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22 July 2002 - - <br /> y — a <br /> AGE-NC Project No. 95'0173 <br /> Page 2 of 2. <br /> 150 feet bsg utilizing 8-inch diameter hollow-stem augers, and completing the.well utilizing <br /> a polyethylene; multi-level well casing-rather.than.a single-completed polyvinylchloride <br /> (PVC) well casing.. `.. <br />_ z <br /> 2. Based on cross section C-C , lithologic barriers {i e. less permeable soils consisting of silts <br /> and clays)'are-apparent atdepths between'75 feet and 95 feet bsg(Hydrologic,Unit 4), 105 <br /> and 115 feet bsg(Hydrologic Unit 6)'and between 130 and '135 feet bsg(Hydrologic Unit S). <br /> Furthermore,petroleum constituents have been detected in grab water samples to depths of -" <br /> 140 feet bsg during the previous CPT investigation.Therefore, AGE.recommepds replacing <br /> the existing`screeri<interVai with a-new screen interval -at 95 feet. to 100 feet bsg, and = <br /> installing new screen intervals between the apparent lithologic.barriers at depths between 120. . = . <br /> feet to 125 feet bsg and'.145 to.150 feet bsg. A revised monitoring well construction diagram <br /> is included with this letter. 3 4 <br /> If you have any questions or require further.information,please contact our office at'(209)467-1006. -- <br /> Sincerely; <br /> Advanced GeoEnvironmental, Inc. <br /> Timothy J. Cuellar <br /> Project Geologist <br /> Enclosures - " - <br /> cc: Mr:David Atwater=- Van-De Pol Enterprises,:1-ne; = - <br /> or <br />