The North San Francisco Bay Study Unit was sampled between 8/31/2004 and 11/18/2004; 79 wells were sampled.
The study unit consists of 3 study areas:
• Volcanic Highlands • Valley and Plains (Alexander Valley, Kenwood Valley, Lower Russian River Valley, Napa/Sonoma Valley, Petaluma Valley, Santa Rosa Valley) • Wilson Grove Formation Highlands
The study unit is within the Sonoma, Napa, Marin, Lake and Solano counties.
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