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Vi 0 • /PA E X 11244 Pyntes Way • Gold River,CA 95670 E N V # R 0 T E C H , I N C Phone 916 851 0174 • Fax 916 8510177• Toll Free 1 800 242 5249 December 8, 2005 �~V Apex Envirotech, Inc , Project Number NWP01 004 ENV,R(,,�r , PEi�, rl�,_q'oc�Er�� SUBJECT. Public Notification Letter—Discharge of Treater! Groundwater lC�S Flag City Shell, 6437 West Banner Street, Lodi, California 95242 To Whom It May Concern At the request of the property owner of the FIag City Shell, located at 6437 West Banner Street, Lodi, California, and in accordance with Attachment A of the California Regional Water Quality Control Board (CRWQCB) General Order 5-00-119 For Discharge of Groundwater From Cleanup of Petroleum Fuel Pollution To Surface Water, Apex Envirotech, Inc (Apex) is herby giving public notification that groundwater cleanup activities will commence at the Flag City Shell on or about January 2, 2006 The permitting process for Attachment A requires that a "Public Notification Letter"be submitted to adjacent properties, to the local County Health Department and to the Department of Fish and Game Flag City Shell is an active retail gasoline and convenience store This store has three underground storage tanks (UST's) (one 10,000-gallon premium gasoline, one 10,000-gallon diesel, and one 20,000-gallon regular gasoline) with associated pump islands The location of the site is east and adjacent to the Interstate 5 and Highway 12 intersection in Lodi, California A groundwater treatment system is proposed on the western section of the property (Figures I and 2) As a result of petroleum-impact to soil and groundwater at the Flag City Shell, the San Joaquin County Environmental Health Department (SJCEHD) issued a letter requesting additional monitoring wells to define the lateral and vertical extent of the groundwater plume and the installation of an intenm remediation system Therefore, Apex intends to install an on-site groundwater remediation system for treatment of extracted groundwater Groundwater will be extracted from five extraction wells utilizing dedicated submersible pneumatic pumps at pumping rates up to 4 gallons per minute (GPM) for a total discharge of approximately 20 GPM The groundwater will be routed to an on-site treatment system The groundwater will be treated initially by a bioreactor designed to consume MTBE and other gasoline constituents Two 1,000-pound granular activated carbon (GAC) units will be placed in series downstream of the bioreactor in the event of any breakthrough of contaminants from the bioreactor Sample ports will be located before, between and after the GAC vessels to monitor system performance