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Mr. Theodore I. Wittmayer, Attorney at Law January 2 , 1993 <br /> Stone Brothers and Associates rage 5 <br /> upgradient, background water quality data is essential in order to identify the source or sources, <br /> including possible offsite, upgradient sources. <br /> Two additional wells should be installed on the site to establish at least one upgradient and one <br /> downgradient well location. For the purpose of siting these wells, the approximate groundwater <br /> flow direction should be determined through consultation with the EHD and other local <br /> government agencies. <br /> Summary <br /> It is WESTON's understanding that Stone Brothers desires to accomplish the site investigation <br /> and potential remediation as quickly as possible. The investigation work scope currently <br /> proposed by EAI does not appear to support that objective. Given the current scope of work, /i/E5 <br /> WESTON believes that the EHD will require additional soil borings to fully define the lateral✓ i <br /> extent of hydrocarbon impact to soil in Area 2 and will also require at least one and poss' ly two <br /> additional groundwater monitoring wells to be installed on the site in order to determine the <br /> groundwater flow direction and the upgradient and downgradient groundwater quality. <br /> WESTON also believes that it would be in Stone Brothers best interest to have the con to slab <br /> removed from former UST site. The overall schedule could be expedited by including these <br /> activities in the Phase V field effort. <br /> WESTON appreciates this opportunity to provide this advisory to Stone Brothers. If you have <br /> any questions, please do not hesitate to contact me in the Stockton office. <br /> Sincerely, <br /> ROY F. WESTON C. <br /> 4 . �r� , '0 <br /> Robert M. Sengebush, R.G. <br /> Project Manager <br /> RMS/cmc <br /> Attachment <br /> MC" MN MVRI." <br />