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San Joaquin County °YAN Environmental Health Department DIRECTORDonna Oeran, REHS 600 East Main Street Stockton, California 95202-3029 PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco,REHS, RDI Kasey Foley,REHS CQ�1XpR�\P Website: www.sjgov.org/ehd Linda Turkatte, RENS Phone: (209) 468-3420 Fax: (209) 464-0138 November 7, 2011 Mr. Allan Fetters Ripon Farm Service Incorporated 3660 Arrowhead Court Stockton, California 95219 Subject: Ripon Farm Service Incorporated 932 East Frontage Road, South Highway 99 (Formerly 22871 South Highway 99) Ripon, California 95366 Dear Mr. Fetters: The San Joaquin County Environmental Health Department (EHD) has received a No Further Action Required Concurrence letter from the Central Valley Regional Water Quality Control Board (CVRWQCB), dated 01 November 2011, for the above referenced site. It is now necessary to plan and execute the destruction of all wells installed as part of your site investigation and remedial action, as the EHD will not issue a Case Closure Letter for this site until the wells have been properly destroyed and all onsite waste material has been removed and properly disposed. The wells are,to be destroyed within 90 days of the date of this letter, or current analytical data for groundwater collected quarterly from the wells shall be submitted for review until the wells have been properly destroyed. The EHD has received Well Destruction Work Plan (work plan), dated 26 July 2011, submitted by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE), for the destruction of 24 wells associated with your site. In the work plan, AGE proposes to check each well for obstructions and if found, remove the obstructions prior to destroying the well. AGE proposes to drill out and remove the materials used to construct impacted monitoring wells MW-4, MW-9 and MW-10, and vapor well VW-1, then backfill the boreholes to surface grade with neat cement. In addition to the three monitoring wells and one vapor well, the EHD directs that the remaining 20 wells (MW-1 through MW-3, MW-5, IAS-1 through IAS-4, VW-2, VW-3A, VW-313, VW-4 through VW-8, VW-9A, VW-913, VW-10 and VW-11) also be destroyed by drilling out and removing the well contents since soil data available for most of these wells and confirmation soil samples collected in 2003, indicate the presence of residual petroleum hydrocarbon contamination. AGE proposes to over-drill the impacted wells using eight-inch or ten-inch diameter hollow- stem augers. The EHD approves the use of eight- or ten-inch augers to over-drill all wells except vapor wells VW-1 and VW-2. These two wells have two nested casings in each borehole that were originally installed using ten-inch augers. The EHD directs that fifteen-inch augers, centered on the deeper of the two nested casings, be used to destroy VW-1 and