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08/01/2005 14:04 707-67850 HYDROFOCUS INC • PAGE 01 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair (a <br /> Alan C.Lloyd Fh.D. Arnold Schwaraenegge <br /> Agency Secretary Sacramento Main Office Gmemor <br /> Intemet Addron: http://www,swob.m.gov/—rwgcb$ <br /> 11020 Son Ccnter Drive,#200,Rancho Cordova,CA 95670-6114 <br /> Phase(916)4643291 •FAX(916)464.4780 <br /> VIA la ACSMEILLE <br /> 12 May 2005 <br /> Cary Keaten Glenn Gebhardt <br /> City of Lathrop Califia LLC <br /> 16775 Howland Road 73 W. Stewart Road -- <br /> Lathrop, CA 95330 Lathrop, CA 95330 <br /> GROUNDWATER MONITORING WORKPLANADDENDUM, CITY OFLATHROP,MBR <br /> WASTEWATER FACILITY, LATIIROp, SAN JOA QUIN COUNTY <br /> I have reviewed the 26 April 2005 Groundwater Monitoring Workplan Addendum prepared by <br /> Hydrofocus,Inc. The Addendum responds to the Regional Board's 22 April 2005 Conditional Approval <br /> of Groundwater Monitoring Workplan. The workplan was prepared in response to Waste Discharge <br /> Requirements (WDRs) Order No. R5-2005-0045, Provision G.l.c. The 18 April 2005 Workplan,with <br /> the 26 April 2005 Addendum, is acceptable. Please proceed with the well installation activities. <br /> A number of existing wells are proposed for continued use as groundwater monitoring wells. This may <br /> be acceptable based on well construction and condition. Please evaluate each of the existing wells <br /> proposed for continued use and determine if their construction complies with.California Well Standards <br /> Bulletin 74-90. I£inadequate information exists to determine that the wells were constructed consistent <br /> with-Bulletin 74-90 then they shall be destroyed and replaced with new wells as described in the <br /> Workplan and Addendum described above. The Monitoring Well Installation Report required by WDRs <br /> Order No. R5-2005-0045 Provision G.Ld shall include boring logs and well construction details for all <br /> wells that will be included in the monitoring network. If no well construction detail is available,the well <br /> shall be investigated by video log or other means to determine the well construction. <br /> If you have any questions on this conditional approval or requirements for existing well installation, <br /> please telephone me at(916)464-4616. <br /> TIMOTHY O'BRIEN- <br /> Waste Discharge to Land Unit <br /> r,. <br /> cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> John Fio,Plydrofocus,Dixon <br /> California Environmental Protection Agency j <br /> RccyckdPaper f <br /> W:Uuaidmm'1l9viloWuw�I.s�hmp_WW7W.I9APbue rSatm l2 ALy 05,dpc ' <br />