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i p Former Beacon Station No 12474 July 13,2005 4 } Stockton California Quarterly Groundwater Monttoring/Remediation Status Resort California The samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether (MTBE) by Environmental Protection Agency (EPA) Method 8260B Groundwater Monitoring Results Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to calculate groundwater elevations Groundwater elevation data, as summarized in Table 1, were used to construct the groundwater elevation contour map shown on Figure 2 The groundwater flow direction in the dispenser island area varied from northeastward to eastward under a gradient of approximately 0"001 Groundwater analytical results are summarized in Table 1 Benzene concentration data were used to construct an isoconcentration map as shown on Figure 3 Analytical reports are contained in Attachment C Historical groundwater level and analytical data collected prior to 1998 are summarized in Tables 1 and 2 in Attachment D GeoTracker Electronic Data Deliverables The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater well measurement file EDD (GEO_WELL) for this quarterly monitoring event was uploaded by Horizon The GEO_WELL upload confirmation sheet for this quarter is contained in Attachment E Vapor Extraction System Monitoring Construction for a vapor extraction system (VES) and an air sparging system was conducted in late 2004 The San Joaquin Valley Air Pollution Control District (APCD) issued a modified Authority to Construct permit in October 2004 Final equipment connections were made and final system preparations were conducted during first quarter 2005 Operation of the VES was initiated on March 3, 2005 Final inspection of the VES was conducted by the APCD on May 19, 2005 Horizon submitted the Authority to Construct Inspection Report on June 21, 2005 Issuance of the Permit to Operate is expected during third quarter 2005 The location of the remediation system compound and underground piping is shown on Figure 4 The VES_ consists of a Mgtive- splacement —b--lower rated_at_250 cubic feet per minute (cfm), a Then-nTech Vac 25 thermal/catalytic oxidizer and other associated equipment as shown on Figure 5 The VES is setup to extract vapors from vapor extraction wells VW-1 through VW-7 Soil vapor flow from each well is controlled by individual valves The air sparging system consists of two 7 5 cfin and other associated equipment as shown on Figure 5- The air sparge system is set up to sparge air to sparge well AS-1 and monitoring wells MW-2 and MW-12 Air sparging was initiated on June 27, 2005 474gmr Q205 doc Project No 1474 48 2 HORIZON ENVIRONMENTAL INC. 7 X41 ti