BNA04158839 - DTSC-SSFL
SCREENING SOIL FOR VOLATILE ORGANIC CONTENT
B/886 FOR MER SODIUM DISPOSAL FACILIT Y
USE OF THE HNU MODEL PI-10 1
In an effort to reduce the amount of hazardous waste generated during the closure of the
B/886 former Sodium Disposal Facility, screening of the soil with an organic vapor
monitor is to be performed. Based on the results of this screening and other visual
indicators of contamination, a determination will be made as to whether the soil will be
considered hazardous or non-hazardous for purposes of segregation . The following is the
procedure to be used for performing the screen, for volatile organic compounds,
maintaining and calibrating the monitoring equipment and documenting the results of these
Equipment & Calibration
The HNU Model PI-101 is a photoionization detector which uses an ultraviolet lamp of
10 .2 eV to ionize volatile organic compounds . The amount of the compound in air is read
directly from the dial on the front of the HNU in parts per million (ppm) . The compound
of interest, for purposes of soil screening during the remediation activities at this site, is
trichloroethylene . The instrument is to be calibrated twice daily, before the morning shift,
and before the afternoon shift, using the following simplified procedure :
1 . Turn the dial selector on the HNU to "Standby" and use the "Zero" control to adjust the
dial needle to read zero.
2 . Turn the dial selector to "Batt " an d confirm that the needle is within the green range . If
it is not, notify the Facility Manager or Crew Chief and re turn the HNU to the battery
charge mode .
3 . Connect the HNU to the regulator and cylinder with a short piece of tubing as shown in
Figure 1 .
4 . Open the regulator valve on the cylinder all the way, then turn the dial on the HNU to
the 0-200 scale .
5. Turn the SPAN control knob until the reading on the dial is 79 ppm .
6. Once the 79 ppm reading is obtained , lock the SPAN control with the small black
switch on the side of the cont rol.
7. Record the calibration information in the HNU Calibration Log Book. Calibration
The instrument shall be placed in the battery charge mode at the end of the shift for 8-10
hours between use . To charge the battery, first insert the mini phone plug of the charger
into the jack on the left side of the HNU . Then insert the charger plug into the outlet and
turn the function switch to the "Batt" position . The needle should deflect full scale to
indicate that the unit is charging . The instrument should be turned off, and the probe
should remain attached during recharging .
Any difficulties in cali brating the unit or apparent malfunctions in its operation shall be
reported immediately to the Facility Manager or the Crew Chief .
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Procedure For Monitorin g
The screening of soil in the backhoe, container, excavation or any are a designated by the
Facility Manger or Crew Chief shall be performed by the following :
1 . Turn the cont rol dial to "Batt" and confirm that the needle is within the green r an ge . If it
is not, notify the Facility Manager or Crew Chief an d re turn the HNU to the battery charge
2 . Turn the dial selector to the 0-2000 ppm range and look for dial movement . If there is
none, turn the dial selector to the next most sensitive range, 0-200 ppm, and look for
movement. If still no movement, turn the dial selector to 0-20 ppm, which is the most
sensitive scale, and read the dial . The purpose of moving the selector from the least
sensitive to the most sensitive scale is to prevent damaging the unit with an off-scale
3 . If the dial reading goes off scale at any time, move the dial selector to a less sensitive
range and read .
4 . Scan the soil selected for screening by holding the probe approximately 3 inches from
the surface. Slowly move the probe across the surface at this range and cover the entire
surface . Avoid contact of the probe with the soil, as soil in the probe will cause faulty
5 . Read the concentration in ppm of trichloroethylene in the air above the soil directly from
the dial on the HNU . If a concentration which meets or exceeds 25 ppm is read, contact
the Facility Manager or Crew Chief immediately . This soil will be considered to be
hazardous and will need to be managed as specified in 886-SP-0002 . Provide information
to these persons regarding the concentration present and the location of the monitoring .
Additional questions regarding the calibration, maintenance or use may be answered by
calling Bonnie Burn s , Environmental Protection at extension 5325, Plummer. The
manufacturers instruction manual shall also be available on-site for consultation in the event
CALIBRATION CHECKING SET-UP
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