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Well Decommissioning and Replacement - 2 - 22 June 2022 <br /> Well Installation Work Plan <br /> Olin Chlor Alkali Facility <br /> Tracy, San Joaquin County, California <br /> COMMENT 2 <br /> Issue: Section 6.0 states the new groundwater monitoring well, MW-17, will be sampled <br /> semiannually for one year. <br /> Required Action: In accordance with the Revised Monitoring and Reporting Program <br /> No. R5-2012-0813-02 issued on 31 May 2022, Central Valley Water Board staff require <br /> the new groundwater monitoring well, MW-17, be sampled semiannually for the first two <br /> years and biennially thereafter. The sampling results will be reported biennially in the <br /> Biennial Monitoring and Sampling Reports. <br /> COMMENT 3 <br /> Requested Action: Central Valley Water Board staff recommend moving the new <br /> groundwater monitoring well, MW-17, northwest of the current location to be closer to <br /> MW-6 and downgradient from the two former pond locations, as shown in red in the <br /> below image. <br /> N <br /> • <br /> Former MW-6, <br /> Pond 1 <br /> � � > MINL. _ <br /> BANTA #2 <br /> MW-3 �� �` ` 'o - 'f <br /> BANTA #300 <br /> COMMENT 4 <br /> Issue: Appendix A, Section A.2.2.1 Monitoring Well Installation states the well screen for <br /> MW-17 will be 20 feet long. The table in Section 4.0 Groundwater Monitoring Well <br /> Installation shows the well screen length is 10 feet long. <br />