AREA SETTING. Xxxxxxx Avenue is occupied by commercial businesses through the area and surrounding streets are primarily residential. The Site is located within a commercial and residential area. Sewer and stormwater systems serve the area. The probable point of entry (PPE) for site contaminants to Bear Creek is likely through stormwater discharge to surface water and a secondary discharge may be to Crooked Creek from surface water runoff. Surface water runoff likely enters the storm drain at several possible points on or adjacent to the property. From here, the pipe heads east until discharging into Bear Creek. The area has a temperate climate characterized by mild wet xxxxxxx and hot dry xxxxxxx. Topography, nearness to the Pacific Ocean, and exposure to middle-latitude westerly winds are the principal climatic controls. The normal annual precipitation in the Medford area is about 19.5 inches, the majority of which occurs as rain. The wettest months are November through March based on the National Weather Service Records, the average maximum temperature at the Medford station is 67.2 degrees Fahrenheit and the average minimum temperature is 41.3 degrees Fahrenheit. The Xxxxxx‟s Cleaners Site is not within the 100-year floodplain (18). The Xxxxxx‟s Cleaners Site is flat. Approximately 60 percent of the site is covered with asphalt and the remaining portions of the site are covered with either buildings or landscaping. The shopping center covers approximately 3.5 acres. There are several buildings, with multiple tenants (Xxxxxx‟s Cleaners, Coin-Op laundry, Xxxx Xxxxxx‟s Take-n-Bake, Bi-Mor Tobacco, a gas station) on site. There is no surface drainage from adjacent properties onto the site. Drainage at the site is diverted into the City stormwater system either directly or through street gutters (13). The nearest surface water feature is the Crooked Creek, approximately ¾ mile East of the Site. Crooked Creek flows into Bear Creek approximately one half mile NE of probable point of entry. The average annual flow rate for the Crooked Creek is not available. Flow rates for Bear Creek have been estimated from 1.8 cubic feet per second (cfs) to 217 cfs with a mean of 54 cfs (19). Bear Creek joins the Rogue River between Central Point and Gold Hill, the mean discharge on the Rogue River in this area is 2490 cfs.
AREA SETTING. The area has a temperate marine climate characterized by wet xxxxxxx and dry xxxxxxx. Topography, nearness to the Pacific Ocean, and exposure to middle-latitude westerly winds are the principal climatic controls. The normal annual precipitation in the Salem area is about 40.4 inches, most of which occurs as rain. The wettest months are December through February. According to the National Weather Service Records, the average maximum temperature at the Salem station is 63.5 degrees Fahrenheit and the average minimum temperature is 41.5 degrees Fahrenheit. The nearest surface water features are the Willamette River approximately 250 feet west of the most downgradient xxxxx sampled and ¼ mile West of Xxxxxxx Property and Xxxxxxxx Creek 1/2 mile to the east of the site. The Willamette River flows north approximately 80 miles to the Columbia River. The average annual flow rate for the Willamette River recorded at Salem, Oregon is about 23,930 cfs (Corps of Engineers, 2004). Xxxxxxxx Creek flows north approximately 3.5 miles to Clear Lake and during storm events, Clear Lake may drain to the Willamette River at its north end. Xxxxxxxx Creek is an urban stream that has been reduced to narrow ditch-like channels. According to City officials, surface water in the area is controlled by the city storm sewer system. The storm sewer system drains to the Willamette River, Xxxxxxxx Creek, or Labish Ditch. The overland surface drainage in the study area flows to the Willamette River on the west side of River Road, and flows to Xxxxxxxx Creek on the east side of River Road. Because most of the surface drainage in the study area would flow west towards the Willamette River, and shallow groundwater flows west-northwest towards the Willamette River, the downstream target distance limit (TDL) would extend 15 miles north of the site on the Willamette River, to just west of Woodburn. (See Figure 5) According to the City of Keizer there are local wetlands designated near the Willamette River and Xxxxxxxx Creek. The majority of the wetlands are located on Xxxxxxxx Creek. (See Appendix D for Wetlands Maps) According to the Federal Emergency Management Agency (FEMA) map, a portion of the Keizer area is in the 100 year floodplain and most of the study area is in the 500 year floodplain.
AREA SETTING. The climate is generally moderate, receiving approximately 13 inches to 20 inches of precipitation annually. The average temperature is 65.6
AREA SETTING. The area has a temperate marine climate characterized by wet xxxxxxx and dry xxxxxxx. Topography, nearness to the Pacific Ocean, and exposure to middle-latitude westerly winds are the principal climatic controls. The normal annual precipitation in the Corvallis area is about 38 inches, most of which occurs as rain. The wettest months are November through January. According to the National Weather Service Records, the average annual temperature at the Corvallis station is 53 degrees Fahrenheit. (Xxxxx, 1974) The nearest surface water features are the Mary’s River approximately 0.25 mile to the north, and the Willamette River approximately 0.75 mile to the northeast of the Site. The Mary’s River flows west of the Site approximately 1000 feet northward before turning east in Avery Park and eventually flowing into the Willamette River. The Willamette River flows north approximately hundred miles to the Columbia River. Due to part of the Site being located on a terrace approximately 226 feet above mean sea level (msl), surface water will most likely flow west or northwest towards the Mary’s River from the residential properties. Surface water from the WPRR railroad and Xxxxxx County Shops located approximately 222 feet above msl would flow east into storm water drains. The storm water drains into the drainage ditch called the Mill Race which flows into the into Mary’s River just above the confluence with the Willamette River. Because the Mary’s River flows into the Willamette River the downstream target distant limit (TDL) would be 15 miles north of the Site on the Willamette River. There was no evidence of overland flow from the Site to either of the rivers. There was no evidence of surface erosion at the residential properties, the WPRR railroad or the Xxxxxx County Shops. However, untreated storm water from the WRPP railroad and the Xxxxxx County Shops eventually drains into the Mary’s River. According to the Federal Emergency Management Agency (FEMA) map, the east portion of the site near 3rd Street is located within the100 year floodplain.
