NCS000087 DMR SW (Ltr)

May 31st, 2016
Division of Water Quality )
Attn: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Division of Water Quality Representative:
I represent the Sanford, NC Pentair facility. Our recent Stormwater testing TSS results for two outfalls(A
and C) exceeded the benchmark amounts of our old permit. We are adhering to the old permit until a
new one is received.
In order to correct this issue we have determined the likely causes of the TSS exceedance.
1. The likely cause of the TSS exceedance for outfall A is erosion of a nearby embankment.
2. The likely cause of the TSS exceedance for outfall C is recently removed old racks that
have been staged out back of docks& may be contributing rust to the run-off.
We will correct these two conditions by: mitigating the erosion using rip rap or other similar measures,
and by removing and/or containing all staged racks from Stormwater exposure.
Pentair Sanford will re-submit Stormwater testing results within 6 months to confirm mitigation of the
TSS exceedance above benchmark values for both outfall A and C.
Regards,
Megan Garner
EC E1VED
EHS Supervisor—Pentair Sanford
JUN 1 0 ttio
CENTRAL FILLS
DWR SECTION
L,•*' ar'.'n
Director of Operations—Pentair Sanford