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4 <br /> Mr Harlan Knoll, R E H S <br /> December 30, 2005 <br /> • Page 4 <br /> Static groundwater elevation monitoring over a five day period faded to reveal a hydraulic <br /> connection between the shallow water bearing units screened (10 to 30 feet below grade) in <br /> monitoring wells MW-1, MW-2, and MW-4 and Thornton Municipal Well No 2 that has a 70 <br /> foot well seal <br /> Lack of hydraulic interconnection between the shallow units and the Municipal well is consistent <br /> with the persistent reporting of"ND" for fuel hydrocarbons in water samples from Thornton <br /> Municipal Well No 2 between October 1991 and April 2002 when the nearest monitoring well <br /> (MW-4) was reported with the highest concentrations of fuel hydrocarbons 40,000 µg/L TPH- <br /> gasol2ne, 110 pg/L benzene, and 30 pg/L MtBE <br /> Please do not hesitate to email h2ogeolkcomcast net or call the undersigned at 925-373-9211 <br /> and/or telefax at 925-373-9222 should you have any questions <br /> Sincerely, <br /> O S�pNAL c <br /> i OvvZ u) <br /> �R CAL�� CERr►r� -f <br /> N� S'D &rsr <br /> SCF CaUF�� <br /> Gary D Lowe, P G (3768), C E G (1559) <br /> C HG (127) <br /> Principal, Hydrogeologist <br /> H2OGEOL A Groundwater Consultancy <br /> Xc <br /> Mr Ronald J, Barber, Jr, R B Construction, Inc 4460 S Hwy 99, Frontage Road, <br /> Stockton, CA <br /> Mr James Barton, Californma Regional Water Quality Control Board, Central Valley <br /> Region, 11020 Sun Center Drive, Suite #200, Rancho Cordova, California 95670-6114 <br /> H 2OGEOL A GROUNDWATER CONSULTANGY <br />