ARCHIVED REPORTS_QUARTERLY GROUNDWATER MONITORING REPORT 1ST QUARTER-JANUARY 2010

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January 2009 — In accordance with the August 15, 2008 CVRWQCB request, PSC prepared ' and submitted the Vapor Intrusion Survey —Soil Gas Sampling Work Plan on September 30, 2008. The field activities were performed in January 2009. The Vapor Intrusion Survey — Soil Gas Sampling Report was prepared and submitted to CVRWQCB on March 31, 2009. ' The CVRWQCB approved the report in their response letter dated April 29, 2009. June 2009—In accordance with the August 15, 2008 CVRWQCB request, PSC submitted the ' Feasibility Study/Remedial Evaluation Report to CVRWQCB on November 30, 2008. The CVRWQCB reviewed the report and submitted a request to submit a remediation pilot study work plan in a letter dated December 23, 2008. As well, the CVRWQCB requested a work plan to install additional groundwater monitoring wells at the Site. PSC prepared and submitted to CVRWQCB the BioSparge Detailed Evaluation and Monitoring Well Installation Plan on April 1, 2009. In this plan, PSC recommended that additional sampling ' be performed during the monitoring well installation to further evaluate the biosparge as a remedial alternative. The CVRWQCB approved the monitoring well installation work plan, but wanted additional justification for the biosparge evaluation sampling. PSC submitted ' correspondence detailing the necessity for the additional sampling in an email message to the CVRWQCB on May 12, 2009. The well installation field activities were performed in June 2009. 1.2.3 Groundwater Monitoring PSC initiated quarterly groundwater monitoring at the Site in January 2007 in accordance ' with the September 26, 2006 CVRWQCB request. Prior to this, it appears as though MW-1 was sampled once in February 1996 and MW-7S and MW-7D were sampled once in October 1997. There is no record that VE-1 was sampled prior to 2007. ' From January through May 25, 2007, approximately 500 milliliters (mL) of liquid-phase hydrocarbons (LPH) were removed from well VE-1. LPH has not been detected in well VE-1 ' since April 2007. Consequently, VE-1 has been sampled during quarterly groundwater monitoring activities since July 2007. The CVRWQCB requested that well VE-1 be included in all subsequent quarterly monitoring events in a letter dated October 12, 2007. LPH has not been detected in the other wells installed at the Site on behalf of Sara Lee and its predecessors. ' The CVRWQCB requested that the monitoring wells continue to be monitored on a semi- annual basis during the second and fourth quarters in a letter dated March 17, 2010. The letter also stated that since the Site's application into the Commingled Plume Account is under review that the board is directing all subsequent activities to be coordinated through a single point of contact. Since PSC is not the point of contact, the subsequent activities including the semi-annual groundwater monitoring will not be coordinated or reported by PSC. ' 1.3. Local Geology Soil encountered in the 15 borings and wells drilled at the Site in 2007 generally consisted of silt and/or clay with lesser amounts of sand. A silty sand layer measuring approximately 0.5 Quarterly Groundwater Monitoring Report First Quarter-January 2010 Prepared For:Sate Lee Bakery Group,Inc. Prepared By:PSC Industrial Outsourcing,LP ' Sara Lee-Lincoln Stone:\2010-01-Q1-QMR(Llneoln).doc May 10,2010 3