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..... . . ... copy CONDOR EARTH TECHNOLOGIES INC. July 9, 1998 1125 N.Golden State Blvd. 188 Frank West Circle Suite G Suite I Turlock, CA 95381 Stockton, CA 95206 (209) 668-9234 (209) 234-0518 Mr.Ron Rowe FAX(209) 668-9248 FAX(209) 234-0538 San Joaquin County Public Health Services Environmental Health Department P.O.Box 388 Stockton, CA 95201-0388 RE: Herman &Helen's Marina,Venice Island Ferry,Stockton,CA - Work Plan Addendum Dear Mr.Rowe: This letter is an addendum to the Work Plan—Additional Soil and Groundwater Investigation and - Surface Water Sampling,dated May 27, 1998, prepared by Condor Earth Technologies,Inc.(Condor). The Work Plan was conditionally approved by you in a faxed document dated July 1, 1998. As a condition to your approval of the Work Plan you requested that the source of drinking water for the above referenced facility be sampled, that a receptor/water well survey be conducted, and that additional soil borings be installed. A completed Soil Boring Permit was also requested. This addendum addresses those requests. The source for Herman&Helen's drinking water is an inlet pipe located beneath a dock in Little Connection Slough. The water is treated with a reverse osmosis/membrane style filter system. Figure 1, attached, shows the approximate location of the inlet pipe and the water treatment system. Concurrent with the field work described in the above referenced Work Plan,Condor will collect a water sample from the raw water inlet port located at the water treatment system. The water will be allowed to run for at least five minutes prior to sampling. The water sample will be analyzed for the gasoline additives/ oxygenates by EPA Method 8260. The water sample will be collected,handled, analyzed, and reported as described in the Work Plan. Condor will complete a survey of the area to identify any users or receptors of ground or surface water within a 1,000 foot radius of the site. Potential sources of petroleum hydrocarbon contamination will also be identified, if possible, during the search. The findings of the survey will be included in the report prepared for the investigation described in the Work Plan. The installation and sampling of five soil borings were described in the above referenced Work Plan. Four additional soil borings will be installed, as requested. The borings will be located as shown in Figure 2, attached. The borings will be installed and sampled as described in the Work Plan. It should be noted that all of the borings proposed in the Work Plan and this addendum are not located on Herman & Helen's Marina property. Mr. Jerry Matthews of Herman and Helen's Marina indicated that ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL http://wew+.condorearth.com