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1210 E. Hammer Lane, Stockton <br /> Page 2 <br /> • Any change in the characteristics of the contaminant plume will be <br /> evaluated by EHD and some wells may be required to return to quarterly <br /> sampling with analysis for all constituents of concern. Ultramar is to <br /> submit a chart/table that shows each well, the quarter it will be sampled, <br /> the analytes to be tested for and the analytical methods to be used. This <br />'r easy-to-read table should.be included in the next quarterly report to <br /> incorporate these approved modifications.- <br /> Recently, onsite and offsite subsurface borings were placed with soil and <br /> groundwater samples collected for laboratory analyses. The report of findings <br /> for this lasthase of work should include a site conceptual model. If data <br /> P P <br /> indicate that significant gaps in continuity exist or the lateral and vertical extents <br /> of the groundwater petroleum plume are,not defined, Ultramar is to include a <br /> discussion in the report on how and when the data will be obtained or definition <br /> provided. <br /> EHD appreciates Ultramar's willingness to investigate and remediate this site. <br /> and reduce costs where applicable. In the future, similar requests for modifying <br /> established investigative protocols should be supported by the site conceptual <br /> model. Cross sections with well screens and contaminant concentrations super- <br /> imposed are a great help in understanding movement and trends in the <br /> groundwater petroleum plume. <br /> Please continue to address your reports''and correspondence to Michael Infurna <br /> and you may contact him at (209) 468-3454 should you wish to call. <br /> Donna Heran, REHS, Director <br /> Enviro ental Health Division <br /> Michael J. Infurna , Senior REHS Margare agorio, R S <br /> LOP 1 Site Mitigation Unit IV Supervisor <br /> c: CVRWQCB — James Barton, Sacramento. <br /> c: SWRCB-CUF -- Mark Owens, Sacramento. <br /> c: Horizon — R. Smith, 5011 Golden Foothill Pkwy, #7 El Dorado Hills, 95762 <br /> i <br /> i <br />