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Shell sites in San Joaquin County <br /> Page 2 <br /> 2320 El Dorado Street, Stockton <br /> EHD staff was not available to discuss this site. <br /> 2494 Fremont Street,Stockton <br /> ARCO has been named as a responsible party for the site (2478 E. Oak Street) to the north of this <br /> site and will be investigating the extent of the contamination at that site. Shell should evaluate <br /> whether remediation is necessary and feasible on their site. <br /> 2375 Grant Line Trag <br /> —T <br /> Groundwater extraction by a vacuum truck from MW1 and MW6 is being performed monthly to <br /> reduce the concentrations of MTBE in these wells. A presentation was made by Dan Lescure that it <br /> was not cost-effective to continue the vacuum truck groundwater extraction events and that <br /> monitored natural attenuation should be considered. EHD requires complete definition of the <br /> contaminant plume to consider this alternative. Although down-gradient off-site assessment is <br /> impeded by the location of Hwy 205, further investigation down gradient, across Hwy 205 is <br /> required. <br /> 341 Main Street,Ripon <br /> CRA will correct the table in the Case Closure Summary Retort and upload the revised report to <br /> GeoTracker. Once EHD has received this report,EHD will proceed with providing the needed <br /> information to the Central Valley Regional Water Quality Control Board for case closure <br /> consideration. <br /> 7700 Moreland Street,Stockton <br /> A closure report was submitted for review. <br /> 6131 Pacific Avenue. Stockton <br /> Dual-Phase extraction will be initiated once the City of Stockton issues Shell a permit to dispose of <br /> extracted groundwater to the city sewer. <br /> 3725 Tracy Blvd,Tracy <br /> A closure report was submitted for review. <br /> 880 Victor Road.Lodi <br /> The temporary groundwater extraction system will continue to be operated since the contaminant <br /> plume is not defined to the south-southeast and the adjacent property owners to the south and east <br /> have not allowed monitoring wells to be installed on their property. Extraction of groundwater from <br /> MW7 in the southeast corner of the property should be evaluated as a method to keep contaminants <br /> from migrating to the adjacent parcels. <br /> 4315 Waterloo Road Stockton <br /> EHD staff was not available to discuss this site. <br /> 1160 Yosemite Avenue Manteca <br /> A work plan addendum will be submitted to EHD that will possibly include installing another <br /> monitoring well or advancing a CPT boring located north of the site to investigate the groundwater <br /> contamination north of MW-3 and MW-4. There are safety issues to consider since this site is <br /> located at a busy intersection in Manteca. <br />