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28 December 1999 <br /> AGE-NC Project No. 97-0351 <br /> Page 5 of 7 <br /> 3.2. SOIL EXCAVATION <br /> For the reduction of MTBE and petroleum-hydrocarbon impacted soil in the former west UST area, <br /> contaminated soil in UST excavation will be excavated, sampledand transported to a licensed <br /> landfill facility for disposal. Based upon laboratory results of soil samples collected during removal <br /> procedures, an additional 250 to 350 yards of impacted soil will also be removed from the floor of <br /> the excavation and side wall of the former UST excavation-and transported for disposal. Soil will <br /> be excavated to a minium depth of 15 feet below surface grade (bsg)..The total volume anticipated <br /> for removal and disposal is estimated to be approximately 350•cubic yards. <br /> During excavation activities, excavated soil will be screened for volatile organic compounds using <br /> an organic vapor monitor (OVM). Excavated soil that appears visibly stained or has a petroleum <br /> hydrocarbon odor will be considered impacted. <br /> 3.3. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> A total of up 10 soil samples will be collected from the excavation will be submitted for laboratory <br /> analysis. Following State of California Regional Water Quality Board, Tri-Regional Board <br /> recommendations, soil samples will be collected from the base and each side wall of the "new" <br /> excavation at a minimum interval of every 20 linear feet. Soil samples will be collected from the <br /> base of the excavation at a minimum of one sample for every:400 square feet of excavation area. <br /> Field procedures for collection of soil samples are presented in Section 4.2. <br /> Soil samples will also be collected from the stockpiled soil from the excavation. For soil disposal <br /> characterization, a 4:1 composite soil sample will be collected.from every 100 yards of soil <br /> excavated. <br /> Each soil sample will be analyzed by a State of California Department of Health Services (DHS)- <br /> certified laboratory for the following constituents- <br /> • TPH-g by EPA Method 8015 Modified; <br /> • BTEX by EPA Method 8020; and <br /> • Fuel oxygenates including methyl tert-butyl ether(MTBE),tertiary-butyl alcohol (TBA), di- <br /> isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether <br /> (TAME) by EPA Method 8260 Modified. <br /> The laboratory report for soil analyses,testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> Advanced GcoEnviron mental,Inc. <br />