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l Pesticide Rinse Water Disposal Sites -7- RECOMMENDATIONS The following recommendations are made to ensure that current pesticide rinse water disposal complies with current regulations and that the potential for old rinse water disposal sites to impact water quality is evaluated. 2. Pesticide applicators should: A. Minimize the production of rinse water by using dedicated equipment for compatible materials, -field rinsing tanks, using high-pressure/low- volume spray washers, etc. B. Wash on a well-constructed concrete pad that discharges to a storage unit which meets the regulations administered by DHS and the appro- priate Regional Water Quality Control Board: (RWQCB). It is expected that most operators will utilize an above-ground storage tank located on a bermed and paved area. Prior to construction of any wash facil- ity, plans should be reviewed by DNS and RWQCB staff. C. Plan to reuse the collected rinse water and/or treat it by filtration, biological degradation, evaporation, etc. Hauling to a Class I facility may provide a short-term alternative. D. Review past disposal practices to identify areas that could have significant pesticide residues. Consult with applicator organizations such as the Western Agricultural Chemical Association (WACA) and the California Agricultural Aircraft Association (CAAA) , with other applicators, and with waste management consultants to select pro- cedures to evaluate the pesticide residue levels in the disposal areas. For pesticide residues that pose an environmental threat, determine the areal and vertical extent of the residues and select mitigation measures. 2. Regional Board staff should: A. At sites where pesticides have been detected in ground water, require the operators and/or owners to fully characterize the distribution of pesticide residues and propose mitigation measures for polluted waters. B. Promptly review any proposed rinse water management facilities and coordinate with DHS staff to get the facilities operational as soon as possible. C. Require all rinse water generators to test their rinse water to deter- mine if it is hazardous or designated waste or to manage the rinse water as if it is a hazardous waste. Subsequently, staff should review rinse water management procedures at applicator facilities to determine compliance with waste classification and management regulations.