SR 06:209 - Laserfiche WebLink

In March 2006, Zone 7 published the Draft Stream Management Master Plan (SMMP). This plan balances flood protection with water supply, water quality, habitat and environment, and recreation and trails objectives for the Tri Valley. Dam Failure Inundation As shown in Figure V -8, about 6,000 acres in Pleasanton are located within the dam failure inundation hazard area for Lake Del Valle Dam.8 The 235-foot Del Valle Dam impounds a reservoir with a total capacity of 77,100 acre-feet. To provide a flood-control reserve, it normally stores from 25,000 to 40,000 acre-feet. (An acre-foot is 325,900 gallons, enough water to cover one acre of land one foot deep.) This dam is under the jurisdiction of the California Department of Water Resources (DWR), Division of the Safety of Dams. Existing dams under DWR jurisdiction are periodically inspected to ensure adequate maintenance and to direct the owner to correct any deficiencies found. In 2002, the City adopted an evacuation plan as an annex to its Comprehensive Emet;gency Management Plan. HAZARDOUS MATERIALS Products as diverse as gasoline, paint, solvents, film-processing chemicals, household cleaning products, refrigerants, and radioactive substances are categorized as hazardous materials. What remains of a hazardous material after use, or processing, is considered to be a hazardous waste. The handling, storage, transportation, and disposal of such wastes are of concern to all communities. Improper handling of hazardous materials or wastes may result in significant effects to human health and the environment. Nearly all businesses and residences in Pleasanton generate some amount of hazardous wastes. The most common industrial hazardous wastes in Pleasanton are generated from gasoline service stations, dry cleaners, automotive mechanics, auto body repair shops, machine shops, printers, and photo processors. Most of these wastes are petroleum-based or hydrocarbon hazardous waste and include cleaning and paint solvents, lubricants, and oils. However, medical wastes, defined as potentially infectious waste from sources such as laboratories, clinics and hospitals, are also included among the hazardous wastes found in Pleasanton. In addition to the hazards of stored chemicals, there are hazards of transporting chemicals into and through the area. Most hazardous materials are regularly carried on railroads and the freeways and major roads designated as explosive routes by CALTRANS and the Highway Patrol. Petroleum product and natural gas pipelines also traverse the Planning Area. (See Figure V-9 for the location of these pipelines as well as PG&E transmission lines.) The extreme toxicity of some chemicals used in the area and the specialized handling and cleanup procedures required during an accident can close major thoroughfares and necessitate evacuation. 8 Since the Ciry calculated the acres of llooding due to potential failure of J.ake Dd Valle Dam, Zone 7 \Vater Agency has instituted numerous measures that would reduce flooding, a1lh<mgh thereduccdlloodinghazardhaslIot}'Ctbcenquantified. Public Safety 082906. dean V-21 City Council 8/29/2006