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Well Destruction Work Plan — Addendum LOPEZ PROPERTY — TAYLOR 1601 Turnpike Road, Stockton, California 1.0. INTRODUCTION At the request of Ms. Karen Taylor, AdvancedGeo, Inc. (AGI) has prepared this Well Destruction Work Plan — Addendum (Work Plan) for the destruction of the thirteen (13) ozone sparging wells (0-1 through 0-13) at 1601 Turnpike Road, Stockton, California (site). Structures, soil borings and well locations are illustrated on the attached site plan. AGI is requesting drilling permit modification approval from San Joaquin County Environmental Health Department (SJCEHD) to destroy all former ozone sparging points using wireline explosives in place of tradition auger drilling techniques. This change is scope is being requested due to the large grout columns and the 3/4-inch well casing that was used to install the ozone sparge points, which will likely cause traditional auger drilling to veer off the original boring trace. The proposed destruction method is more cost effective and will properly remove each of the proposed wells. 2.0. PROCEDURES AGI proposes to destroy wells 0-1 through 0-13 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 32 (shallow) and 66 feet bsg (intermediate). 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 8.25-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. 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