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<br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California January 11, 2002
<br />0 presented as Table 3.
<br />•
<br />Between November 26 and December 26, 2001, the GWE system discharged a total of
<br />1,121,066 gallons of treated groundwater over a period of 92 days (Table 4). As of
<br />December 26, 2001, the GWE system has treated a total of 4,412,067 gallons. Calculated
<br />discharge rates during the December monitoring period ranged from 5.72 to 8.83 gallons per
<br />minute (gpm).
<br />During the 4`' quarter the system extracted approximately 0.26 pounds of TPHg, 0.002
<br />pounds of benzene, and 1.38 pounds of MtBE. To date, the system has extracted
<br />approximately 7.37 pounds of TPHg, 0.153 pounds of benzene, and 81.62 pounds of MtBE.
<br />Plots of GWE system mass removal trends and influent groundwater TPHg, benzene, and
<br />MtBE concentrations versus time are shown on Figures 6 and 7, respectively.
<br />3.2 Soil Vapor Extraction System
<br />The Soil Vapor Extraction (SVE) system is comprised of four vapor wells (VE -1 through
<br />VE -4), connected by mechanical piping to a 5 horsepower (hp) positive -displacement blower,
<br />and a catalytic oxidizer. Vapors from the soil are removed under vacuum from the blower
<br />and petroleum hydrocarbons in these vapors are destroyed by a catalytic oxidizer, prior to
<br />discharging the air stream to the atmosphere. The operation of the SVE system is permitted
<br />by the San Joaquin Valley Air Pollution Control District (SJVAPCD).
<br />To assess effectiveness of the SVE, process samples were collected twice per month from the
<br />vapor stream before (INFL) and after (EFFL) the catalytic oxidizer. Each sample was
<br />analyzed for TPHg, BTEX, and MtBE. Maximum concentrations of detected constituents are
<br />presented below.
<br />1:1Chevron1957751Periodic Monitoring\Quarterly Progress Reportsl4thQuarter 200114th Quarter -2001 Progress Report.doc
<br />Maximum Con§titueiit`Concentriition'{µg/1)
<br />Sampling.Port
<br />•September-26-thtoug4 Dece'mber,26;`2601'.
<br />MtBE
<br />TBA
<br />EtBE
<br />TAME"
<br />Ethanol
<br />Methanol
<br />INFL
<br />190
<br />84
<br />11
<br />1.7
<br />13
<br /><850
<br />MID -1
<br /><0.50
<br /><5.0
<br /><0.50
<br /><0.50
<br />10
<br />120
<br />MID -2
<br /><0.50
<br /><5.0
<br /><0.50
<br /><0.50
<br />15
<br />210
<br />EFFL
<br /><0.50
<br /><5.0
<br /><0.50
<br /><0.50
<br />56
<br />150
<br />Explanations:
<br />< Indicates the constituent was not present at or above the method reporting limit shown
<br />Between November 26 and December 26, 2001, the GWE system discharged a total of
<br />1,121,066 gallons of treated groundwater over a period of 92 days (Table 4). As of
<br />December 26, 2001, the GWE system has treated a total of 4,412,067 gallons. Calculated
<br />discharge rates during the December monitoring period ranged from 5.72 to 8.83 gallons per
<br />minute (gpm).
<br />During the 4`' quarter the system extracted approximately 0.26 pounds of TPHg, 0.002
<br />pounds of benzene, and 1.38 pounds of MtBE. To date, the system has extracted
<br />approximately 7.37 pounds of TPHg, 0.153 pounds of benzene, and 81.62 pounds of MtBE.
<br />Plots of GWE system mass removal trends and influent groundwater TPHg, benzene, and
<br />MtBE concentrations versus time are shown on Figures 6 and 7, respectively.
<br />3.2 Soil Vapor Extraction System
<br />The Soil Vapor Extraction (SVE) system is comprised of four vapor wells (VE -1 through
<br />VE -4), connected by mechanical piping to a 5 horsepower (hp) positive -displacement blower,
<br />and a catalytic oxidizer. Vapors from the soil are removed under vacuum from the blower
<br />and petroleum hydrocarbons in these vapors are destroyed by a catalytic oxidizer, prior to
<br />discharging the air stream to the atmosphere. The operation of the SVE system is permitted
<br />by the San Joaquin Valley Air Pollution Control District (SJVAPCD).
<br />To assess effectiveness of the SVE, process samples were collected twice per month from the
<br />vapor stream before (INFL) and after (EFFL) the catalytic oxidizer. Each sample was
<br />analyzed for TPHg, BTEX, and MtBE. Maximum concentrations of detected constituents are
<br />presented below.
<br />1:1Chevron1957751Periodic Monitoring\Quarterly Progress Reportsl4thQuarter 200114th Quarter -2001 Progress Report.doc
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