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September 30, 2015 Monitoring Well Abandonment and <br /> Installation Workplan <br /> Table I <br /> Construction Information for Monitoring Wells to be Abandoned. <br /> Diameter Depth screened <br /> Well ID Year Drilled Interval Proposed Action <br /> (inches) (feet bls) <br /> (feet bls) <br /> KMW-1 2001 4 30 8-30 Destroy <br /> KMW-3 2001 4 30 10-30 Destroy <br /> 1.5. Proposed Replacement Monitoring Well Installation <br /> Replacement monitoring wells may be required to monitor the effectiveness of the Salinity <br /> Mitigation Plan. Second Quarter 2015 water levels in the WWTF and CTF monitoring wells <br /> and groundwater elevation contours are shown on Figure 2.7 If required,the abandoned <br /> wells shall be replaced by installing one new monitoring well(KMW-10)along the western <br /> edge of LAS-2 and one new monitoring well (KMW-11) along the northern edge of LAS-1 <br /> (Figure 3). The KMW-3 replacement(KMW-10) location was chosen due to its <br /> downgradient location from KMW-3 and future sampling access at the edge of LAS-2.The <br /> KMW-1 replacement(KMW-11) location was chosen due to its close location td KMW-land <br /> future sampling access at the edge of LAS-1. <br /> Table 2 summarizes current and proposed functions of the wells in the WWTF monitoring <br /> network. <br /> TableCurrent and ... <br /> Well ID Current Function Proposed Function <br /> KMW-1 LAS-1 compliance To be destroyed <br /> KMW-2 LAS-2&-3 compliance Continued monitoring at LAS-2&-3 <br /> KMW-3 LAS-2 compliance To be destroyed <br /> KMW-4 LAS-3 compliance Percolation pond compliance <br /> KMW-6 Background Percolation pond compliance <br /> KMW-8 Percolation pond compliance Percolation pond compliance <br /> KMW-9 Percolation pond compliance Percolation pond compliance <br /> KMW-10 To be installed Monitoring at LAS-2 <br /> KMW-11 To be installed Monitoring at LAS-1 <br /> MW-5 Pond A, B, C compliance Pond A, B, C compliance <br /> W-1 Pond A, B,C compliance Pond A, B, C compliance <br /> W-2 Pond A, B, C compliance Pond A, B, C compliance <br /> Table 3 summarizes construction information for the proposed new replacement wells that <br /> will be used to monitor LAS-1 and LAS-2,if required. KMW-10 and KMW-11 shall be <br /> installed with provided protection for any site construction activities. <br /> 7 Hydro Focus, Inc.City of Lathrop Second Quarter 2015 Groundwater Monitoring Report,Crossroads <br /> Wastewater Treatment Facility Order No.5-01-251.July 31,2015. <br /> HydroFocus, Inc. 3 <br />