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1 <br /> Coca-Cola Enterprises - West <br /> USTEC Job No 90054 03 <br /> 21 DRILLING PROCEDURES <br /> Four borings were advanced by Westech Environmental Drilling Inc, Sante Fe Springs, <br /> ICalifornia, from ground surface to depths ranging from 46 to 68 feet using a truck-mounted <br /> (Photograph No 1) or trailer-mounted (Photograph No 2) drilling ng equipped with 10-inch <br /> O D continuous flight hollow stem augers Bonng 25 was completed as a vapor extraction well <br /> to a depth of 68 feet for remediation of petroleum hydrocarbon contaminated soils in the lower <br />' contaminated zone Borings 26, 27 and 28 were completed as vapor extraction wells to a depth <br /> of about 48 feet to remediate the petroleum hydrocarbon contaminated soils in the upper <br /> I contaminated zone The upper and lower contaminated zones are characterized in the <br /> Contamination Assessment Report (CAR) dated November 30, 1990 A summary of the vapor <br /> extraction well construction details is presented in Table 1 These wells were labelled VEW-5 <br /> through VEW-8 and are presented on Figure 2 Soils generated during the drilling process were <br /> I stored in U S Department of Transportation (DOT) approved 17-H, 55-gallon steel drums <br /> Groundwater was not encountered in any of the borings Soil samples were not collected during <br /> the installation of the VE wells because of the close proximity to other previously sampled <br /> borings <br /> 22 ORGANIC VAPOR MONITORING <br /> Soil vapors were monitored in each boring with an HNU model PI-101 photoionization detector <br /> (PID) equipped with a 10 2 electron volt (eV) lamp For each sample interval a grab sample was <br /> collected and transferred to a labeled resealable plastic bag The sample was disaggregated and <br /> Iallowed to stabilize under ambient conditions for a minimum of 15 minutes The HNU probe <br /> was then inserted through the seal of the plastic bag into the "headspace" above the soil sample <br /> IThe highest readings were recorded on the stratigraphic logs which are presented in Appendix <br /> A A summary of the HNU results is presented in Table 2 <br /> I <br /> 23 VAPOR EXTRACTION WELL INSTALLATIONS <br /> IVapor extraction wells were installed upon completion of drilling operations for each boring <br /> The locations of these wells is depicted on Figure 2 The vapor extraction wells were constructed <br /> Iwith single string of 4-inch O D Schedule 40 flush-threaded Polyvinyl Chlonde (PVC) well <br /> 2 <br /> 1ST <br /> I <br />