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Mr.C.Dean Hubbard—Central Valley RWQCB 29,2014 <br /> Annual 2014 Groundwater Monitoring and Sampling Report April page 7 014 <br /> Alden Park <br /> of 7 <br /> With the exception of a few inches measured in MW-5,the SPO plume has shown little <br /> variation since 1997,when consistent collection of SPO measurements started, and is <br /> considered stable. <br /> ' Leidos recommends the following: <br /> • Continue annual groundwater monitoring and sampling of the wells that do not <br /> contain SPO or sheen using HydraSleeve samplers. <br /> • Continue quarterly extraction of SPO from the remaining wells via vacuum <br /> extraction. <br /> ' • Perform gauging of SPO thickness on an annual basis. <br /> • Continue SPO recovery from MW-21 using an oleophilic sock and replace the <br /> sock on an as-needed basis. <br /> CLOSING <br /> ' If you have any questions regarding this report,please call Will Slowik at(559) 638-7655 <br /> or Michael Hurd at(510) 466-7161. <br /> 1 Sincerely, <br /> Leidos Engineering, LLC <br /> W����1MICHAEL KURDli Xam Slowik Michael Hurd, CHG 0068 E 0068 <br /> WilliCERTIFIED <br /> Environmental Project Manager Senior Project Manager HYDROGEOLOGIST <br /> EXP. �" �P <br /> Enclosures: �QrF OF CIN1�F�¢� <br /> Figure 1. Vicinity Map <br /> Figure 2. Site Map <br /> Figure 3. Potentiometric Surface—March 28,2014 <br /> ution in Groundwater—March 28, 2014 <br /> Figure 4. Petroleum Hydrocarbon Distrib <br /> Table 1. Water-Level Elevation Data <br /> Table 2. Summary of Well Construction Details <br /> Table 3. Summary of Groundwater Flow Direction and Gradient <br /> Table 4. Groundwater Analytical Results(TPH and BTEX) <br /> Table 5 Groundwater Analytical Results(PAHs) <br /> Table 6. Summary of SPO/Water Mixture Extracted Through March 2013 <br /> Table 7. Summary of Recent SPO Thickness Measurements and Extraction <br /> Volumes <br /> Attachment A.References for Previous Environmental Investigations <br /> Attachment B.Field Data Sheets <br /> Attachment C.Data Usability Summary and Laboratory Analytical Reports <br />