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C209 X65 i2�� PORT OF STOCKTON X442 <br /> 07/15/98 x9.22 _ <br /> Spol <br /> 2 <br /> Port of Stockton <br /> General Offices: P.O. Box 2089.Sbo dW. CA 95201-2089 <br /> (2W)948-0246 /FAX(209)465-7244 or(209)466-59W <br /> July 15, 1998 <br /> VIA FACSIMILE(209)45'4-0138 <br /> Ms. Carol Oz <br /> Environmental Heatth Specialist <br /> San Joaquin County Public Health Service <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95292 <br /> Subject Addendum to"Work Plans for Initial Subsurface Investigation of Petroleum <br /> Hydrocarbons"-Site Numbers 1 through 5 <br /> Site Cedes 1282 1282-124; 1282-10: and 1237 <br /> Dear Carol: <br /> The Port of Stockton(Port)is pleased to submit this addendum to the subject Work Plans. <br /> prepared as a result of our July 13, 1998 meeting held at your offioe. As collectively agreed at our <br /> meeting, the primary revision to the Work plans is that collection of soil samples for petroleum <br /> hydrocarbon compound (PHC)analysis will not be llmitad to the vadose zone, but may be colkcbed <br /> from:below the water table as well. Your rational was that primarily due to the elevated water table, <br /> the contaminants might have vefticaly migrated to the subsuface sols below the groundwater table. <br /> The foliowing descnl>es the amended procedures for field investigations at each of the subject sites. <br /> As described in the Work Plans, continuous core samples will be collected utL-dng the <br /> Geopr,obe dim-push method in the initial boring drilled at each VST site- Thee oore willi be collected <br /> for the purpose of charactertion of subsurface lithokM, PHC impact, and depth to groundwater <br /> at the UST site. The continuous core samples will be collected: in dear plastic or acryk liners, <br /> labeled, capped, and temporarily stared in ice chests on site. Soil cores wM be examined for visual <br /> indications of discdoration and PHC odor,and screened with a portable photoionization detector for <br /> the presence of organic vzpors. Based on soil-ane examination,a minimum of two soil samples, <br /> spaced 5-feet apart,will be selected from the continuous core and submitted to the laboratory for <br /> analysis of PHCs, even if the selected samples are collected from below the water table. Soil <br /> samples wM be analyzed fir the constituents descried in Section 3.2 of the Work Plans. <br /> Examination of the core samples will provide target locations for correction of a minimum of two soil <br /> samples and one groundwater sample In each of the remaining borings at each site. <br /> GENERAL OFFICE: 2201 W. WASHINGTON ST., STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br />