SITE INFORMATION AND CORRESPONDENCE

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i U C) OCT-M-096 W:54 RE6ESESIS. P.03i i extraction test. In it non-adveative sitpatioti the ra gnesium levels are essentially not changed as the ORC is virtually lnaolmble and elevated concentrations can only exist in the vicinity of the well. Actual- field data from the University of Waterloo indicates the rinagnesium levels in the vicinity of the well only elevate to 'a few ppm above background. I The only remaining issue, relative to a Class III disposal, is whether or not the ORC Filter Soc4j,'have absorbed minor amounts of the target hydrocarbons during exposure to vontaminated groundwater. This is highly unlikely as the surface of the ' sock would be in a very highly oxygenated zone where remediation is maximal. Even if a sock was' dissipated of oxygen, unless the socks are placed in wells with free product,'; it is highly unlikely they. would have hydrocarbon concentrations in excess of they groundwaterin the well they are removed 4om. These levels would generally be l'insignificant once the sock is being considered for solid waste disposal where the actionable standards are mush high6r. Furthermore, it is clear that if the spent materiril was exposed to the air�t would soon dissipate or be further remediated since it would retain moisture for a period. Spent product set on a tarp and exposed to air. wouid'iprobably allow ND to be reached in a short period on the assumption compounds were present. i Should for any reason the disposal requixements become more rigorous than Class 111, then it is probably easiest to simply dispose of the spent filter socks in drums, in a similar manner as PPE used at the site, at a cast of approximately $100 per 55 gallon drum:' For each of the Reg=osis ORC Filter Sock products there are the following approximate unit disposal charges. Filter Sock"Size Numbar/63 ga.l Dram Unit Disposal Cost 6-inch diameter . 15 to 20 $3.75 to $5.00 4-inch diameter 45 to 60 $1.25 to $1.66 2-inch diameter 110 try 150 1 $0.50 to $0.66 In a typical scenario, 150 socks would The in a barrier, and would be changed out twice a year.'; A total of 300 socks wmid therefore cast between $ 150 and $1500 per year for disobsal depending on size, not including drum cost and labor for retrieval and handling. r T ago � www -v-w..www..N.IAMr.www�www..nww.n-rr��r.�-N-M.�w..w-+nw-.w.wN.' Bioremedlation Pf odUCtS 27130A Paseo Espada,Ste 1407, San Juan Caplstmno,CA 92675 Phan;714443-9138 Fax 714.453-3140 f T TOM P.03 k __ _._ 4/6.'d , 00ES-899(9T6)(9W00)9143-039'1S3M T2:7T 96, 20 100; !