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21 August 2000 <br /> • AGE-NC Project No 97-0343 <br /> Page 5 of 9 <br /> The proposed ground water morntonng well locations will be advanced to approximately 55 feet bsg <br /> utilizing a truck-mounted,hollow stem drill ng equipped with 8-Inch diameter hollow-stem augers <br /> Total depths of borings may vary according to hydrogeologic/geologic conditions encountered during <br /> 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 /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g, TPH-d) in <br /> accordance with EPA Method 8015 Modified/5030, <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) compounds in accordance with <br /> EPA Method 8020 <br /> Laboratory reports far the soil analyses,testing methods,laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations <br /> 3 3 MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> At least four 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 assess the lateral and vertical extent of dissolved <br /> 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 bailing Procedures for well <br /> installation and development are presented in Sections 4 1 , 4 3 and 4 4 , respectively <br /> 3 4 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 /> groundwater measurements and collection of groundwater samples Groundwater sample collection <br /> procedures are described in Section 4 6 3 <br /> i <br /> Advanced GeoEnvtro n mental,Inc <br />