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' 29 June 1999 <br /> . AGE-NC Project No 97-0290 <br /> Page 3 of 7 <br /> 44 5 feet bsg <br /> Three vapor monitoring points were installed with each sparging well Each vapor point was <br /> constructed with 1/2-inch diameter PVC pipe Approximately six inches of the end of the piping was <br /> slotted using a band saw with blank piping extending to the surface The lower perforated section <br /> was installed within a sand pack placed from 44 5 to 43 feet bsg A two-foot bentonite plug was <br />' installed from 43 to 41 feet bsg and hydrated Portland cement was installed from 41 to 33 5 feet bsg, <br /> using a tremm;e pipe to avoid smearing cement on the boring wall Additional vapor points were <br /> installed with sand packs from 33 5 to 32 feet bsg and from 20 5 to 19 feet bsg with the above <br /> described procedures The portland cement was allowed to set between the installation of each vapor <br /> point The final cement grout seal was installed from approximately 17 feet bsg to near the surface <br />' A water-tight, traffic-rated well box was installed over each well Well constructions are described <br /> on the boring logs (Appendix A) The well locations are shown on Figure 2 <br /> 24 LABORATORY BO TORY ANALYSES OF SOIL SAMPLES <br />' Selected soil samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030 and 8015m; and <br /> • Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes, BTEX) <br /> in accordance with EPA Method 8020 <br />' <br /> 25 MONITORING WELL PURGE PROCEDURES <br />' On 30 April 1999, a Sollnst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW 1 through MW8, relative to the tops of the well casings The ground water <br />' elevations and gradient were determined from these data(Table 2) <br /> After recording water level measurements, a PVC bailer was used to remove sediment from MW8 <br /> A two-stage submersible pump was then used to purge each monitoring well of standing water and <br /> to develop MW8 Approximately 6 to 8 gallons of water were removed from MW1 through MW7, <br /> approximately 20 gallons of water was removed from MW8 <br /> . Ground water temperature, pH and conductivity were measured at regular purge-volume intervals <br /> during purging using an ICM water analyzer Dissolved oxygen was measured using a YSI model <br /> I <br /> Advanced GeoEnvironmentel,Inc <br /> I <br />