SITE INFORMATION AND CORRESPONDENCE

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obtained during accelerated sampling efforts under 420425(b),and(3)all appropriate water quality data from before WDRs were issued — in lieu of the one-year monitoring program under&(g)(7)(A). (C) Background water quality of ground water shall be based on sampling of wells that are not upgradient from the Unit only where: 1. hydrogeologic conditions do not allow the determination of the upgradient direction;or 2. sampling at other wells will provide a representative indication of background water quality. (D) In developing the data base used to determine a background value for each indicator parameter or waste constituent in ground water,the discharger shall take a minimum of one sample from each well used to determine background.A minimum of four samples shall be taken from the entire system used to determine background water quality,each time the system is sampled. In a case where there is only one background well,the four measurements per quarter shall be obtained by taking four independent samples,pursuant to 120415(e)(12)(B),and conducting separate analyses for each such sample. (h) Land and Water Use. (1) Well Map—A map showing the locations of all water wells,oil wells,and geothermal wells within the facility boundary and showing the locations of all such wells within one mile outside of the facility boundary. (2) Well Owner—Name and address of the owner of each well indicated in&(h)(1). (3) Well Information—Well information,where available,for each water well indicated in&(h)(1)including, but not limited to: (A) total depth of well; (B) diameter of casing at ground surface and at total depth; (C) type of well construction(cable tool,rotary,etc.); (D) depth and type of perforations; (E) name and address of well driller; (F) year of well construction; (G) use of well(agricultural, domestic, stock watering, etc.); (H) depth and type of seals; (1) lithologic,geophysical,and other types of well logs,if available; and (J) water levels,pump tests,water quality,and other well data, if available. (4) Land Use—Current land use within one mile of the perimeter of the Unit, including: (A) types of land use (e.g., residential, commercial, industrial, agricultural, recreational, etc.); (B) types of crops; (C) types of livestock;and (D) number and location of dwelling units. (5) G.W.Use—Current and estimated future use of ground water within one mile of the facility perimeter. (i) Preliminary Closure Plan—For any proposed Unit(including a proposed lateral expansion of a Unit's RWQCB-Permitted Area)and for any Unit not yet required to undergo final closure,the ROWD shall contain a preliminary closure and post-closure maintenance plan,under 421769,containing a generalized cost estimate for closure costs and for annualized post-closure costs,supported by sufficient detail to validate the plausibility of the estimate.For any Unit(or portion thereof,in the case of a landfill undergoing complete final closure of a portion of the Unit)that is closing(or that is required to close),the ROWD shall be amended to contain a final closure plan, under 421769, containing sufficient detail for the RWQCB to validate that the closed Unit will meet all applicable