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Vicky McCartney TreaftoWERdlo San Joaquin County Environmental Division 11 January 2005 Page 2 On 15 December 2004, Treadwell & Rollo conducted the fourth quarter 2004 groundwater monitoring. Groundwater samples were analyzed for the same analytes requested by SJCEHD in recent monitoring. The quarterly monitoring report for the fourth quarter of 2004 is currently being prepared. Based on historical sampling results and the planned configuration of the new parking garage, we anticipate that new monitoring wells will be installed in the sidewalk and in the parking garage after construction is completed. PROPOSED WELL DESTRUCTION ) II Three wells are in an area with groundwater impacts (MW- 1 , MW-2 and MW-3) and shall be destroyed by drilling out the casings and pressure grouting the holes. The remaining well, yal 7 MW-4, is located cross-gradient to the source area, has never had detectable contamination, and shall be destroyed by pressure grouting the well casing in place. After the new building is l �Jrh constructed, monitoring wells will be replaced as approved by the SJCEHD. All soil, groundwater and decontamination water generated during well destruction will be stored on site pending analytical results. All borings will be destroyed in accordance with California well destruction guidelines and SJCEHD requirements . The well destruction permit is attached. ysll� SCHEDULE Ar7 i1 �•Y - ?�' "' Demolition of the building and above-ground improvements will be completed by 21 January d 2005 . We would like to destroy the site wells during the week of 24 January 2005 . Please contact either of the undersigned with questions or comments. Sincerely, TREADWELL & ROLLO, INC. Dustyne Sutherland David G. Dixo G. Senior Staff Scientist Senior Project Manager 25971103 .DGD Attachments : Well Destruction Permit Application Figure 1 - Site Location Map Figure 2 - Site Map cc : Mr. Jay Coffey - City of Stockton IIS