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I IQuarterly Report - First Quarter 2004 • CALIFORNIA FUELS CARDLOCK STATION I2402 Pacific Avenue, Stockton, California I1.0. INTRODUCTION I At the request of Mr David Atwater,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report documenting the procedures and results for first quarter 2004 ground water monitoring event performed at 2402 Pacific Avenue(the site), Stockton, California, the report also I documents January, February and March 2004 progress of the in-situ air sparging (IAS) and soil vapor extraction (SVE) recovery system The objectives of the site activities were to monitor dissolved petroleum hydrocarbon concentrations in ground water, to assess ground water flow I direction and gradient, and to monitor the progress and effectiveness of SVE and IAS remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 This report has been prepared in accordance with guidelines issued bythe California Regional Water Quality Control Board(RWQCB)-Central Valley Region for investigation of underground storage tank(UST)sites A summary ofprevious investigations at the site was included in the AGE-prepared Corrective Action Plan-May 1998,dated 05 May 1998 Analytical data acquired to date is included in this report The following is a brief summary of site assessment and SVE remediation activities performed at the site between 30 December and 24 March 2004 (First Quarter 2004) I • Between 30 December 2003 and 24 March 2004-Continued SVE/IAS remediation utilizing on-site SVE wells (VW-1 through VW-4) and IAS well AW-2B, extracted a total of approximately 184 pounds of petroleum hydrocarbons from the subsurface • 26 January 2004 - Monthly monitoring event performed on SVE/lAS remediation system I • 23 February 2004 -Monthly monitoring event performed on SVE/IAS remediation system e 19 March 2004 - Quarterly ground water monitoring event (First Quarter 2004) performed Iat wells MW-1 through MW-13, AW-1 and AW-2 • 24 March 2004 - Monthly monitoring event performed on SVE/IAS remediation system I I2.0 GROUND WATER MONITORING AND SAMPLING PROCEDURES On 19 March 2004, ground water monitoring was performed at the site on single-level wells MW-1 through MW-12, multi-level well MW-13 (A, B and C) and air sparge wells AW-1 (A and B) and AW-2 (A and B), due to a discrepancy in the ground water monitoring results collected from well • MW-13C, the well was re-sampled on 09 April 2004 Groundwater monitoring procedures for the I I