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• • Page 1 of 3 Mike Infurna [EH] From: Mike Infurna [EH] Sent: Thursday,April 23, 2009 1:49 PM To: 'Tamorah Bryant' Subject: RE: JM Equipment- Revision to Additional Site Characterization Work Plan after a quick and cursory review, your first recommendations look best. I'll get into detail as I prep the letter response to see if your proposal holds merit. thanks for the quick response. ( I KNEW I saw this request somewhere).. From: Tamorah Bryant [mailto:TamorahB@gtienv.com] Sent: Thursday, April 23, 2009 1:35 PM To: Mike Infurna [EH] Cc: Jenny Weese Subject: RE: JM Equipment - Revision to Additional Site Characterization Work Plan Mike, After a discussion you and I had a few weeks ago, GTI revised and resubmitted the 4th quarter 2008 groundwater monitoring report to request reduction in groundwater monitoring frequency: We also recommend revisions to the monitoring program as follows: • Routinely non-detect wells(MW-1,2,3,7, 10& 109)should be sampled and analyzed every two years, where the next sampling and analysis of these wells would occur during the 4th Quarter of 2010; • Routinely contaminated wells(MW-4,5,6, 8&9)should be placed on a semi-annual(every six months) sampling and analysis schedule,where the next sampling and analysis of these wells would occur during the 2nd Quarter of 2009. • Samples collected from routinely contaminated wells(MW-4, 5,6, 8&9) should continue to be analyzed for BTEX,TPH-G and MTBE. • Depth to water measurements for MW-4, 5,6, 8&9 on a semi-annual basis should provide sufficient information to estimate the groundwater gradient on site.During biennial events,we propose to collect depth to water data for all wells sampled. • Continue to prepare quarterly groundwater monitoring reports,in letter format where appropriate. This was re-iterated in our 1st quarter 2009 groundwater monitoring report (in letter format). If you are considering further reductions, I would like to propose the following: Routinely non-detect wells (MW-1, 2, 3, 7, 10 & 109) be sampled for BTEX, TPH-g & MTBE every two years • Wells with very low levels of contamination (MW-6 and MW-8) be sampled for BTEX, TPH-g & MTBE every two years • Routinely contaminated wells (MW-4, MW-5 & MW-9) be sampled for BTEX, TPH-g & MTBE on an annual basis or every two years Basis: MW-4: BTEX has routinely been reported in this well, although the concentration appear to be diminishing over time (since sampling began in 1999). MTBE has been sporadically reported in varying concentrations and warrants sampling on an annual basis or once every two years. It appears that some 2005 and 2006 data may have been impacted by the high levels of other constituents in the laboratory analysis. Perhaps MTBE could be discontinued if several annual 4/24/2009