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Page 5 of 6 <br /> 2) The updated Groundwater plan then enabled a <br /> reference basis with the Adjacent Site to narrow the <br /> previously historical wide variation in the Site's <br /> groundwater to a more typical seasonal hydraulic <br /> cycle and consistent with the Adjacent Site's <br /> groundwater flow. (Fig 5 to Fig 11). The most recent <br /> groundwater plan(Fig 5- Q 1-2014) shows an added <br /> dynamic due to the Adjacent Site's dewatering. <br /> 3) Co-GW monitoring was recommended and <br /> accepted for the more accurate mutual benefit of both <br /> Site parties and our common Agency leadership. <br /> 4Q-2014 is the start of the co-monitoring events. <br /> 4) The Q1-2014 Report updated the Site's geology <br /> (Fig 2, Fig by relying primarily on the CPT data <br /> instead of the widely different manual geologic <br /> descriptions by others and by cross referencing the <br /> Site Geology with the Adjacent Site Cross sections. <br /> This update eliminated detail confusion and stylized <br /> the geology for more useful planning for targeting <br /> cleanup of sand-based contamination pathways. <br /> 5) Contamination smear zone tie with the <br /> underground lithology and groundwater fluctuations <br /> was re-assesed using a lithology tied to residual <br /> saturations tied to petroleum hydrocarbon type <br /> (gasoline, diesel, waste oil)on an incremental depth <br /> cross section in order to model approximately the <br /> primary product smear zone's lateral and vertical <br /> extent. The groundwater flow directions were <br /> superimposed to better assess the down gradient <br /> contamination migration flow direction. Refer to Fig <br /> 15 to Fig 25. <br /> 6) Thus the combined product plume Fig 26 was a <br /> composite of gasoline, diesel and waste oil product, <br /> submerged and unsubmerged was influenced by the <br /> site's NE groundwater flow direction, which had no <br /> well control to prove the lateral extent of the product, <br /> which is the significant control gap to complete the <br /> investigation and to move forward to cleanup. <br /> 7) The minimum of two proposed monitoring wells <br /> DW6 and DW7 were proposed for real time current <br /> migration of the product instead of relying on out <br /> dated historical data. Concurrence from EHD. <br /> 8)A proposed strategy to cleanup was presented in <br /> the 1 Q-2014 Report. Concurrence from the EHD. <br /> 10/31/2014 <br />