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Chevron Products Company Page 3
<br />Fortner Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California April 15, 2002
<br />0 presented as Table 3.
<br />Between December 26 and March 29, 2002, the GWE system discharged a total of 1,037,685
<br />gallons of treated groundwater over a period of 92 days (Table 4). As of March 29, 2002, the
<br />GWE system has treated a total of 5,385,432 gallons. Calculated discharge rates during the
<br />March monitoring period ranged from 6.59 to 7.69 gallons per minute (gpm).
<br />IsDuring the 1st quarter the system extracted approximately 0.22 pounds of TPHg, 0.002
<br />pounds of benzene, and 1.17 pounds of MtBE. To date, the system has extracted
<br />approximately 7.57 pounds of TPHg, 0.305 pounds of benzene, and 82.69 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 />•
<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 />I:1Chevron1957751Periodic MonitoringlQuarterly Progress Reports1200211st Quarter -2002 Progress Report.doc
<br />Maximum Constituent Concentration (go)
<br />Sampling Port
<br />December 26 through March 29, 2002
<br />MtBE
<br />TBA
<br />EtBE
<br />TAME
<br />Ethanol
<br />Methanol
<br />INFL
<br />140
<br /><5.0
<br />11
<br />1.3
<br />24
<br /><200
<br />MID -1
<br />1.9
<br />7.3
<br />0.74
<br /><0.50
<br />6.0
<br /><50
<br />MID -2
<br />1.4
<br /><5.0
<br /><0.50
<br /><0.50
<br />12
<br />95
<br />EFFL
<br />1.2
<br />6.8
<br /><0.50
<br /><0.50
<br />5.7
<br />140
<br />Explanations:
<br />< Indicates the constituent was not present at or above the method reporting limit shown
<br />Between December 26 and March 29, 2002, the GWE system discharged a total of 1,037,685
<br />gallons of treated groundwater over a period of 92 days (Table 4). As of March 29, 2002, the
<br />GWE system has treated a total of 5,385,432 gallons. Calculated discharge rates during the
<br />March monitoring period ranged from 6.59 to 7.69 gallons per minute (gpm).
<br />IsDuring the 1st quarter the system extracted approximately 0.22 pounds of TPHg, 0.002
<br />pounds of benzene, and 1.17 pounds of MtBE. To date, the system has extracted
<br />approximately 7.57 pounds of TPHg, 0.305 pounds of benzene, and 82.69 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 />•
<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 />I:1Chevron1957751Periodic MonitoringlQuarterly Progress Reports1200211st Quarter -2002 Progress Report.doc
<br />
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