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. 30 December 1997 <br /> AGE-NC Project No 97-0343 <br /> Page 3 of 6 <br /> 3.0. PROCEDURES <br /> 3 1 PROBING AND SAMPLING <br /> On 18 September 1997, five soil probe borings (probings) were advanced at the site using AGE's <br /> Geopiobe 5400 probing unit equipped with 1 25-inch diameter probe rods and a 2 15-inch diameter <br /> soil sampling assembly Probing B1 was advanced in the apparent former UST excavation, as <br /> indicated by cut patterns on the pavement, probings B2 and B5 were advanced south and north of <br /> the apparent former UST excavation, respectively,and probings B3 and B4 were advanced east of <br /> the apparent former UST excavation Probing B I was advanced to 65 feet bsg, and probe borings <br /> B2, B4 and B5 were advanced to 30 feet bsg, and probing B3 was advanced to 35 feet bsg Probe <br /> boi ing locations are shown on Figure 2 <br /> Soil samples were collected at 5-foot intervals, beginning at 5 feet bsg, to the total depth of each <br /> probing, excluding probing B1 at 65 feet bsg All samples were collected using the Geoprobe soil <br /> sampling assembly loaded with four 1 125-inch by 6-inch brass sleeves After collection, the ends <br /> of the second brass sleeve were covered with aluminum sheets, capped and sealed with tape The <br /> sleeves were labeled, placed in a chilled container and selected samples were transported under <br /> chain-of-custody to McCampbell Analytical Inc (MAI), a state-certified analytical laboratory, in <br /> Pacheco, California <br /> After encountering refusal in probing B1 at 65 feet bsg, an attempt was made to obtain a grab water <br /> sample, however, water could not be retrieved The remaining probe borings did not achieve <br /> sufficient depth to attempt collection of a grab water sample <br /> All probing rods, sampling tools and sample liners used for sample collection were thoioughly rinsed <br />` with clean water after washing with a solution of Alconox between each sampling run All probings <br /> were backfilled over their entire depth with portland cement, using a treinmie pipe <br /> 32 LOGGING <br /> Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br /> using an organic vapor meter equipped with ,a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 OeV, calibrated to isobutylene), the ieadmgs were recorded on the boring <br /> logs Soil was described in accordance with the Unified Soil Classification System(see Boring Logs, <br /> Appendix A) <br /> • <br /> Afi=alrcedGeoE.nviranmental,Inc <br />