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Mike Infurna [EH] <br /> From: Todd Del Frate [TDelFrate@waterboards.ca.gov] <br /> Sent: Friday, June 01, 2007 7:30 AM <br /> To: LesChau@KennedyJenks.com; Meredith Durant@KennedyJenks.com; KellyH@olives.com <br /> Cc: HFERRIZ@envres.org; MikeMcLeod@KennedyJenks.com; BenH@olives.com; Mike Infurna <br /> [EH] <br /> Subject: Re: Musco Driling Schedule Update <br /> Kelly, thanks for the update. Did you happen to meter well MW-24 for TDS values. Just <br /> curious if you have some preliminary water quality data. When are the wells going to be <br /> developed and sampled. Most are ready to go. Please advise. Interesting to note both <br /> wells MW-1 and MW-24 reside at the same contour interval. <br /> Todd A. Del Frate P.G. <br /> Engineering Geologist <br /> Waste Discharge to Land unit <br /> Central Valley Region - RWQCB <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA. 95670 <br /> Ph: 916-464-4737 <br /> fx: 916-464-4775 <br /> >>> Kelly Hegman <KellyH@olives.com> 5/31/2007 5 :32 PM >>> <br /> We have just completed a well at the offsite location E, which I'll call MW-24. First <br /> encountered groundwater was at approximately 20 ' below ground surface within a well sorted <br /> fine sand grained unit (SP) . Water rose 7.2 feet and seemed to stabilize after 45 <br /> minutes. Above the SP unit are 15 ' of soft brown clays with some silt (CH to CL) . The <br /> aquifer was clearly confined and under some pressure. Drilling was terminated at 35 feet <br /> bgs and the well was screened from 15-35 ' bgs. Groundwater appeared to stabilize at <br /> 14.8 ' bgs, giving us approximately a 20 foot water column height. <br /> As for the offsite C location, drilling began on Tuesday and we ended the boring that day <br /> it 95' bgs. All samples showed no signs of free water. The 95' sample revealed a thin <br /> amp SM unit, with dense clays underlying it. This SM unit is at about the msl that we <br /> ,uld have expected to find shallow groundwater. The logic was that the augers may have <br /> sled that unit. So the boring sat for two days with the augers in place to allow any <br /> sible water to enter, as we went on to grout <br /> ' (aka "hedge well") . This morning I sounded the boring which proved to contain some <br /> Lure. We dropped a bailer down, but were unable to collect a sample. Only wet mud <br /> to the bottom of the bailer. An additional sample was collected by the driller this <br /> ig. The top 6" <br /> sample was wet, but not saturated. The drillers sampling tool was not wet. There <br /> early no signs of free water. We drilled another 10 feet, to possibly find another <br /> raring zone, but encountered only clays. I decided to pull 25 feet of augers out, <br /> 80 feet of augers in the ground to see if any water will seep through that SM unit <br /> is. As of 2 :30 pm this afternoon, there was no moisture. Tomorrow, I plan to <br /> boring again before drilling. If no moisture remains, then we will drill an <br /> 40 ' <br /> '.ng depth is 103 ' (2 feet of collapse) ) . If no free water remains, then we will <br /> s boring and grout it to the surface. <br /> expect a call from me around 10:00 am Friday morning. <br /> orward you the well schematics for the newly completed wells MW-13R and <br /> ,e you the specifics for the two grouted borings (FB-1, and FB-2) by the end <br /> I.eted on 5/24/07. Groundwater was 1st encountered within a 6" gravel sand <br /> Drilling was terminated at 45' bgs and the well was screened from <br /> )undwater was noted to be stable at 31.64 ' bgs before the well was <br /> 1 <br />