Laserfiche WebLink
San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> p ASSISTANT DIRECTOR <br /> z... - 600 East Main Street Laurie Cotulla, REHS <br /> Q: <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Mike Huggins,REHS, RDI <br /> 4�i Foa_°'%" Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley, REHS <br /> 08 May 2008 <br /> Swaran Chouhan <br /> 1632 Paola PI <br /> Manteca CA 95337-8512 <br /> RE: Super Center Mart <br /> 701 E Charter Way <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Additional Monitoring Well Installation Work Plan Addendum (WPA), dated <br /> 25 March 2008, prepared and submitted by your consultant, Advanced <br /> GeoEnvironmental, Inc. (ACEI). In WPA, AGEI proposes to install one single- <br /> completion monitoring well and two dual-completion monitoring wells. The proposed <br /> location of the single-completion monitoring well is on the west margin of your site to <br /> further delineate impacted groundwater toward the west and to monitor for migration <br /> of groundwater impacted by the unauthorized release of fuel hydrocarbons from the <br /> 641 E. Charter Way site. The proposed locations for the two dual-completion <br /> monitoring wells are on the south side of Charter Way to delineate impacted <br /> groundwater in several informally designated hydrologic units in the down-gradient <br /> direction at various depths below surface grade (bsg). <br /> The EHD approves the proposed scope of work as necessary and adequate [H&S <br /> 25296.10 (c)(3)), but recommends that the screen interval of proposed monitoring <br /> well MW-10B be increased to 10 feet and encompass the depth interval of <br /> approximately 81 to 91 feet bsg so as to include the 86 to 91-foot bsg depth interval <br /> that appears to be more permeable based on the log for CPT-3. The EHD notes that <br /> a 2-inch annular space must be maintained between casings and between the <br /> casings and the borehole wall in the grout interval. Also, when your site is ready for <br /> closure, monitoring wells that encounter contamination must be destroyed by <br /> overdrilling to completely remove all well materials; as proposed, this may require <br /> use of 12-inch augers to total depth (150 feet bsg) for the well destruction. You may <br /> want to consider installing clustered wells rather than nested. If so, submit a work <br /> plan addendum for the clustered wells or a work plan for eventual destruction of the <br /> nested wells to the EHD by 10 June 2008; the EHD will not issue the well installation <br /> permit until the well destruction issue has been adequately addressed. Although no <br /> explicitly stated in the WPA, the EHD infers that the previously approved monitoring <br /> WP Approval and Directive Letter 0508 <br />