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(6)Bedrock refusal must be distinguished from boulder refusal by a minimum of ten feet of continuous rock core. Where core lithology does not conform to known bedrock characteristics, a longer core may be required to confirm bedrock refusal.

(7)Core samples must be securely stored and accessible throughout the life of the facility.

(8)Unconsolidated samples must be retained for five years after the original permit is issued. The location of the storage area must be designated in the operating record for the solid waste facility.

C.Well and piezometer development. Monitoring wells and piezometers must be constructed, installed and developed in a manner which assures that the well or piezometer is in good hydraulic contact with the hydrogeologic unit and that samples obtained will be representative of formation water. Wells installed for the purpose of ground water sampling and analysis must be capable of producing samples low in turbidity.

(1)All wells and piezometers must be developed as soon as possible after installation but not before the well seal and grout have set.

(2)Water must not be introduced into the well except with approval from the Department.

(3)Any contaminated water withdrawn during development must be properly managed.

(4)The entire saturated screened interval must be developed.

(5)Well development methods selected must insure that sediment-free water can be obtained. The Department may require multiple attempts at well development to ensure that sediment-free water can be obtained.

(6)Acceptable well development methods are specified in US EPA (1992A) “RCRA Ground-Water Monitoring: Draft Technical Guidance”, and references listed therein. The development method selected must be appropriate for the stratigraphy/conditions encountered. Placement of screens in fine grained strata may require gentle development techniques to avoid pulling sediments into the well. The selected method must minimize to the greatest extent possible the amount of turbidity in the well.

D.In-situ hydraulic conductivity testing and well performance evaluation. In-situ hydraulic conductivity testing of each monitoring well must be performed to provide information on the hydraulic conductivity in the immediate vicinity of the monitoring well. A well performance evaluation must be performed on each monitoring well to determine the rate at which each well can be pumped without significant continued drawdown. In-situ hydraulic conductivity testing must be done in all monitoring wells and piezometers. The testing methods must not introduce contaminants into the well. Any contaminated water removed from the well must be properly managed.

E.Report on the Design, Construction and Development of Monitoring Wells and Piezometers. The following information on the design, construction and development of monitoring wells and piezometers must be submitted to the Department after development of monitoring wells is completed.

(1)Standard drillers logs showing driller's name, start and finish data, boring designation, casing, sampler, core barrel and hammer specifications, sample blow counts, vane readings, moisture content, location of the water table during drilling, water lost during drilling, degree of sample recovery and other appropriate information must be submitted for each boring.

Chapter 405: Water Quality Monitoring, Leachate Monitoring, and Waste Characterization

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