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%wool Now <br /> CONFIRMATION SENT <br /> BY TELECOPY <br /> . . !`. .C= 29 0 0 <br /> Port of Stockton o`oG <br /> General Offices: P.O. Box 2089, Stockton, CA 95201-2089 <br /> (209) 946-02461 FAX (209) 465-7244 or (209) 466-5986 <br /> July 15, 1998 <br /> VIA FACSIMILE (209) 464-0138 <br /> Ms. Carol Oz <br /> Environmental Health Specialist <br /> San Joaquin County Public Health Service <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Subject: Addendum to "Work Plans for Initial Subsurface Investigation of Petroleum <br /> Hydrocarbons" - Site Numbers 1 through 5 <br /> Site Codes 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 office. 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 limited to the vadose zone, but may be collected <br /> from below the water table as well. Your rational was that primarily due to the elevated water table, <br /> the contaminants might have vertically migrated to the subsurface soils below the groundwater table. <br /> The following describes 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 utilizing the <br /> Geoprobe direct-push method in the initial boring drilled at each UST site. The core will be collected <br /> for the purpose of characterization of subsurface lithology, PHC impact, and depth to groundwater <br /> at the UST site. The continuous core samples will be collected in clear plastic or acrylic liners, <br /> labeled, capped, and temporarily stored in ice chests on site. Soil cores will be examined for visual <br /> indications of discoloration and PHC odor, and screened with a portable photoionization detector for <br /> the presence of organic vapors. Based on soil-core 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 will be analyzed for the constituents described in Section 3.2 of the Work Plans. <br /> Examination of the core samples will provide target locations for collection 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 />