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09/18/2000 17 08 2034671 AGE STOCKTON PAGE 03/05 <br /> S 28 August 2000 <br /> AGE-NC Project No 97-0249 <br /> Page 5 of 10 <br /> • Between 105 and 115 feet north of monitoring well MW-3 to assess the extent of dissolved <br /> petroleum hydrocarbons down gradient of the former UST area <br /> • Between 95 and 105 feet west of monitoring well MW-3 to assess the extent of dissolved <br /> petroleum hydrocarbons down gradient of the former UST area <br /> Between 125 and 135 feet west of monitoring well 1\4W-1 to assess the extent of dissolved <br /> petroleum hydrocarbons down gradient of the former UST area <br /> The proposed ground water monitoring well locations will be advanced to approximately 25 feet bsg <br /> utilizing a truck-mounted, hollow stem dell ng equipped with 8-inch diameter hollow-stein. augers <br /> Total depths of borings may vary according to hydrogeologie/geologic conditions encountered during <br /> drilling Additional monitoring wells may be proposed based on the results of the CPT drilling and <br /> grab ground water sample analysis <br /> 3 4 MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> • Initially, at least six ground water monitoring wells will be installed at the site to assess petroleum <br /> hydrocarbon impacts to shallow ground water Proposed mowtoring well locations are illustrated on <br /> Figure 2 Well locations are proposed to provide definition of the lateral and vertical extent of <br /> dissolved hydrocarbons <br /> Following well installation, each well will be developed to maximize,water flow and minimize the <br /> amount of Pirie-grained sediment drawn into the well during pumping or bailing Procedures for well <br /> installation and development are presented in Sections 4 1 , 4 3 and 4 4, respectively <br /> 3 5 GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Ground water monitoring and sampling activities for each newly installed ground water monitoring <br /> well will be conducted on a quarterly basis unless an alternate schedule or suspension of monitoring <br /> is approved by the PHS-EHD Ground water monitoring activities will include recording depth to <br /> ground water measurements and collection of ground water samples Ground water sample collection <br /> procedures are described in Section 4 6 3 <br /> Ground water samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents <br /> • EPA Method 8015 Modified/5030 for TPH-g and TPH-d, <br /> Advanced CevEnviranmental,Inc <br />