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DAMES & MOORS <br /> San Joaquin Local Health District <br /> November 28, 1988 <br /> Page 3 <br /> Item 3: The existing monitoring well network (MW-1, MW-2, and MW-3) <br /> installed by Kleinfelder Associates was intended to evaluate the quality <br /> of groundwater directly downgradient and upgradient from the diesel leak <br /> area in the vicinity of the maintenance shop. The three monitoring wells <br /> were installed outside the area of diesel containing soils so as to avoid <br /> i <br /> any potential risk of creating a conduit for vertical migration of diesel <br /> fuel to the groundwater surface. <br /> In our judgment, the existing monitoring well network in the vicinity <br /> of the maintenance shop is adequate to detect any potential groundwater <br /> impact posed by the diesel leak area. As shown in the attached figure, <br /> wells MW-2 and MW-3 are located hydraulically downgradient and in close <br /> proximity to the contaminant source. Based on proximity of the <br /> downgradient wells to the source, and the predominant direction of <br /> groundwater flow, it is our opinion that migration of contaminants from <br /> the source area into groundwater would be detected by existing well MW-2 <br /> and MW-3. Furthermore, installation of monitoring wells within the <br /> diesel leak area could potentially result in the introduction of <br /> contaminants into the groundwater. <br /> As requested in your November 3, 1988 letter, the three existing <br /> monitoring wells and onsite production well will be sampled and tested. <br /> A workplan for this additional site characterization work has been <br /> attached for your review. <br /> As you know, both American Forest Products Company (AFPC) and <br /> American Moulding 6 Millwork (AM&M) are anxious to resolve this issue and <br /> we thank you in advance for considering an expeditious review. Dames & <br /> BS/2636b <br />