California Department of Pesticide Regulation News Release November 25, 1998 (98-35) (News editors: Note time element in second paragraph.) DPR Schedules Workshops for Ground Water Protection SACRAMENTO -- Cal/EPA's Department of Pesticide Regulation will hold two public workshops in December to discuss proposed changes in DPR's ground water protection program. The first workshop will be held from 9 a.m. to noon on December 15 at the Fresno County Agricultural Commissioner's Office conference room, 1730 S. Maple Avenue, Fresno. The second workshop will be held from 9 a.m. to noon on December 17 at the Yolo County Agricultural Commissioner's Office (Norton Hall), 70 Cottonwood Street, Woodland. *These workshops will introduce proposals to improve and enhance our ability to prevent ground water contamination from pesticides,* said DPR Director James W. Wells. *In the past decade, we have collected an enormous amount of data on ground water. With this data, we are better able to predict how climate, soil type, and a pesticide's chemical and physical properties contribute to ground water contamination. All this lays the scientific foundation for new regulations.* Wells said that DPR's approach will enhance protection of ground water. *We will use new methods developed in recent years by DPR scientists to identify potentially vulnerable areas before contamination occurs,* he said. *Pesticide management practices can then be tailored for the situations in which pesticides could move into ground water. The primary focus will be on protecting vulnerable areas, and will include statewide educational efforts and regulatory strategies to implement management practices that prevent contamination before it occurs.* *This pro-active approach can also benefit pesticide users who share our concerns about protecting people and the environment,* said Wells. A key component of DPR's ground water program is the Pesticide Contamination Prevention Act of 1985. That legislation created procedures for identifying and tracking ground water contamination. Under the law, DPR collected data on how agricultural pesticides behave in soil, established a statewide data base of wells sampled for pesticides, and published annual reports on detections. More than 20,000 wells have been sampled in the past decade. DPR has used data from the sampling to identify contaminated areas and designate them as Pesticide Management Zones (PMZs). While specific chemicals detected within PMZs are regulated under the current program, it does not address potential pesticide movement into ground water outside the PMZs. The 1985 law emphasized identification of pesticides with characteristics that made them a likely threat to ground water. However, in the past decade, DPR scientists have found it equally important to identify the areas vulnerable to ground water contamination. DPR data suggests that soil and climatic conditions often play a critical role in ground water contamination. Using this data, DPR scientists have constructed a computer model that identifies areas vulnerable to ground water contamination. The model could also help agricultural pesticide users improve their applications. For example, studies in the San Joaquin Valley found a particular herbicide was more likely to move through coarse soils and into ground water when the field was over-irrigated. Good irrigation management prevented ground water contamination, reduced pesticide use, and maintained satisfactory weed control. Defining vulnerable areas with computer modeling is one discussion item for the workshops. Other items include refining restrictions for chemicals used in vulnerable areas and reviewing restrictions to protect wells. *Input from these public workshops will be used to fine-tune our proposals and ensure that they meet our goals and are workable in the field,* said Wells. *We want to help farmers and others develop practices that work from both an environmental and economic standpoint.* For more information on the workshops to be held by DPR's Environmental Monitoring Branch, call John Troiano at (916) 324-4115 or Joe Marade at (916) 324-4119. Media Contacts: Veda Federighi, 916/445-3974 Glenn Brank, 916/445-3970
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