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S E C 0 R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report (1Q2005) <br /> May 4, 2005 <br /> . Page 6 w <br /> On January 7, January 28, February 9, March 1, March 15, and March 31, 2005, SECOR i <br /> field personnel conducted oxygen infection into on-site sparge wells SP-1 and SP-1A 150 <br /> ft3 of oxygen was infected into each well simultaneously (Table 4) Dissolved oxygen <br /> concentrations were measured before and after the infection event in selected onsite <br /> monitoring wells (Table 5) The highest D O concentration increase was observed in MW- <br /> 2, located adjacent to SP-1 and SP-1A, which showed an increase from 0 7milligram per <br /> liter (mg/L) to 50 0 mg/L on January 7, 2005 SECOR will continue biweekly to monthly <br /> oxygen injection during the second quarter 2005 Copies of the field notes and laboratory <br /> analysis are 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 <br /> and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated <br /> water is transported quarterly by Belshire Environmental to DeMenno Kerdoon in Compton, <br /> California, for disposal <br /> t <br /> ATTACHMENTS <br /> Figures <br /> Tables <br /> Attachment A— Monitoring and Sampling Field Notes <br /> Attachment B—Certified Laboratory Analytical Reports and Cham-of-Custody Documentation <br /> Attachment C —Oxygen Injection Field Notes <br /> cc Ms Vicki McCartney, San Joaquin County, Environmental Health Department <br /> Mr James Barton, Regional Water Quality Control Board, Central Valley Region <br /> b <br /> 19976 05-1 Q Report doc SECOR International Incorporated <br />