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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 18-003(a) 27.3 8/5/1997 NO NO YES NO Sites are underground inside security fence of Kiva 1, not located near a watercourse. Area surrounding sites is bare soil. NO NO Septic tank and holding tank. Both drain to underground drain field located between the two security fences. NO NO NO T. Lemke NO 18-003(b) 27.3 8/5/1997 NO NO YES NO Sites are underground inside security fence of Kiva 1, not located near a watercourse. Area surrounding sites is bare soil. NO NO Septic tank and holding tank. Both drain to underground drain field located between the two security fences. NO NO NO T. Lemke NO 18-003(c) 62.3 4/3/1998 18-32 NO NO YES YES Tank is located on the canyon floor, but a storm water catch basin adjacent to site discharges directly into Three Mile Canyon. Area primarily bare soil with some light vegetation. Flat lying area. YES YES Flows from west of site enter along a defined channel into catch basin. Evidence of sheet flow from the PRS boundary also enter into the catch basin in the northeast corner of site. Catch basin within PRS boundary has outfall which discharges into canyon. None observed. YES Run-on from west of PRS boundary along fence line. NO NO T. Lemke Erosion control matting around PRS boundary to impede sediment migration into adjacent catch basin. Jute mat laid to impede surface water run-off and for erosion control. BMP, coconut husk matting rolled into "silt log" at ends, was installed approximately May 1998. NO 18-003(d) 20.8 8/4/1997 NO NO YES NO Septic drainfield located in Pajarito Canyon floor. Ground vegetation, no canopy. Flat lying, gently sloping to the east. NO NO NO NO NO T. Lemke NO 18-003(e) 15.6 8/4/1997 NO NO YES NO Grass NO NO NO NO NO D. Mays NO 18-006 27.3 6/18/1998 18-168 NO NO YES NO PRS is former site of 6: stainless steel pipe that contained a uranium solution. Pipe was capped and did not daylight to environment. PRS located within Kiva I on the south side of TA-18-168. There is no vegetation present within the Kiva or between the 2 security fences surrounding the Kiva. Area is located in the bottom of the canyon and is relatively flat. NO NO No visible evidence of runoff. NO Building adjacent to site has no roof drains and no evidence of run-on was observed. NO NO Natural drainage patterns currently direct run-on away from the site. T. Lemke NO 18-010(a) 26.6 8/4/1997 NO NO NO YES Wetland-like vegetation. NO NO YES Roof drain/storm sewer from Building 18-30 NO NO D. Mays NO 18-010(b) 22.6 8/4/1997 NO NO YES NO Close, but not "in", confluence of Pajarito and Three Mile Canyons. NO NO YES Outlet carries water from canal fed by parking lot. NO NO D. Mays Remove trash from watercourse. NO 18-010(c) 22.6 8/4/1997 NO NO YES NO NO NO YES PRS is parking lot run-off. NO NO D. Mays NO 18-010(d) 46.2 8/4/1997 NO NO YES NO No vegetation, but a lot of concrete/gravel. YES NO Meadow, south of Bldg. 18-258 YES Almost 100% of uphill parking lot drains through this channel. NO NO D. Mays NO 18-010(e) 29.5 8/4/1997 NO NO YES NO Three mile canyon. Heavy vegetation at culvert outlet. YES YES Vegetation flattened at culvert outlet. Meadow in canyon floor. YES Run-on from asphalt areas and roof drains. NO NO T. Lemke NO Trash in drainage channel around culvert outlet. 18-010(f) 62.3 4/3/1998 18-32 YES NO NO YES Outfall from building 18-32 discharges into watercourse. Heavy vegetation directly in front of outfall opening. Little vegetation in surrounding area. Flat lying area within channel YES YES No evidence of recent run-off from outfall. Grass is growing around outfall opening as a result of periodic low flows. Channelization is result of discharge into canyon channel, not a result of the discharge from the outfall itself. Discharges from outfall discharge directly into Three Mile Canyon channel. None visible at end of outfall. Area above outfall is mostly asphalt covered. YES Outfall from building 18-32 may contain storm water and/or floor drain sources. NO YES Upstream flows from Three Mile Canyon T. Lemke Slope could be stabilized with vegetation outside motion detection area to reduce sediment migration potential. NO Evidence of minor erosion on area adjacent to fence above the outfall. 18-012(a) 59.2 8/4/1997 18-115 NO NO YES NO Outfall from Building TA-18-115 (Kiva 3). Pipe outlet on small slope, surrounding area relatively flat. YES NO Terminates in bottom of canyon. Small depression where storm water discharges from pipe. YES Roof drain in TA-18-116. NO NO D. Mays NO 18-012(b) 46.6 8/5/1997 NO NO YES NO Pipe outlet approx. 30 feet from natural channel in canyon floor. YES NO Storm water outfall. Terminates in natural channel in canyon floor. YES Roof drains, parking lots NO NO T. Lemke NO 18-012(c) 27.3 8/5/1997 NO NO YES NO Outfall from Building 18-141 discharges to vertical standpipe and infiltrates, not located near watercourse. Gravel and soil in standpipe at pipe outlet NO NO NO Previously connected to floor drains in 18-141. No longer active. NO NO T. Lemke NO 18-012(d) 12/18/1997 NO NO NO NO This PRS was unable to be located in the field and was therefore not evaluated. The RFI work plan states that the ER Program was unable to locate this site for sampling and the site is proposed for NFA. NO NO NO NO NO T. Lemke NO