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AYI <br /> Mr Kyle Chnstie Project 0805-114 04 <br /> • January 29, 1996 <br /> Page 5 <br /> ACTIVITIES PERFORMED DURING THE FOURTH QUARTER <br /> • EMCON performed quarterly groundwater monitoring <br /> • EMCON compiled and evaluated groundwater monitoring data <br /> • In November EMCON replaced the well head vaults for monitoring wells MW-3 and <br /> MW-4 <br /> • EMCON conducted routine operation and maintenance of the remediation system <br /> • EMCON collected air samples from the SVE system to monitor system performance <br /> • EMCON evaluated system performance <br /> ANTICIPATED WORK <br /> • ARCO will continue to perform quarterly groundwater monitoring The next sampling <br /> event is scheduled for February 1996 Because well MW-1 is located at within the <br /> dissolved hydrocarbon plume and one of three wells located upgradient from the <br /> existing tanks, EMCON recommends this well be discontinued from the quarterly <br /> sampling program <br /> • EMCON will complete and submit an addendum to the PAR <br /> • EMCON will prepare a workplan to abandon well MW-8 <br /> • Attempts will be made to improve benzene destruction efficiency <br /> • EMCON will conduct routine operation and maintenance on the remediation system <br /> • EMCON will monitor and optimize the performance of the remediation system <br /> • EMCON will collect air samples from the remediation system for laboratory analysis <br /> CONCLUSIONS <br /> Hydrocarbon concentrations in groundwater underlying the site have declined TPHG and <br /> • benzene concentrations were below laboratory detection limits in wells MW-3, MW-4, <br /> MW-6, MW-7, and MW-8 Dissolved hydrocarbons were detected in wells MW-1, MW-2, <br /> SAC\N\PJ0\08051408W1140 4GS-95\pas 1 <br />