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Lori Duncan <br /> From: Rusty Benkosky[rbenkosky@secor.com] <br /> Sent: Monday, December 11, 2000 10:35 AM <br /> To: Lori Duncan <br /> Subject: RE:ARCO 595, Work Plan dated 11/30/00 <br /> Lori, my comments are in color below. I hope this helps. Please call to discuss further, it is sometimes hard to explain <br /> everything via e-mail. <br /> Rusty Benkosky, P.E. <br /> Associate Engineer <br /> SECOR International- Sacramento Office <br /> rbenkosky@secor.com <br /> (916)861-0400 ext. 229 <br /> (916)861-0430- Fax <br /> -----Original Message----- <br /> From: Lori Duncan [<mailto:lduncan gophs.hs.co.san-ioaguin.ca.us>1 <br /> Sent: Friday, December 08, 2000 4:31 PM <br /> To: 'rbenkosky@secor.com' <br /> Subject:ARCO 595, Work Plan dated 11/30/00 <br /> Hey Rusty, I've called a couple of times without making contact so I thought <br /> I would send my questions about the work plan this way. <br /> 1. What exactly is meant by saying the borings will be continuously logged? <br /> It that the same or different from being continuously cored? Same as continuously cored. <br /> 2.Am I understanding correctly that there will be no soil samples for <br /> analysis collected from the borings? Yes, no soil samples from the boring will be analyzed. Soil samples from wells will be <br /> analyzed. <br /> 3. Will the water samples from the borings definitely be collected by <br /> Simulprobe, or are you also considering another method? I was going to use Simulprobe. Is the another method you <br /> would prefer? <br /> 4. Why are you proposing to collect discrete samples at 75-feet bgs? Two of <br /> the wells onsite are screened at this depth and the water is contaminated. <br /> Shouldn't we start deeper? Depth to water at the site is 57 feet bgs. We are starting aaproximately 20 feet below the <br /> initial depth to water. A well might be screened to 75 feet bgs, but the contamination is most likely at 57-60 and may be <br /> not down to 75 feet bgs. <br /> 5. Since you are proposing to use hollow-stem for the borings, wouldn't it <br /> be more cost effective to use them to construct deeper wells? There is <br /> documented groundwater contamination to 75-feet bgs already, deeper wells <br /> must be installed. It just kind of seems like a waste to me to fill the <br /> borings with cement and then drill more. In order to properly design a deep zone monitoring well, we need to know the <br /> lithology below 75 feet. We want to be careful and not install a well through an aquitard. <br /> Thats what I have so far. I will try calling again on 12/11/00. Lori <br /> Duncan <br /> 1 <br />