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Ix IL RAW <br /> 623 Camellia Way, Lodi,CA 95242 <br /> phone/fax(209)369-0482 <br /> 06/06/2005 Zeeb <br /> Mr.Jeffery Wong "U%V � <br /> San Joaquin County Public Health Services 1V d <br /> Environmental Health Division304 <br /> E Weber eber e,Third Floor <br /> Stockton, MiTjSEA���s Ty <br /> Subject: ADDENDUM TO WORK PLAN FOR A PHASE II FIELD INVESTIGATION of PLUME <br /> BOUNDARY-WESTERN OIL AND SPREADING, 19256 N.HIGHWAY 99,ACAMPO,CA <br /> Dear Mr. Wong: <br /> Enclosed is.D.K. BARBER P.E. and ASSOCIATES', addendum to the earlier proposed <br /> (October 17, 2003) work plan for the subject site. I do not consider this a change in <br /> scope but simply additional drilling along a broader leading edge to define the plume. <br /> The same method, health considerations and other considerations discussed in our <br /> earlier plan remain with one exception. We have gained additional information from <br /> hydropunch and monitoring well samples over the intervening 19 months. A summary <br /> of results is attached for your reference. <br /> Proposed excavation discussed in our August 12, 2004 draft plan has been postponed. <br /> Additions to earlier installation and monitoring of six on site wells include; <br /> Between 6 and 8 additional borings utilizing Cone Penetration Test (CPT) <br /> /Hydopunch (HP) equipment operated by Gregg Drilling, Inc. will be used to <br /> further define the lateral extent of ground water contamination. Additional <br /> borings may be employed while on site, if warranted. The area to be probed <br /> and expected to contain the leading edge of hydrocarbon plume is on the same <br /> two contiguous parcels, APN's 017-09-02 and 017-09-35 with the same <br /> owner. <br /> Borings, anticipated to be down gradient from the original source, will extend <br /> approximately 60 FT below surface grade (bsg) to collect a groundwater <br /> sample. <br /> Boring locations will depend upon findings as "real time" onsite information is <br /> interpreted through the one to two day event. Initially six holes along an arc <br /> ranging from west to east to about 400 FT south east of existing MW No. 6 will <br /> be probed and sampled. Please refer to the attached Site Map with previous <br /> boring locations and findings. I have considered surrounding wells that may <br /> affect plume advancement in the selection of potential sampling points. The low <br /> on site detection levels of diesel may not be measurable at the site. Headspace <br /> hydrocarbon indication (using PID instrumentation) and down hole <br /> measurements indicating hydrocarbons may not be reliable when dealing with <br />