SITE INFORMATION AND CORRESPONDENCE

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�../ `✓ San Joaquin County Environmental Health Department DIRECTOR _.• r Donna Heran,REHS Q :a� 600 East Main Street Lo { Stockton, California 95202-3029 PROGRAM COORDINATORS Robert McClellon,REHS i '• Jeff Carruesco,REHS,RDI Website:www,sjgovorg/ehd Kase Foley,REHS Phone: (209)468-3420 Fax: 209))464-0138 arch 22, 2010 Frank Morita Rashad Hussain 6622 Belmont Place 814 E. Charter Way Stockton, CA 95207 Stockton, CA 95206 Subject: Former Morita Brothers Site Code- 1061 814 E. Charter Way Stockton, CA The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan Well Destruction (WP), dated January 29, 2010, prepared by Geological Technics, Inc. (GTI). The work plan was submitted in response to an EHD letter dated December 1, 2009, directing destruction of the monitoring wells in order to proceed with regulatory closure of your site; transfer of ownership of selected wells to the responsible party (RP) for a nearby site was also acceptable I The WP includes a copy of the transfer agreement between you and Beneto, Inc., the RP of a nearby site, for ownership of monitoring wells MW-11 and MW-208. It is proposed in the WP to destroy monitoring wells MW-1, MW-6, MW-7, MWA 06, MWA 07, MWA 08, MWA 09, and MW- 209 by drilling out and removing the well contents to total depth of each well, grouting to 5 feet below ground surface (bsg) and completing to surface with clean fill or neat cement to surface, i as appropriate for the surface material. The proposed grout mixture for well destruction was a neat mixture of cement containing less than 4% bentonite. It is also proposed in the WP to destroy monitoring wells MW-2, MW-4, MW-5, MW-104, MW- 110, MW-111, MW-202 and MW-210 by pressure grouting to 5 feet bsg, cutting off the upper 5 feet of well casing, and completing to surface grade with clean fill or grout as appropriate for the surface material. The EHD approves the proposed scope of work with the following modifications. • All grout shall consist of neat cement - 94 pounds of portland cement and 5 to 6 gallons of water with no bentonite added, • The upper five feet of the wells to be pressure grouted will be drilled out at a larger diameter than the original boring to five feet below surface grade, removing all well materials. The well will then be pressure grouted to five feet bsg and allowed to fill over the top of the remaining casing to form a `mushroom' cap; after the grout properly sets, the boring may then completing to surface as proposed. • Wells over-drilled to total depth should be grouted to the proposed 5 feet bsg and completed to surface as proposed Well Destruction WP Approval Letter 0310