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t p <br /> I <br /> rNKFU rI F?V i C,is <br /> j ENVIRONMENTAL TECHNOLOGIES CORPORATION <br /> n � ct• JJ <br /> May 15, 1996 <br /> 94373 <br /> Ms. Mary Meays <br /> San Joaquin County <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Addendum to Workplan for Subsurface :,;Investigation at Former Thiemann's <br /> Service, 106 West Second Street;Ripon, California <br /> Dear Ms. Meays: <br /> Smith Environmental Technologies Corporation has prepared this workplan addendum to address <br /> changes in the scope of work discussed at the meeting held on May 14, 1996 between Mr. Gerald <br /> Thiemann, Ms. Mary Meays of the San Joaquin County Public Health Services (PHS/EHD), and <br /> Ms. Jeanne Homsey of Smith Environmental. <br /> It was agreed to at the meeting that the installation of the off-site.groundwater monitoring wells <br /> would be postponed pending further monitoring results. A reduction in the quarterly sampling <br /> was also agreed upon at the meeting. Depth to water measurements will be taken from all wells <br /> during the third and fourth quarter, but only MW3 and MW6 will be sampled for laboratory <br /> analysis. <br /> The revised scope of work will include the installation of:two air sparge wells and three vapor <br /> wells at the subject site (Figure 1). The purpose of the investigation is to determine if vapor <br /> extraction and air sparging are viable remedial options for the impacted soil and groundwater. <br /> The new wells will be used for conducting a combined air sparge and vapor extraction pilot test. <br /> The details of the pilot test will be addressed in a subsequent workplan. This report outlines <br /> procedures and practices to be utilized during field investigations. <br /> REVISED SCOPE OF WORK <br /> Smith Environmental proposes the following scope of work to evaluate potential remedial <br /> alternatives at the subject site. <br /> w:\94373\repoRc\wp0496a.doc 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> RnneWtinv Remediation Construction <br />