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Former Beacon Station No 12419 January 26,2006 Stockton California Groundwater Monitoring Report yr Groundwater Monito'ring Results Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to •i calculate groundwater elevations Groundwater elevation data were used to construct the groundwater elevation contour map shown on Figure 2 The data indicate groundwater in the underground storage tank area flowed roughly northward under a gradient of approximately 0 001 i Groundwater analytical results are summarized in Table I Benzene concentration data from' this sampling event were used to construct'the benzene isoconcentration map shown on Figure 3 The analytical report is contained in Attachment C Vapor Extraction System Monitoring Installation of a vapor extraction system (VES) and an air sparge (AS) was completed in late, July 2005 The San Joaquin Valley Air Pollution Control District (APCD) issued Authority to Construct permit No N-4910-1-1 on July 14, 2005 Operation of the VES was initiated on, August 2, 2005 Inspection of the VES by the APCD was conducted on October 11, 2005 I he location of the ieinedjation system compound and-underground piping is shown on Figure 4 The VES consists of a positive-displacement blower rated at 100 cubic feet per minute (cfni), an E,VAX 520 catalytic oxidizer and other associated equipment as shown in the pi ocess flow diagram on Figure 5 The VES is Set up to extract vapors from vapor extraction wells VW-1 and VW-2, and monitoring wells MW-7, MW-9, MW-l0 and MW-,l I Soil vapor _ flew from each well is cuntiolled by individual valves The AS consists of a 1 5 h,)-sepowel, -7 5 cfin air compressor and oWer_associated 'equipment as shown on-Figuic 5 1 lie-AS is set up - �f- to sparge air to sparge wells AS-1, AS-2, AS-3 and monitoring wells MW-1 and MW-3 Air sparging was not conducted dui ing fourth quare c i 2005 The VES reporting period for this report is September 26 to December 22, 2005 The VES operated-for-d-total�of approximately=82-days- --Influent-an&effluent=vapor-samples were`=` collected en October 11, November 7 and December 8, 2_005 Analytical reports are con_tained __ Tiri-Attachriient C�-Vapor extraction systemdata are summarized jn Table 2 Y r �T The average influent flow during the third quarter was approximately 20 standard cubic feet per minute During the fourth quarter reporting period, approximately 1,174 pounds of TPHg and 0 8 pound of benzene were removed by the VES As of the end of the fourth quarter reporting period, approximately 1,972 pounds of TPHg and 1 4 pounds of benzene have been removed by the VES GeoTracker Electronic Data Deliverables i The analytical electronic data deliverable (EDD) was prepared and uploaded by Kiff The groundwater level EDD (GEO_WELL) was prepared and uploaded by Horizon The GEO_WELL'upload confirmation sheet for this quarter and the Quarterly Monitoring Report EDD (GEO_REPORT) upload confirmation sheet for the previous quarter are contained in Attachment E j 419gmr Q405 Project No 1419 48 2 HORIZON ENVIRONMENTAL INC-