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r , <br /> SCA BRDA <br /> REMEDIATION <br /> From March through June 1999, weekly groundwater extraction (GWE) was performed on well <br /> RW-1A From July 1999 to June 2000, GWE occurred bi-monthly Beginning June 2000 the <br /> GWE occurred weekly During each GWE event, approximately 5,000 gallons of water is <br /> purged by a vacuum truck and transported to the Martinez Refining Company for recycling On <br /> August 22, 2000 a pump was installed in RW-1A, which pumped into a Baker tank A vacuum <br /> truck emptied the tank and recycled the water as described above During crud-March 2001, the <br /> Baker tank was removed and a vacuum truck was employed to extract groundwater directly from <br /> RW-1A on a bi-weekly basis Vacuum truck events were discontinued after the July 17, 2001 <br /> event, since water is now discharged directly into the sewer system by a permanent groundwater <br /> extraction (GWE) system As of July 17, 2001, approximately 622,649 gallons of water have <br /> been removed from RW-1A As shown on Table 2, based on the concentration data, <br /> groundwater extraction has effectively removed approximately 397 pounds of TPHg, 63 1 <br /> pounds of benzene, and 671 pounds of MTBE <br /> • ANTICIPATED FOURTH QUARTER 2001 ACTIVITIES <br /> Blaine will gauge and sample the site wells according to the updated (details below) sampling <br /> schedule and tabulate the data Cambria will prepare a groundwater monitoring report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected from <br /> the shallow wells this quarter are within the historical norm for this site Wells MW-5 and <br /> RW-1A continue to contain the highest levels of hydrocarbons and MTBE Analytical data from <br /> offsite wells suggests the hydrocarbons and MTBE detected in onsite wells are remaining onsite <br /> None of the domestic wells contained detectable levels of petroleum hydrocarbons or fuel <br /> oxygenates <br /> Cambria recommends continued monitoring and sampling of site monitoring wells to evaluate <br /> concentration trends now that a groundwater extraction system is in operation, full time, at the <br /> site <br /> • <br /> 0783 2 <br />