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Abdelwahed Facility July 12, 2005 r Stockton,-California _ - _ - Quarterly Groundwater Monit&ri5gRep6rt -- modified Environmental Protection Agency (EPA) Method 8015 and for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), 1,2-dichloroethane (DCA) and 1,2-dibromoethane (EDB) by EPA Method 8260B Results of Groundwater Monitoring Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to calculate groundwater elevations Groundwater elevation data, summarized in Table 1, were used to construct a groundwater contour map as shown on Figure 2 Groundwater elevation data indicate flow was generally eastward under a gradient of approximately 0 003 Analytical data are summarized in Table 1 Concentration data for TPHg, benzene and DCA are plotted on a site map as shown on Figure 3 The analytical report is contained in Attachment C GeoTracker Electronic Data Deliverables The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater well measurement EDD (GEO_WELL) for this quarterly monitoring event was uploaded by Horizon The GEO_WELL upload confirmation sheet is contained in Attachment D Discussion Horizon conducted vapor extraction and air sparge testing in May 2005 The results of the soil and groundwater investigation and the remedial testing shall be documented in reports currently in preparation Distribution A copy of this report should be forwarded to Mr Jeff Wong San Joaquin County Environmental Health Department 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 Sayed and Zakia Abdelwahed P O Box 1$2 . Stockton, California 95201 792gmr Q205 doc Project No 1792 42 2 HORIZON ENVIRONMENTAL INC.