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L Blatt Commercial Brokers e� <br /> 9 4 <br /> April 30, 1990 <br /> L202/899-7041 <br /> LGROUNDWATER MONITORING <br /> Groundwater was monitored to determine the static groundwater level. The groundwater level was <br /> L measured using an interface probe, consisting of a dual optical sensor and electrical conductivity probe. <br /> The static groundwater depth measured at the site on April 23, 1990 was 10.27 feet below ground surface. <br /> GROUNDWATER SAMPLING <br /> LOn April 20, 1990, following the drilling operation,on, the well was developed using hand bailing <br /> methods to remove fine particulates and to accelerate proper settling of the sand pack. Groundwater <br /> collected during well development was stored on site in DOT-approved containers for later disposal by <br /> LBlatt Commercial Brokerage. <br /> On April 23, 1990, approximately nine gallons of water was purged from the well. Following <br /> Lpurging, a groundwater sample was collected with an EPA-approved TeflonR sampler and placed in a 500 <br /> milliliter(ml) plastic bottle. Nitric acid (HNO�was added to the water sample to lower the pH of the water <br /> Lbelow 2. The 500-ml plastic bottle was then capped, labeled, preserved on ice, and delivered with the <br /> appropriate Chain-of-Custody manifest to GTEL for subsequent analysis. The groundwater sample from <br /> the well was analyzed for total copper and total lead using methods from the EPA 6010/7000 Series. <br /> SUBSURFACE CONDITIONS <br /> Soils encountered beneath the site consist of brown,stiff clay with minor silt as shown on the drill <br /> log in Appendix II. Initial depth to groundwater encountered in SBA (MW-1) during the drilling operation <br /> was 12 feet below ground surface. The static groundwater level measured in MWA on April 23, 1990 was <br /> L10.27 feet below ground surface. <br /> LRESULTS OF CHEMICAL ANALYSES <br /> SOIL <br /> L <br /> Three soil samples were submitted to the laboratory for analysis of copper and lead. Table 1 lists <br /> the soil samples submitted for chemical analysis, the depths at which they were collected, and their <br /> L corresponding copper and lead concentrations in parts per million (ppm). <br /> ❑�®GROUNDWATER <br /> ❑❑❑ TECHNOLOGY,INC. <br /> L <br />