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30 April 1997 AGE-NC Project No. 96-0209 Page 3 of 5 3.0. SOIL PROBE BORING INVESTIGATION PROCEDURES 3.1. PROBING AND SAMPLING _ Six soil probe borings were advanced on 12 November 1996. figure 2 depicts the locations of the probe borings, PI throutah 116.The probe borings were advanced using AGE's van-mounted Geoprobe 5400 soil probing, machine. Probe borings Pl, P2 and 115 were advanced to a depth of 25 feet, while P; and P4 we_e advanced to 20 feet bsg. Probe boring P6 was advanced under the noilhwestern end of an existlug l.uilding on the site at an angle of 25 degrees from vertical to a lineal depth of 25 feet. Discrete soil saunpics were collected in each probe boring at 5-foot intervals be`inning at a depth of 5 f ect bscy; samples here cnllccted 11sina a 1.375-inch diameter, tvvo-foot long, piston type sampler loadcd with twir Pr - clearied 6-inch brass sleeves. The sampling equipment was washed in an Alconox solution and rinsed with hater prior to each sampling run to minimize cross-contamination. Upon sample retrieval,both ends ofthe second brass sle.evc,,vcre covered with Teflon sheets. capped and scaled with tape. Samples were then placed in a chilled container and transported under ch,1ii1-of- _ custody to McCampbell Analytical, Inc. (MAI) in Pacheco, California. -- 3.2. SOIL LOGGING Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor ttsin`a a photo-ionization detector (PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutylenc). and the readings were recorded on the Boring Logs (Appcttdix A). The soil leas described in accordance with the Unified Soil Classification Svstem. 3.3_ GRAB GROUND NATER SAMPLE COLLECTION Grab ground water samples were collected from probe borings P l and P2 using a Gcoprobe .vatir sampling assembly. Probe rods were extended into around water. then pulled back to expose a%vatcr sampler screen interval. Ground water was allowed to enter the sampler, and samples were retricvL'rl rising a modified PVC tubing bailer. After sample retrieval, the sampler-,vas disassembled and decontaminated between each samplinc; event. New PVC tubing was used for each sample. Samples were collected in 40-ml EPA vil,rls containing hydrochloric acid for sample preservation. The s-,unples were placed in a chilled container and transported under chain-of-custody to MAI for analysis.