Physical Setting. Xxxxxxx Field lies 35 miles south of San Francisco, 10 miles north of San Xxxx, and about 1mile south of San Francisco Bay. The facility encompasses about 2,000 acres in Santa Xxxxx County and borders the cities of Mountain View and Sunnyvale, California. To the north of Xxxxxxx Field are saltwater evaporation ponds and wetlands associated with San Francisco Bay; Stevens Creek lies to the west; U.S. Highway 101 runs along the southern perimeter; and Lockheed-Xxxxxx Aerospace facilities are located to the east. The Xxxx Campus is located in the northwest portion of Xxxxxxx Field. The area south of U.S. Highway 101 is industrial and includes a group of companies located or formerly located in a 0.5 square-mile area bounded by East Middlefield Road, Xxxxx Street, Xxxxxxx Road, and U.S. Highway 101, referred to as the MEW Superfund Site. These companies are implementing remedial activities for soil and groundwater contamination believed to originate within the MEW Superfund Site. Groundwater beneath the NRP parcels is impacted by migration of chemicals from the MEW Superfund Site and from past Navy operations at Xxxxxxx Field (Tetra Tech, 1998). The groundwater plumes underneath the NRP parcels are referred to as the West Side Aquifer or Regional Plume. Xxxxxxx Field was operated as a NAS by the U.S. Military beginning on its date of commission in April 1933. The base was designated for closure as an active military base under the U.S. Department of Defense Base Realignment and Closure (BRAC) program. The base was transferred in July 1994 to NASA, except for the military housing units and associated facilities, which were transferred to Onizuka Air Force Base. As described in the Xxxxxxx Field Comprehensive Use Plan, Environmental Assessment (Xxxxx & Associates, 1994), portions of Xxxxxxx Field will be converted from their former military use and redeveloped as a laboratory and associated offices. Other portions of the NRP Site are proposed for development as a collaborative research and educational campus, pursuant to the FEIS (DCE, 2002).
Physical Setting. Xxxxxxx Field lies 35 miles south of San Francisco, 10 miles north of San Xxxx, and about 1 mile south of San Francisco Bay (Plate 1). The facility encompasses about 2,000 acres in Santa Xxxxx County and borders the cities of Mountain View and Sunnyvale, California. To the north of Xxxxxxx Field are saltwater evaporation ponds and wetlands associated with San Francisco Bay; Stevens Creek lies to the west; U.S. Highway 101 runs along the southern perimeter; and Lockheed-Xxxxxx Aerospace facilities are located to the east. NASA Xxxx Research Center is in the northwest portion of Xxxxxxx Field. The area south of U.S. 101 is and has been industrial and includes a group of companies located or formerly located in a 0.5 square-mile area bounded by East Middlefield Road, Xxxxx Street, Xxxxxxx Road, and U.S. 101 referred to as the MEW Superfund Site. These companies are cleaning up soil and groundwater contamination believed to originate within the MEW Superfund site that has also affected groundwater quality beneath the NRP (Tetra Tech, 1998c). The NASA Research Park Parcels (Plate 2) are in the southern portion of Xxxxxxx Field and comprise 213 acres. The NASA Xxxx Research Center lies to the north and west of the NRP, U.S. 101 bounds the NRP to the south, and the runways and hangars of Xxxxxxx Federal Airfield lie to the east.
Physical Setting. Because the site is mostly paved or covered with buildings and contamination is not at the surface, the only likely air migration pathway would be volatilization from contaminated soil and groundwater. Several chemicals were detected in the soil gas samples. These include cis-1, 2-DCE, TCE, PCE, vinyl chloride, several petroleum compounds, and the leak check gas 2-propanol. PCE in one sub-slab soil gas sample exceeds the DEQ RBC for vapor intrusion to an occupational structure. However, it is in an area that currently receives limited use.
Physical Setting. The Tule Subbasin is located in the southern portion of the San Xxxxxxx Valley Groundwater Basin in the Central Valley of California. The lateral boundaries of the Tule Subbasin include both natural and political boundaries. The eastern boundary of the Tule Subbasin is defined by the surface contact between crystalline rocks of the Sierra Nevada and surficial alluvial sediments that make up the groundwater basin. The northern boundary is defined by the Lower Tule River Irrigation District (LTRID) and Porterville Irrigation District boundaries. The western boundary is defined by the Tulare County/Kings County boundary, except for a portion of the Tulare Lake Basin Water Storage District that extends east across the county boundary and is excluded from the subbasin. The southern boundary is defined by the Tulare County/Xxxx County boundary except for the portion of the Delano-Earlimart Irrigation District (DEID) that extends south of the county boundary and is included in the subbasin. The area of the Tule Subbasin is defined by the latest version of DWR Bulletin 118 and is approximately 744 square miles (475,895 acres). The subbasin has been divided into seven individual GSAs: ETGSA, LTGSA, PIXID GSA, DEID GSA, Alpaugh GSA, TCWA GSA, and the Tulare County GSA. Communities within the subbasin include Allensworth, Alpaugh, Porterville, Tipton, Pixley, Earlimart, Richgrove, Ducor and Terra Bella. Neighboring DWR Bulletin 118 subbasins include the Xxxx County Subbasin to the south, the Tulare Lake Subbasin to the west, and the Kaweah Subbasin to the north.
Physical Setting. The physical setting of the Project Study Area is described below in terms of the climate, hydrology and topography present in the project area and vicinity, the soils found in the project footprint, and the vegetation communities that characterize the Project Study Area.
Physical Setting. The SGV study area is located approximately 25 miles from the Pacific Coast in eastern Los Angeles County. The SGV has been the subject of environmental investigation since 1979 , when groundwater contaminated with volatile organic compounds (VOCs) was first identified. In May 1 984, four areas of contamination within the basin were listed as San Xxxxxxx Areas 1 through 4 on USEPA’s National Priorities List (NPL) . USEPA subsequently divided the basin into seven hydrogeolog ic units to assist in identification of contaminant distrib ution and the planning of future remedial activities. The following sections present a summary of the basin ’s background, location, physiography , and geology. Figure 2-4 presents a map of the SGV study area with groundwater production and monitoring xxxxx. The SGV study area encompasses approximately 170 square mile s and includes multiple areas of contaminated groundwater. The contaminated areas underlie significant portions of the cities of Alhambra, Arcadia, Azusa, Xxxxxxx Park, Industry, Irwindale, El Mo nte, La Xxxxxx, Monrovia, Rosemead, South El Monte, and West Covina. The groundwater contamination was first detected in 1979. Following this discovery, the California Department of Public Health (CDPH) initiated a well sampling program to assess the exten t of contamination. By 1984, when USEPA added four areas of contamination to the NPL, 59 xxxxx were known to be contaminated with VOCs. Four areas of groundwater contamination have been listed in the NPL : San Xxxxxxx Valley Area 1, San Xxxxxxx Valley Area 2, San Xxxxxxx Valley Area 3, and San Xxxxxxx Valley Area 4 . Each of the individual areas are divided into Operable Units : Area 1 includes the El Monte, Richwood, South El Monte, Suburban Water Systems, and Whittier Narrows Operable Units. Area 2 includes the Xxxxxxx Park Operable Unit. Area 3 includes the A lhambra Operable Unit. Area 4 includes the Xxxxxx Valley Operable Unit .
Physical Setting. The SFV study area is located in Los Angeles County, California and includes the following Areas: Area 1, North Hollywood and Burbank; Area 2, Crystal Springs ; Area 3, V erdugo; and Area 4, Xxxxxxx. The study area consists of mixed land use, including residential, commercial, industrial , and recreational uses. The majority of the area underlain by contaminated groundwater in the SFV study area is in the industrial corridor that generally follows the Golden State Freeway (I -5) and the railroad right s of way. The population within the SFV study area, based on 2003 census data, is estimated to be approximately 1 .1 million .
Physical Setting. 5 13. The Santa Xxxxx River Valley - Oxnard Basin, defined by the California 6 Department of Water Resources’ Bulletin 118 as Basin No. 4-004.02, encompasses an area of 7 approximately 58,000 acres. The Basin is located entirely within Ventura County. The eastern 8 boundary is the Las Xxxxx Valley Basin and Pleasant Valley Basin. The northern boundary is the 0 Xxx Xxxxx Fault, and the southern boundary is the Santa Xxxxxx Mountains. The western 10 boundary is the Pacific Ocean.
Physical Setting a. The Noise All Around The noise from outside could make them lose concentration. Because their class was next to other classes, sometimes if the other class students did not have a lecturer teaching, they would leave the class together and joked together, their voices were sometimes very distracting while listening to the conversation from the audio.
Physical Setting
