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• Work Plan - Tosco (Former BP Oil) Station No 11194, Tracy, California <br />Apn125, 2000 <br />Task 3 Performance Testing <br />In conjunction with the initial groundwater purging event, GR will conduct a performance <br />test to qualitatively analyze the influence generated during removal of 5,000 gallons of <br />groundwater from the purged wells During purging, GR personnel will attempt to collect <br />depth to water (DTW) readings from the wells in use (AMW-5, OBS -E and OBS -W) In <br />addition, DTW readings will be collected from the UST pit observation wells and <br />monitoring wells in the vicinity of the purged well DTW readings will be collected <br />continuously, beginning prior to initiation of groundwater purging until groundwater levels <br />have recovered sufficiently following completion of purging The observed drawdown in <br />the purging well and observation wells will be utilized to form a qualitative estimate of the <br />influence around the purged well The results of the performance test will be presented in <br />the first status report <br />If you have any questions regarding this report, please feel free to call either of us in our <br />Dublin office at (925) 551-7555 <br />Sincerely, <br />Gettler-Ryan Inc. <br />Jed A Douglas <br />Project Geologist <br />Doug as Lee <br />Project Manager <br />R G No 6882 <br />1; <br />Attachments Figure 1 - Site Plan <br />GR Field Methods and Procedures <br />14018704 <br />9 <br />