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07/15/98 O9 22 '0209 465 7244 FORS' OF STOCKTON X1002 <br /> �n <br /> �Ic 2 <br /> Port of Stockton 00 �� <br /> General Offices P Q Box 2039,Stockton, CA 85209-2089 <br /> (2M)945-02451 FAX(209)4135-7244 or(209)466-5986 <br /> July 15, 1996 <br /> VIA FACSIMILE(209)464-0138 <br /> Ms Carol Oz <br /> Environmental Heap Specialist <br /> San Joaquin County Public Health$arvsce <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> St cldon, Calrfomia 95202 <br /> Subject Addendum to"Vllork Plans for Initial Subsurface Investigation of Petroleum <br /> Hydrocarbone-Site NumtYere, 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 Juvy 93, 1998 meeting held at your office.As coNwhvely agreed at our <br /> meeting, the primary revision to the Work flans is that collection of soil samples for petroleum <br /> hydrocarbon compound (PHO') analysis will not be limited to the vadvse zone, but may be collected <br /> fhxn below the water table as well. Your rational was that primarily due to the elevated water table, <br /> the contat inants might have vertrcaly migrated to the subsurface soils below the groundwater table <br /> The following describes the amended procedures for field investigMions at each of the subject sites <br /> As described in the Work Plans, continuous core samples wnll be collected utilizing ft <br /> Geoprobe dirert-push method in the initial boring dniled at each UST site. The core will be collected <br /> for the purpose of characterizabon of subsurface Irthology, PHC impact, and depth to groundwater <br /> at the UST site The continuous core samples %mil be collected in dear plastic or acrylic liners. <br /> labeled,capped, and temporarily stored in ice chests on site Sod ems will be examined for visual <br /> indications of discoloration and PHC odor,and screened wrath a portable photoionization detector for <br /> the presence of organic vapors. Based on sod-core exarrrinetiM a minimum of two soil samples, <br /> spaced 5-feet apart, will be selected from the continuous Care and st,bMitted to the laboratory for <br /> analysis of PHCs, even if the selected samples are collected from blow the water table. Soil <br /> samples void be analyzed for the constituents described in Section 3.2 of the Work Plans <br /> Examination of the core samples wAl provide target locations for collection of a minimum of two soil <br /> samples and one groundwater sample in each of the rernatnrng borings at each site <br /> GENERAL OFFICE 2201 W WASHINGTON ST , STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br />