Final Remedial Action Completion Report for the ... - Rvaap.org

Remedial Action Completion Report
June 2008
3.2.2 Field Measurements
Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4)
Page 3-3
Groundwater field measurements, collected as part of Shaw’s groundwater sampling activities,
included determination of static water level, pH, conductivity, dissolved oxygen concentrations,
and temperature in accordance with Section 4.3.3 in the FSAP (SAIC 2001). Shaw utilized a
combination meter designed to measure the aforementioned parameters. Initial head space
readings were collected at each well location utilizing a photo-ionization detector unit. The
collection of field measurements complied with the performance requirements as specified in
Table 4-3 of the FSAP (SAIC 2001). The field measurement data collected as part of the Shaw
baseline groundwater sample event was inadvertently lost during demobilization activities in
January 2008 and was not available for inclusion in this RACR. Although, unable to include in
the report, the field measurement data was collected in accordance with Section 3.2.2 and
indicated that the integrity of the collected groundwater samples were not compromised. Field
screening data met the allowable criteria for sampling protocols applicable to the site.
3.2.3 Purging Methods
Monitoring well purging and groundwater sampling was conducted using conventional well
purging with a low-flow peristaltic pump as described in Section 4.3.4 in the FSAP (SAIC 2001).
Purging continued until pH, conductivity, dissolved oxygen, and temperature reached
equilibrium. Equilibrium was established by three consecutive readings, where one well casing
volume was purged between each reading. Purging was terminated before establishment of
equilibrium if one of the following conditions was met: (1) five well volumes had been removed;
or (2) the well was purged to dryness.
In several instances, a well was purged to dryness and sampling was delayed for a time period of
up to 24 hours to allow for recharge. During the delay period, the atmosphere of the well was
isolated to the greatest extent possible from the surface atmosphere. Upon sufficient recharge of
groundwater into the well, a sample was collected without additional well purging.
In order to minimize the quantity of investigation-derived waste (IDW) liquids generated due to
the well purging activities, wells were micro-purged in accordance with Ohio EPA technical
guidance (Ohio EPA 1995). All development and purge groundwater was containerized and
managed as IDW liquid wastes. Disposal of this liquid waste is discussed in Section 4.0.
3.2.4 Sample Collection
Groundwater sampling at a monitoring well location commenced immediately after purging was
completed unless the well was purged to dry conditions as discussed in Section 3.2.3.
Groundwater sampling activities were performed in accordance with Sections 4.3.5 and 4.3.6 of
the FSAP (SAIC 2001). Groundwater samples were collected for analysis of the full suite of
COCs including target compound list (TCL) volatile organic compounds (VOCs), TCL SVOCs,
TCL pesticides, PCBs, explosives, propellants (nitroglycerine, nitro-guanidine, and
nitro-cellulose) and filtered target analyte list (TAL) metals. Further details regarding
groundwater sampling and analytical requirements are presented in the RAWP (Shaw 2007b).
Bottles designated for VOC analysis were filled first and in a manner so than no headspace
remained. Immediately after collection of each sample and completion of bottle label
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