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Message `ter r _ Page.1 of 2 <br /> Jeff Wong [EH] <br /> From: Neely, Joe Uneely@cambric-env.com] <br /> Sent: Tuesday, August 02, 2005 5:38 PM <br /> To: Jeff Wong [EH] <br /> Subject: RE: Shell @ 2375 W. Grant Line Rd, Tracy <br /> Jeff: <br /> We typically watch the quarterly data to determine the effectiveness of this type of periodic groundwater extraction. Seeing <br /> sustainable, long-term, reductions in concentration in groundwater is the true test of this type of interim remedial approach. In <br /> some cases we have sampled prior to each (monthly) event to get a finer gauge on the concentration change over time, but we <br /> have found that this is a bit of an overkill and the quarterly data is sufficient. <br /> If you prefer we collect additional samples, I am willing to discuss the matter further. <br /> I will be on vacation through Aug 11, so we can continue this discussion then. <br /> Regards <br /> Joe <br /> -----Original Message----- <br /> From: Jeff Wong [EHJ [mailto:Jwong@sjcehd.com] <br /> Sent: Tuesday, August 02, 2005 9:44 AM <br /> To: Neely, Joe <br /> Subject: RE: Shell @ 2375 W. Grant Line Rd, Tracy <br /> Hi Joe: <br /> I've spoken to Margaret, and she agrees to go ahead and begin periodic groundwater extraction for now. Once we have more <br /> data from the initial event, we'll work on the frequency changes later, if required. <br /> What's your sampling strategy before, during, and after the extraction? Please reply so we can comment and document it. <br /> I <br /> regards, <br /> Jeffrey Wong <br /> Sr REHS <br /> SJCEHD <br /> -----Original Message----- <br /> From: Neely, Joe [mailto:jneely@cambria-env.com] <br /> Sent: Tuesday, August 02, 2005 8:33 AM <br /> To: Jeff Wong [EH] <br /> Cc: Baertschi, Dennis <br /> Subject: Shell @ 2375 W. Grant Line Rd,Tracy <br /> Hi Jeff: <br /> During our June 9, 2005 meeting with you, and in our subsequent 2Q05 Groundwater Monitoring Report, we discussed <br /> performing periodic groundwater extraction from wells MW-1 and MW-6. We would like to initiate this, but I wanted to hear <br /> back from you prior to moving forward. <br /> Periodic groundwater extraction would be done using a vacuum truck. Typically we would do this on a monthly basis, but I <br /> think it is best if we decide on the frequency of these events after reviewing data from the initial event(yield, time spent, <br /> cost effectiveness, etc). <br /> 8/3/2005 <br />