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(i)Blanks and Duplicates. Unless otherwise approved by the Department based on site-specific characteristics, the following schedule for the collection and analysis of blanks and duplicates must be followed:

a.one trip blank per cooler or shipping container for VOCs each time VOCs are taken to the lab.

b.one equipment blank (final rinsate blank) per sampling event. For each piece of non-dedicated sampling equipment used, the equipment blank must be taken at the end of the sample event.

c.one duplicate for every tenth sample obtained over the course of consecutive sampling events. The duplicate sample identification must be coded such that its origin is unknown to the laboratory.

(ii)continuous chain of custody documentation must be maintained for each sample. Sample containers, preservation methods and maximum holding times must be appropriate for each parameter and method involved in the monitoring program, and must be specified in the sampling and analytical work plan for the facility.

(iii)the analytical methods used to analyze samples must be chosen in accordance with State or Federal guidance documents. Analytical methods used must, where possible, have detection limits which do not exceed one half the maximum contaminant level (MCL) or the maximum exposure guideline (MEG) for each respective parameter.

(3)Additional Standards for the Sampling of Water Supply Wells. When the sampling of water supply wells is conducted, documentation of the well location, design and sampling procedures must be provided.

(a)Location and construction records for the wells.

(i)a description of each well, including its installation, history, and treatment must be provided to the Department. A template for a “Well Description" is contained in Appendix 405.B.

(ii)a map, identifying the location of the disposal facility, and of all water supply wells sampled.

(b)Sampling procedures for the wells.

(i)samples should be collected directly from the well, where possible. Otherwise, samples must be collected as near to the well as possible and before the water is softened, filtered or heated.

(ii)if possible, samples must be collected before the water enters the pressure tank; otherwise the water must be run long enough to flush water stored in the tank and pipes.

(iii)if samples are collected from a tap, aerators, filters or other devices must be removed before sampling.

B.Standards for Surface Water Monitoring. The objective of a surface water quality monitoring program is to detect direct or indirect discharges to a classified body of water, or to detect improvements in surface water quality. Information gathered during hydrogeologic investigations, preparation of an application and ongoing monitoring of a facility must be considered in locating surface water monitoring points.

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

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