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21 July 1999 AGE-NC Project No. 99-0611 Page 2 of 4 2.2. SOIL SAMPLE COLLECTION AND ANALYSIS AGE proposes to advance up to 4 soil probe borings at selected areas of potential environmental concern. The proposed soil probe boring locations are shown on Figure 2. One probe boring will be advanced adjacent to the secondary enclosure for a large crushing machine. Two soil probe borings will be advanced adjacent to two former fuel tanks, and one soil probe boring will be advanced in an area of disturbed concrete. Cause or purpose for the disturbed concrete is unknown, but the concern is for the former presence of an underground storage tank (UST) or sump. The three soil probe borings advanced adjacent to the enclosed crusher, the disturbed concrete and the western former fuel tank will be advanced to a depth of 15 feet below surface grade (bsg). The eastern former fuel tank is now covered by the northwest corner of the building on the property, so AGE plans to advance a soil probe boring at a 20' angle under the building to a depth of 20 feet bsg. Soil samples will be collected from each probe boring at five-foot intervals from ground surface to the total depth of the boring. Soil samples will be selected for laboratory analysis based on field observations of hydrocarbon staining and odor, as well as screening using an organic vapor meter (OVM). Field procedures for advancement of probe borings and collection of soil samples are presented in Sections 3.1 and Section 3.2, respectively. Selected soil samples will be analyzed by a California Department of Health Services (DHS)- certified laboratory for the following constituents: • Total petroleum hydrocarbons (TPH-all) by EPA Method 8015 Modified/5030; and • Chlorinated hydrocarbons by EPA Method 8010. Each of the selected soil samples will be analyzed for TPH-all. Additionally, one soil sample collected form the area of the disturbed concrete will be analyzed for the chlorinated hydrocarbons. Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. 2.3. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report will be prepared presenting the findings of the investigation. The report will include a description of the work performed and results of the sampling and analysis. Conclusions and applicable recommendations Advanced GeoEnvironmental,Inc.