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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 00-030(a) 8.8 8/5/1997 YES NO NO NO Mesa top near 6th St Warehouse Close to 25% all low ground cover. Mostly flat with little slope NO NO None observed NO NO NO C. McLean Reseeded after excavation. BMPs installed 8/31/96 NO Phase II drilling completed in early 1997. NOT submitted 9/97 Cleanup report Submitted. Site stable with no further actions needed. 00-030(b) 17.5 2/14/2000 YES NO NO NO Near storage units on 6th St. east of Zia Warehouses Total asphalt coverage Flat, with gentle slope to the south. YES NO Sheet flow over asphalt Roadway ditch sheetflow runoff to road ditch, SWMU located beneath asphalt (not exposed). None YES Adjacent roadway (minimal) NO None NO None Veenis, Steve NO VCA activities continued 7/30/96 to excavate and remove boxes as an extension to the original 1995 work. (EM/ER:96-417) Cleanup report Submitted. Site stable. No inspections or further actions needed. 00-003 17.5 7/24/1999 43-41 YES NO NO NO Surface disposal area near Western steam plant, located above a small subcanyon of LA Canyon (north side). Asphalt covered. Flat parking area next to old steam plant. YES YES Asphalt with curbing, no visible erosion. parking lot Drainage terminates within curbed parking area (behind the DOE complex) on the north side of LA canyon. None observed. YES Parking area and roof drains across PRS. NO No operational impact NO None observed. Jeff Walterscheid NO Listed as 0-003(g) in 8/18/98 letter.
Area is covered in asphalt. Runoff termination point was re-evaluated due to new information provided by ER. Original assessment performed 12/98.00-004 10.6 1/7/1998 21-1002 YES NO NO NO Drainage ditch east of 6th Street Warehouses. Flows south, through CMP, then west about 30 ft from Los Alamos Canyon rim. Ditch grassy, with tree-covered areas south of CMP and pine needle-covered area west of canyon rim fence. Broad, shallow ditch graded to gradual grate. NO NO YES Parking lot south of Building 21-1002. NO YES As trench runs west along Los Alamos Canyon rim, it collects sheet flow from area south of Building 21-1002 parking lot. D. Mays Geotextile in lower part of trench, degrading as vegetation becomes more well established. Also, riprap at rim fence to prevent gully deepening (not contiguous to PRS 0-004). BMPs installed 7/31/95 (V. Hesch, 4/98). BMPs inspected: 7/31/95 (V. Hesch, 4/98) NO This erosion assessment replaces the one by R. Reynolds 12/10/97. 00-010(a) 51.5 5/21/1997 YES YES NO NO Central wastewater treatment plant near Acid Canyon. Pine needles, grass, and rocks on ground. Ponderosa and scrub oak canopy. Flat area where former WWTP was located, slopes gently to steeper cliffs YES NO Two discharge channels from former WWTP have been disconnected. Flow from site is sheet flow in nature. Sheet flow from flat area north of former WWTF Sheet erosion off flat area near wastewater treatment facility. NO NO YES Natural run-on from area above site. S. Veenis Reseeding and run-on BMPs (i.e., earth/gravel) needed. NO Concrete/debris near watercourse. Earthen berm on north portion of site is helping to control sediment transport, but should be upgraded and maintained. 00-011(a) 10.5 6/25/1999 NO NO NO NO Open meadows east of Rendija Sportsman Club. Area too large too perform this assessment on, roads bisect meadow throughout, with heavy erosion on roadways. Former mortar impact area. YES NO Visible runoff throughout site. No applicable score for the site however. NO NO NO Veenis, Steve NO Site has dense poderosa canopy with gravel and dirt roads cross cutting throughout. Tributary drainages to Rendija trend eastward throughout area. PRS boundary shown on map too large to perform this type of an assessment on. 00-011(e) 10.5 6/25/1999 NO NO NO NO Mortar impact area north of Rendija Sportsman Club. Cliffs (300' to 400' high) +/- .5 mile north. YES NO Visible runoff throughout site. No applicable score for the site however. NO NO NO Veenis, Steve NO Site has dense poderosa canopy with gravel and dirt roads cross cutting throughout. Tributary drainages to Rendija trend eastward throughout area. PRS boundary shown on map too large to perform this type of an assessment on. 00-012 10.6 1/20/1999 YES NO NO NO Western Steam Plant located near DOE/LAO. PRS is an underground valve box and tank which has no outfall or other pathways to the environment. Flat area covered with asphalt south of building. Flat parking area south of building. NO NO Surface runoff would not be in contact with underground site. None due to underground location NO NO YES Sheet flow from surrounding area. Steve Veenis YES This site was re-evaluated since it was determined that the wrong site had been assessed. The original assessment was completed 8/5/97 and was performed at a site in Rendia Canyon. 00-015 39.5 8/5/1997 NO NO YES NO Bottom of Rendija Canyon (Sportsman's Club), site not located near watercourse. Flat areas heavily vegetated. Berms partially vegetated. Berms greater than 30%, remaining area <10% NO NO On berms in areas impacted by shooting and foot traffic. NO NO YES Sheet flow from surrounding area. T. Lemke NO Evidence of erosion along roads within site. No evidence of erosion or run-off leaving site. 00-016 39.8 10/21/1999 YES NO NO NO Guaje pines (00-016) is an inactive firing range located west of the Guaje Pines Cemetery in Rendija Canyon. It was used for small arms target practice from the late 1940s until the 1960s. The site, which occupies about 2 acres, consisted of several small buildings and two earthen ridges arranged in a semicircle to retain bullets. VCA completed in mid 1990's. Mostly base course. Back area completely revegetated. No canopy cover around base course, but trees scattered around (northern) back area. Site of remediation relatively flat. The back area slopes down to tributary drainage of Rendija Canyon. YES NO Back area sloped to the north has runoff evidence. Sheetflow from the remaining area is directed towards a small retention pond. Retention pond. Runoff from the (northern) back area drains to tributary of Rendija Canyon. None observed within PRS boundary. YES Parking area for heavy equipment. NO No operational impact. NO None. S. Veenis BMPs in place. Dirt berms, retention pond, reseeding/mulch, jutemat & straw bales used. 70% revegetative cover has been achieved. BMPs installed 9/30/93 NO Site re-evaluated to reflect current status of site. The original assessment was completed on 05/14/1997 (17.5 score) and did not include the northern back area. NMED was copied on original assessment 3/13/1998. 00-017 67.5 12/7/1998 YES NO NO YES A long section of waste line under parking lot north of LAMC main building. Waste line also proceeds south down into and across LA Canyon (Line 167). The LAMC portion is covered with asphalt (ongoing construction). The canyon crossing portion was removed and the area consists of volcanic tuff and loose rock on the steeper slopes and moderate vegetation at the canyon bottom. Flat lying area for near LAMC. Steeper cliffs on canyon sides. YES NO Runoff collects in area storm drains at LAMC, this portion is sub-surface and is not impacted by runoff. The canyon portion has evidence of normal runoff conditions along canyon slopes. Runoff terminates into LA Canyon on the Line 167 portion of the PRS. None observed. The terrain appears to be draining naturally with little or no sediment migration. YES Parking lot/building roof drains create run-on to area, although PRS is sub-surface. NO YES Natural run-on is occurring on both canyon slopes along PRS boundary. Veenis, Steve NO The PRS has two locations of concern. The LAMC and Line 167 portions. This assessment reflects the Line 167 portion which is considered to be "worst case". LAMC portion of site is currently disturbed due to temporary construction project. Site will be re-paved with asphalt when complete. The Line 167 portion has been removed and appears to have retained its natural condition and is stable. See assessments for 3-038 (a-b) for related areas. 00-018(a) 42.8 5/12/1997 NO YES NO NO Old wastewater treatment facility, within Pueblo Canyon. Total grass coverage in area of sludge fill. Natural vegetative canopy cover throughout the site. YES YES Tributary to Pueblo discharge to the east. NO NO YES S. Veenis BMPs required only if future cleanup occurs based on analytical data. NO 00-019 51.5 5/21/1997 YES YES NO NO Central wastewater treatment plant near Acid Canyon. Pine needles, grass, and rocks on ground. Ponderosa and scrub oak canopy. Flat area where former WWTP was located, slopes gently to steeper cliffs. YES NO Two discharge channels from former WWTP have been disconnected. Flow from site is sheet flow in nature. Sheet flow from flat area north of former WWTF. Sheet erosion off flat area near wastewater treatment facility. NO NO YES Natural run-on from area above site. S. Veenis Earthen/asphalt berm is located on the northern edge of the site to divert sheet flow runoff into the adjacent canyon NO 00-027 29.2 8/5/1997 YES NO NO NO Old fuel tank storage area at Knights of Columbus building. Area cemented over for parking lot. YES YES Depression for run-off from parking lot. 0-030(a) gets run-off from 0-027 parking lot drainage. YES Sloped roof of building creating run-on NO NO C. McLean Straw bales in drainage. BMPs installed 6/30/96 NO 00-030(g) 47.2 10/16/1998 YES YES NO NO Septic tank and outfall located near old Catholic Church on south side of Acid Canyon. Part of PRS under asphalt, the remainder is within drainage channel consisting of rocks, pine needles and some bare ground. Outfall from septic discharges over mesa's edge into steeper drainage channel below site. YES YES Outfall previously had discharged at mesa edge, evidence of discharge into natural drainage channel below site. Retention area near access road Runoff appears to terminate in depression area located south of access road. The road acts as a dam which prevents runoff from entering into canyon located approximately 50' north of road. Sediments within channel are being deposited in a variety of locations. Visible erosion is hard to see but can be inferred. NO NO YES Sheet flow from slope above site. Steve Veenis NO This site was re-evaluated to include the septic outfall and the associated discharges into the drainage below the site. The original assessment performed on 8/5/97, included only the septic tank. Since the access road terminates all local runoff, no additional BMPs are recommended. 00-030(i) 54.5 6/25/1999 NO YES NO NO Septic formerly located on bench with outfall on cliff edge. Mixed vegetation with some canopy coverage and oxposed tuff. Septic location mostly flat, outfall discharged over cliff face into canyon. YES YES Runoff from septic mostly sheetflow. Outfall discharged into channel at mesa edge. Outfall discharged directly into LA Canyon None observed, mostly onto exposed tuff. YES Run-on from Trinity Road commingles with outfall discharges. NO None YES Upslope run-on Veenis, Steve None at this time. Straw bales and erosion matting were in place during septic tank removal. Have mostly deteriorated and the site seems to be stable. NO Rebar used as stakes for straw bales are still in place and should be removed. 00-030(l) 29.2 12/3/1998 NA YES NO NO NO In open area on the north rim of LA canyon. Site has been remediated, final stabilization has been achieved. Site is planted and covered with natural grasses. Mesa top area. YES YES Man-made channel collects runoff from warehouse area and directs along southern edge of PRSs. Diversion channel Terminates by infiltration in ditch, the ditch terminates at north edge of LA canyon. None observed. NO NO YES Natural drainage on PRS, no other sources. Jeff Walterscheid NO 00-030(m) 29.2 12/3/1998 NA YES NO NO NO In open area on the north rim of LA canyon. Site has been remediated, final stabilization has been achieved. Site is planted and covered with natural grasses. Mesa top area. YES YES Man-made channel collects runoff from warehouse area and directs along southern edge of PRSs. Diversion channel Terminates by infiltration in ditch, the ditch terminates at north edge of LA canyon. None observed. NO NO YES Natural drainage on PRS, no other sources. Jeff Walterscheid NO 00-030(p) 3.6 6/25/1999 YES NO NO NO Former septic tank located in residential area off Rim Road. Thick, tall vegetation. Flat area next to mesa edge. NO NO Infiltrates. None observed. NO None NO None NO None. Veenis, Steve Existing geotextile in place with vegetation >70% after reseeding. Site close out iinspection performed earlier in FY99. NO 00-033(a) 3.6 12/3/1998 21-1002 YES NO NO NO PRS is located between warehouse buildings on 6th Street. Site has been remediated and final stabilization has been achieved. Areas is fully covered with grasses. Level area between buildings. NO NO NO NO NO Jeff Walterscheid NO No BMPs required, poly-jute and reseeding has been complete. C-00-041 42.8 5/14/1997 YES YES NO NO Located in townsite near Guaje Pines Cemetery. Natural vegetation has grown over remediated site. No canopy cover. Gradually sloped into Rendija Canyon, steeper towards canyon. YES YES Channel runs through site. Canyon to the north of site. Natural drainage channel exists, the remaining area has no visible erosion due to dense vegetation. NO NO YES Natural run-on from upslope areas occur. S. Veenis Visible tar within channel exists at some locations. The tar at these locations should be removed.
Tar was removed within the channel August 1998.Several straw bale check dams were installed in channel. Straw mulch was applied to all excavated areas. BMPs installed 5/31/95 NO Forest Service has agreed to final cleanup status of this site. A final walk through/pickup of visible tar should be performed.