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Santa Margarita River Wma Monitoring Station Descriptions

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Santa Margarita River Wma Monitoring Station Descriptions APPENDIX C Santa Margarita River WMA TMAR – FINAL January 2019 APPENDIX C – SANTA MARGARITA RIVER WMA MONITORING STATION DESCRIPTIONS Santa Margarita River WMA Transitional January 2019 Monitoring and Assessment Report - Final APPENDIX C Station Name: Temecula Creek below Pala Road (Lower Temecula Creek) Hydstra1 Reference #: 902LTC777 Location: Latitude 33° 28 '28.14" N Longitude 117° 8' 19.84" W Elevation 1,008 feet Thomas Bros Pg 979B3 Classification: Receiving Water - Mass Loading Station & Stream Assessment Type of Channel: Natural River Receiving Water: Santa Margarita River Directions to the site: Drive south on the I-215 freeway and exit at SR 79 South/Old Town Front Street. Go west of the freeway and turn left at the first stoplight. Turn left about 100 feet past the stop light onto a gravel/dirt road. Turn right, before the yellow EMWD gate. Drive to the dirt road that goes left and up. Go about 100 feet and turn right onto the dirt road. Go about 1,700 feet and drive to where the dirt road meets up with the gravel road. Follow the gravel road to the L3437 Pala II Pump Station. Park just past the pump station. Walk to the east and sample water from the stream flow just under the bridge. Temecula Creek at Pala Road is a Receiving Water Station. The Temecula Creek site, at an elevation of 968 feet, is located just east of the I-15 Freeway overpass, upstream of its confluence with Murrieta Creek. Creek flows are subsurface approximately 200 yards upstream (east) of the I-15 Freeway. The site seasonally varies from sparse to heavy in-stream vegetation. Aquatic habitat is not found in this reach. Conditions for benthic invertebrates tend to be poor at best. Primary source of flow at this sampling location during Dry weather is rising groundwater surfacing approximately 400 yards upstream. Since 2011-2012, Dry weather monitoring activities has shown that there is little to no evidence of any MS4 contribution to flow at this station; Temecula Creek is ephemeral beyond this spot. Vail Lake lies approximately 18 miles upstream of the Pala Road Crossing and traps virtually all of the Temecula Creek storm flows; discharges from Vail Lake flow into infiltration basins above Butterfield Stage Road. The soil profile in this 18-mile reach of Temecula Creek consists of deep alluvium with a high infiltration rate. 1 Hydstra is a proprietary data management system, the program supports export of data in commonly used spreadsheet and database formats. The use of trademark or brand names does not connote a recommendation of a particular product. * Source for Riverside County Receiving Water Site Descriptions: Attachment D, 2015-16 Monitoring Annual Report (Riverside County Copermittees, 2016) C-1 Santa Margarita River WMA Transitional January 2019 Monitoring and Assessment Report - Final APPENDIX C Non-significant storm flows infiltrate prior to reaching the Santa Margarita River. Less than 5% of the watershed tributary to this station is zoned for urban land uses and within the Permittee's jurisdiction. MS4 facility discharges to Temecula Creek flow into a 100-foot-wide vegetated strip that is approximately 13,000 feet long and starts approximately 3½ miles upstream of this sampling location. This site was also used as a probabilistic site in the SMC Dry Weather Regional Monitoring Program for the 2009 Index Sampling Period. The total drainage area tributary to the Temecula Creek stations is 232,404 acres, of which 175,671 acres are within Riverside County. This tributary map includes the drainage area above Vail Lake, which is actually a controlled input to the tributary that releases flows infrequently. Temecula Creek (902LTC777) Land Use (%) Land Use 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 Urban Residential 1.64 1.64 1.57 1.54 1.53 1.54 1.54 1.54 1.54 1.54 Industrial 0.04 0.03 0.03 0.03 .03 0.03 0.03 0.03 0.03 0.03 Commercial 0.34 0.33 0.31 0.32 .47 0.47 0.45 1.55 1.55 1.55 Streets 2.60 2.60 2.38 2.37 2.37 2.37 2.39 2.49 2.49 2.49 Total Urban 4.62 4.60 4.30 4.26 Rural Residential 25.58 26.01 26.12 27.4 30.87 31.00 31.11 29.70 29.70 29.70 Agriculture 5.35 5.08 4.90 4.88 5.05 5.20 5.10 8.28 8.28 8.28 Preserves & Open Space 12.02 12.32 13.24 12.23 13.31 13.45 13.68 16.25 16.25 16.25 Parks & Recreation 1.13 1.13 0.78 0.76 .75 0.96 0.75 1.15 1.15 1.15 Exempt Public Properties 51.30 50.84 50.66 50.46 45.60 44.99 44.95 39.01 39.01 39.01 Total Non-Urban 95.56 95.40 95.70 95.73 Note: GIS information has improved considerably and percentages have become more accurate since 2004. * Source for Riverside County Receiving Water Site Descriptions: Attachment D, 2015-16 Monitoring Annual Report (Riverside County Copermittees, 2016) C-2 Santa Margarita River WMA Transitional January 2019 Monitoring and Assessment Report - Final APPENDIX C Station Name: Murrieta Creek at Temecula (Lower Murrieta Creek) Hydstra Reference #: 902LMC778 Location: Latitude 33°28'40.88 N Longitude 117°8'32.35" W Elevation 1,030 feet Thomas Bros Pg 978J2 Classification: Receiving Water - Mass Loading Station & Stream Assessment Type of Channel: Natural River Receiving Water: Santa Margarita River Directions to the site: Exit Rancho California Road from Interstate 15. Drive west of the freeway and turn left to Front Street. Turn right to Main Street. Turn left to Pujol Street. When Pujol Street goes from asphalt to a dirt road, drive about 500 feet and turn left at the two yellow vertical bollards. CAUTION: A 4-Wheel drive vehicle is recommended when driving in this area. Drive straight toward the creek. The picture shows the sampling location which is approximately 1100 feet downstream of the Rancho California Water District blow-off and approximately 600 feet downstream of the USGS gauge house. Note: During Storm Events, sampling is conducted at the USGS gauge house, upstream of the USGS weir due to safety. Lower Murrieta Creek at is a Receiving Water Station. The station is located just above the confluence of Murrieta Creek with Temecula Creek, at an elevation of 987 feet, downstream of the USGS gauging station in southern Temecula, CA, where Highway 79 crosses the I-15. The station is located in a section of bedrock just downstream (within ½ mile) from a portion of the Creek that was graded and re-vegetated in 2004 as a result of an Army Corps of Engineers project. A tributary to the Santa Margarita River, flows during Dry Weather at this station consists of rising groundwater that begins approximately ½- to ¼- mile from Murrieta Creek's confluence with the Santa Margarita River. This monitoring station is 0.4 miles upstream of the confluence of Temecula Creek and Murrieta Creek. The soil profile here indicates bedrock at the surface. The flow seen in the photo above is supplied by the mandated Rancho California Water District blow off just 100 yards upstream of the gauge and sampling point. * Source for Riverside County Receiving Water Site Descriptions: Attachment D, 2015-16 Monitoring Annual Report (Riverside County Copermittees, 2016) C-3 Santa Margarita River WMA Transitional January 2019 Monitoring and Assessment Report - Final APPENDIX C The total drainage area tributary to the Murrieta Creek station is 141,912 acres, all of which resides within Riverside County. This tributary map includes the drainage area above Lake Skinner, which is actually a controlled input to the tributary that releases flows infrequently. Murrieta Creek (902LMC778) Land Use (%) Land Use 2018 2017 2016 2015 2014 2013* 2012 2011 2010 2009 Urban Residential 8.87 8.74 8.37 8.28 8.12 8.12 11.64 11.58 11.58 11.58 Industrial 0.84 0.81 0.71 0.71 .70 0.71 1.00 0.96 0.96 0.96 Commercial 1.90 1.85 1.75 1.66 1.66 1.66 2.32 5.21 5.21 5.21 Streets 8.04 7.98 7.13 7.09 7.07 7.02 9.18 9.28 9.28 9.28 Total Urban 19.65 19.38 17.96 17.74 Rural Residential 29.09 29.47 30.24 30.48 30.97 31.44 28.18 29.52 29.52 29.52 Agriculture 5.89 5.69 5.71 5.84 5.37 6.09 6.80 12.49 12.49 12.49 Preserves & Open Space 14.11 14.37 15.32 15.3 15.66 16.42 19.45 15.03 15.03 15.03 Parks & Recreation 1.13 1.09 0.61 0.62 .61 0.62 0.84 2.54 2.54 2.54 Exempt Public Properties 30.14 30.00 30.16 30.03 29.94 27.91 20.59 13.40 13.40 13.40 Total Non-Urban 80.36 80.62 82.04 82.27 * Land use area represents portion of watershed below Lake Skinner. 2006 – Includes Lake Skinner drainage area. 2005 – Urban influenced area only. 2013 – Includes Lake Skinner drainage area. Note: GIS information has improved considerably and percentages have become more accurate since 2004. * Source for Riverside County Receiving Water Site Descriptions: Attachment D, 2015-16 Monitoring Annual Report (Riverside County Copermittees, 2016) C-4 Santa Margarita River WMA Transitional January 2019 Monitoring and Assessment Report - Final APPENDIX C Station Name: Adobe Creek Hydstra Reference #: 902ADB848 Location: Latitude 33°30'48.10" N Longitude 117°16'04.40" W Elevation 1,749 feet Thomas Bros Pg: 957 D5 Classification: Receiving Water Reference (Wet & Dry) Type of Channel: Natural Stream Receiving water: Sandia Canyon to Santa Margarita River NOTE: Due to an ownership change from the Conservancy to the State Department of Fish and Game, a Research Use Permit is required for sampling and monitoring.
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