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1 <br /> ' the associated UST system piping was removed during the closure activities. Following <br /> removal, four soil samples were collected from the excavation floor at approximately 13 feet <br /> below ground surface (bgs), and one soil sample was collected from the area of the former <br /> ' fuel dispenser at approximately three feet bgs (Secor, 1996). <br /> 1.2.2 Summary of Environmental Investigations,Remediation,and Monitoring <br /> Environmental investigations have been performed at the Site since February 1996. A <br /> summary of the environmental investigations is presented below. <br /> ' February 1996 — Secor International Incorporated (Secor) drilled four soil borings (MW-1, <br /> VE-I, SB-1, and SB-2) to total depths ranging from 38.5 to 46.5 feet bgs. Soil and <br /> groundwater samples were collected and analyzed for total petroleum hydrocarbons in the <br /> ' gasoline range (TPH-g), benzene, toluene, ethylbenzene, and total xylenes (BTEX). MW-1 <br /> was completed as a 2-inch diameter groundwater monitoring well screened from 26 to 46 feet <br /> bgs. VE-I was completed as a 4-inch diameter vapor monitoring well screened from 15 to 35 <br /> feet bgs (Secor, 1996). <br /> October 1997—Secor drilled one soil boring (MW-7) through the former tank excavation to a <br /> total depth of 90 feet bgs. MW-7 was completed as dual-nested 2-inch diameter groundwater <br /> monitoring wells with MW-7S screened from 55 to 63 feet bgs and MW-71) screened from 80 <br /> to 85 feet bgs (Secor, 1997). <br /> December 1997 — Secor drilled three cone penetration test (CPT) borings (CPT-1, CPT-2, <br /> and CPT-3) to depths of approximately 125, 115, and 120 feet bgs, respectively. One soil <br /> sample was collected from CPT-1 at 125 feet bgs, and groundwater grab samples were <br /> ' collected at various depths from each boring(Secor, 1998). <br /> May 2007 — PSC and ETIC drilled 11 soil borings (C1 through C11). The borings were <br /> idrilled to depths ranging from 44 to 48 feet bgs (ETIC, 2007c). <br /> July 2007 — Based on the findings of the April and May 2007 soil and groundwater <br /> investigation, PSC and ETIC installed four 2-inch diameter groundwater monitoring wells <br /> (MW-IA through MW-4A) in July 2007. The wells were installed to total depths ranging <br /> from 45 to 55 feet bgs (ETIC, 2007c). <br /> iApril 2008 — Between April 2 and April 11, 2008, PSC drilled eight CPT borings to further <br /> delineate the vertical and lateral extent of petroleum hydrocarbon impacts and evaluate <br /> hydrogeologic conditions in the deeper water bearing zones beneath the Site. Samples were <br /> collected and analyzed. The investigation report was submitted in August 2008. <br /> September 30, 2008 - In accordance with the August 15, 2008 CVRWQCB request, PSC <br /> prepared and submitted the Vapor Intrusion Survey — Soil Gas Sampling Work Plan on <br /> September 30, 2008. The work plan described activities used to evaluate the soil vapor <br /> intrusion pathway. <br /> 1 November 2008 — PSC prepared a Feasibility Study/Remedial Evaluation (FS/RE) to <br /> evaluate at alternatives for remedies at the Site. <br /> Monitoring Well Installation <br /> and <br /> BioSparge Evaluation Report <br /> ' Prepared For:Sam Lee Bakery Group,Inc. 3 Prepared By:PSC Industrial Outsourcing,LP <br /> Sam Lee—Lincoln Streat 2009_12_03-MW Installation&BioSparge Evaluation Report(Finap.doc Report Date:December 3,2009 <br />