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! � i TABLE 4 GROUNDWATER EXTRACTION SYSTEM PERFORMANCE DATA Former Chevron Service Station 9-5775 301 West Kettleman Lane Lodi,California TPH as Gasoline Benzene MtBE Average Influent Influent Influent Totalizer Volume Discharge Concen- Removal Net Removed Concen- Removal Net Removed Concen- Removal Net Removed Sample Date Value Discharged Rate tratlon Rate Removed To Date tration Rate Removed To Date tratlon Rate Removed To Date ID Sampled Notes _(gallons) (gallons) m (lbs/day) (pounds) (pounds) IL Ibstda (pounds) (pounds) /L Ibslda (pounds) (pounds) INFL 10/22/03 8 186 420 338,556 653 <50 000 011 9 3 <2 00001 0 003 02 9 000 0 03 849 INFL 11/14/03 8408,409 221,989 670 <100 000 007 9 4 <2 00001 0 002 02 9 000 002 85 0 INFL 12/11/03 8,663,405 254,996 656 <50 000 008 9 4 <2 00001 0 002 02 <2 000 0 01 850 INFL 01/19/04 J — — -- <50 000 008 95 <2 00001 0 002 0 2 9 0 00 000 850 INFL 02/09104 9,145,889 241,242 558 <50 000 008 96 <2 00001 0 002 0 2 6 000 0 01 850 INFL 03/09/04 9,428 621 282,732 677 <50 000 009 97 <2 00001 0 002 02 6 000 0 01 850 REPORTING PERIOD FIRST QUARTER 2004 PERIOD WATER DISCHARGED(gallons) 765,216 AVERAGE PERIOD DISCHARGE RATE(gpm) 62 TOTAL POUNDS REMOVED 97 0 2 85 0 TOTAL GALLONS REMOVED 16 0 0 138 PERIOD POUNDS REMOVED 02 0 0 0 0 PERIOD GALLONS REMOVED 00 0 0 0 0 EXPLANATIONS Notes pg/L=Micrograms per liter a System started by Gettler Ryan gpm=Gallons per minute b Data prior to November 1 2000 collected and reported by Gettter Ryan lbs/day=Pounds per day c Weekly O&M not performed on November 15 and 22 2000 due to system upgrades and aquifer test TPH=Total petroleum hydrocarbons d Start-up of extraction well EX 3 Density of gasoline=6 1 pounds per gallon a -Weekly Volume"discharge volume refers to total through put volume between 11108 to 11129 2000 Density of benzene=7 34 pounds per gallon Actual weekly discharge vaned significantly due to aquffer test performance Density of MtBE=6 18 pounds per gallon f Weekly O&M not performed on February 14 2001 Carbon vessels A B and C changed out M16E=Methyl tertiary butyl ether system Closes changed and vessels pressure washed g Carbon Vessel A changed-out In New totalizer Installed I Pump in EX-3 replaced System down approximately 2 hours J Field measurements not collected ASSUMPTIONS i) Percent carbon loading calculation assumes a loading Isotherm of 3%by weight 2)Mass removal calculations assumes concentrations of one half the detection limit when concentrations are reported as below detection limits I I i 1ChevroN95775Irablea1Gwe-qpr As 5 of 5