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i I19 November 1999 AGE-NC Project No 99-0657 IPage 4 of 10 will be clearly marked and a utility clearance obtained through Underground Service Alert The PHS-EHD will be contacted a minimum of 48 hours prior to conducting investigation activities I32 SOIL SAMPLE COLLECTION AND ANALYSIS I Initially, AGE proposes to advance four soil probe borings in the vicinity of the former USTs and the dispenser island to evaluate the lateral and vertical extent of the petroleum hydrocarbon impacted soil Proposed probe boring locations are illustrated in Figure 2 One soil probe boring is proposed to be advanced near the location of the fanner USTs aithin the center of the former UST excavation to assess the vertical extent of impacted soil and to assess the impact to ground water, if any A second boring will be advanced near the former dispenser island to evaluate the vertical extent of petroleum hydrocarbons detected in a soil sample collected during UST removal A third soil boring will be advanced in the assumed down-gradient direction (south- southwest) of the former USTs and dispenser island A fourth soil boring is proposed to be advanced directly north of the former UST location Soil probe borings are proposed to be advanced to depths of approximately 35 feet bsg However, total depths of probe borings will be based on field observations and field screening using an of ganic I vapor monitor (OVM) Soil samples will be collected from each probe boring at five-foot intervals from ground surface to the total depth of the boring Field procedures for advancement of probe borings and collection of soil samples are presented in Sections 4 1 and 4 2, respectively IUp to twelve soil samples, three soil samples from each soil probe boring, will be submitted for laboratory analysis Selected soil samples will be analyzed by a California Department of Health Services (DHS)-certified laboratory for the following constituents • TPH-g by EPA Method 8015 Modified/5030, • TPH-d by EPA Method 8015 Modified/5030, • BTEX by EPA Method 8020, and • Fuel oxygenating compounds including methyl tert-butyl ether (MTBE), di-Isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME) and tertiary butyl alcohol (TBA) by EPA Method 8260 I Laboratory reports for soil analyses, testing methods, laboratory duality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with . findings and recommendations Advanced GeoEnvironmental,Inc I