SR 06:208 - Laserfiche WebLink

Although the City and Zone Ts water arc both in compliance with all water-quality standards. some people consider the local groundwater to have lower quality water than surface-water resources. 'I11is is because local groundwater contains total dissolved solids averaging from 400 to 550 milligrams per liter (mg/l) and has higher amounts of naturally occutring minerals such as calcium and magnesium than water from other sources. Although these minerals arc harmless at the levels present in the groundwater after the winter tTIonths the sununcrtimc well water sOlnctilncs has a noticeable change in taste odor. and/or washing characteristics. See Water Supply in the Public Facilities Element for additional discussion of water odor. taste. and hardness. Within the Planning Area the Rep10nal Water Quality Control Board has characterized the Arroyo de la Laguna. Arroyo de Las Positas. Arroyo del Valle Arroyo Mocho. and Alameda Creek as impaired by diazinon. n Diazinon is a pesticide used on a variet:y of agricultural crops and formerly used on residential !iflrdens and lawns. As of December 31. 2004 the EP A no longer permits its sale for non- agricultural uses. Diazinon is hi!'hly toxic to birds mammal. honeybees and other beneficial insects. freshwater fish and invertebrates. It affects plasma. red blood cells and brains in humans. especially children. In addition diazinon is one of the top causes of bird-kill incidents. 14 Diazinon is a non-point pollutant within the Planninv l\rea. Continued monitorinv for diazinon and other pollutants of concern should be performed to help define the non-source pollutant problems within the Planning Area. Water <juality protection from diazinon can be achieved through source control and through increasing public education and the awareness of avricultural users. Imoved here] ~vahoe-efflueflt currently i" rnonitBtetl b) 'I1,e Dublin San Ramon Services District currently monitors sewage effluent. "lbe DSRSD treatment plant produces .:;econdary effluent which is pumped to San Francisco Bay. tertiary effluent which is used primarily for landscape watering in commercial areas and sludge which is decomposed and then buried nearbyon "ite and tl.en l.outed to the '/a"w Road landfill .lite ("ee Puhlie Faeilitie.l Elen.ent). 'I1,e District D~~llSD monitors secondary effluent on a daily basis and monitors the sewage transport system for pH levels (a measure of acidity or alkalinit)') and hydrogen sulfide. j\t its sewage ponds site the District operates numerous test wells at their je.. age pond.! .lite .. hieh that have shown no toxic material intrusion on the soil content. A t1i.,el13'ioA of ..ater "'1'1'1) aAd related polieie" antll'rogramj i.l eontainetlSee Wastewater in the Public Facilities Element for additional discussion of wastewater treatment. Stormwater Runoff Historically the City has focused stormwater runoff management efforts on reducing downstream flooding risks by providing storm-drain systems in developed areas. However storlJ1water runoff also 13 Impaired surface waters arc those which arc known to not meet applicable Ckan If/aler Ad water quality st;Hldards or which require implementation of control programs to maintain compliance with applicable water quality standards. 14 US Environmental Protection l\gcncy. hup:/ /www.epa.gov/pcstlcides/op/diazinon/summacy.htm. "Pesticides: Organophosphates," March 20. 2006. Con os I'.ILTllCllI,CCOH2<)116,rclninc VII-l1