Document 4a3pNgnEo9275aBOar3pYD5dN

AR226-2558 Andrew S Hartten 05/31/2001 03:29 PM To: wentworth.william@ epamall.epa.gov cc: Robert L Ritchey/CL/DuPont@ DuPont, Isidores J Zanikos/AE/DuPont@DuPont, Andrea V Malinowski/AE/DuPont@DuPont, Alison A Crane/AE/DuPont@DuPont Subject: Information on W ashington W orks Facility B ill, The following provides answers to your questions in the May 23 memo you sent me, which Is attached. Per our conversation today, I'm faxing to you hard copy analytical results and the pertinent portion of the site NPDES perm it m odification (to add to the original perm it which you have). If any inform ation or data is missing, please le t me know and I'll get that info o r data to you asap. Based on your questions: The m ajority o f C-8 emmissions do not pass through the site W W TP, but go directly from the Teflon process to and through NPDES perm itted O utfall 005. The quantitiy o f C-8 discharged directly via 005 is estim ated to range between 40,000 and 60,000 Ibs/year, fo r recent years (recent, 2001 results being sent). By contrast, the amount o f C-8 being discharged via on-site production w ells (including G allery.which really collects rive r water) would conservatively total 200 Ibs/year (using worst case o f 16 ppb at Ranney W ell fo r a ll production w ells). A more realistic num ber would be 50 Ibs/year using actual concentrations and flow rates at all site production wells. The C-8 discharges via O utfall 002 would prim arily be from production w ells (i.e ,, used fo r non-contact cooling), hence the relatively low concentration at the outfall (recent results being sent). It is im portant to note that forecast discharges from Teflon via 005 should drop to approx. 20,000 lbs in 2001 with the late w inter 2001 start-up on the new carbon adsorption treatm ent unit (Note: you'll notice a drop in C-8 results between Feb/March and A pril). As experiences are gained and im provem ents are implemented, It Is believed these discharges should reduce to approx. 5,000 Ibs/year. As required by the NPDES perm it m odification, we began m onthly m onitoring in February o f O utfall 005 and 002 fo r C*8, and have verbally com m itted to quarterly monitoring o f the Ranney, Gallery, and W est Field (combined flow) production w ells (results being sent). Recent NPDES sampling results are being forwarded. It should be noted that m ost organics have been below detection lim its. Acute to xicity is measured annually, with recent testing Indicating zero m ortality fo r daphnia and fathead minnows or "no toxicity demonstrated", Please note th a t year 2000 annual prodcution w ell sam pling event summary we recently submitted to you provides up-to-date analytical results fo r key on-site production wells. I hope this anwers your questions and the inform ation being sent meets your needs, A s I indicated previously, please contact me if anything Is missing o r you need additional info. Andrew Forwarded by Andrew S Haffien/AE/DuPont on 05/31/2001 02:07 PM------------- -- Wentworth.William@epamaii.epa.gov on 05/23/2001 04:47:44 PM EID316910 To: Andrew S Hartten/AE/DuPont ce: Subject: Information on W ashington W orks Facility Andrew - i would appreciate if you could provide me with the following information. m d i f m S T TM ih . x m t t t , t 9 . out . putt i t t * " : S T 5 S i a b .i i r jut ,ou i TM S" !E rii S a w r s jre-fir-s - DuPont r TM ! t s fU o m ^ h e ' p l a n t discharge of the untreated S S t S S T c S S i S S i o r . IS **y y ~ " W * ' I *" " t o .u it. to . *u ,,s" r s r ? , S u t i s ;? S s i .ta. may I have a copy that would indicate the frequency of sampling s rX tlo fitrir^ tU " ** >. 1^ " f your most recent NPDES analytical results. S^L^oSd^ results from all of the potable wells found on site. gyissrs*s^iarsT "sisissssrus" (groundwater capture system) - correct? could you provide me with a copy of the most recent analytical results for all of the on-site production wells. Thank you for your help. Bill. ID3169H