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ARCHIVED REPORTS XR0006486
Environmental Health - Public
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2900 - Site Mitigation Program
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PR0519189
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ARCHIVED REPORTS XR0006486
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Last modified
8/21/2019 4:55:08 PM
Creation date
8/21/2019 2:57:39 PM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0006486
RECORD_ID
PR0519189
PE
2950
FACILITY_ID
FA0014347
FACILITY_NAME
CURRENTLY VACANT
STREET_NUMBER
6425
STREET_NAME
PACIFIC
STREET_TYPE
AVE
City
STOCKTON
Zip
95207
APN
09741031
CURRENT_STATUS
02
SITE_LOCATION
6425 PACIFIC AVE
P_LOCATION
01
QC Status
Approved
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ON SITE ANALYSIS <br /> In addition to the bag samples collected for the WEGE laboratory <br /> samples may be run on site using a Photovac 10S50 PID <br /> chromatograph. <br /> The influent and effluent samples are collected from the same <br /> ports as the bag samples but 60 cc syringes are used to collect <br /> the sample and 0 .5 cc of the vapor sample are then injected <br /> f directly into the PID chromatograph. The resulting chromatogram <br /> is then compared to a standard calibration run on the same <br /> chromatograph prior to the sample run. <br /> i <br /> During the initial month of operation, three effluent samples were <br /> obtained during the day and analyzed using the lOS50 <br /> f chromatograph . The highest value is used to calculate the VOC <br /> f poundage per day produced. Presently, an influent and an effluent <br /> sample are obtained upon arrival to the site . Adjustments are <br /> then made to the vapor extraction system: removal of liquids from <br /> the condensation traps ; closing the air dilute valve to maximize <br /> vapor removal , without causing the REMOX Unit to shut down due to <br /> high temperature shut off (greater than 1550-F) ; and closing the <br /> pump bypass to create maximum flow and vacuum from the wells . <br /> Once, these adjustments have been completed and the system has <br /> stabilized, .influent and effluent samples are again obtained, <br /> along with samples form the individual extraction orifices <br />• (wells ) . The site is then secured until the next visit . <br /> FLOW RATES <br /> Flow rates are measured at the site by use of orifice plates . <br /> A one inch orifice is placed in line for each well and a three <br /> inch orifice is used to measure the total flow. <br /> An orifice plate restricts the flow of air across it . This <br /> restriction causes a pressure drop across the orifice. By <br /> measuring the resulting pressure change across the orifice it is <br /> possible to calculate the air flow rate . (see Appendix A , orifice <br /> Flow Calculation) <br /> The orifice plates used to determine the flow rate are the square <br /> edged type C--0 . 65 . <br /> WEGE has 'developed a table for calculating the flow across an <br /> nr4f"re _f ------ Si�e� Ig�e Appeaadix M, iivw RtC Tablc) . <br /> CALCULATIONS <br /> To calculate the pounds ( lb) per day the concentration is <br /> multiplied by the volume of air produced in one day . <br /> 5 <br />
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