472 



cated a total 12,700 spaces available and 270 lanes of launching also 

 existed. 



San Francisco Bay is a receptacle for waste from municipal (do- 

 mestic), industrial, and agricultural sources throughout its tributary 

 area. 



Three hundred ninety-eight million gallons of treated sewage and 

 industrial wastes are discharged daily during dry weather to the tidal 

 waters of the bay system from 77 municipal sewerage systems. Ap- 

 proximately 35 percent of these waste flows receive secondary treat- 

 ment at 23 sewage treatment plants with the remaining flow receiving 

 primary treatment at 54 sewage treatment plants. No community is 

 discharging waste without treatment in the San Francisco Bay region. 

 Forty-seven municipal waste discharges are now disinfecting or have 

 facilities capable of disinfecting their waste flow which amounts to 

 245 million gallons per day, while 32 dischargers with a total waste 

 flow of 153 million gallons per day do not have disinfection facilities. 



A total of 269 million gallons per day of industrial wastes is dis- 

 charged into the bay system by 47 industries. It is estimated that 

 approximately 94 percent of this waste flow is cooling water drawn 

 from the bay system and circulated in closed cooling systems. Most 

 of the industrial waste discharges are located along the shorelines of 

 Contra Costa County and discharge their wastes to San Pablo or 

 Suisun Bay. These discharges contribute more than 70 percent of 

 the biochemical oxygen demand loading in these areas; however, the 

 depletion of dissolved oxygen below 5 mg/1 has not been measured 

 immediately beyond industrial waste effluent dilution areas delineated 

 by the regional board. 



The number, location, and degree of treatment of both municipal 

 and industrial waste discharges changes with the continuing imple- 

 mentation of recommendations in studies of sewerage needs and of 

 master plans. 



Storm water runoff not containing sewage, discharged from storm 

 sewers, from flood control channels and from tributary streams is a 

 factor affecting water use. Also governing water usability are the 

 sediments from such activities as: agricultural practices, residential 

 development, highway construction, and mining of natural resourcees. 



The tributary streams and rivers also carry unknown quantities of 

 nutrients, pesticides, and organic and inorganic material drained from 

 residential, agricultural, and forested lands. The magnitude of the 

 present water quality problem created by these factors is unknown. 



Section 7. Major Problems and Dangers to the Bay 



Enjoyment of the bay is adversely affected by : 



(1) Land fill problems. Wildlife and shellfish resources are dam- 

 aged and sometimes lost when tidelands and marshes are filled. Eighty 

 percent of the marshland has been "reclaimed.'' About 20 percent of 

 the reclaimed areas are salt ponds and are currently used by wildlife. 

 Fifty percent of the remaining water area of the bay is vulnerable 

 to reclamation and fill. Current uncontrolled urban growth threatens 

 both tidelands and marshes. 



