SITE INFORMATION AND CORRESPONDENCE

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i Vogue Cleaners page 2 j 2315 N. California St., Stockton ! work plan comment letter i Prior to approving the installation of MW-1 S&D and MW-6S&D, EHD requires that you submit a revised well construction detail that demonstrates what type of centralizers will be used, where the centralizers will be placed, and confirmation that an over-bore destruction for this nested well in the future will be done with at least a 14-inch auger. An alternative to the 'nested' well installation w uld be to 'cluster' the well construction, that is, placing the casing for MWA S and the casing for MWA D (as well as MW-6S and MW-6D) in separate 8-inch boreholes, installed within 5-feet i of each other. Monitoring wells installed in this manner would only need an fl- inch auger for the over-bore destruction and not the 14-inch auger required for a 10-inch, nested well destruction. Detectable amounts of 1,2-DCA are present in existing MW-1. In order to properly destroy this well, the contents of the b rehole must be removed and the hole grouted with neat cement (over-bore destruction). Pressure grout destruction is not approved for this-well. I Although necessary, the work plan to destr y MWA by pressuring grouting and replacing it with nested monitoring wel MWAS&D and installing nested MW-6S&D is inadequate and not apr roved as submitted [H & C. 25296.10(c)(3).]. Please provide a revision thE t addresses the concerns noted above. You may contact Michael Infurna at (209) 468-3454 if you have any questions. Donna Heran, REHS, Director Environmental Health Department Michael J. Infurna Jr., Senior REHS Margareagorio,gRX LOP 1 Site Mitigation Unit IV Supervisor MI/ c: CVRWQCB — James Barton, Sacramen o. c: SWRCB-CUF — Barbara Rempel (CUF 11775) c: Foothill Engineering - M. Vlach, 8442 S ory Ridge Way, Antelope CA., 95 43.