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AmLj HORIZdN ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> February 10, 1998 <br /> Mr. Jeffrey Wong <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Addendum to Work Plan <br /> Former Discovery Chevrolet <br /> 1615 11th Street, Tracy, California. <br /> Ms. Lagorio: <br /> At the request of our client, Horizon Environmental Inc. (Horizon) has prepared this letter <br /> Addendum to the Work Plan for the above-referenced site. This addendum was required <br /> by the San Joaquin County Public Health Service / Environmental Health Division <br /> (SJCPHS/EHD) in a letter dated February 6, 1998 that comments on Horizon's Work <br /> Plan for Additional Subsurface Investi ation at the above-referenced site (Horizon, <br /> January 27, 1998). <br /> As required in the SJCPHS/EHD letter, the following modifications to the Work Plan are <br /> numbered as in the SJCPHS/EHD letter and discussed below: <br /> 1) Label all proposed soil borings and h dro unches. Since the locations of soil <br /> borings or GeoProbes may change based upon actual field conditions, such as <br /> underground utilities, restrictions for accessibility, or unknown contaminant <br /> levels, these locations are generally not labelled until located out in the field at the <br /> time of drilling. This eliminates any confusion that renumbering in the field can <br /> generate. <br /> 2) Include analysis of oxygenates from all water samples using EPA Method 8260. <br /> Task 4 of the proposed work will be modified to include analysis for the <br /> oxygenated fuel additive compounds methanol, ethanol, tertiary butanol, MTBE, <br /> di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), and tertiary amyl <br /> methyl ether (TAME) to confirm their non-existence in the groundwater beneath <br /> the site. Previous analysis of groundwater samples collected during 1997 <br /> quarterly monitoring episodes have indicated that the above oxygenated fuel <br /> additive compounds are not present in the groundwater beneath the site. <br /> 3) A borin2 through the former dispenser [location] and determine vertical definition <br /> below groundwater. The proposed boring location that had been situated <br /> 5011 Golden Foothill Parkway,Suite 7 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO.Box 5283 • Bakersfield,CA 93388 9 (805)589-8389 • FAX(805)589-1456 <br />