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(2)A well installation detail diagram with a minimum vertical scale of 1 inch equals 5 feet showing the complete borehole and the complete well or piezometer installation in cross section, including well or piezometer designation; the elevations of riser and screen and of all annular materials; the surface elevation and the of top of riser and top of protective casing. Sampling intervals, sample designations, and if practical, analytical results must also be included. Borehole stratigraphy, as interpreted by the geologist in charge of the installation is also required as part of the installation diagram. Logs of surficial deposits should include a description of matrix and clasts, mineralogy, roundness, color, odor, appearance, and behavior of materials. Rock core logs must describe the lithology, mineralogy, degree of cementation, color, grain size, and any other physical characteristics of the rock noted, percent recovery and the rock quality designation (RQD). The logging system used to provide the information must be a geological logging system. Engineering logging systems are not acceptable.

(3)Information on the method of well development used for each monitoring well and the results of the development.

F.Routine Inspection, Maintenance and Testing of Monitoring Wells. All monitoring wells must be maintained in a manner that ensures their continued performance according to design specifications over the life of the monitoring program. All results, as well as a description of any maintenance conducted, must be included in the reports submitted to the Department.

(1)Inspections of surface seals for heaving, settling and cracks must occur each time sampling and/or water elevation measurements are carried out, and the results recorded on the field sheets.

(2)At least annually, the depth of each well must be determined, and the results reported in the annual report.

(3)At each monitoring well where low-flow sampling is not used, a performance evaluation of the monitoring well must be conducted at least annually, to determine the pumping rate at which the well will be purged and sampled. This data must be included in the annual report for the facility.

G.Replacement of wells and piezometers. All wells and piezometers must be properly protected and maintained to insure their integrity. If water quality or any other data show that the integrity of a monitoring well is lost, the well must be replaced and sampled within a time period not exceeding 120 days after written notification by the Department. When a well is damaged or for any other reason cannot be sampled, the Department must be notified in writing no later than fifteen days from the discovery of the damage.

(1)A location for the replacement well or piezometer must be approved by the Department prior to its installation.

(2)The initial sample for a replacement well at MSW landfills must consist of the Appendix 405.A, Column 3 parameters.

H.Abandonment of wells, piezometers and borings. Wells, piezometers and borings abandoned for any reason must be fully and completely sealed in a manner appropriate to the geologic conditions to prevent migration of water or contaminants along the borehole. Generally such sealing must include:

(1)Removal of all material installed in the original borehole including casing, screen and annular materials to the greatest extent possible. Any casing which cannot be withdrawn intact must be ripped and perforated and then augered or washed from the hole.

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

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