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S E C 0 R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report(4Q2003) <br /> March 4, 2004 <br /> Page 5 <br /> INTERIM REMEDIATION <br /> The current interim remediation process includes SVE on the horizontal vent wells, in combination <br /> with oxygen infection into SPA and SP-1A During the fourth quarter 2003, mobile SVE was not <br /> performed at the site due to a pending Permit to Operate through the San Joaquin Valley Air <br /> Pollution Control District Mobile SVE will resume during the first quarter 2004 <br /> On November 7, December 12, and December 22, 2003, SECOR field Personnel performed oxygen <br /> infection into site sparge wells SPA and SP-1A Approximately 150 ft of oxygen was infected into <br /> each well simultaneously over a period of 0 75 to 1 5 hours (Table 4) Dissolved oxygen <br /> concentrations were measured before and after the infection event in select onsite monitoring wells <br /> (Table 7) The highest D O increase was observed in MW-2, located adjacent to SPA and SP-1A, <br /> which saw an increase from 1 0 milligram per liter (mg/L) to 22 5 mg/L SECOR will continue <br /> biweekly to monthly oxygen infection during the first quarter 2004 <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- ry <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 410 <br /> f <br /> Attachment B—Certified Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> P;T <br /> cc Mr Harlin Knoll, San Joaquin County, Environmental Health Department <br /> Mr James Barton, Regional Water Quality Control Board, Central Valley Region <br /> r <br /> 7 <br /> b� <br /> r <br /> r <br /> e F <br /> a ' <br /> i <br /> 3 <br /> 19976 03-4Q Report SECOR International incorporated <br />