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' 28 August. gu 2000 <br />' AGE-NC Project No 97-0249 <br /> Page 5 of 10 <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 MW-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 drill ng equipped with 8-mch diameter hollow-stem augers <br />' Total depths ofbonngs mayvaryaccordmg to hydrogeologic/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 /> At least five ground water monitoring wells will be installed at the site to assess petroleum <br /> hydrocarbon impacts to shallow ground water Proposed monitoring 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 fine-grained sediment drawn into the well during pumping or balling Procedures for well <br /> installation and development are presented in Sections 4 1 , 4 3 and 4 4 , respectively <br /> r <br /> 3 5 GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Ground water monitoring and sampling activities for each newly installed ground water monitoring <br /> I 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 /> groundwater measurements and collection of groundwater samples Groundwater 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 /> 0 EPA Method 8015 Modified/5030 for TPH-d, <br /> • EPA Mdthod 8015 Modified/5030 for TPH-g, <br /> .1 • EPA Method 602 for BTEX, <br /> Advanced GeoEnvironmenW,Inc <br /> I <br />