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Mr. Thomas J. Bois <br /> March 13, 1997 <br /> Page 4 <br /> specific soil gas cleanup goal may be developed based on the Los Angeles <br /> Regional Water Quality Board guidance document. A copy of the document is <br /> attached for your information (Attachment B). Additionally, groundwater <br /> monitoring wells should be installed at the Site to determine if the PCE released <br /> from the two former dry cleaners has impacted the groundwater beneath the Site <br /> and the extent of groundwater contamination. <br /> DTSC can not reiterate the importance of cooperation and coordination <br /> among all parties involved including American Stores Properties, Incorporated <br /> (ASPI) and ASPI's contractor, Montgomery Watson, for investigation and <br /> remediation of the PCE contamination found beneath the Site. Montgomery <br /> Watson should be aware that sampling locations specified in the workplan may be <br /> changed based on field sampling results. Therefore, DTSC must be provided the <br /> opportunity to review and discuss data collected in the field with Montgomery <br /> Watson so that early evaluation of the sampling results and sampling locations <br /> will be possible. Furthermore, appropriate background information used by ASPI <br /> or Montgomery Watson; i.e.,document to determine location of the Building that <br /> housed the two former dry cleaners, should be provided to DTSC as early as <br /> possible. The primary goal of DTSC's involvement in site investigation and <br /> remediation is to ensure that data collected will be of representative and adequate <br /> so that re-sampling will not be necessary. DTSC believes that reasonable <br /> cooperation and coordination among all parties will avoid unnecessary confusions <br /> and is the most cost effective way to carry out site investigation and remediation. <br /> DTSC requires that a workplan to include additional soil gas sampling and <br /> groundwater monitoring wells be submitted for review and approval within 45 <br /> days from the date of this letter. Soil gas sampling results may be used to <br /> evaluate locations of the groundwater monitoring wells proposed in the workplan. <br /> DTSC appreciate your cooperation in this matter. If you have any questions, <br /> please contact Ms. Jean Young at(916) 323-3372, or myself at (916) 322-9224. <br /> Sincerely, <br /> Jerome R. Marcotte, P.E., Chief <br /> Regional Groundwater Remediation Unit <br /> Site Mitigation Program <br /> Enclosures <br />