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n <br /> Mr Kyle Christie <br /> August 24, 1995 <br /> Page 5 <br /> • on the data the system was reconfigured, resulting in an increase in the removal rate of <br /> TPH-G and benzene per day Figure 3 presents the vacuum influence data for the wells that <br /> were in operation after the vapor influence study During the second quarter, the system <br /> extracted and treated approximately 893 pounds of TPH-G and 14 1 pounds of benzene, an <br /> increase of 54 5 percent over the last quarter Table 5 presents a summary of the S VET <br /> system data and Table 6 summarizes the status of the individual soil vapor extraction and air <br /> sparging wells <br /> The AS system was not operating from May 30, 1995 to June 8, 1995 while the cooling <br /> system pump was rebuilt Currently, the AS system is operating within design parameters and <br /> delivers an average of 3 4 cfm of sparge air into individual air sparge wells Air sparge well <br /> data is presented in Table 6 As required by San Joaquin County, dissolved oxygen data is <br /> being collected on selected monitoring wells Dissolved oxygen data is presented in Table 7 <br /> Monitoring of dissolved oxygen levels in selected monitoring wells will continue on a bi- <br /> weekly basis as required by the County <br /> Recommendations <br /> Brown and Caldwell, on behalf of ARCO, will place wells E-3, E-4, E-5, E-6, E-7, PR-1, <br /> PR-2, BHD-2, MW-1, MW-2, and MW-3 on a semi-annual sampling schedule The wells will <br /> be sampled during the second and fourth quarters of each year These wells are either <br /> . upgradient, cross gradient, or provide similar data gained from nearby wells which are <br /> sampled quarterly Depth-to-groundwater data will still be collected from these wells on a <br /> quarterly basis <br /> SUMMARY OF WORK <br /> Work Completed in Second Quarter 1995 <br /> • Continued monitoring of the GWES, including sampling of the system <br /> • Submitted first quarter 1995 groundwater monitoring and remediation system <br /> evaluation report <br /> • Sampled site groundwater monitoring wells for second quarter 1995 Sampling <br /> performed by EMCON <br /> • Repaired leak discovered in product piping lines at pump islands (actually occurred <br /> at beginning of third quarter, 1995) <br /> • Submitted wastewater discharge reports to the City of Stockton <br /> • Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 2V,(), .P0RTSI2`ND95QTR RPT <br />