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<br />Proposal for Fuel Leak Case Support Services <br />Redwood City, California <br /> <br />Proposal for Fuel Leak Case Support Services <br />Redwood City, California <br /> <br />Section 1: Background <br /> <br />The City of Redwood City (City) received a letter, dated January 31, 2005, from the San Mateo County <br />Groundwater Protection Program (GPP) regarding four potential fuel hydrocarbon release sites. GPP <br />requested the submission of separate work plans for investigation of each of the four sites by May 13, <br />2005. These sites are summarized below: <br /> <br />SMCo Case #330141 <br /> <br />Earth Tech removed an approximately 750-gallon UST during utility relocation for the Jefferson Avenue <br />Grade Separation Project in June 1996. Petroleum hydrocarbon contamination was detected in soil <br />samples from the excavation. The contamination was attributed to the general degradation of the <br />environmental quality in the area. Earth Tech prepared a UST Removal Report dated November 27, 1996 <br />and submitted it to the San Mateo County Department of Health Care Services. <br /> <br />The UST removal report shows that the tank was formerly located within the limits of excavation for the <br />Jefferson Avenue Grade Separation. Based on that, a number of activities performed during construction <br />of the Grade Separation also accomplished the cleanup of any residual contamination from this UST. <br /> <br />These activities included: <br /> <br />. <br /> <br />Removal of the UST, <br /> <br />. <br /> <br />Installation of the soil cement cutoff wall, which contained any hydrocarbons that may have <br />reached the groundwater table, <br /> <br />. <br /> <br />Excavation oflarge volumes of soil from the area around the UST, and <br /> <br />. <br /> <br />Extraction of significant volumes of groundwater. <br /> <br />Additional information about the UST removal is included in the Earth Tech project files. <br />Based on the above information, we propose to prepare a letter requesting case closure with no further <br /> <br />action. <br /> <br />L:GROUPIENVIPROPIR WC\4 USTSIPROPBK.DOC <br /> <br />Page 1 of 5 <br /> <br />February 2005 <br /> <br />'! <br />