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09 June 2000 <br /> AGE-NC.Project No.,98-0497 = <br /> Page 5of10 <br /> • Approximately 15 feet west of the former UST cavation. This boring will be advanced at <br /> least 15 feet into first encountered ground waterand completed as a 2-inch diameter-ground <br /> water monitoring well. <br /> Each boring will be advanced utilizing a truck-mounted,hollow.stem drill rig equipped with 8-inch <br /> diameter hollow-stem augers.Total depths ofborings ma vary according to hydrogeologic/geologic <br /> 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 constituen s: <br /> • TPH-d and TPH-g in accordance with EPAMe od $015 Modified/5030; <br /> • BTEX compounds and MTBE in accordance wi h EPA Method'8020; and <br /> • Fuel oxygenated compounds including MTBE,T�A,DIPE;ethyl,tertiary-butyl ether(ETBE) <br /> and tertiary-amyl methyl ether(TAME)by EPA Method 8260 Modified. <br /> Laboratory reports for the soil analyses;testingmethods,I aboratory quality assurance/qualitycontrol <br /> (QA/QC) reports, and sample chain of custody"docum ntation will be presented in a report with <br /> findings and recommendations. . <br /> 3.3. MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> As indicated above; at least three borings will be colnpeted.$s ground water monitoring wells to <br /> assess petroleum hydrocarbon impacted ground_water Proposed-monitoring well locat_ions are <br /> illustrated on Figure 2. <br /> Followingwell 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 .2. and 4.3., respectively. <br /> 3.4. GROUND WATER SAMPLE COLLECTION '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 /> r is approved by the PHS-EHD. Ground water moni.toring, activities will include recording depth to <br /> -groundwater measurements and collection,of ground Water samples.Groundwater sample collection <br /> Advanced GeoEnviron mental,Inc. <br />