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k'9 KLEINFELDER estimated to be 10 feet in diameter or less. Four borings were hand augered in and around the stained soil. Three soil borings were advanced around the perimeter of the stained soil to an approximate depth of 10-feet below surface grade (bsg). A single soil boring was advanced in the central portion of the stain, to a total depth of approximately 14-feet bsg. No obvious hydrocarbon-like odor was noted in soil collected from the perimeter borings. A strong to moderate hydrocarbon-like odor was noted in soils collected from 2, 5 and 10-feet in the boring advanced in the central portion of the stained soil. However, no obvious odor was noted from a soil sample collected from this boring at approximately 14-feet bsg. A organic vapor analyzer (OVA) was used to screen the soils from the four soil borings. Soil screening of soil collected at 5 and 10 feet bsg in the three perimeter borings showed readings of less than 1 part per million (ppm) ionizable compounds in the air. Soil screening of samples collected from the fourth boring (within the stained soil) at depths of about 2, 5, 10 and 14-feet bsg showed OVA readings of 50.1, 24.6, 17.5, and 4.0 ppmv, respectively. III. SCOPE OF WORK Task 1 - Workplan Preparation and Permitting A workplan which details the scope of work, will be submitted to PHS/EHD for review and authorization. An authorization to proceed, by PHS/EHD, will be required prior to conducting the scope of work. Task 2 - Soil Excavation observation and Sampling Kleinfelder will observe the estimated excavation of a 10-foot diameter by 15 foot deep area in the vicinity of a former AGST. The soil will be excavated using a backhoe supplied by DSS of Stockton, California. At this time, and for purposes of the attached cost estimate, approximately 50 cubic yards of soil or less is estimated to be excavated and stockpiled. The stockpiled soil will be placed on and covered by visqueen. A total of six soil samples will be collected. Five confirmation soil samples and one four-point composite sample. The five confirmation soil samples will be collected within the excavation, four of which will be collected from soil collected from the sidewalls. One confirmation soil sample will be collected from the bottom of the excavation. The 4-point composite soil sample will also be collected from the stockpiled soil. The soil samples will be collected by driving a 6-inch stainless steel tube into the soil by hand. The soil samples collected from within the excavation will be collected from the bucket of the backhoe. The stainless steel tubes will be removed from the soil and the ends sealed with Teflon tape and tightly fitting plastic caps. The samples will be placed immediately into a iced cooler. 20-YP7-208/2017P I 57/2017C344 Page 2 of 7 1D 1997 Kleinfelder, Inc. November 6, 1997