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17 October 2007 <br />AGE -NC Project No. 07-1569 <br />Page 3 of 5 <br />former glass disposal site. Based on historical information Wong Engineers, Inc. estimates the glass <br />disposal site to be approximately 6.7 acres. Exhibits A through E (Appendix A) illustrate the <br />estimated extent, as determined by Wong Engineers, Inc. <br />During excavation activities, soil will be screened for organic vapors using a organic vapor meter <br />(OVM). Saturated soil will be piled within piles of dry impacted soil for disposal and excavated soil <br />that appears visibly stained or has a petroleum hydrocarbon odor will be considered impacted. <br />3.3. SOIL SAMPLE COLLECTION AND ANALYSIS <br />Based upon field screening of excavated soil, samples will be collected from the excavation and <br />submitted for laboratory analysis. Samples will be collected as necessary, from the base and side <br />walls of the excavation, to characterize the lateral and, if appropriate, vertical extent of <br />contamination. 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 />• Total petroleum hydrocarbons quantified as diesel and gasoline (TPH-d and TPH-g) in <br />accordance with EPA Method 8015 Modified, and <br />• Benzene, toluene, ethyl benzene and total xylene (BTEX) in accordance with EPA method <br />8020, and <br />• CAM 17 metals in accordance with EPA method 6010B. <br />If any burned areas are encountered during the excavation, soil samples will be analyzed for <br />Polycyclic aromatic hydrocarbons (PAH) in accordance with EPA method 8270, in addition to the <br />above constituents. <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 GeoEnvironmental, Inc. <br />