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A-C4 Water samples were collected from the on-site well and from the ponded water in the area drain. Live fish (up to 12 inches) were visible in the ponded water at the time of sampling (10 June) . A sediment sample was taken from the area drain below the inlet pipe from the wash pad. A soil sample from 0-6" was taken from the loading area adjacent to the drain grate that leads to the area drain. Analyses revealed that the ponded water in the area drain had a few pesticides at very low levels and the pond sediment had several pesticides between 0. 3 and 28 ppm. Only thiobencarb in the sediment (at 4.1 ppm) exceeded the designated waste value based on 100 fold attenuation as presented in Dr. Marshack ' s staff report3•, The soil sample from the loading area had 10 ppm DDT and metabolites, thiobencarb at 24 ppm, and a few other pesticides at levels below the example designated levels pre- sented in Dr. Marshack ' s report. No pesticides were detected in the on-site well . The potential for water quality impacts from the existing residues needs to be evaluated. The practice of discharging pesticide rinse water to a drainage course must be stopped. 8. This facility serves two aerial applicator businesses. Most rinsing is done in a compacted gravel area from where water flows to an evapor- ation/infiltration area which has been amended with manure to retard pesticide movement and enhance biological degradation (the effectiveness of the amendment has not been evaluated) . The amended area also receives drainage from the pesticide container storage area. Two composite soil samples were collected from the amended area, one made from five samples collected at 0-6" and the other made from two samples collected at 18"-24". Several pesticides were present in surface soils including 23 ppm DDT and metabolites . Only DDT and metabolites (4.7ppm) and copper (23 ppm) were detected at 18" -24". It is possible that these materials were present at that depth due to past physical manipulation of disposal area soil . Water for equipment washing and dilution of pesticide solutions is supplied by a well located adjacent to the amended area. The sanitary seal on the well is relatively new, but it is unclear how effectively the well is protected from pesticides in the rinse water. An initial well sample taken from a hose bib was found to have 0.04 ppb each of en' dosulfan I, endosulfan II , and pp'DDT. A confirmation sample taken from a valve between the well and a pressure tank did not test positive for any organochlorine pesti- cides. The site owner has indicated a desire to install an' above-ground rinse water storage system. The amount of necessary cleanup of on-site soils with pesticide residues has not been determined. ��