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

Remedial Action Completion Report
June 2008
Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4)
Page 3-2
operations commence. The preconstruction survey included photographs and video footage of
the preconstruction site conditions.
3.1.4 Pre-Construction Meeting
Prior to commencing activities at RVAAP, Shaw conducted a pre-construction meeting that
included members of USACE, Ohio EPA, OHARNG, RVAAP and the Shaw project team.
Personnel from PIKA, the BRACD demolition contractor at LLs 2-4, were also in attendance in
order to provide effective coordination between the PIKA demolition and debris removal
activities and Shaw’s intended remediation activities. The pre-construction meeting
communicated client and contractual expectations to the project team, established internal
expectations, defined and communicated all project requirements, and ensured that the
project/team members understood their individual roles and responsibilities. Throughout the
duration of construction activities, the Shaw field superintendent participated in the RVAAP
weekly coordination meetings that were typically held on Mondays.
3.2 BASELINE GROUNDWATER SAMPLING
Shaw performed baseline groundwater sampling from 17 selected existing monitoring well
locations at LLs 1-4 to ensure the remedial activities did not further impact groundwater and to
determine pre-remedial conditions. The selected monitoring well locations were agreed upon
between USACE and the Ohio EPA and were primarily chosen due to the locations of the wells
in proximity and hydraulically down gradient to the Shaw excavation areas. The monitoring
wells chosen for the baseline groundwater sample event included the following:
• Load Line 1: LL1mw067, -078, -081, -082, -084, -085;
• Load Line 2: LL2mw262, -263, -266, -267, -269;
• Load Line 3: LL3mw236, -238, -239; and
• Load Line 4: LL4mw196, -197, -198
Further details regarding the monitoring well locations and selection rationale are presented in
the RAWP (Shaw 2007b). Groundwater sampling activities were performed in accordance with
the requirements of the Facility-wide Sampling and Analysis Plan (FSAP) (SAIC 2001), the
FWGWMP Plan (USACE 2004), and the Shaw Field Sampling Plan (FSP) (Shaw 2006b).
3.2.1 Well Redevelopment
Some of the baseline well locations are not currently included in the FWGWMP and had not
been sampled for several years prior to the baseline sampling event. This resulted in some of
these wells requiring redevelopment due to excess sediment in the well columns. Prior to
sampling, Shaw measured the depth of sediment thickness at each well. If greater than 10% of
the screen interval was measured as silted (i.e., greater than one foot of sediment thickness for a
10-foot screen interval) then the well was redeveloped. Monitoring wells requiring
redevelopment were completed as required using a low-flow peristaltic pump as described in
Section 4.3.2.3.11.1 in the FSAP (SAIC 2001).
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