ARCHIVED REPORTS XR0000123 - Laserfiche WebLink

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of petroleum impact in groundwater Therefore, with the concurrence of the EHD, new sparging well SP-A was drilled and completed on March 14, 2002 Under permit from the EHD, Spectrum Drilling completed air sparging well SP-A with a hollow-stem auger drill rig to a depth of 72 feet Well SP-A was ' constructed with 70 feet of 3/4-inch diameter, Schedule 40 PVC casing connected to a 2-foot long Filtros ceramic air diffuser The annular space was filled with a sand filter pack to about 5 feet above the air diffuser, topped by about 5 feet of bentonite pellets and 60 feet of cement grout The well was completed flush with the ground surface and is protected by a lockable steel cover A well construction diagram for SP-A is contained in Appendix A ' New sparging well SP-A was placed within the area of highest groundwater impact, about 10 feet southwest of well MW-1 (see Figure 2) Air sparging 1 into SP-A is performed by supplying an approximate volume of 5 standard cubic feet per minute (scfm) Venting is performed by withdrawing an approximate volume of 25 to 35 scfm of soil gas from well VW-1 Soil gas is treated initially through a primary 1,000 pound granular activated carbon (GAC) adsorber and then through a secondary 160 pound GAC adsorber Permits to operate the remediation system and emit treated air have been obtained from the San Joaquin Air Pollution Control District (SJAPCD) Emission reports are routinely submitted to the SJAPCD The system is monitored weekly to ensure efficient operation and permit compliance A summary of days of system operation, recovered vapor concentrations and total pounds of removed contaminant is included in Table 7 of this report Table 7 was developed to demonstrate compliance with the system air emissions operating permit and to provide information concerning remediation effort Soil vapor concentrations of the influent and effluent ' streams, observed from the weekly laboratory analysis of vapor samples, is reported in the Table 7 columns labeled C(inf) and C(eff), respectively Soil vapor extraction flow rates are labeled Q(inf) and Q(eff) The total pounds of contaminant removed by the soil vapor extraction system are tabulated under the PE columns April 2002 Groundwater Monitoring And ' Air Spargmg Well installation Report The Farthgrains Baking Company 2651 South Airport Way Stockton,California Prepared for THE EARTHGRA[Ns BAKING COMPANY Prepared by Philip Services Corp H TNV1624001321121382EGV5imktonlStockton10402mon d« May 21 2002