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S E C ® R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report (1Q2004) <br /> June 3, 2004 <br /> Page 5 <br /> Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 and 2 <br /> Chemical concentrations were generally consistent with historical data <br /> INTERIM REMEDIATION <br /> The current interim remediation process includes SVE on the horizontal vent wells, in combination <br /> with oxygen injection into SPA and SP-1A During the fourth quarter 2003 and first quarter 2004, <br /> mobile SVE was not performed at the site due to a pending Permit to Operate through the San <br /> Joaquin Valley Air Pollution Control District Mobile SVE will resume during the second quarter 2004 <br /> when the permit is approved and issued <br /> On January 7, January 23, February 4, February 19, March 5, March 22, And March 30, 2004, SECOR <br /> field personnel performed oxygen injection into site sparge wells SP-1 and SP-1A Approximately <br /> 150 W of oxygen was injected into each well simultaneously over a period of 0 5 to 1 0 hours (Table <br /> 4) Dissolved oxygen concentrations were measured before and after the injection event in selected <br /> onsite monitoring wells (Table 5) The highest D O increase was observed in MW-2, located w <br /> adjacent to SPA and SP-1A, which saw an increase from 0 9 milligram per liter (mg/L) to 46 0 mg/L <br /> on March 30, 2004 SECOR will continue biweekly to monthly oxygen injection during the second <br /> quarter 2004 Copies of the field notes are included in Attachment C <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—Monitoring and Sampling Field Notes <br /> Attachment B--Certified Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> Attachment C—Operations and Maintenance 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 /> ilk <br /> S <br /> 19976 04-1Q Report doc SECOR International Incorporated <br />