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Amador Chemical Company -2- 13 May 1986 Storm water characterization has never been performed. Wastewater pond samples from 1982 indicate the presence of various heptanes , hexanes, octanes, and alkanes. Amador Chemical officials stated the wastewater currently contains dichloromethane, toluene, perch Ioroethylene, acetone and non-ionic surfactants. Samples taken on 1 May 1985 from the above-ground storage tank are as follows. Designated levels , based on a 100-fold attenuation, are presented for compari- son. Concentration, mg/l Designated Level , mg/l I Chloroform 7 0.019 Dichloromethane 350 0.019 Tetrachloroethylene 3 0.400 Toluene 14 10 Freon 113 2 -- Ethanol 140 -- Unknown 98 -- POTENTIAL IMPACTS 1. The 1 May 1985 sample indicates the current wastewater should be classified as a ' designated waste' . Historical data concerning the wastewater is not available. It is apparent from the inspection that design of the lined ponds does not conform with Subchapter 15 regulations. The clay ' lined' pond, in particular, was constructed by simply mixing bentonite with native soil . Verification of the pond' s integrity, via a leachate collection system or in situ permeability testing, has never been performed. No storm water monitoring has occurred historically. Infiltration rates in the storm water pond (#4) have been increased by removing the 'hardpan' layer ( approximately 3 feet below grade) during construction. Any con- stituents entering the storm water pond could migrate to ground water. It should be noted that substantial ground water pollution may have occurred at a nearby industrial facility which also utilizes a pond disposal system. Consequently, chemical compounds, at concentrations of concern, may have reached the ground via their past disposal in on-site evaporation/infiltra- tion ponds. 2. The drum wash area should be inspected for its potential impacts on water quality. Amador Chemical should develop proper disposal options for the drum wash solution. 'Designated wastes' must be disposed of at Class II facilities, at a minimum.