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C A M B R I A <br /> 1. 1 <br /> August 24, 2004 <br /> AUG v ?fl04 <br /> Mr Richard StifflerN' <br /> ENVIR' <br /> City of Stockton Depart s_ti"�icip�al Utilities <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, California 95206-1191 <br /> Re GWE System Modification Report <br /> Former Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> Incident 98996184 <br /> SAP 136144 <br /> Dear Mr Stiffler <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambria Environmental <br /> Technology,Inc (Cambna)presents this GWE System Modification Report for the referenced site to <br /> document recent modifications to the groundwater extraction(GWE) system at the site <br /> Water from the transfer tank of the GWE system recently overflowed, as described in Cambna's <br /> 5-Day Incident Report, dated August 12, 2004 In order to address the root cause of the incident, <br /> Cambria removed the basket containing chlorine tablets, which had physically interfered with normal <br /> operation of the high-level float switch As an additional preventative measure, Cambria also installed <br /> a redundant float switch at the same level in the transfer tank as the existing high-level switch Both <br /> switches are wired to the control panel and will shut the system down should the water level in the <br /> transfer tank reach the designated high-level mark The product specification sheet for the secondary <br /> float switch is presented as Appendix A <br /> Cambria would like to resume discharging treated water from RWAA into the sanitary sewer under <br /> our existing permit,as soon as possible Please call Cynthia Vasko at(510)420-3344 to confirm that <br /> you have reviewed this report and that it meets your requirements in order to resume discharging in <br /> accordance with our groundwater discharge permit <br /> cambna <br /> Environmental <br /> Technology,Inc <br /> Hollis Street <br /> it.A <br /> Emeryville CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />