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k, <br /> Engineers MAY 8 193.2 1y Aw <br /> Planners E N V11 R 0 <br /> Economists <br /> Scientists <br /> May 14, 1992 <br /> SF031604.P3 <br /> Mr. Steven Schneider, REHS <br /> Public Health Services <br /> San Joaquin County <br /> P.O. Box 2009 <br /> Stockton, CA 94598-2458 <br /> Subject: Proposed schedule of activities at Del Monte Plant 33, 110 North Filbert <br /> Street (Disco Tank Site), Stockton, California <br /> Dear Mr. Schneider: <br /> This letter presents Del Monte's proposed schedule for quarterly groundwater monitoring <br /> and groundwater remediation at Del Monte Plant 33 located at 110 North Filbert Street in <br /> Stockton, California (Figure 1). Del Monte has completed the onsite remedial <br /> investigation; the results of this investigation are presented in "Remedial Inves- <br /> tigation/Feasibility Study, Disco Tank Site, Stockton, California (February 1992)" <br /> (RI/FS). Removal and analysis of the soil from the underground pipe removal work was <br /> completed in April 1992 ("Underground Pipe Removal and Investigation Results", letters <br /> to Ms. Carol Oz/PHS, March 16 and April 23, 1992). <br /> The remedial investigation included collecting groundwater level and groundwater quality <br /> data. The shallow groundwater surface was found to exist at approximately 75 feet <br /> below ground surface. As described in the RI/FS, groundwater was observed to flow <br /> northwesterly at a gradient between 0.0005 and 0.0013. Groundwater monitoring results <br /> from the remedial investigation are presented in Table 1. These results indicated a <br /> contamination source area in the vicinity of monitoring well MW-1 and identify a plume <br /> extending through MW-2. The limits of this plume appear to be defined by MW-3, -4, - <br /> 6, -7S, and -71). <br /> Del Monte's proposed monitoring and remediation schedule is presented on Table 2. <br /> Prior to and during design and construction of the remediation system, Del Monte <br /> proposes quarterly groundwater monitoring beginning May 15, 1992. This quarterly <br /> groundwater monitoring program will include annual sampling of all eight Plant 33 <br /> CH2M HILL Son Francisco Office 6425 Christie Avenue.Suite 500 510.652.2426 <br /> Emeryville,CA 94608-7006 Fox 510.652.0482 <br />