NCD980602163_19910923_Warren County PCB Landfill_SERB C_Memo from Jack Butler to Mike Kelly re cap integrity-OCR

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23 September 1991 _..,.,.-.
TO: Mike Kelly
FROM: Jack Butler
SUBJECT: Warren County PCB Landfill
As we discussed during our meeting on the subject site on 9 September 1991, one
method of determining the present integrity of the cap at the s'ite involves removal of water
presently in the cell. Since this dewatering of the cell could lead to settling, which could
effect cap integrity, it is important to measure and document any vertical movement of the
cap during and after dewatering. To monitor cap movement it is suggested that the concrete
pads associated with the old sprinkler system be surveyed with reference to the concrete
pads at monitoring wells 1 and 2 along the long sides of the landfill. Two reference points
were chosen as a check to ensure that any detected movement is associated with cap
movement instead of reference point movement. The concrete pads associated with the old
sprinkler system were chosen as measurement points because they were poured in place
over ten years ago and, therefore, should be representative of the caps surface, and because
they represent several data points which will better describe the position of the cap than a
single measurement point. ;
This proposal has been discussed with Harvey Allen, North Carolina Superfund
Section, who is a North Carolina registered surveyor. Mr. Allen has volunteered to assist
in this surveying. The North Carolina Superfund Section can provide all necessary surveying
equipment, with the exception of a level, which Mr. Allen has volunteered to supply. It is
recommended that the site be surveyed at least once prior to dewate_ring and several times
(monthly initially for several months, and bimonthly or quarterly thereafter) during and after
dewatering.
JB/dk/1
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./ 7
l . Entrance Road
2. Monitoring Wells
Casings, locks
.) .
· Fences, gates, locks
Landfill fence, gate, locks
Air Vent
). Landfill Cover
6.
Erosion, vegetation
Subsidence
Leachate Detection System
Water in sump
7. Leachate Collection System
Access Pipe
Pump
Piping
8 . Treatment Works
Influent Piping
Sand Filter
Carbon Filter
Effluent Piping
Surface Impoundment
Erosion, vegetation
10 . I rrigation Syst~
Influent Piping
Pump
Sprinkler Units
NO POTENTIAL
PROBLEM PROBLEM
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OBSERVATIONS
.: PC.3 LANDFILL MONTHLY REPORT (CONT.
iJATE_-___ Cj_-~//_-__._9_,_/ ____ NAME .&b ~y Lu lft ;, tfa.-C/4., /]'-f /-/e,,-
: Pumping Data
Pumping -Times
Pm,ping Volume ___ t-l.;;..., ...:..lo...;" 9_t-', f'----1-.;l cx=··1:.....o.;..__,.8;::;;....;:;..'a ;..:./JL...1/~01...:.." ~s ___ _
Irrigatibn Data
Irr:Lia"t:.ing Times --
Irrigating Volume -------------------
September 9, 1991
Re: PCB Landfill in Warren County
Pumping Rate is about 7 to 8 gal/min
It takes about 15 to 20 minutes to pump the system dry
About 120 gallons are pumped per cycle
It takes about 2 hours and 45 minutes to recharge
Assume about 3 hours to pump and recharge for one cycle
Assume a constant rate of pumping and recharge
8 cycles of 3 hours per day
8 cycles X 120 gal/cycle= 960 gal/day
1,400,000 gal. / 960 gal/day= 1458 days= 4 years
assuming constant rate, 24 hrs/day, 365 days/yr
4 X 3 = 12 years, assuming constant rate, 8 hrs/day, 365 days/yr
12 / .68 = 17.6 years, assuming constant rate, 8 hrs/day, 250 days/yr
Assumes constant rate of recharge and pumping
Assumes no additional infiltration
Set up continuous pumping operation
1. slow rate of continuous pumping
2. cycled pumping at ~igher rate with float valve on/off switch
Someone needs to be on site to monitor pumping, sample leachate,
measure draw-down, etc.
Permit requires certified waste water treatment plant operator???
Operate by using existing staff or contract out the work
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STATE.LABORATORY OF PUBLIC HEALTI-1
DIVISION OF HEALTH SERVICES
N.C. DEPARTHENT OF HUMAtJ RESOURCES
P. 0. BOX 28047 -306 N. t·!ILMINGTOi-1 ST., RALEIGH 2761.l
CHEMICAL ANALYSES -SOLID AND HAZARDOUS WASTE
Source:. Pr TT P }-n i ~;. _+ Remarks:
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County: &,.-1,-0 l""' '
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Report To:
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Address:
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Telephone Number: ( ) -.
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Collected By:
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Date Collected: Time PN
Location of Sampling Point:
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} Extractable Metals Results expressed in ppLB unless
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~otal Metals Results indicated. Result I
Arsenic ,). r!J_ Solids, dissolved
Barium -~ 90 Solids, suspended
Cadmium .;J. I 1 Solids, total .
Chloride Solids, total volatile
Chromium L./ LJ , Spec. Conductivity
Color Zinc
Copper F.nrfrin
Flammability Lindane
Fluoride Methoxvchlor
Iron Toxaohene
T o,:,rl 7'1 2.4-D
M;:moanese 2.4.5-TP ' Mercury o. oy s
Nitrate
c;:;11 i \ pH ~ n,r
Selenium ~, 7
Silver l. 'I
Date Received / tf/4, ti g .:/
C:
Date Reported Reported By ----------------
Laboratory Nuober 07921
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