Bacteriological Monitoring Studies to Identify Sources of Fecal Pollution at Baby Beach, Dana Point Harbor, California

摘要

Baby Beach, at Dana Point Harbor, CA has had a history of impaired water quality resulting in frequent beach postings and closures due to high fecal indicator bacteria concentrations, especially Enterococcus spp. Numerous Best Management Practices (BMPs) to reduce bacterial levels have been implemented, yet the postings continue. Weekly bacteriological monitoring data indicate a general decline in concentrations of fecal and total coliform bacteria from 1999-2002, suggesting some benefit of current BMPs such as storm drain plugs and netting to discourage bird nesting. However, enterococci concentrations increased during the same period. Bacterial monitoring studies to identify potential sources of indicator bacteria such as storm drains, birds, and sediments were conducted. The study objective was to assess groundwater, storm drains, seagulls, sediments, and increased boating and beach bathing activities as sources of fecal indicator bacteria.