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Measurement of pH, conductivity, dissolved oxygen (DO), turbidity, temperature, and oxidation-reduction
potential (ORP) will be obtained at least three times (beginning, middle, and end) during the well purging
process. These parameters will be allowed to stabilize before sample collection begins. If the well is
purged dry, samples will be collected upon sufficient recharge. Groundwater samples will be collected
from each monitoring well using dedicated disposable polyethylene bailers. Bailers will be lowered slowly
into the wells to avoid agitating the water.
Following water level gauging of the C-zone monitoring wells, each well will be sampled following lowflow
sampling procedures as described in SOP 3b (Appendix C). During sampling, the low-flow sampling
pump intake will be lowered to the corresponding depth measured in each well in order to collect the
sample directly from the bedding plane fracture (515 feet AMSL). Measurements of pH, conductivity, DO,
turbidity, temperature, and ORP will be recorded every 3 to 5 minutes, or until parameters stabilize,
during purging activities to ensure that representative groundwater quality samples are collected.
Groundwater samples collected from each monitoring well will be submitted to a New York State certified
laboratory for analysis of VOCs using U.S. Environmental Protection Agency Test Method 8260B. Quality
assurance/quality control (QA/QC) samples, including equipment blanks, trip blanks, and duplicates, will
be collected in accordance with SOPs (Appendix C). All samples will be sealed, labeled, and placed in a
cooler with ice for shipment to an offsite analytical laboratory. Appropriate chain-of-custody procedures
will be followed.
3.3.2 Quality Assurance/Quality Control Procedures and Analytical Results
QA/QC samples collected during each quarterly sampling event, including trip blanks, equipment blanks,
and field duplicates in accordance with SOPs. Trip blanks are samples used to identify possible sample
contamination originating from sample transport, shipping, or site conditions. Trip blanks will be labeled,
documented, and handled in the same manner as other field samples. Equipment blanks will be
collected and used as a QC check of the decontamination procedures for the low flow pump. The
equipment blanks will be collected by rinsing the cleaned equipment with analyte-free water, collecting
the rinsate in the appropriate sample containers, and submitting to the laboratory for analysis of the same
parameters as the groundwater samples. The equipment blanks will be labeled, documented, and
handled in the same manner as the other field samples. Field duplicate samples will be collected to
evaluate sample variability. One duplicate sample per 20 field samples will be collected per quarter.
All samples will be sealed, labeled, and placed in a cooler with ice for shipment to the laboratory.
Appropriate chain-of-custody procedures will be followed, and the laboratory data sheets with signed
chains-of-custody will be completed following each sampling event.
Before initiating field activities, field personnel will perform a reconnaissance of the work areas. A PID
will be used during the site walkover to assess hazards and determine background concentration of
organic vapors within the breathing zone.
3.4 REPORTING
The results of the quarterly monitoring program will be detailed in a semiannual progress summary report
and submitted to the NYSDEC. Each report will describe the quarterly groundwater sampling procedures
and sampling results from the previous 6 months. They will also detail the hydraulic response of the B-
and C-zones, and the distribution of affected groundwater. .
In addition to summarizing system related O&M items, the progress reports will include:
• sampling methods
• tables and graphs showing groundwater analytical results
• groundwater monitoring data log sheets
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