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i i • Since monitoring well MW-7 is providing useful information on the vertical migration of hydrocarbons, ASE recommends that that this well remain on a quarterly sampling schedule Monitoring well MW-8 has, however, contained relatively low a n d I consistent concentrations of petroleum hydrocarbons, a n d therefore, ASE recommends that its sampling schedule b e reduced to semi-annual sampling (Spring only) + Although monitoring wells MW-9 and MW-10 show relatively low and consistent concentrations, ASE recommends that they remain on a quarterly sampling schedule since they provide an "early warning" for contamination that may be moving toward the on- site drinking water well • Since monitoring wells MW-11 through MW-15 aie new and have only been sampled once, ASE recommends that they be sampled on a quartet ly basis I5 ) Collect groundwater samples fiom the closest domestic water wells to the site ASE proposes collecting water samples fiom the wells located on the following propeities • 2110 Yosemite Avenue I + 2115 Yosemite Avenue • 2040 Yosemite Avenue + 17911 Airport Way ' • 17926 Airport Way • 17933 Airport Way I • 17950 Airport Way 12 . 0 REPORT LIMITATIONS IThe results of this assessment represent conditions at the time of the soil and groundwater sampling, at the specific locations where the samples were collected, and foi the specific parameters analyzed by the laboratory It does not fully characterize the site for contamination resulting from unknown sources, or foi parameters not analyzed by the laboratory All of the laboratory work cited in this report was prepared under the direction of an independent CAL EPA certified laboratory The independent laboratory is solely responsible for the contents a n d conclusions of the chemical analysis data Franks One Stop Report — May 2000 - 16-