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1 Weak Plan In the 0acomnawlmlrg at LLNL Site 300 Wells. Page Work Plan for the Decommissioning of LLNL Site 300 Wells This work plan describes the procedures to he followed for the decommissioning of fourteen LLNL Site 300 monitor wells. The decommissioning is scheduled to begin in August The project and cask numbers forthiswork arc 32578481925. Has fimmecn wells proposed far decommissioning include: • Three off-site wells located on California Fish and Wildlife Property: W-25D-01, -02; W-2514-01 (Figure 1) • Nine uff-site wells located we Union Livestock, Inc. (Connolly) property: W-25M-02, -03; W-25N-05, -06, -15, -I8, -25, -26, -28 (Figure 2) • One aRsim well located on Fireworks and Sege FX property: W-24P-03 (Figure 3) • One on site wall located at Site 300 in the Under(ienecal Services Ana: W-26R-0I (Figure 4). The primary criteria cunendy being used to determine whether wells at the LLNI. Site 300 the potential candidates fur well decommissioning are listed below. If a well has one Of room of these characteristics, cannot lac used for making groundwater elevation contour andlor ismxmnecWmtion communal and nolongerserves a practical purpose at LLNL Site 300, it may be considered obsolete. Bmause such wells could potentially pare a Wrest to ter quality as vertical conduits for coumminam s to reach the subsurface. ERD has determined that it is beaten decormmussion these wells wfunds bccomeavailable, muter Wan leaving them in an unused state. Primate used by ERD far determining whether a montw well may be a candidate for well decommissioning include: Wells having either a damaged annular seal, using or well semen, a stuck pump a faulrycompledon that cannot be repaired and potentially compromises the imep{ity a analytical samples or seater levels assured from these wells (such wells may also lead to crmscanmmiation anchor may create conduits for commmiam n); 2. Wells that aye screened across room than one hydmsntigmphic unit (HSU) containing annual permeable units ts or wells that an screened across multiple HSUs, one a which is unwanted but contains perched groundwater wars that said comumse seater as the well. Data prom wells in this category canna be used for individual HSU groundwater elevation maps or otoconcentntion commr maps. Such wells may also act as conduits for contaminants to animate fears one HSU to another. Groundwater cetmctiou wells scnrnW across more than one HSU that an being actively pumped the not fall into this category since the potential for race commustration is exameady unlikely under these conditions; 3. Wells hat were never designed to collect groundwater level data m aalytical data from soil vapor or water and have reached W e end of tit a r servi ce life or are no larger being used far the project Ivey wen designed and completed for;