SITE INFORMATION AND CORRESPONDENCE

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0 Page 1 of 1 Mike Infurna [EH] From: Les Chau [LesChau@Ken nedyJenks.com] Sent: Wednesday, May 30, 2007 5:46 PM To: Todd Del Frate; Meredith Durant Cc: BenH@muscoolive.com; Mike McLeod; KellyH@olives.com; Mike Infurna [EH] Subject: Summary for this morning conference call The following items were discussed in this order and decisions made. 1. The exploratory boring "intended hedge well" bottomed at a depth of 225' bgs has no detectable water. The decision was made to pressure grout the hole in lieu of completing a well at this location. This will be �1 competed today. 2. Thursday-Musco and KJ will further discuss possible locations for the actual Wells A/B of designated background monitoring. Currently, we do not believe that the location marked offsite -across the fence -is adequate because of the high possibility that there will be no detectable shallow GW. We note that it is the shallow GW that is foremost in establishing GW quality for the site as in background ambient concentrations. We may have to separate the pairing of these two wells with the shallow (Well A)relocated further up hill about a 1,000'due west and south of MW-61R. The deep (B)well may be proposed further east or northeast to help encounter deep GW. These locations will be discussed with Todd Del Frate prior to Friday's meeting. 3. Today (Wed) - Boring Well C was advanced to 95'bgs (405' MSL)last evening, no GW was encountered. The nearby well MW-1 has GW levels steady at 399' MSL. Decision was made this morning to advance the boring to another 50 feet bgs to attempt to encounter what was anticipated to be shallow groundwater. �4/ If GW is encountered at reasonable depths (shallow or deep), a well will be constructed. This drilling is expected to be complete by Th Mday. 4. Thursday - Upon completion or termination of exploratory well C, the drill crew will mobilize to Well E. It is again expected to encounter shallow groundwater. This will end the week of drilling 5. Friday - RWQCB Meeting. A location for an upgradient well —200 feet due south from MW61R will be proposed (see Letter to Board dated . It is not determined whether this location is more viable for shallow GW background monitoring (see Item 2). It does however stand a better chance of encountering shallow GW because of its location being further up hill than the currently marked location for Well A. 6. Friday-an additional deep GW monitoring well will be proposed near MW-15 to further investigate very deep GW, its origin, and extent. Please send comments and correction anytime. Les Chau Principal Hydrogeologist Kennedy/Jenks Consultants 415-243-2496 (SF Office); 650-852-2800 (Palo Alto); 415-370-8050 (cell phone) 5/31/2007