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California fegignal Water Quality Control Board <br /> u Central Valley Region } <br /> O A �'(`� Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. � r Arnold Schwarzenegger <br /> Agency secretary b�' Pp�\rE� rc..N Sacramento Main Office Governor <br /> )O OTa t,4t Internet Address: http:/Aw ,swrcb.ca.gov/—mgcb5 <br /> co P`ENV�N Q�QI 1020 Sun Center Drive,#200,Rancho Cordova,CA 95670.6114 <br /> Phone(916)4643291•FAX(916)4644780 <br /> VIA FACSIMILE <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 WORKPLANADDEADUM, CITY OFLATHROP,MBR <br /> WASTEWATER FACILITY,LATHROP,SAN JOA Q UIN CO UNTY <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. If 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 /> cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> John Fio, Hydrofocus,Dixon <br /> California Environmental Protection Agency <br /> W sS�ObnenTSan loaquinU.ethrop Ww�R Phase NCeamn 12 May OS.doc <br /> Cj Recycled Paper <br />