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C A M B R I A <br /> c March 14, 2001 <br /> Mr. Michael Infuma <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Via Fax and Mail <br /> Re: Temporary Groundwater Extraction System <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> © SAP Code <br /> Incident No.. 989 98996184 <br /> Dear Mr. Infuma: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this letter on behalf of Equiva <br /> Services LLC in to document an overflow incident with the temporary groundwater <br /> extraction system in place at this site. This letter is a follow up to my telephone call to you <br /> on March 13, 2001 informing you of this matter. <br /> Cambria has been operating a temporary groundwater extraction system at this site since <br /> August 2000. The system consists of a submersible pneumatic pump which pumps <br /> groundwater from well RW-IA into an aboveground Baker tank. A float switch in the baker <br /> tank shuts off the pump when the tank is full. The tank is emptied by a vacuum truck every <br /> other day. This groundwater is then transported to the Martinez Refining Company where it <br /> is recycled. <br /> Monday morning (March 12, 2001) the Baker tank overflowed. Personnel at the service <br /> station noticed the overflow and turned off the pump, which stopped the overflow. It is <br /> estimated that the overflow occurred over a 3 hour period before it was noticed and shut off. <br /> The estimated amount of water that overflowed from the tank is approximately 500 gallons. <br /> A vacuum truck was sent to the site that morning to empty the Baker tank. A Cambria <br /> Oakland, CA technician visited the site that morning to troubleshoot the situation. The float shutoff <br /> San Ramon, CA <br /> Sonoma, CA valve in the Baker tank is suspected of malfunctioning. It was evaluated and tested to <br /> determine if it needed to be replaced. It tested ok and was not replaced. The Cambria <br /> Cambria technician surveyed the site to determine where the water had collected and or where it had <br /> Environmental <br /> Technology,Inc flowed. Because the storm drain is located in the opposite corner of the site from where the <br /> Baker tank is located, it was obvious that the water did not enter the storm sewer. The water <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />