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H <br /> N gra►, <br /> M <br /> Nomellini Construction page 2 <br /> 045 W . Charter Way, Stoektov <br /> The placement of MW- 12 and MW-10 has not completed the vertical extent <br /> investigation of the dissolved gasoline constituent plume. Additional vertical <br /> investigation is required . The EHD will require additional monitoring wells to be <br /> placed in MW-10 and MW- -1 2 areas that are screened in HU-4, as well as additional <br /> deeper monitoring wells for the vertical investigation/delineation . <br /> The EHD has noticed that there is no monitoring or shallow vapor well screened <br /> across the current water table in the areas around MW4 or MW-2 . A shallow, first <br /> interface monitoring well is required in these a,eas for iateral definition of the status of <br /> the first ground water unit. <br /> The work plan for further delineation required by the EHD in our May 11 2007 <br /> correspondence is to include details to destroy the monitoring wells screened in two <br /> permeable hydrological units, install replacement wells , and install additional deeper <br /> and first interface monitoring wells noted in this correspondence. Please submit the <br /> work plan to Geotracker by July 10, 2007. <br /> You may contact Michael lnfurna , Senior RENS at (209) 468-3454 should you have <br /> any questions. <br /> Donna Heran , REHS , Director <br /> Environmental Health Department <br /> � .�_. <br /> Michael J . lnfurna Jr. , Senior REHS Nuel Hendefson , PG <br /> LOP - Unit IV Engineering Geologist <br /> MI/ <br /> cc_ CVRWQCB — ,James Barton, Sacramento . <br /> AGE — Art Deicke, 837 Shaw Rd , Stockton . <br /> SWRCB-Clean Up Fund — Mark Owens, Sacramento . <br />