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13 December 1999 <br /> AGE-NC Project No. 98-0433 <br /> Page 2 of 13 _ <br /> Control Board guidelines for the subsurface investigation of underground'storage tanks (UST) sites., <br /> Additionally the scope of work was performed in accordance with the PHS-EHD-approved Work <br /> Plan Addendum for monitoring well installation prepared by AGE, dated 07 May 1998. <br /> 3.1. PROBE BORINGS AND SAMPLING <br /> 1 On 27 and 28 May 1999, a total of 16 soil probe borings (B 1 through B 16) and two `hydro-punch` <br /> boring(B 17 and B 18)were advanced at the site, under observation by the PHS-EHD. Probe borings <br /> were advanced in the area of the former USTs, through the former dispenser islands and northwest <br /> 1 of the former dispensers to collect grab water samples. Probe borings B I and B2 were advanced to <br /> a depth of 30 feet below.surface grade(bsg); borings B3 through 137 and boring B14 were advanced <br /> to 25 feet bsg;' borings B8 was advanced to 20 feet bsg; borings BI 3, B 15 and BI 6 were advanced <br /> ' to 15 feet bsg; and borings B9 through B12 and boring B14 were advanced to 1.0 feet bsg. Locations <br /> of the soil probe borings are illustrated on Figure 2. <br /> Probe borings B 17 and B 18 were advanced to a depth of 20 feet bsg and were sampled at the vadose <br /> zone/ground water interface for ground water. <br /> Probe borings sampled were sam led using a Geoprobe soil sampling device loaded with four 6-inch by <br /> 1.125-inch brass sleeves. Soil samples were collected at five-foot intervals. The second sleeve <br /> collected was covered with Teflon sheets, capped and sealed with tape. All samples were uniquely <br /> labeled. <br /> Collected samples preserved for laboratory analysis were placed in a chilled container,under ice,and , <br /> transported to McCampbell Analytical,Inc.,(MAI)under chain-of-custody. The sampling equipment <br /> was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross- <br /> contamination' <br /> All probe borings were permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings were abandoned by backfilling with cement slurry from the total depth to surface grade. <br /> 3.2. SOIL LOGGING <br /> After sample preservation, soil was extruded from the remaining sleeves and screened utilizing <br /> organic vapor meters (OVMs), one equipped with a photo-ionization detector (PID: Thermo . <br /> Environmental 580A, 10.0 eV, calibrated to isobutylene) and a second meter equipped with a flame <br /> tionization detector(FID);the readings were recorded on the boring logs. The soil was also described <br /> Advancer!G eoEnvi ron mental,Inc. <br />