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The sediment in San Francisco Bay, once thought of as a renewable resource, is eroding and being removed much more quickly than nature replenishes it — which could affect two companies’ requests to increase their sand-mining operations.
Sand has been removed from the Bay for more than 100 years, first for harbors and channels and later for use in construction. For decades it was assumed the sediment was quickly replenished. But new research shows that only 15 percent of the coarse sand mined for construction purposes is replenished…