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Beacon Station No. 3641 July 27, 2005 Stockton, California Quarterly Groundwater Monitoring/Remediation System Report other associated equipment as shown on Figure 7. The air sparge system is set up to sparge air to sparge well SW-1. It is expected that air sparging will be initiated in third quarter 2005. The VES reporting period for this report is March 3 to June 23, 2005. The VES operated for a total of approximately 85 days from March 3 to June 23, 2005. Influent and effluent vapor samples were collected on March 4, April 20, May 5, May 19 and June 2, 2005. Analytical reports are contained in Attachment C. Vapor extraction system data are summarized in Table 2. The VES was shut in on June 23 due to blower electrical problems. The average influent flow during the first quarter was approximately 114 standard cubic feet per minute. Approximately 5810 pounds of TPHg and 58 pounds of benzene were removed by the VES through the end of the second quarter reporting period. Recommendations As part of an additional subsurface investigation, Horizon installed off-site groundwater monitoring wells MW-9 and MW-10 and on-site monitoring wells MW-11, MW-12 and MW-13 during fourth quarter 2004. The report of the additional subsurface investigation is in preparation. Horizon recommends continued quarterly monitoring during the ongoing investigation and remediation phases of the project. Distribution - l A copy of this report should be forwarded to: Mr. Michael Infurna Jr., Senior R. E. H. S. San Joaquin County Environmental Health Department j 304 East Weber Avenue, Third Floor Stockton, California 95202-2708 Mr. James L.L. Barton Regional Water Quality Control Board Central Valley Region 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 Mr. Eric Schneider Auburndale Properties Inc. 2951 28t1i Street, Suite 2050 Santa Monica, California 90405 641gmrQ205.doe Project No. 1641.48 3 HORIZON ENVIRONMENTAL INC.