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`, �..+ <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> o.•_��.eoG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl$org man,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> Director <br /> . Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> ,• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> •9�rFORtLaurie A.Cotulla,R.E.H.S. h <br /> Fax: (209) 464- Robert McClellon,R.E.H.S. <br /> Program Manager d 1 2004 Mark Barcellos,R.E.H.S. <br /> HARRY' S AUTO MART AMERCO REAL ESTATE CO <br /> JOHN & MAXINE FERRAIOLO R RINgR U-Haul #709-50 <br /> PO BOX 757 2721 N CENTRAL AVE #700 <br /> Lodi CA 95241 PHOENIX AZ 85004 <br /> Re: Petroleum Impact, Drinking Water Well at Frontier Motel <br /> 2639 N. Wilson Way <br /> Stockton, CA. 95205 <br /> San Joaquin County Environmental Health Department (EHD) was notified on February <br /> 17, 2004, by Fruit Growers Laboratory (FGL), that treated drinking water samples <br /> collected between the two Granulated Activated Carbon (GAC) treatment vessels, <br /> located at the Frontier Motel, were analyzed and the petroleum contaminant 1,2- <br /> Dichloroethane (1,2-DCA) has been detected above Maximum Contaminant Levels <br /> (MCL). <br /> This detection indicates that the first GAC vessel of the treatment system is being <br /> overwhelmed and allowing contaminants to pass onto the second vessel. <br /> EHD is concerned that the treatment system's original design and conditions to operate <br /> the GAC treatment system to remove the 1,2-DCA are no longer adequate, and the <br /> public drinking water is not meeting the Safe Drinking Water Act (SDWA) for the <br /> following reasons: <br /> 1. The water usage at the motel has significantly increased since the treatment <br /> system was originally designed. This increased water use may be contributing to <br /> the exhaustion of the GAC within both vessels at a faster rate than previously <br /> predicted. Current water monitoring frequencies may not ensure that safe <br /> drinking water is being supplied to Frontier Motel. <br /> 2. A ten-fold increase in water usagemay cause <br /> contaminant plume being drawn towards <br /> of the contaminant in the well due to the <br /> the well. The original design parameters <br /> able <br /> onof the GAC w thin both t <br /> o treat these higher <br /> concentrations of 1,2-DCA because of a faste exhaus <br /> vessels. If this occurs, unsafe water may be delivered to Frontier Motel. <br /> 3. The treatment system was designed with a 6.8-minute Empty Bed Contact Time <br /> (ERCT) instead of the required 30-minute EBCT. EHD and the California <br /> Department of Health Services (CDHS) approval of 6.8-EBCT design was based <br /> upon the understanding that this was a temporary means to meet the <br />