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# Comment Response to Comment maximum horizontal and vertical extent on the eastern edge is undefined. Recommended Actions: Additional grab groundwater samples on the eastern boundary of the contaminant plume at Site 4 are necessary to constrain the plume that models indicate diving to the east.At least one of the points should be advanced to the east of well W-107 and one to the northeast of W-105/W-111. Additional grab groundwater samples should also be collected from the area southeast of W-215/W-110. 4 Issues: The maximum horizontal and vertical extent of the vinyl See response to DTSC General Comment 5. chloride plume surrounding the UST 817B site of the Central Area is undefined on the upgradient/southeast corner. In addition, due to the diving nature of plumes, Central Valley Water Board believe the well 917-01 is too shallow to assess the northwestern maximum extent of the vinyl chloride plume (the area between the UST817B plume and the Site 49 plume). Recommended Actions: Central Valley Water Board staff recommend the Port add additional grab groundwater samples to define the maximum horizontal and vertical extent of the UST 817B vinyl chloride plume to the southeast and northwest. 5 Issues: Central Valley Water Board staff also identify a data See response to DTSC General Comment 3d. gap to the north of the vinyl chloride plume at Site 49. Recommended Actions: Central Valley Water Board staff recommend the Port add an additional grab groundwater sample to the north of the vinyl chloride (plume)near the well P-160 to determine the maximum horizontal and vertical extent of the Site 49 vinyl chloride plume. 6 Issues: The small plume modeled near Building 916 is defined See response to DTSC General Comment 3e. by one well, W-302. The well W-301 confirms that there is a 7 08.03.2019