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' 12 February 1999 AGE-NC Project No 98-0452 ' Page 2 of 4 ' soil probing unit equipped with 1 125-Inch diameter probe rods and a 2 15-Inch diameter soil sampling assembly The Geoprobe and one-man crew were supplied by Fisch Environmental Exploration Services of Valley Springs Probings B I and B2 were advanced to a depth of 20 feet ' bsg Probings B3, B4 and B5 were advanced to a depth of 15 feet bsg Probe boring locations are shown on Figure 2 ' Soil samples were collected at five-foot intervals using the Geoprobe soil sampling assembly loaded with a 1125-inch by 2-foot acetate sleeve After collection, an approximately six-inch soil-filled section of the sleeve was cut and preserved by covering the ends with aluminum sheets, capping and ' sealing with tape ' FolIowing the collection of each 15-foot-bsg soil sample, a grab water sample was collected from the active boring Slotted PVC casing was inserted into the open borehole A modified bailer consisting of Teflon tubing and a check valve were inserted through the casing and used to bring the ' samples to the surface Each grab water sample was transferred into 40-mI VOA vials containing 0 5 mI 18% hydrochloric acid as a sample preservative and into one-liter amber bottles All soil and water samples were labeled, placed in a chilled container and selected samples were transported '! under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco, California, a state of California Department of Health Services (DHS)-certified laboratory ' All probing rods and sampling tools used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox between each sampling run All probings were backfilled over their entire depth with portland cement, using a tremmie pipe I 32 LOGGING The remainder of the acetate sleeve was cut open for examination A sample of the soil was screened I for the presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector (PTD Thermo Environmental 580A, 10 OeV, calibrated to isobutylene), and the readings were recorded on the boring logs Soil was visually described in accordance with the Unified Soil Classification System (Boring Logs, Appendix A) I3 3 LABORATORY ANALYSIS Soil samples collected from depths of 5 and 10 feet bsg and the grab water samples collected from each probing were analyzed for • Total petroleum hydrocarbons quantified as gasoline TPH- and diesel TPH-d in Advanced Gcoun.iron mcatal,Inc I