Laserfiche WebLink
i06 November 2002 <br /> • AGE-NC Project No 95-0137 <br />' Page 2 of 7 <br /> units (effluent stream) using an organic vapor meter (OVM) equipped with a photo-ionization <br /> detector PID (Thermo Environmental 580B, 10 OeV, calibrated to isobutylene 100 ppb) Field <br /> measurements,recorded at regular intervals between 17 July, 19 August and 19 September 2002,are <br /> tsummarized in Table 1 <br /> Soil-vapor samples were collected to document trends in concentrations of hydrocarbon vapor in the <br /> ' soil vapor extracted by the SVE network and to determine the treatment system hydrocarbon <br /> destruction rate Soil-vapor samples from the influent and effluent stream and one inlet sample were <br /> collected in Tedlar vapor bags on 17 July, 19 August and 19 September 2002 using a vacuum pump <br /> ' attached to the influent and effluent stream The samples were labeled,placed in a pre-chilled cooler <br /> and transported under chain-of-custody to transported to McCampbell Analytical Inc (MAI) a <br /> California Department of Health Services (DHS)-certified laboratory in Pacheco, California, The <br /> ' samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> 1Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether <br /> lie <br /> (MTBE) in accordance with EPA Method 8020 <br /> The results of the laboratory analysis are summarized in Table 2 <br /> 2 12 In-Situ Air Sparging Monitoring and Maintenance <br /> ' The EnvioSparge IAS system was monitored and serviced over the last two quarters Regular <br /> measurements of the dissolved oxygen in the ground water wells since the initiation of the <br /> remediation system have shown a low to moderate dissolved oxygen increase in ground water wells <br /> Consequently the spargmg flow rate was adjusted to approximately 4 standard cubic feet per minute <br /> (scfin) and to a pressure of 5 pounds per square inch(psi) <br /> 2 2 QUARTERLY WELL MONITORING PROCEDURES <br /> ' on 19 <br /> Quarterly ground water monitoring activities were conductedSeptember 2002 Ground water <br /> ' monitoring was conducted concurrent with the ground water monitoring event at the Jimco Truck <br /> Plaza located directly north of the site <br /> ' Advanced GeoEnvironmental,Inc <br />