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7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report (1Q2006) <br /> May 16, 2006 <br /> Page 6 <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported on <br /> ice to a California state-certified laboratory Copies of the field notes are presented in <br /> Attachment A <br /> GROUNDWATER SAMPLE ANALYSES AND RESULTS <br /> The groundwater samples collected from MW-1 through MW-7, MW-1A, MW-4A, and MW5A <br /> were analyzed for TPHg, BTEX, and the fuel oxygenates MtBE, tert-butyl alcohol (TBA), <br /> dnsopropyl ether (DIPE), ethyl-tert-butyl ether (EtBE), and tert-amyl-methyl ether (TAME) by <br /> Environmental Protection Agency (EPA) Method 8260B The certified laboratory analytical <br /> report and chain-of-custody (COC) documentation are presented as Attachment B <br /> r <br /> Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 <br /> and 2 During the first quarter 2006, hydrocarbon concentrations continued to decrease in <br /> well MW-2 located immediately adjacent to, and downgradient of, the USTs and <br /> dispensers - <br /> REMEDIATION <br /> Remediation conducted during the first quarter 2006 was oxygen injection into SP-1 and <br /> SP-1A <br /> On January 3, January 20, February 1, February 16, March 9, and March 22, 2006, SECOR <br /> field personnel conducted oxygen injection into on-site sparge wells SP-1 and SP-1A <br /> Approximately 150 & of oxygen was injected into each well simultaneously (Table 4) <br /> Dissolved oxygen concentrations were measured before and after the injection event in <br /> monitoring well MW-2 (Table 5) The greatest D O concentration increase observed in <br /> MW-2, located adjacent to SP-1 and SP-1A, was from 9 8 milligrams per liter (mg/L) to 34 7 <br /> mg/L on January 20, 2006 SECOR will continue biweekly to monthly oxygen injection <br /> during the second quarter 2006 Copies of the field notes and laboratory analysis are <br /> presented in Attachment C <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR <br /> truck-mounted water tank The water is transferred into properly labeled 55-gallon drums and <br /> stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated water is <br /> transported quarterly by Belshire Environmental to DeMenno Kerdoon in Compton, California, <br /> for disposal <br /> 19976 06-1Q Report doc SECOR International Incorporated <br />