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Well Destruction Work Plan WEST CLAY PROPERTY 639 West Clay Street, Stockton, California 1.0. INTRODUCTION AdvancedGeo, Inc. (AGI) has prepared this Well Destruction Work Plan (Work Plan) for the destruction of the thirty-seven groundwater monitoring wells (37), seven (7) remediation wells and six (6) soil-vapor sampling wells at 639 West Clay Street, Stockton, California (site). The location of the site is illustrated in Figure 1. Structures, soil borings and well locations are illustrated in Figure 2. 2.0. PROCEDURES AGI proposes to destroy all monitoring and remediation wells using wire-line explosives. Well abandonment by wire-line explosives will be conducted by certified explosives expert Tylor McMillan of Well Services of Bakersfield, California. Initially, a cord of 50-grain Special wire-line explosives will be deployed down the entire length of the well casing to depths between 30 and 140 feet bsg. The explosives will be brought up to 10-feet below surface grade. Once the explosives are in place, the entire casing will be filled with the grout mixture as described below. Once filled, the charges will be detonated; SJCEHD and AGI staff will verify that the grout mixture has dispersed into the surrounding formation. The remaining space, following formation shrinkage, will be filled with the grout mixture to near surface grade. The wells will then be over-drilled to approximately ten feet bsg using either 8.25-inch or 10-inch diameter augers and then grout will be used to fill the boring to near surface ("mushroom cap"). All borings will be completely covered with either concrete or asphalt, depending on the surrounding surface material. The grout mixture will consist of a ratio of six gallons water for every 94-pound sack of Portland type II cement. The drill rig hollow stem augers will be utilized as a tremie pipe for installation of the grout seal. All six soil-vapor sampling wells will be over drilled with an 8.25-inch auger to a total depth of 7 feet bsg. Once the total depth has been reached, the augers will be retracted, and the boring trace will be grouted to near surface grade with neat cement. The surface at each location will be completed using rapid setting concrete. Rinseate generated during drilling and decontamination activities will be containerized in properly labeled Department of Transportation (D.O.T.)-approved 55-gallon drums and stored on-site until proper disposal is arranged to a suitable non-hazardous waste facility. Additionally, soil cuttings, well materials and construction waste will be containerized in a 10-yard soil bin until proper disposal is arranged to a suitable non-hazardous waste facility.