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A-C1 APPENDIX C FACILITIES INVESTIGATED 1. This is a MAD facility that utilizes a covered wash pad with a three chamber concrete sump. The exterior of ground application equipment is washed using a degreaser and a detergent. Sediment collects in the first chamber in the sump. Liquid flows to the second chamber, then to the third from where it is discharged to a city sewer. Sediment is removed twice a year from the sump and applied over non-crop land at the facility. Three OP pesticides are applied by the district: malathion, fenthion (Baytex) , and chlorpyrifos (Dursban) . In addition, Pyrethrins, Bacillus thuringiensis (biological larvicide) , glyphosphate (Roundup and Rodeo) , and petroleum distillates ("weed oil" and carriers) are used by the district. Analyses were restricted to OP pesticides and were conducted on a sample of the sediment from the sump and four liquid samples from the sump collected after washing of different vehicles over a 10-day period. Review of the analytical results indicates that some pesticides are being introduced into the city sewer collection system and that the discharger will need to inform the city or cease the discharge. In addition, pesticide levels in the sediment indicate that it has the ability to impact water quality if not properly managed (i .e. , could be a 'designated waste' ) . The district will need to submit a waste management plan if discharge of this waste will continue on-site. The source of the diazinon detected during the analyses Is unknown; it has been postulated that the pesticide may have been introduced from mud adhering to equipment tires that passed through agricultural land treated with the pesticide. 2. This MAD facility has a covered wash pad and utilized a leachline for exterior rinse water disposal until early 1985. At that time, the leach- line was opened for sampling access, and wash water generation was mini- mized. This district was using only chlorpyrifos and weed oil at the time of the investigation; malathion and fenthion had been used in the past. A water sample was collected at the exposed end of the leachline and a soil sample was collected under the exposed end. Analyses revealed low levels of three OP pesticides , and the district manager indicated that he was planning to construct above-ground rinse water storage tanks to replace the leachline. Collected rinsewater would be reused for dilution of subsequent batches of pesticide. When the leachline is removed, additional testing will be necessary to further evaluate the effects of past rinse water disposal at the site. 3. This is another MAD facility with a covered wash pad exterior. Rinse water gravity flows into a surface impounclrent from where it evaporates. A water sample and a soil sample were collected from the impoundment. Analyses revealed very low levels of two OP pesticides. The district manager of this site also indicated that he planned to store rinse water in above- ground tanks and reuse it in subsequent pesticide applications.