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*bow r,.r San Joaquin County - .0 Environmental Health Department DIRECTOR Linda Turkatte,REHS A 1868 East Hazelton Avenue Stockton, California 952056232 PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, REHS,RDI 0.... Website:o.•R Website: www.sjgov.org/ehd Kasey Foley, REHS i F Rodney Estrada,REHS Phone: (209) 468-3420 Adrienne Ellsaesser, REHS Fax: (209) 464-0138 March 6, 2015 LLJ LLC c/o Leanne Scannavino 5463 Cherokee Road Stockton, CA 95215 Subject: Three Palms Grocery Site Code: 1830 6732 E. Highway 88 Stockton, CA 95205 The San Joaquin County Environmental Health Department (EHD) has reviewed Workplan for Well Destruction (Work Plan) dated February 27, 2015, prepared and submitted by your consulting firm Cardno ATC (Cardno) for the subject site. Cardno proposes to destroy monitoring wells MW-1, MW-2, MW-3, and MW-5 and vapor extraction well VW-4 by over-drilling the wells using augers with the same diameter as the augers used to install the wells to remove all installed well materials. Cardno proposes to destroy MW-4, VW-1, VW-2, VW-3, and VW-5 by pressure-grouting. The EHD approves the well destruction methods proposed in the Work Plan with the following conditions: • Mix neat cement (grout) at a ratio of one 94-pound sack of portland cement with 5 to 6 gallons of'clean' potable water; • Remove well boxes prior to destroying the wells; • Regarding over-drilled wells, fill boreholes with grout, pumped from the bottom of the borehole up to at least 3 feet bsg through a tremie pipe that extends to within 5 feet of the borehole's total depth; • Regarding wells proposed to be destroyed by pressure grouting, enlarge the diameter of the top 3 feet of the borehole at least one foot larger than the auger originally utilized to install the well; after the grout mixture has completely filled the casing, apply at least 25 psi pressure on the grout for ten minutes (destroy the well by over-drilling if the well casing is unable to withstand this pressure for this length of time); cut off and remove the casing 6 inches above the bottom of the excavation before inserting grout into the excavation to create a "cap" with a vertical thickness of one foot; this "cap" must be installed in one continuous pour immediately after the well has been destroyed; • All Investigation Derived Wastes (IDW), including all soil cuttings, debris, and groundwater generated from well destruction activities, are required to be properly containerized, labeled, stored and disposed; • A well destruction report describing all well destruction field activities and including the receiving facility-signed manifests for the disposed IDW must be submitted to the EHD.