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replaces the Site Characterization Work Plan Phase II dated 12 September 2008, which <br /> Central Valley Water Board staff conditionally concurred with in a letter dated 17 October <br /> 2008. This revised work plan incorporates the conditional elements specified in Central <br /> Valley Water Board staffa?Ts October concurrence letter, and addresses investigative items <br /> specifically requested in the 28 May and 9 July 2008 letters. <br /> The Revised Work Plan includes the following: <br /> a-? Seven shallow monitoring wells distributed along the north and <br /> south property boundaries. <br /> a-? Ten shallow borings sampled for nitrogen about every five feet <br /> to first groundwater, about 25 feet below ground surface (bgs) <br /> a-? Five deep borings sampled for nitrogen about every 20 feet <br /> extending to the depth of the on-site water supply well, about 195 feet bgs. <br /> a-? A groundwater extraction well terminating in the shallow water <br /> bearing zone. <br /> a-? An extraction well pump test for aquifer characterization. <br /> a-? All wells and borings will be sampled at about five foot <br /> intervals throughout the boring length and analyzed for nitrate and ammonium. <br /> a-? An isotope analysis will be conducted on shallow groundwater <br /> obtained from off-site monitoring wells RMW-1SR, RMW-3S and the on-site extraction well, <br /> and will be conducted on deeper groundwater obtained from offsite wells RMW-1D and RMW 3D. <br /> 11 <br /> and now the conditions: <br /> "Central Valley Water Board staff conditionally concur with the Revised Work Plan, subject <br /> to the following changes. <br /> a-? Before disposing of aquifer test water, provide evidence that <br /> the discharge location is acceptable to the receiver. <br /> a-? Provide an updated figure of boring locations that illustrates a <br /> deep boring near the western surface water sump (they can move boring locations around to <br /> meet the request) <br /> a-? Add an isotope analysis from groundwater obtained from the <br /> deeper water-bearing zone on-site, and identify where it shall be obtained from. <br /> Please submit the updated figure for Central Valley Water Board staff concurrence prior to <br /> implementing field work, conduct the field work prior to 31 October 2009, and provide a <br /> report of results by 26 February 2010. " <br /> I suspect that the final letter will not be substantially different than this. Just <br /> more verbage. <br /> Thanks for your time, <br /> If you have any questions, you may contact me at (916) 464-4680. <br /> Here's the Geotracker link to the work plan <br /> https://geotracker.waterboards.ca.gov/regulators/deliverable_documents/3431241691/Ripon% <br /> 20Work%20Plan0709%2Epdf <br /> Amy Terrell <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive Suite 200 <br /> Rancho Cordova, CA 95670-6114 <br /> (916) 464-4680 <br /> aterrell@waterboards.ca.gov <br /> 2 <br />