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;ent By: RWOCB; • 2553015; Apr-11 <br /> 0)10:30AM; Page 3/3 <br /> Ranch Market, Riverbank - 2 - 10 April 2000 <br /> require installing a cluster of monitoring wells to determine the vertical gradient and deeper groundwater <br /> contamination. <br /> By 24 April 2000, submit a revised workplan which addresses the above concerns to define the lateral <br /> and vertical extent of soil and groundwater contamination on and off-site. All work must be performed <br /> according to the Tri-Regional Staff Recommendarions for Preliminary Investigation and Evaluation of <br /> Underground Storage Tank Sites as provided to you in our 8 December 1999 letter. We are available to <br /> meet to discuss investigation alternatives, if you wish. <br /> All reports and correspondence must be submitted to this office and Mr. Mike Infurna at the San Joaquin <br /> County Environmental Health Division. Please continue to contact me for site investigation and cleanup <br /> operations at the site,and Mr. Infurna for field oversight. Please contact Mr. infuma at least two <br /> business days prior to any site work or sampling to schedule a field inspection appointment. If you have <br /> any questions,please call me at (916) 255-3115. <br /> M Hl11 <br /> Associate Engineering Geologist <br /> cc: Ms. Sandy Gill, UST Cleanup Fund, State Water Resources Control Board, Sacramento <br /> Ms. Wennilyn Fua, UST Cleanup Fund, State Water Resources Control Board, Sacramento <br /> Mr. Mike Inftuna, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Jaff Auchterlonie, Secor International Incorporated, Sacramento <br />