Laserfiche WebLink
29 September 2003 <br /> AGE-NC Project No. 01-0865 <br /> Page 4 of 10 <br /> • A replacement shallow monitoring well between 5 and 10 feet north of ground water <br /> monitoring well MW-1,which will be abandoned, to continue the assessment of the lateral <br /> extent of dissolved petroleum hydrocarbon-impact up-gradient of the former UST area; <br /> • A shallow well between 45 and 50 feet east of ground water monitoring well MW-1 to assess <br /> the lateral extent of dissolved petroleum hydrocarbon-impact at the former UST area; <br /> • A shallow well between 60 and 75 feet northeast of ground water monitoring well MW-5 to <br /> assess the northern lateral extent of dissolved petroleum hydrocarbon-impact; and <br /> • A shallow well between 65 and 70 feet south of ground water monitoring well MW-2 to <br /> assess the southern lateral extent of dissolved petroleum hydrocarbon-impact. <br /> • A deep-level monitoring well between 45 and 50 feet east of ground water monitoring well <br /> MW-1 to assess the vertical extent of dissolved petroleum hydrocarbon-impact at the former <br /> UST location and up-gradient of MW-6. <br /> A truck-mounted, hollow stem drill rig equipped with 8-inch diameter hollow-stem augers will be <br /> utilized to advance shallow monitoring well borings to approximately 13 feet bsg and deep-level well <br /> boring to approximately 80 feet bsg; the total depths of borings may vary according to <br /> hydrogeologic/geologic conditions encountered during drilling or based on hydrologic unit definition <br /> interpreted from the CPT data. Selected soil samples collected during the boring operations will be <br /> analyzed by a State of California DHS-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br /> Method 8015 Modified; and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) fuel additives including methyl <br /> tertiary butyl ether(MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether(D1PE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME)ethylene dibromide(EDB), <br /> 1,2-dichloroethane (1,2-DCA), methanol and ethanol by EPA Method 8260B. <br /> Laboratory reports for 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 /> 3.4.2. Well Completion,Development and Survey <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 /> Advanced GwEnvironmental,Inc <br />