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WaM Plan for the Oeoommosionina 0 LINL Site 30o Wada genet I . Prior to drilling, obtain any requlmd permlls or access agreements (e.g. County perrnits for well destruction and pmpertyowner access agreements). 2. Remove any installed pumps or piping from [be inside of the well rasing and document the condition ofthe well completion using video lugging. 3. Remove airy above-grotmd surface completions. stovepipes will be nnlwlled from concrete pads. Concrete pads will bo removed from the ground surface. 4. Document the depth-to-water, total depth of the wen, and the time and date or the well decommissioning (star and finish times). 1.1 Over Dolling: 1. Drill out Me casing using hollow than auger, into-sonic, mud rotary, or a combination of these aril ling methods, as determined by Me ERD hydrogmlo ggy team and the drilling contractor. 'I lie drill bit used for over drilling should he slightly larger in diameter than the original wen borehole to remove all of Me annular material. prior to drilling, the surface completion will be removed, it necessary, to allow access to the well casing. 2. to Me cancer f sible, ensure that the entire casing has been removed. Whennsing a drill bit, frequently check and document that pieces of casing are in the callings. Also, note any decrease in drill OR chairing which may indicate Mauhe bit has activated offthe casing. 3. Once the well and annular material have been completely removed, calculate the volume of neat cement gout acquired to fill the open borehole. 4. Neat cement grout should be composed of one bag (94 pounds) of Portland Cement to five to ten gallore Ofpatable water as detailed in the San Joaquin County Well Snmdards (San Joaquin County Ordfrunce Code Section 9-11156). 5. Place the neat cement grout W the bottom of Me borehole via tremie pipe. The boring should be filled until undiluted neat cement growl Meows lion the borehole at groomdsurface. the tremie pipe should be withdrawn gradually during this Process. 6. Verify that Me amount organ pumped is equal or greater than the calculated volume. J. While waiting for the grant to set, cover and barricade Me humbole to prevent introduction of fixeign material and to protect the public. After the Smut has set, the grouFfilled borehole will be over drilled to 3-5 feel below grade then back- filled with clean uncontaminated fill material to a tovel Mat is even with the adjacent ground. For off site wells, up to 3 R of backfill material is allowed by San Joaquin County Well Standards. For an site wells, LLNL requires 5 R of backfill to prevetV potential damage to equipment during potential future operations in Me red. Ifthe well location is in a paved or asphalt area Me well box will bo removed and the area below grade will he filled with clean aggregate and concrete, and the surface will be howeled smooth. If the well location es in an unpaved area, soil will be used as backfill following removal of the well box, if present.