Installation of multiple-depth monitoring wells in Couny 2008–PLATE 1 U.S. DEPARTMENT OF THE INTERIOR PREPARED IN COOPERATION WITH Danskin, W.R., 2008 U.S. GEOLOGICAL SURVEY SWEETWATER AUTHORITY, OTAY WATER DISTRICT, AND CITY OF SAN DIEGO Basin Study, 2008

117 30’ 117 15’ 117 00’ 116 45’ 116 30’ 116 15’ 116 00’ 33 15’ Oceanside Vista

Carlsbad San Marcos EscondidoCreek

Creek Lake Ysabel Sutherland

Santa Escondido Basin Encinitas Lake Hodges

33 00’ Solana Beach San Diego River Basin Lake Cuyamaca Del Mar

Laguna Mountains Penasquitos watershed Miramar San Vicente La Jolla Reservoir Reservoir Canyon

El Capitan Santee Reservoir San Diego County

Area of Plate 3 (scale: 1:48,000) Imperial County r River El Cajon Sweetwater River Basin

Diego Loveland San Reservoir 32 River 45’ Pueblo watershed San Diego Sweetwater Pacific Reservoir Point Loma Barrett Wastewater Otay River Basin Lake Treatment Plant National City Lake Point Loma Morena ocean outfall Sweetwater Chula Vista Creek Baja California United States Otay River Mexico Ocean Cottonwood South Bay Wastewater

18,970 ft Treatment Plant South Bay 4,670 ft ocean outfall

32 30’ Area of Plate 2 (scale: 1:100,000)

Islas Presa Aberardo L. De Los Rodriguez Coronados Basin

Rosarito

32 15’

Shaded relief base from U.S. Geological Survey 117 15’ 117 00’ 116 45’ 116 30’ 116 15’ 116 00’ digital elevation data, 1:24,000-scale 0 10 20 MILES

01020 KILOMETERS

Scale: 1: 300,000

CALIFORNIA U.S.A. Coastal Basins of San Diego County, California, and Study area Northern Baja California, Mexico

San Dieguito River Basin San Diego River Basin Sweetwater River Basin Otay River Basin

Sweetwater Otay Mtn River Basin San Diego River Basin San Miguel Mtn

Recent Drilling Site San Diego Otay River MEXICO

Sweetwater Reservoir UNITED STATES (SDOR) 2008 Drilling Site Balboa Park (SDBP) ETPK Los Penasquitos SDAQ SDMC Creek Basin SDAQ

Pueblo Tijuana Drainage Basin River Basin SDBP SDNB

SDMC TJV1 SDOT TJV3

TJV2

Local features in River basins in study area, Coastal San Diego County, California

Location of multiple-depth monitoring well

Geohydrology of Coastal San Diego County, California Preliminary By Wesley R. Danskin Subject to Revision 2009