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' Corrective Action Flan <br /> Montgomery Ward Auto Service Center, Stockton, CA <br />' ■ Ease of Implementation <br /> A number of the existing on-site wells can be used as ground water extraction <br /> wells Therefore, the only additional installation required will be the installation of <br />' the piping necessary to connect the wells to the treatment compound, the installation <br /> of a treatment compound and the installation of a pump-and-treat equipment in the <br /> treatment compound These steps will not significantly impact on-site operations <br /> Therefore, ease of implementation for this method is very favorable Thus, a grade <br /> of 8 was assigned to this criteria for this remedial alternative <br /> ■ Availability of Space <br />' The only aboveground space required for this method is an area (approximately 15 <br /> feet by 15 feet) to locate the pump-and-treat ground water extraction system All <br />' other appurtenances are below ground Therefore, space is not a problem and is an <br /> advantage to this method Thus, a grade of 10 was assigned to this criteria for this <br /> remedial alternative <br />' ■ Disru tion to Facility O erations <br /> As in the case of soil vapor extraction, implementation of this method is not <br /> expected to pose any significant disruption to operations The construction <br /> activities required to complete this method, e g , installation of underground piping <br /> to connect the wells to the treatment system and setup of the treatment system will <br /> not significantly impact on-site operations Therefore, this method would not be <br /> very disruptive to the day-to-day operations for the Montgomery Ward facility <br /> Thus, a grade of 9 was assigned to this criteria for this remedial alternative <br /> Time of Completion <br /> It is difficult to estimate the exact time needed for achieving ground water cleanup <br />' goals using pump-and-treat However, past experience suggests that pump-and- <br /> treat is usually a multi-year proposition and rarely achieves cleanup goals Thus, <br /> time of completion is a big disadvantage of this method Therefore, a grade of 4 <br /> was assigned to this criteria for this remedial alternative <br /> ■ Cost of Implementation <br />' Table 16 provides details on the cost estimate ($400,630) to install and operate a <br /> pump and treat system for two years However, given the uncertainties associated <br /> with this method, it may take up to five years ($650,680) to complete Therefore, <br /> a grade of 4 was assigned to this criteria for this remedial alternative <br /> ■ <br /> AT)121icability to Soil Remediation <br />' Pump-and-treat can be run in parallel to soil vapor extraction Under certain <br /> conditions such as application of high vacuum, the drawdown created by pump-and- <br /> trct11 1-.01.. ll.ao�r�n4nrsoil 1ir%rV7r%"C tsliat ca.n then bP rleaned lip effeC`tiVely using <br /> aL W111 llelp lL4 YY 4LVL 0V1 11V 1J./..rV AtJ <br /> high-vacuum vapor extraction However, both vapor extraction and pump-and-treat <br /> are mutually exclusive options and can be implemented independently Therefore, <br /> a grade of 6 was assigned to this criteria for this remedial alternative <br /> Project No 1232 - 17 - <br /> 1 SAH WORD 1232CAP <br />