Laserfiche WebLink
Page 1 of 2 <br /> Mike Infurna [EH] <br /> From: Mike Infurna [EH] <br /> Sent: Tuesday, October 13, 2009 4:10 PM <br /> To: 'Tim Cuellar' <br /> Cc: 'rmarty@advgeoenv.com' <br /> Subject: Blvd Auto <br /> Regarding your phone call today about a revised work plan due at the <br /> EHD November 9, 2009 as noted in EHD correspondence dated October 8, 2009, 1 <br /> have reviewed the information and offer the following to clear up any <br /> misunderstandings. <br /> The original work plan dated 29 December 2008 called for 4 Geoprobes (P-17 to P- <br /> 20). The work plan called for investigation down to HU-2 (50' bgs). <br /> The EHD comment letter for this work plan is dated March 23, 2009 and on page <br /> two asked for a revision by April 3, 2009 that addresses the EHD concerns of <br /> continued lateral and vertical gw plume definition. We didn't like the limited depth of <br /> only HU-2. <br /> although at the time the contamination noted in MW-11 chambers was somewhat <br /> defined further NW by MW-13, and MW-14, and MW-8, the EHD was concerned <br /> with the gap between MW-7 & MW-8. <br /> although P-20 somewhat addresses this area, the depth proposed doesn't. HU-4 <br /> needs to be investigated also in the gap. <br /> A revision was to address this. <br /> P-20, if ND for all depths of concern and the gw plume direction is not towards the <br /> NNW, then for the time being the investigation in this quadrant can be <br /> considered adequate. But if the gradient continues to be NW, both Nuel and I feel <br /> with such a large area not being monitored between MW-8 and MW-19, additional <br /> wells will be required to investigate this gap. <br /> with the gw direction moving from historically NE to NW, the contam in MW-11 C <br /> and MW-19 contamination is really not characterized/delineated to the north. Draw <br /> a line from the SW, MW-8 to the NE, MW-23. There are NO monitoring points in <br /> the whole hemisphere north of this line except shallow MW-7. and the contam in <br /> MW-11 and MW-19 is already deeper than MW-7 screened interval. <br /> if P-20 gets hits, you'll be putting in MWs there real soon. <br /> So YES...send me a small revision that includes HU-4 investigation/gw grabs in P- <br /> 17 thru P-20. any MORE proposed borings can be included in the revision if you <br /> see the need. <br /> 10/23/2009 <br />