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S E C ® R 7-Eleven Store#19976 Quarterly Groundwater Monitoring and Rernediation Progress Report(3Q2005) October 27, 2005 . Page 6 1 into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California state-certified laboratory Copies of the field notes are presented in Attachment A GROUNDWATER SAMPLE ANALYSES AND RESULTS The groundwater samples collected from MW-1 through MW-7, MW-1A, MW-4A, and MW- 5A were analyzed for TPHg, BTEX, and the fuel oxygenates MtBE, tert-butyl alcohol (TBA), diisopropyl ether (DIPE), ethyl-tert-butyl ether (EtBE), and tert-amyl-methyl ether (TAME) by Environmental Protection Agency (EPA) Method 82606 The certified laboratory analytical report and chain-of-custody (COC) documentation are presented as Attachment B Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 and 2 Hydrocarbon concentrations were generally consistent with historical data REMEDIATION Remediation conducted during the second quarter 2005 was oxygen infection into SP-1 and SP-1A ` yn . LF On July 7, July 21, August 3, August 19`� eptember 16, and September 23, 2005, SECOR field personnel conducted oxygen infection into on-site sparge wells SP-1 and SP-1A 150 ft3 of oxygen was infected into each well simultaneously (Table 4) Dissolved oxygen concentrations were measured before and after the infection event in monitoring well MW-2 (Table 5) The greatest D O concentration increase observed in MW-2, located adjacent to SP-1 and SP-1A, was from 0 7 milligrams per liter (mg/L) to 30 3 mg/L on September 16, 2005 SECOR will continue biweekly to monthly oxygen infection during the fourth quarter 2005 Copies of the field notes and laboratory analysis are presented in Attachment C ` PURGE AND RINSATE WATER DISPOSAL Water generated during well sampling and equipment cleaning is pumped into a SECOR truck-mounted water tank The water is transferred into properly labeled 55-gallon drums and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated water is transported quarterly by Belshire Environmental to DeMenno Kerdoon in Compton, California, for disposal ATTACHMENTS Figures Tables Attachment A--Monitoring and Sampling Field Notes Attachment B —Certified Laboratory Analytical Reports and Chain-of-Custody Documentation Attachment C—Oxygen Infection Field Notes cc Ms Vicki McCartney, San Joaquin County, Environmental Health Department Mr James Barton, California Regional Water Quality Control Board, Central Valley Region Mr John Wainwright, SECOR, 308 East 4500 South, Suite 100, Murray, Utah 84107-3957 r a 19976 05-3Q Report doc SECOR International Incorporated