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Shell sites summary <br /> Page 2 <br /> The new property owner requested the GWE system be moved to the back northeast portion of the <br /> property. It is anticipated that this will be done by May or June 2006. Additional monitoring wells <br /> have been installed to continue to define the lateral and vertical extent of the hydrocarbon plume. <br /> Some of these wells may be used as extraction wells and connected to the GWE system. <br /> tr t <br /> 2320 El Dorado Street, Stockton <br /> EHD has not received information on the location of the former waste oil tank that was removed <br /> prior to 1984 from this site. Shell will review the file information for 2315 El Dorado Street and this <br /> site to evaluate if the TCE and PCE detected in the water samples at this site are from the former <br /> Shell waste oil tank or the 2315 El Dorado Street site. Shell requested that EHD write a directive <br /> letter to the responsible party for 2315 El Dorado requiring that monitoring and sampling of the <br /> j monitoring wells for the two sites be coordinated. EHD has not received a work plan for.down- <br /> 1 gradient monitoring well installation. The work plan should be submitted by April 22,2006. <br /> 2494 Fremont Street Stockton <br /> Shallow soil and groundwater contamination was found at the site to the north (2478 E. Oak Street) <br /> of this site. That site has been identified as aformer UST site and the responsible party has been <br /> directed to further investigate the extent of the contamination at that site. Shell will not be required <br /> to perform further investigation in that direction. EHD will prepare a comment letter for this site. <br /> The current monitoring wells do not provide delineation to the west and south where grab <br /> groundwater samples were previously collected that evidenced'contaminants. <br /> 2375 Grant Line,Tracv <br /> Groundwater extraction by a vacuum truck from MW1 and MW6 is being performed monthly in an <br /> attempt to reduce the concentrations of MTBE in these wells. Down-gradient off-site assessment is <br /> impeded by the location of Hwy 205. An SCM is being submitted. Analysis for lead scavengers in <br /> the groundwater at this site will not be performed since lead scavengers were not used by.Shell after <br /> 1991 and this station was constructed after that time. Shell may submit a co-mingled plume <br /> application with the 7-Eleven site directly south of this site to the State Water Resources Control <br /> Board Cleanup Fund. In order for EHD to agree that the plumes are co-mingled,complete SCM's <br /> with supportive and technically justified information must be prepared. <br /> 1071 Main Street,Manteca <br /> This site has received closure. <br /> 341 Main Street Ripon <br /> A fate and transport model will be submitted to EHD that demonstrates that the impacted soil at <br /> this site will not impact groundwater in the future. <br /> 7700 Moreland Street_Stockton <br /> MW7 has been found. A new deeper screened well has been installed and the soil and groundwater <br /> are non-detect for contaminants. Samples from the perimeter monitoring wells were non-detect for <br /> j contaminants. Water samples from MW3 that is in the source area has low MTBE concentrations. <br /> Groundwater monitoring will continue. <br /> The 6131 Pacific Avenue.Stockton l <br /> The dual phase extraction (DPE) wells were installed in January and a report of this work will be <br /> submitted to EHD. The fixed DPE system has been built but the permitting process may take 4 to <br /> 6 months. Shell felt initiation of interim remediation was not cost effective but agreed to use an <br /> i <br /> id <br />