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09 April 2002 <br /> . AGE-NC Project No 95-0141 <br /> Page 6 of 13 <br /> • One "clustered" well approximately 70 feet northeast of monitoring well MW-6, <br /> • One "cluster" well approximately 50 feet southeast of monitoring well MW-7, and <br /> • One deep well approximately 5 feet east of monitoring well MW-8 <br /> Ground water monitoring well locations and screen intervals of the wells are proposed to provide <br /> definition of the extent of dissolved hydrocarbon impact in both first encountered and deeper ground <br /> water Intervals as well as providing a means to monitor the vertical extent of hydrocarbon <br /> contamuiation Screen intervals of the "deep" wells will be based on findings from the CPT <br /> investigation and the findings of previous Investigations If multiple potential contaminant migration <br /> pathways are encountered, additional monitoring wells may be needed Proposed monitoring well <br /> locations are illustrated on Figure 2 Generalized monitoring well designs are illustrated on Figures 8 <br /> and 9 <br /> The pilot borings for the proposed ground water monitoring wells will be advanced to approximately <br /> 30 feet bsg for the shallow wells and 65 feet bsg for the deeper screened wells utilizing a truck- <br /> mounted, hollow stem drill rig equipped with 8 25-inch diameter hollow-stem augers Soil samples <br /> will be collected utilizing a California split-spoon soil sampler Total depths of borings may vary <br /> according to hydrogeologic/geologic conditions encountered during drilling <br /> Selected soil samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents <br /> E0 TPH-g in accordance with EPA Method 8015 Modified/5030, <br /> • BTEX, MTBE, TBA, TAME, DIPE, and ETBE by EPA Method 8260B, and <br /> • EDB and 1,2-DCA by EPA Method 8260B <br /> Laboratory reports for soil sample analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations <br /> 3 4 2 Ground Water Extraction Well <br /> As part of site remediation feasibility testing, AGE proposes installing one 4-inch diameter ground <br /> water extraction well at the former UST location A drill rig equipped with 10-inch diameter hollow- <br /> stem augers will be utilized to advance a pilot soil boring at the former UST location (near <br /> • <br /> Advanced GeoEnvironmental,Inc <br />