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i <br /> i <br /> 15 January 1998 <br /> AGE-NC Project No 96-0254 <br /> Page 9 of 16 <br /> i <br /> i <br /> 3 4 MONITORING WELL INSTALLATION <br /> 3 4 1 Soil Sampling Collection and Analysis <br /> Two soil borings will be advanced as pilot borings for collection of soil samples and the installation <br /> of ground water monitoring wells The purpose of the monitoring wells are to <br /> • Assess petroleum hydrocarbon impacts to ground water along the northeast edge of the site, <br /> • Assess the vertical extant of hydrocarbon impacted water north of the former UST area, <br /> • Enhance the ground water monitoring network <br /> As shown on Figure 2, one of the proposed ground water monitoring wells (PMW 1) is located <br /> approximately 45 feet north of soil boring B9 A grab ground water sample from B9 was impacted <br /> by petroleum hydrocarbons, indicating that a more down-gradient site for the well would be more <br /> likely to be near the plume margin The location of the proposed monitoring well is on an adjacent <br /> site, but the site is owned by the same owner as the subject property The second proposed ground <br /> water monitoring well (PMW2) is to be located directly north of well MW-1 PMW1 will be <br /> advanced to an approximate depth of 30 feet bsg PMW2 will be advanced to a minimum depth of <br /> 40 feet bsg Upon installation, each monitoring well will be given a designation conforming to the <br /> well-designation system currently utilized on the site <br /> Soil samples will be collected from each monitoring well pilot boring at five-foot intervals from five <br /> feet bsg to the total depth of the boring Field procedures for advancement of soil borings and <br /> collection of soil samples are presented in Section 4 2 1 A total of up to six soil samples, a <br /> minimum of two samples from each soil boring,will be submitted for laboratory analysis Selected <br /> soil samples will be analyzed by DHS-certified Iaboratory for the analytes noted in section 3 3 <br /> above <br /> Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations <br /> 3 4 2 Monitoring Well Installation and Development <br /> PMW 1 will be a dual-completed well ground water monitoring well and will consist of a 10-foot <br /> screen section with five feet of screen extending above the water table(5 feet bsg to 15 feet bsg) and <br /> a lower five-foot well screen set from 25 feet bsg to 30 feet bsg <br /> /1/"p _ Z Advanced GeoEnvironmental, lint <br /> LL , <br />