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S E C 0 R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report(202003) <br /> September 11, 2003 <br /> Page 5 <br /> oxygen concentrations were measured before and after the injection event in each sparge well and <br /> in monitoring wells adjacent to the sparge wells The highest D O increase was observed in MW-2, <br /> located adjacent to SP-11SP-1A, which saw an increase from 0 5 milligrams per liter (mg1L) to 34 4 <br /> mg/L SECOR will continue biweekly oxygen injection during the third quarter 2003 <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR truck- <br /> mounted water tank The water is transferred into properly labeled 55-gallon drums and stored on- <br /> site The drummed non-hazardous petroleum hydrocarbon contaminated water is transported <br /> quarterly by Belshire Environmental to Demenno Kerdoon in Compton, California, for disposal <br /> ATTACHMENTS <br /> Figures <br /> Tables <br /> Attachment A- Field Notes <br /> Attachment B-Certified Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> cc Mr Harlin Knoll, San Joaquin County END <br /> 41 <br /> 1 <br /> Iv <br /> x ti <br /> M1A n <br /> { <br /> `f 3 <br /> �flF <br /> Xh <br /> 19976 03-20 Report doc SECOR International incorporated <br />