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Ch4vron Products Company '- Former Chevron 9 5775 301 WLs1 Ketlleman Lane Lodi ( A Fchruaty 9 2000 ! tertiary butyl ether (EtBE), and tertiary amyl methyl ether (TAME) were reported as 3,200 ug/l, 82 ug/l, 150 ug/l, 33 ug/l, respectively MtBE and TBA weie reported in midpoint 1 at maximum concentrations of 2,500 ug/l and 36 ug/l, respectively MtBE and TBA were reported in midpoint 2 at concentrations of 2 ug/1 and 53 ug/1, respectively Between December 27 and January 31, 2001, the GWE system discharged a total of 421,943 gallons of treated groundwater over a period of 34 days (Table 2) As of January 31, 2001, the GWE system has treated a total of 842,125 gallons Calculated discharge rates during the January monitoring period ranged from 8 23 to 8 58 gallons per minute During the January monitoring period the system extracted approximately 0 83 pounds of TPHg, 0 008 pounds of benzene, and 9 15 pounds of MtBE To date, the system has extracted approximately 4 19 pounds of TPHg, 0 123 pounds of benzene, and 51 64 pounds of MtBE System Modifications On January 26, 2001, USFilter/Westates performed a carbon change -out of vessels A and B (Figure 3) SECOR field personnel changed the flow direction with carbon vessels A, B, and C, becoming plumed in series as 3, 2, and 1, respectively The vessels were also changed from bottom loading to top loading Summary of Violations During the January discharge period there was a violation of the discharge limitations for methyl tertiary butyl ether (MtBE) All additional petroleum hydrocarbons and fuel oxygenates were reported as nondetect MtBE was reported in the effluent sample during the final sampling event for this period (January 31, 2001), at a concentration of 0 88 ug/1 This detection of MtBE occurred three days following the carbon change -out of vessels A and B Upon further investigation, field personnel responsible for oversight of the activated carbon replacement reported that the hoses connecting the vessels were not replaced following the change -out Furthermore, the hose currently used as the effluent line was used as the midpoint hose in the previous configuration It is SECOR's opinion that this minor detection of MtBE was the result of residual MtBE within the midpoint hose (now the effluent hose) To prevent the reoccurrence of this problem, hoses connecting the carbon vessels will be replaced at the time of the carbon change - out Analytical data was received on February 7, 2001 from Kiff Analytical Replacement of . the effluent hose and confirmation sampling occurred on February 8, 2001 A report 077 41991 04 WDischarge Report 2_9