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In-Situ Air Sparging Pilot Test Report Former OCAMPO PROPERTY 821 North Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared this report for 821 South Wilson Way, Stockton, California (site). This report documents the procedures and results of a 72-hour in-situ air sparging (IAS) pilot test performed in December 2011. The site and surrounding area are illustrated on Figure 1. Structures and well locations are illustrated on Figure 2. Site well details are summarized in Table 1. Site background information is provided in Appendix A. The purposes of the 72-hour IAS pilot test were to evaluate: (1) the feasibility of IAS as a remedial alternative for ground water at this site, (2) the effects of IAS on the currently installed soil vapor system and to (3) evaluate data to determine most appropriate IAS network design for the site. This report is prepared in accordance with guidelines established by the California Regional Water Quality Control Board - Central Valley Division for investigation of underground storage tank (UST) sites. Pilot testing was performed in accordance with procedures outlined in the AGE-prepared In-situ Air Sparging Pilot Study Work Plan, dated 31 October 2011. 2.0 IN-SITU AIR SPARGING PILOT TEST PROCEDURES Between 19 December and 22 December an approximate 72-hour IAS pilot test was conducted at the site. The IAS was accomplished utilizing using monitoring well MW-6 (screened 70 to 75 feet below surface grade [bsg]) as an active sparging point and pressure was supplied by an electric air compressor to inject air beneath the water table at well MW-6. The on-site SVE system was utilized to recover sparged vapor from well VW-1 throughout the duration of the pilot test. Prior to the commencement of the IAS pilot test, baseline depth to water and dissolved oxygen (DO) measurements were collected from observation wells MW-1 through MW-5. A baseline ground water sample was also collected from well MW-5 prior to system startup to evaluate the short-term effects of air sparging at the well location. All sampleswere analyzed by Cal Tech Environmental Laboratories (CTEL), a State of California Department of Public Health-certified analytical laboratory for the following constituents: v•\ c • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA method 8015M; Advanced GeoEnvironmcntal, Inc.