Draft Phase 1A SAP Attachment 14C-2 US Magnesium NPL Site Section D: Sampling and Analysis Revision 0 August 2013 Document Tracking Number: 14C-2-24 RECORD OF UFPQAPP-SAP MODIFICATION INSTRUCTIONS: This form is required anytime a modification is being made to any worksheets or sections for any portion of the Phase I A SAP, including attachments, tables, figures, and/or SOPs. Requestor: Ken Wangerud Title: EPA RPM Name of Site/Field Event: Phase I A Surface Water Sampling Date of Proposed Modification: 21April2015 Modified SAP Section(s): Worksheet #14, Table 14-1, Figure 14-14, and other sections as required for total sample counts (Table 18-1 and Table 20-1 ). Describe the Modification: US Magnesium/ERM is to promptly collect samples of surface water currently present in the former wastewater diversion ditch and the (newly-identified) Star Pond overflow ditch within PRl-5, and also the Skull Valley Diversion ditch pursuant to the attached Figure 14-14 (modified from the Phase IA SAP) and consistent with the requirements of the Phase IA SAP. As with the Ph IA surface water samples remaining to be collected, these samples are to be collected as soon as possible while water is present. The additional surface water sample collection locations are listed in the following table consistent with Table 14-1 of the Phase I A SAP: Sample Sample PRI Figure Northing Location Media Area Number 2 Easting 2 Rationale ID I To collect a sample of the water in the former Surface wastewater diversion ditch to identify any PRl5-017 Water 5 14-14 4530990 354959 chemistry unique to the ditch matrix. Sample to be collected at the northern extent of standing water in the ditch. To collect a sample of the water in the Star Pond overflow ditch to identify any chemistry unique to the ditch matrix. Sample to be PRl5-018 Surface 5 14-14 4530710 355136 collected at or just east of the southern "T" Water terminus of the Star Pond overflow ditch if there is water present, otherwise the nearest point at or from the southern end of the ditch where water is present. To collect a sample of the water in the Skull Valley Diversion ditch/canal where wastewater from PRl-5 and/or ditch flows PRI5-019 Surface 5 14-14 4530760 355491 appears to have seeped into the ditch/canal to Water evaluate potential impact to Skull Valley Diversion flows. Sample to be collected at the downstream (east) end of the predominant wastewater seep. Page I of 3
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Draft Phase 1A SAP Attachment 14C-2
US Magnesium NPL Site
Section D: Sampling and Analysis Revision 0
August 2013
Document Tracking Number: 14C-2-24
RECORD OF UFPQAPP-SAP MODIFICATION
INSTRUCTIONS: This form is required anytime a modification is being made to any worksheets or sections for any portion of the Phase I A SAP, including attachments, tables, figures, and/or SOPs.
Requestor: Ken Wangerud
Title: EPA RPM
Name of Site/Field Event: Phase I A Surface Water Sampling
Date of Proposed Modification: 21April2015
Modified SAP Section(s): Worksheet #14, Table 14-1, Figure 14-14, and other sections as required for total sample counts (Table 18-1 and Table 20-1 ).
Describe the Modification: US Magnesium/ERM is to promptly collect samples of surface water currently present in the former wastewater diversion ditch and the (newly-identified) Star Pond overflow ditch within PRl-5, and also the Skull Valley Diversion ditch pursuant to the attached Figure 14-14 (modified from the Phase IA SAP) and consistent with the requirements of the Phase IA SAP. As with the Ph IA surface water samples remaining to be collected, these samples are to be collected as soon as possible while water is present. The additional surface water sample collection locations are listed in the following table consistent with Table 14-1 of the Phase I A SAP:
Sample Sample
PRI Figure Northing
Location Media
Area Number 2 Easting2 Rationale
ID I
To collect a sample of the water in the former
Surface wastewater diversion ditch to identify any PRl5-017
Water 5 14-14 4530990 354959 chemistry unique to the ditch matrix. Sample
to be collected at the northern extent of standing water in the ditch.
To collect a sample of the water in the Star Pond overflow ditch to identify any chemistry unique to the ditch matrix. Sample to be
PRl5-018 Surface
5 14-14 4530710 355136 collected at or just east of the southern "T"
Water terminus of the Star Pond overflow ditch if there is water present, otherwise the nearest point at or from the southern end of the ditch where water is present.
To collect a sample of the water in the Skull Valley Diversion ditch/canal where wastewater from PRl-5 and/or ditch flows
PRI5-019 Surface
5 14-14 4530760 355491 appears to have seeped into the ditch/canal to
Water evaluate potential impact to Skull Valley Diversion flows. Sample to be collected at the downstream (east) end of the predominant wastewater seep.
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Draft Phase 1A SAP Attachment 14C-2
US Magnesium NPL Site
Sample Sample
PRI Location
Media Area
ID I
Surface PRI7-018
Water 7
PRil3- Surface 015 Water
13
Figure Northing Number 2 Easting2
14-14 4531130 356945
14-14 4533090 356578
Section D: Sampling and Analysis Revision 0
August 2013
Rationale
To collect a sample of the water in the Skull Valley Diversion ditch downstream of the wastewater seepage to evaluate potential impact to Skull Valley Diversion. Sample to be collected in the southeast comer of PR!-7 immediately upstream (west) of the Skull Creek road-crossing culvert.
To collect a sample of the water in the Skull Valley Diversion ditch downstream of the wastewater seepage to evaluate potential impact to Skull Valley Diversion. Sample to be collected from immediately upstream (south) of the footbridge crossing located east of the northeast comer of PR!-7.
1 - The PRI Area li sted is where the sample is located; all surface water samples are part of PRI Area 17, Site-Wide Water. 2 - Northings and Eastings are based on UTM Zone I 2N, NAD83, meters. Sample location coordinates are considered draft; final
coordinates will be provided following sample collection.
Justification or Reason for the Modification: During the course of ERM site investigations for PRI-2 (Landfill) under the Ph I A SAP (Sept. 2013), and during further investigation scoping/planning for Ph l A-B Inner PRI investigations in PRI-5, the EPA and ERM have identified previously un-sampled surface water conveyance ditches. During a joint EPA-ERM site-review of these ditches on April 16, 2015, EPA observed extensive indications and presence of wastewater seepage into the Skull Valley Diversion ditch/canal (see Figures 1 and 2).
Figure 1. View west of Skull Valley Diversion ditch/canal showing heavy iron-staining (EPA April 16, 2015)
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Draft Phase 1A SAP Attachment 14C-2
US Magnesium NPL Site
Section D: Sampling and Analysis Revision 0
August 2013
Figure 2. View from road on S-edge of Skull Valley Diversion into canal and toward PRJ-5. Seep waters within Skull Valley Diversion in foreground with new earthen bank placed along N-edge of channel. Dark gray area to N is a previously flooded wastewater zone between the Skull Valley Diversion canal and the Former Diversion Ditch channel (visible in background with PRl-5 lagoon beyond) (EPA April 16, 2015).
This modification will obtain samples to identify CO PCs that may be present within the PRI-5 ditches and the Skull Valley Diversion ditch/canal.
EPA Review/Approval: _0~r-----~ Date:EWZrJ/S-~ ~
Each approved UFPQAPP-SAP Modification Form will become part of Attachment 178 in the Phase I A Final SAP and also incorporated into the appropriate RI Results Report. A copy is to be provided to all recipients identified on SAP Worksheet #3.
