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r • <br /> Mr. William Little <br /> February 20, 1997 <br /> Page 2 <br /> Comments : <br /> Soil gas samples from these three active soil gas <br /> probe borings are collected to help: (1) determine the <br /> horizontal extent of the PCE and/or TCE contamination <br /> north of the Site; and (2) determine if the storm <br /> drainage lines were used in the past to discharge on- <br /> Site PCE-contained wastewater. <br /> To accomplish these purposes, you may want to take <br /> one soil gas sample at a down gradient location that is <br /> in line with the dry well (see Figure 2) . The other <br /> locations may be changed to further north to assist you <br /> in plotting the PCE and/or TCE isoconcentration maps . <br /> The above comments may be incorporated into the <br /> field sampling work scheduled on February 25, 1997 and <br /> the report documenting the sampling results (Submittal <br /> of an addendum or revised sampling workplan to <br /> incorporated these comments is not necessary) . If you <br /> have any questions, please contact me at (916) 323-3372 <br /> or Mr. Jerry Marcotte at (916) 322-9224 . <br /> Sincerely, <br /> ,La.vt <br /> Jean Young <br /> Hazardous Substances Engineer <br /> Site Mitigation Program <br /> Enclosures <br /> CC : See attached page . <br />