Name: Groundwater Recharge Areas

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Description: Hydrogeologically Vulnerable Areas Map: Background: In response to Executive Order D-5-99, State Water Board staff created a map wherepublished hydrogeologic information indicates soil or rock conditions that may be morevulnerable (or susceptible) to groundwater contamination: ”HydrogeologicallyVulnerable Areas.” The map was created due to groundwater concerns over releases ofMTBE, primarily from leaking underground storage tank sites. However, areas that arevulnerable to MTBE may also be vulnerable to other contaminants released at thesurface.The map was created in 2000 using Department of Water Resources (DWR) and USGeological Survey publications. Data from these publications were used to identifyareas where geologic conditions are more likely to allow recharge at rates substantiallyhigher than in lower permeability or confined areas of the same groundwater basin.The identified areas are associated by a metadata table (in the following pages) whichidentifies (1) DWR basin name and number, (2) published source of information (i.e.,title, date, author, and appropriate page, figure, table, or plate number), and (3) specificcriteria upon which the vulnerability category is based.Groundwater resources underlying designated (i.e., published) recharge, rapidinfiltration, or unconfined areas were considered categorically more vulnerable topotential contaminant releases than groundwater underlying areas of slower recharge,lower infiltration rates, or intervening low permeability deposits (i.e., confining layers).

Copyright Text: CA State water board

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