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WE <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> pUIN SAN JOAQUIN COUNTY Unit Supervisors <br /> OP,........C <br /> �, _�f�.,oG Carl Borgman,R.E.H.S. <br /> Donna K.Heran,R.E.H.S. '04 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> a: <br /> Director Douglas W.`Nilson,R.E.H.S. <br /> Al Olsen,R.E.H.S. StOC1aOTl, California 95202-27 <br /> Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Robert McClellon,R.E.H.S. <br /> 4�i F Oi ` Laurie A.Cotulla,R.E.H.S. Fax: (209)464- -1C 0 } 2004 Mark Barcellos,R.E.H.S. <br /> Program Nfanaget. ,• <br /> AMERCO REAL ESTATE CO <br /> HARRY' S AUTO MART R RIN-FR U-Haul #709-50 <br /> JOHN & MAXINE FERRAIOLO 2721 N CENTRAL AVE #700 <br /> PO BOX 757 PHOENIX AZ 85004 <br /> Lodi CA 95241 <br /> Re: Petroleum Impact, Drinking Water Well at Frontier Motel FILE COPY <br /> 2639 N. Wilson Way <br /> Stockton, CA. 95205 <br /> was notified on February <br /> San Joaquin County Environmental Health Department ated drD�inking water samples <br /> 17, 2004, by Fruit Growers Laboratory ( ) treatment vessels, <br /> collected between the two Gran reta aaA zed ae d the petroleum Carbon ) contaminant 1 ,2- <br /> located at the Frontier Motel, y <br /> Dichloroethane (1,2-DCA) has been detected above Maximum Contaminant Levels <br /> (MCL). <br /> This detection indicates that the first GAC vessel ss onto the second vessel. is being <br /> overwhelmed and allowing contaminants to p <br /> ns to <br /> E <br /> HD is concerned that the treatment system's original design <br /> longer adequate,ditio and the the GAC treatment system to remove the 1,2-DCA afor the <br /> public drinking water is not meeting the Safe Drinking Water Act (SDWA) <br /> following reasons: <br /> usage at the motel has significantly increased since the treatment <br /> 1 . The water contributing to <br /> system was originally designed. This increased water use maypreviously <br /> the exhaustion of the GAC within both vessels <br /> a faster rate than may not ensure that safe <br /> predicted. Current water monitoring frequencies <br /> drinking water is being supplied to Frontier Motel. <br /> e may cause there to be higher concentrations <br /> 2. A ten-fold increase in water usag Y <br /> of the contaminant in the well due to the contamin ba able to brela9taese higher ds <br /> the well. The original design parameters may not <br /> concentrations of 1,2-DCA because of a faster exhaustion f the Motel. <br /> Cwithin both <br /> vessels. If this occurs, unsafe water may be delivered <br /> 3. The treatment system was designed with a 6.8-minute Empty Bed Contact Time <br /> (EBCT) instead of the required 30-minute EBoc al of 6 8 EBCT design. EHD and the was based <br /> upon trnia <br /> he <br /> understanding nt of lthat thith Services s was a temporary means to meet the <br /> upon the <br />