO NO YES NPDES outfall No. EPA-034022 and EPA-EPR 138 TA-3-127. NO R. Reynolds N/A. NO

03-050(b) 3.6 6/18/1999 YES NO NO NO All sites related to stack emissions unable to perform an accurate assessment due to uncertainty of prevailing wind direction or a defined PRS boundary. NO NO NO NO NO NO

03-050(c) 3.6 6/18/1999 YES NO NO NO All sites related to stack emissions unable to perform an accurate assessment due to uncertainty of prevailing wind direction or a defined PRS boundary. NO NO NO NO NO NO

03-050(d) 3.6 6/18/1999 YES NO NO NO All sites related to stack emissions unable to perform an accurate assessment due to uncertainty of prevailing wind direction or a defined PRS boundary. NO NO NO NO NO Veenis, Steve NO

03-050(f) 3.6 6/18/1999 YES NO NO NO All sites related to stack emissions unable to perform an accurate assessment due to uncertainty of prevailing wind direction or a defined PRS boundary. NO NO NO NO NO Veenis, Steve NO

03-050(g) 3.6 6/18/1999 YES NO NO NO All sites related to stack emissions unable to perform an accurate assessment due to uncertainty of prevailing wind direction or a defined PRS boundary. NO NO NO NO NO Veenis, Steve NO

03-051(c) 12.7 8/14/1998 3-141 YES NO NO NO Parking lot at NE corner of Building 3-141. Based on map on page E-8 of the RFI Work Plan for OU1114, Addendum 1, July 1995. Site has been repaved recently for installation of new equipment so "oil stains" not located. 100% asphalt cover. Flat parking area. YES NO Grassy area. Evidence of runoff terminated in grassy area, east of parking lot and west of Eniwetok Road. Evidence of sheet flow. NO NO NO D. Mays Asphalt repaving. NO Trash generally on grass east of parking lot - miscellaneous trash and debris.

03-052(a) 34.6 10/22/1997 3-39 YES NO NO NO Drop inlet located on east side of TA-3-39. Ties into storm sewer and NPDES permitted outfall that was previously evaluated C-PRS. Area surrounding drop inlet is covered with concrete and asphalt. YES YES Evidence of storm water in the inlet. Drop inlet ties directly to underground storm drain. YES Storm water run-off from roof and adjacent dock area. Discharge into drop inlet. NO NO T. Lemke NO No soil is present at the site or in the surrounding area.

03-052(b) 39.8 7/29/1997 YES NO NO NO 2 outfalls and 3 inlets draining north and NW side of building. Inlet on west side is 75-100% ground cover. Remaining 2 inlets are 25-75%. YES YES Storm water outfall YES Run-on to the site originates from asphalt area adjacent to building TA-3-66 and from run-off from TA-3-66. NO YES Asphalt area adjacent to TA-3-66 contoured to direct run-off onto site. T. Lemke NO

03-052(c) 10.6 8/28/1997 YES NO NO NO Storm drains in and around shops building. Mostly paved and concrete cover. NO NO YES NO NO R. Reynolds NO

03-052(d) 34.6 9/2/1997 3-287 YES NO NO NO At southeast corner of building 3-287. Combination asphalt, concrete, grass, and base course. YES YES Asphalt channel to drainage. There is sediment buildup all around the storm drain inlet. Passes through PRS 3-054(b), then into Two Mile. Soil pretty much stabilized. YES Parking lot and walkways. NO NO D. Mays Remove wire from around storm drain inlet; remove bolts and other refuse from within inlet structure. Stabilization with asphalt. NO

03-052(e) 10.6 9/2/1997 YES NO NO NO Parking lot north of building 3-164. 100% asphalt. NO NO YES Parking lot. NO NO D. Mays NO

03-052(f) 45.0 8/19/1997 YES NO NO NO Parking lot drainage from main TA-3 lot, flowing down to culvert under Diamond Drive. Channel mostly bare tuff; soil generally well vegetated. YES YES 42" CMP inlet, through channel, to 30" CMP under Diamond Drive. Vegetation holding remaining soil in place. YES Main parking lot at TA-3. NO NPDES outfall EPA-03A023 "Deleted 7/95." NO D. Mays Velocity dissipation at outlet of 42" CMP. NO No maintenance required on riprap velocity dissipater.

03-054(a) 15.8 9/9/1997 YES NO NO NO North of Building 3-16 "Van de Graff". Thick grass. Gradual slope towards drainage swale running west from northwest corner of Building 3-16. NO NO NO Cooling tower which formerly fed this outfall has been removed. NO YES Sheet flow from upslope. D. Mays NO

03-054(b) 65.8 9/2/1997 3-316 YES NO NO NO Gully sloping down to Two Mile canyon. About 75% grass and tree cover. Gentle slope to the south. YES YES 48" CMP oblong cross-section. Flows down drainage ditch then through culvert under access road. Channel stabilized with vegetation, so future erosion unlikely. YES Parking lot run-off, etc. YES EPA 03A009. NO D. Mays Cattail area below outfall provides a natural filter for discharges coming from end of pipe. NO Site has already lost pretty much all moveable soil, so no further BMPs required.

03-054(c) 3.6 9/2/1997 YES NO NO NO PRS discharges into storm water drop inlet approximately 4 feet below grade. PRS is inside concrete and steel storm sewer system. NO NO NO NO Inactive outfall EPA 03A023. NO D. Mays NO This PRS should not have been on the WC list, since it is within an existing storm drain. All erosion potential covered at the storm sewer outlet. PRS 3-054(b).

03-054(d) 15.8 9/9/1997 YES NO NO NO North of Building 3-16 "Van de Graff". Thick grass. Gradual slope towards drainage swale running west from northwest corner of Building 3-16. NO NO NO Cooling tower which formerly fed this outfall has been removed. NO YES Sheet flow from upslope. D. Mays NO

03-054(e) 89.0 7/29/1997 3-29 YES NO NO YES Runoff drainage east of CMR Facility. Site located in storm water drainage channel. Channel is approx. 15-20 feet deep. Steep slope on drainage wall. YES YES Runoff: Sheet flow over new fill. Outfall pipe discharges directly into Mortandad headwaters. Headwaters of Mortandad east of CMR building and south of Material Science Building. Small eroded channels over new fill material around culvert. NO YES NPDES outfall 03A021 is active from process within CMR building. YES Sheet flow from steep canyon walls directing Storm Water across PRS. R. Reynolds FM should address erosion around culvert and rock wall. Reseed area to establish vegetative cover. Clean up wind blown trash in drainage. Gabion to support culvert. YES Visible erosion around culvert should be addressed. Revegetation needed. Clean up blown trash.

03-055(a) 61.0 9/9/1997 3-16 NO YES NO NO Outfall from roof drains and floor drain from 3-16. Approximately 25% - rocks, grass, small trees. Outfalls into steep slope towards Two Mile canyon. YES YES 8" iron pipe. End-of-pipe discharges directly to drainage entering canyon. YES Roof and floor drains. NO Building 3-16 "Van de Graff" inactive. NO D. Mays NO Channel stabilized by small rocks, especially "splash guard" flat rock at outfall.

03-055(b) 73.5 7/29/1998 3-30 YES NO NO NO Inactive drain outfall on west side of Building 3-30, toward north side. PRSs includes drainage channel approximately to exercise track. Thick pine needle cover on all upslope areas prevents violent run-on.

Channel itself very bare. Tuff exposed in many places. Drains to southwest leading to Two Mile Canyon YES YES PRS is eroded bottom of channel leading southeast. Approximately 0.25 to 0.5 mile to main drainage of Two Mile Canyon. Runoff has washed channel nearly clear of all sediment. YES Some run-on from asphalt driveway around Building 3-30. NO Site inactive. YES Natural runoff from channel filtered by pine needle cover. D. Mays NO

03-055(c) 12/3/1998 NA NO NO NO NO This PRS is described as an outfall. It could not be located in the field and was therefore not evaluated. NO NO NO NO NO T. Lemke NO

03-055(d) 11/25/1997 NO NO NO NO This PRS is described as an outfall. It could not be located in the field and was therefore not evaluated. NO NO NO NO NO T. Lemke NO

03-056(c) 69.7 9/16/1997 3-223 YES NO NO YES Former transformer clean-out/storage area. PRS extends to the north and west from edge of canyon to just above watercourse in tributary of Sandia canyon. Site is exposed due to remediation effort. Mostly soils and rock which is currently covered with plastic. Located on exposed northwest and north facing slope. YES NO Sheet flow runoff from slope directly into tributary of Sandia Canyon. Northern site has natural channels created from runoff of adjacent parking area. Runoff terminates directly into tributary below site. There are additional sources of potential contaminants immediately upstream from the site (TA-3 Power Plant 3-22). Visible erosion difficult to see due to plastic cover. Any current erosion processes have been impeded while remediation effort is ongoing. YES Parking lot above PRS. NO No operational impact NO Run-on is diverted by asphalt berm and channel. Veenis, Steve PRS originally covered with plastic after initial remediation effort. BMPs were upgraded November 1997.

Due to the close proximity to a watercourse and the slope on which the PRS exists current BMPs should be frequently inspected and closely maintained. Curlex geomat were placed over the entire slope in November 1997. Asphalt berm diverts storm water away from slope on top of site. Original BMPs installed 7/31/95. NO The score had previously been recorded as (52.6) but was modified because the runoff termination point (question 6b) was not properly noted on the form.

03-056(h) 15.3 10/7/1997 3-105 YES NO NO NO Former container storage area located on the west side of TA-3-105. Primarily gravel and crushed tuff. Very little vegetation. NO NO NO NO NO T. Lemke YES

03-056(k) 3.6 12/16/1997 3-66 YES NO NO NO Loading dock on north side of TA-3-66, Sigma Building. Area completely covered by asphalt or concrete. Level parking & storage area. NO NO None visible. Roof drains drain off in separate direction. NO NO NO R. Reynolds NO

03-059 10.6 9/16/1997 YES NO NO NO PRS is parking lot behind TA-3-271. Former salvage yard. Site is covered with asphalt. NO NO YES Much of site is parking lot. NO NO T. Lemke NO Area is covered with asphalt and vegetation is present along the fence line.

C-03-005 22.3 9/16/1997 YES NO NO NO Within asphalt batch plant between transformer TA-3-1333 and adjacent AST. Area covered with gravel. NO NO YES Drainage from surrounding yard and storm water running off of adjacent AST. NO NO T. Lemke NO Area compacted and stabilized with gravel.

C-03-010 10.6 9/9/1997 YES NO NO NO Old concrete pad, near Building 3-16 "Van de Graff". Asphalt. Flat. NO NO NO Upslope asphalt beds to this PRS. NO YES Uphill sheet flow run-on. D. Mays NO

C-03-014 22.3 7/29/1997 YES NO NO NO Located on asphalt pad on west side of building TA-3-35. Asphalt pad. NO NO YES Run-on from building 3-35 and adjacent asphalt areas. NO NO T. Lemke NO Site is covered with asphalt and adjacent non-asphalt areas are covered with vegetation.

C-03-016 15.3 9/16/1997 YES NO NO NO Oil distributor clean-out bin with hinged lid located inside asphalt batch plant. Clean-out bin is covered (100%). Evidence of petroleum products on ground around bin. No cover in this area (0%). NO NO NO NO NO T. Lemke NO PRS is covered with a structure and surrounding area stabilized with gravel.