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PAGE 2 <br /> sampling events. Chevron and Shell are hearby directed to participate in the <br /> coordinated sampling and monitoring events so that comparable data can be <br /> obtained. An effort will be made to standardize the groundwater elevation data to a <br /> known benchmark for more consistent data. <br /> Also, beginning in the third quarter of 1995, selected wells will be sampled for <br /> chlorinated hydrocarbons in addition to the gasoline constituents already being <br /> monitored. The quarterly report for this period is due at PHS/EHD by Friday, October <br /> 20, 1995. The sampling for chlorinated hydrocarbons will also be conducted during <br /> the first quarter sampling events. Selected wells will be sampled at feet below 3- ' <br /> grade using a bladder pump prior to purging. This technique will allow for a more <br /> consistent sampling throughout the area for more comparable results. Once this <br /> sample is obtained, the wells can be purged and sampled as normal for the other <br /> gasoline constituents. The Chevron and Shell stations located nearby on Charter <br /> Way are hearby directed to begin sampling for chlorinated hydrocarbons to establish <br /> baseline data. Subsequent sampling will be limited to perimeter wells unless <br /> supporting laboratory results warrant a more detailed sampling of the wells. This <br /> data will be used to evaluate the possible source of this contamination identified in <br /> the groundwater in the area. <br /> The next meeting is scheduled for 10:00 a.m., Monday, October 30, 1995, at the <br /> office of PHS/EHD. The additional data gathered by that time will be discussed so <br /> that progressive decisions/actions can be made by all parties. <br /> Donna Heran, R.E.H.S. <br /> Director of Environmental Health <br /> Liz,-- � <br /> t <br /> Diane M. Hinson, Supervising R.E.H.S. <br /> Environmental Health Division <br /> DMH/It <br /> c: CVRWQCB, Beth Thayer <br /> c: LOP files <br />