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k-w) <br /> Wright <br /> i EnvironmentalOr <br /> Services, Inc. <br /> R. Construction + Engineering • Remediation 03 JUN 30 If � `1 -A it <br /> a <br /> June 26, 2003 <br /> Project No. 4233-3 <br /> .Trust of Mary Gardella <br /> 525 2nd Street <br /> Santa Cruz, California 95060 <br /> Attn.: Ms. Winifred Alexander 4 <br /> Re: Monitoring Well Installation, Sampling and Assessment <br /> Addendum to Workplan Dated April 25, 2003 <br /> Stefano's Gasoline 1419 Charter Way, Stockton, CA <br /> l <br /> Dear Ms. Alexander, <br /> Wright Environmental Services, Inc. (Wright) has prepared this addendum workplan on behalf of <br />' Estate of Joe Gardella (owner) for the above referenced site. The proposed work is in response <br /> to a letter dated January 27, 2003 from the San Joaquin Public Health Services Environmental <br /> Health Division (PHS EHD) for additional monitoring well installations and site assessment. This <br /> work is being done to address petroleum contaminants on-site. Previous site assessment activities . <br /> have mapped portions of the dissolved plume and quarterly monitoring samplings with reports are <br /> ongoing at the site. The addendum was discussed in the meeting between Wright and PHS EHD <br /> representatives on May 22, 2003 and their letter dated June 2, 2003. <br /> Meeting of May 22, 2003 and Discussion of Workplan <br /> Wright and PHS EHD representatives discussed the April 25, 2003 workplan and the previous <br /> site work to date. The tanks were installed on the property in 1971 and the leak appears to center <br /> on the former tank pit. Groundwater levels in the area may have been up to 30 feet deeper than <br /> E, present day, a condition that would have enhanced vertical contaminant penetration in years prior ` <br /> to the more recent groundwater "rebound" and water levels rising in the area. PHS EHD was in <br /> general agreement with the workplan but indicated concerns regarding,the nature of the site <br /> stratigraphy and contaminant pathways for all contaminants, especially 1,.2-Dichlorethane (1, 2- <br /> DCA). Currently, three water bearing zones of interest occur at about 35'50 feet, 60-65 feet and <br /> 110-119 feet have been identified. The largest area of petroleum contaminant appears within the <br /> 35-50 foot aquifer zone (roughly the area of MW-2), with scattered occurrences laterally in the <br /> deeper zones. ` <br /> 67 . 10th Street Tracy, CA 95.376 Page ] of 6 <br />+` 209.333.0758 • Fax 209.832.5152 <br /> wrighi@inreach.com Lie. #651501 A-B HazMat, C21 �I►� <br /> websit htip://wri_zhtenvironmentalservices.com j UI <br />