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`I' <br /> 334 E. Main, Ripon <br /> Page 2 <br /> The Shell service station at 341 Main Street, across from this Chevron station, <br /> has performed groundwater extraction to remediate an MTBE groundwater <br /> contaminant plume at their site to protect public water wells operated by the City <br /> of Ripon within 1300 feet of the Shell station. The City of Ripon is concerned <br /> with contaminant plumes that may impact their wells, so you are requested to <br /> communicate with them about your site. The contact at the City of Ripon is Matt <br /> Machado. The mailing address is shown in the copy list at the bottom of this <br /> letter. <br /> During investigation of the lateral and vertical extent of the soil and groundwater <br /> contamination, a feasibility study to evaluate at least two alternatives for restoring <br /> and protecting the beneficial uses of the groundwater must be conducted. This <br /> information will be used in evaluating the most cost-effective final corrective <br /> action to be implemented at the site. <br /> I have enclosed two figures from a report on the Shell station that indicate the <br /> distances of the City of Ripon wells from that site (upper right quadrants of the <br /> figures) and possible divergence of groundwater flow directions between the <br /> shallow zone and deeper zone. The groundwater flow direction in a deeper zone <br /> varies from northeasterly to southeasterly, but diverges between southwesterly <br /> and northerly in the shallow ground water zone. The location of all wells within <br /> 2000 radial feet of your site should be identified and plotted on a base map, <br /> construction details of the wells should be provided to EHD, if available. A <br /> physical search for the wells may be necessary since in the past well logs were <br /> not always provided to the Department of Water Resources and permits may not <br /> have been required for well installation. Some private wells may still be located <br /> on properties along Parallel Avenue. This well survey should be submitted to <br /> EHD by March 1, 2003. <br /> EHD recommends you obtain information generated during Shell's site <br /> investigation, coordinate groundwater monitoring/sampling events with Shell and <br /> share data with Shell to determine the groundwater flow direction. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> I� W <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> Enc. <br /> c: Bill Brasher—SECOR <br />