SITE INFORMATION AND CORRESPONDENCE

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Lisa Medina [EH] From: Daniel Villanueva <dvillanueva@advgeoenv.com> Sent: Friday, March 02, 2012 2:28 PM To: Lisa Medina [EH] Cc: wlittle@advgeoenv.com; Robert E. Marty Subject: Ocampo Property: 821 South Wilson Way, Stockton, California: Site Update and Additional Recommendations Ms. Medina, Between 19 and 22 December 2011, Advanced GeoEnvironmental Inc. (AGE) performed an in-situ air sparging pilot test at the Former Ocampo Property site, located at 821 South Wilson Way, Stockton, California. On 25 January 2012,AGE submitted the In-Situ AirSporging Pilot Test Report detailing the procedures and results from the pilot test. In the report, AGE recommended preparation of a Corrective Action Plan and suspension of all ground water monitoring at the until the third quarter 2012, when it was anticipated that more funding for the site would be available. On 14 February 2012, the State Water Resources Control Board issued a letter allocating additional funding for Hfe 2011- 2012 for the site. In light of the recent events, AGE makes the following additional recommendations to the above referenced pilot study report: • Extension of the In-situ air sparging pilot test at the above referenced site. AGE recommends extending the pilot study for a period of 60 days to further evaluate the technology on the dissolved phase plume at the site. The pilot test should be conducted by injecting air from an aboveground air compressor into well MW-6; sparged vapors would be recovered identically to the 72-hour pilot test utilizing onsite well VW-1 and the onsite soil vapor extraction system. Additionally, AGE recommends that the soil vapor extraction system be connected to onsite well MW-5 for additional vapor recovery. As part of the extended pilot test, influent and effluent vapor samples and standard operation and maintenance of the vapor system and proposed air sparging system will be conducted once per week throughout the duration of the test to evaluate remedial performance. During the proposed pilot test ground water samples will be collected from well MW-5, once per month for the proposed 60-day period to evaluate the air sparging performance. • Preparation of a Corrective Action Plan immediately following the termination of the proposed extended pilot test and receipt of the final analytical results. Monies allocated for the site should be focused on the extension of the pilot test and findings from the test should be used to further evaluate the air sparging technology in the feasibility sections of the proposed corrective action plan. • Upholding of the recommendations to suspend all ground water monitoring at the site until the third quarter of 2012. Upon EHD approval, AGE will immediately begin the extended pilot study and notify SJCEDH staff 24-hours before restarting the onsite air sparing and soil vapor extraction systems. Should you have any further questions please do not hesitate to contact me. Thanks, 1