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Extended 60-Day In-Situ Air Sparging Pilot Test Report <br />Former OCAMPO PROPERTY <br />821 North Wilson Way, Stockton, California <br />1.0. INTRODUCTION <br />At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared <br />this report for 821 South Wilson Way, Stockton, California (site). This report documents <br />the procedures and results of an extended 60-day in-situ air sparging (IAS) pilot test <br />performed at the site between 16 March and 16 May 2012. The site and surrounding area <br />are illustrated on Figure 1. Structures and well locations are illustrated on Figure 2. Site <br />well details are summarized in Table 1. Site background information is provided in <br />Appendix A. <br />The purposes of the extended 60-day IAS pilot test were to evaluate: (1) the feasibility of <br />IAS as a remedial alternative for ground water at this site, (2) the effects of IAS on the <br />currently installed soil vapor system and to (3) evaluate data to determine most appropriate <br />IAS network design for the site. <br />This report is prepared in accordance with guidelines established by the California <br />Regional Water Quality Control Board - Central Valley Division for investigation of <br />underground storage tank (UST) sites. Pilot testing was performed in accordance with <br />procedures outlined in email correspondence with San Joaquin County Environmental <br />Health Department (SJCEHD) staff dating 02 March 2012 and in accordance with SJCEHD <br />directives by letter dating 04 March 2012. <br />or vv.(U k4e."1.1.- - 12 otiptLI z7 <br />17 /40 — it /441 --z9dwjs <br />2.0 IN-SITU AIR SPARGING PILOT TEST PROCEDURES <br /> 5'4 -dol• <br />Between 16 March and 16 May 2012 an approximate 60-day extended IAS pilot test was <br />conducted at the site. On 12 April 2012 the pilot test was temporarily suspended due <br />elevated soil vapor concentration in the effluent samples of the SVE carbon treatment <br />system. The spent carbon was removed from lag vessel and replaced by Slaby <br />Environmental of Capistrano Beach, California on 13 April 2012. Spent carbon was <br />disposed of under non-hazardous waste manifest, which has been included in <br />Appendix B. The system was temporarily restarted to verify the integrity of the carbon on <br />13 April 2012. The system and pilot study was resumed on 17 April 2012 and was <br />operational without further stops through 16 May 2012. <br />The IAS was accomplished utilizing using monitoring well MW-6 (screened 70 to 75 feet <br />below surface grade [bsg]) as an active sparging point and pressured air was supplied by <br />an electric air compressor to inject beneath the water table, into the screen interval of well <br />MW-6. The on-site SVE system was utilized to recover sparged vapor from wells VW-1 and <br />MW-5, throughout the duration of the pilot test. <br />rtki - 70- 7ci <br />k) 35- 515- <br />sA, - 35"- ' <br />NW 3 35 <br />IA ' <br />rt,J 35". <br />14" VIPC <br />et 3 cac 3i_ ‘5, CM: <br />AIL <br />elt. y5 IAL <br />55 CI_ 5.5" ?"- <br />50 CL <br />PAL_ <br />L <br />cM 45 <br />p <br />Advanced GeoEnvironmental, Inc.