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r' • • Quarterly Report - Second Quarter 2008 RALPH SQUARE-BUI 2122 South Airport Way, Stockton, California 1.0. INTRODUCTION At the request of Ms.Kimberly Hoang,Advanced GeoEnvironmental,Inc. (AGE)has prepared this quarterly report for the property located at 2122 South Airport Way, Stockton,California(site). The site and the surrounding area are illustrated on Figure 1. Structures,borings and well locations are illustrated on Figure 2. Site background information is summarized in Appendix A. 2.0. PROCEDURES On 29 April 2008, wells MW-1 through MW-11 were monitored and sampled in accordance with AGE's standard monitoring and sampling procedures, provided in Appendix B. Field logs are provided in Appendix C. On 06 June 2008, Advanced Chemical Transport, Inc. (ACT), of Merced, California picked up sixteen 55-gallon drums, an estimated 6,400 pounds of waste soil.Additionally,ACT picked up ten 55-gallon drums,an estimated 550 gallons of waste water.The drums were disposed,under manifest, on 11 June 2008 at GEM Rancho Cordova, a licenced disposal facility in Rancho Cordova, Ca. A copy of the non-hazardous waste manifest is included in Appendix D. 3.0. FINDINGS The ground water elevation, flow direction,and gradient were determined from field data collected on 29 April 2008. The hydrocarbon impact to ground water was quantified by the laboratory analytical data. • At the time of the April 2008 sampling event,depths to ground water ranged from 34.10 feet (MW-11)to 36.47 feet(MW-4)below the tops of the well casings (btoc) (Table 1). Ground water elevations ranged from 17.86 feet (MW-11) to 19.89 feet (MW-10) below mean sea level (MSL). The ground water elevation averaged 19.61 feet below MSL, representing an increase of approximately 1.62 feet since the January 2008 monitoring event. • During this monitoring event, ground water level in the wells was approximately six feet below the tops of the shallow well screens,indicating the wells were properly screened and should be representative of shallow ground water conditions. • The net ground water flow was inferred to be east to southeast with a calculated hydraulic gradients of 0.001 ft/ft. Figure 3 illustrates the contoured ground water elevations as measured on 29 April 2008. Advanced GeoEnvironmental,Inc.