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1 <br /> `S E C0 R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report (3Q2003) <br /> November 26, 2003 <br /> Page 5 <br /> INTERIM REMEDIATION <br /> The current interim remediation process includes SVE on the horizontal vent wells, in combination <br /> with oxygen sparging into SP-1 and SP-1A During the second 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 in the fourth quarter 2003 <br /> On July 24, August 4, August 19, September 5, and September 16, 2003 SECOR field personnel <br /> performed oxygen injection into site sparge wells SP-1 and SP-1A (Tables 4 and 5) Approximately <br /> 150 cubic feet of oxygen was injected into each well simultaneously over a period of approximately <br /> 10 to 1 5 hours (Table 4) Dissolved oxygen concentrations were measured before and after the <br /> injection event in each sparge well and in monitoring wells adjacent to the sparge wells As shown <br /> by the dissolved oxygen readings presented in Table 2, injection of oxygen into wells SP-1 and SP- <br /> 1A resulted in an increase in dissolved oxygen in wells MW-1, MW-1A, MW-3, MW-4 and MW-4A <br /> As shown in Table 5, the dissolved oxygen concentrations in MW-2 show a significant increase, that <br /> within two weeks declines significantly Comparison of the dissolved oxygen concentrations in MW-2 <br /> with the declining dissolved TPHg, BTEX, MtBE, and TBA concentrations, indicates the remedial <br /> approach is accelerating the bio-degradation of dissolved hydrocarbons in groundwater SECOR will <br /> 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 3 <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, Environmental Health Department h' <br /> Mr James Barton, Regional Water Quality Control Board, Central Valley Region <br /> 19976 03-3Q Report doc SECOR lntematlonal Incorporated <br />