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i • <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H. Hickox GrayDavisDavis <br /> ` <br /> Secrerarl for Sacramento'Main Office a:.-� <br /> Environmental Intemet Address: http://wvvlv.s,.vrcb.ca.gov/—rvvgcb5 <br /> protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)233-3000•FAX(916)255-3016 <br /> i1 <br /> 24 August 2000 <br /> Mr. Mike Owens <br /> Fox River Paper Company, Ripon Mill co <br /> 942 South Stockton Avenue <br /> Ripon, CA 95366 <br /> GROUNDWATER INVESTIGATION, FOX RIVER PAPER COA11PANY, RIPON, SAN JOA QUIN <br /> COUNTY(Case File No. 449) <br /> Regional Board staff has reviewed the Work Plan for Continuing Subsurface Investigation, Fox River <br /> Paper Company's Ripon Facility, Ripon California that was submitted on your behalf by your <br /> consultant, Mr. David Kirk, of Lawrence & Associates (13 July 2000). This Workplan was prepared in <br /> response to a Regional Board request for additional investigation of the impacts to the shallow, semi- <br /> perched aquifer in the northeastern corner of the site and the intermediate aquifer in the central portion <br /> of the site. The Workplan describes four proposed new wells located to address the Regional Board <br /> concerns. Regional Board staff have the following comments to the Workplan: <br /> 1. The proposed locations and well construction details for the three, planned, semi-perched aquifer <br /> wells seem appropriate. The field geologist should select the gravel pack for the screened <br /> intervals based on field observations. <br /> 2. The proposed location of the planned intermediate well, TH-11, is appropriate. The proposed <br /> construction details indicate that the well will be screened from approximately 90 feet to 200 feet <br /> below ground surface (bgs). The proposed gravel pack extends from approximately 80 feet bgs <br /> to 205 feet bgs. While other intermediate zone wells (including production supply wells) at the <br /> Fox River property may be screened similarly, this is not ideal or appropriate for a groundwater <br /> monitol'n,- ��„1t. �t is preiera le 'G have a s'o i�t SCTCeiiili iiiwt vat G1 iw.itt'y tc: t vi ics�. It iS <br /> my understanding that the intermediate aquifer may be comprised of two flow zones that are <br /> separated by a clayey aquitard up to 20 feet thick. Based on interpretations made by consultants <br /> for Nestle, the uppermost flow zone of the intermediate aquifer may be encountered from <br /> approximately 140 to 160 feet bgs. Please screen through the uppermost zone of the intermediate <br /> aquifer only. <br /> 3. Your proposed construction indicates that it is planned to drill the boring for the new <br /> intermediate well to 300 feet bgs. Your consultant has indicated that the lower 100 feet of the <br /> boring (approximately 200 to 300 feet bgs) will be backfilled with bentonite pellets prior to <br /> reaming out the hole to set the well. Unless there is some underlying reason to explore to this <br /> depth, it is not necessary to drill this deep prior to setting the well. The pilot hole would <br /> probably be no deeper than approximately 180 feet. <br /> 4. Your consultant has proposed that water purged from the wells during development will be <br /> diverted into "temporary wash basins" and allowed to evaporate. Please explain this further prior <br /> to constructing the wells. While this may be acceptable for the well located within the Fox River <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />