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24 August 2000 <br /> . AGE-NC Project No 00-0725 <br /> Page 3 of 6 <br />' 2.0. PROCEDURES <br /> 3 1 PROBE BORING AND SAMPLING <br />' On 04 May 2000, five soil probe borings (BI through B5) were advanced at the site under <br /> observation by a representative of the PHS-EHD (Figure 2) The probe bonngs for this investigation <br /> t were advanced using a Geoprobe 5400 soil probing machine, which utilizes direct push technology <br /> to reach the desired sampling depths for retrieval The Geoprobe 5400 and operator were supplied <br /> by EnviroProbe of Anaheim, California <br /> tThe probe borings were advanced in the area of the former USTs (boring B2), in the area of the <br /> southern and central dispenser islands (borings B 1 and 133) and at two locations which are in the <br />' assumed down-gradient location(borings B4 and B5, Figure 2) All borings were advanced to depths <br /> of 20 feet bsg <br />' Soil samples were collected at 5-foot intervals, beginning at a depth of 5 feet bsg from Borings B 1 <br /> through B4 Soil samples were obtained using a pre-cleaned, 13/a-inch diameter 2-foot long, <br />' piston-type sampler(large bore sampler), loaded with four 1-inch by 6-inch brass sleeves After the <br /> sampler was retrieved, the lead brass sleeve was isolated, both ends were covered with aluminum <br /> sheets and sealed with plastic caps The sleeve was then labeled and stored in a chilled container for <br />' subsequent transport to McCampbell Analytical Laboratory (MAI), a California Department of <br /> Health Services (DHS)-certified analytical laboratory, for analysis <br />' Grab ground water samples were collected from all borings The ground water samples were <br /> collected by placing clean PVC screen into the borings The samples were then collected by bailing <br /> the wells with 3/8-inch diameter polyethylene tubing fitted with a bailer fitting The ground water <br />' samples were transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative The vials were then labeled and placed in <br /> a chilled container for transport to MAI <br /> All probing rods, sampling tools and sample liners used for sample collection were thoroughly rinsed <br /> with clean water after washing with a solution of Alconox prior to each sampling run <br /> 3 2 LOGGING , <br />' Soil was extruded from a duplicate sample sleeve and screened for the presence of organic vapor <br /> using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene), and the readings were recorded on the <br /> boring log The soil was then visually described in accordance with the Unified Soil Classification <br /> System (Appendix A) <br />