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u <br /> Remediation NOV 2 81989 <br /> Services, Inc. ENVIRONMENTAL HEALTH <br /> . <br /> PcR�v1ET/S ERV;�tS <br /> 5729-F Sonoma Drive • Pleasanton, CA 94566 <br /> (415)462-4002 FAX(415)462-6283 <br /> November 17, 1989 Work Plan No. RP89062 <br /> Elenor Ratcliff <br /> San Jonquin Local Health District <br /> 1601 E. Hazelton Avenue <br /> Stockton, California 95201 <br /> SUBJECT: Work Plan for Soil Sampling <br /> Lodi Overhead Door Facility <br /> Lodi, California <br /> Dear Ms. Ratcliff: <br /> Remediation Services, Inc. is pleased to present our work plan <br /> for test hole drilling and soil sampling at the subject site in <br /> Lodi. The purpose of this work is to characterize the lateral <br /> extent of contamination in an excavation pit at the site. Three <br /> walls of the excavation can be adequately characterized by <br /> samples which were previously collected. The fourth wall along <br /> the street has shown contamination to a lateral extent of five <br /> feet, which is the middle of the sidewalk. Based on samples at <br /> the surface of the excavation sidewall, and at the sidewall <br /> midpoint, contamination would be expected to attenuate below the <br /> cleanup standard near the sidewalk/street interface. <br /> We propose to drill with a B-53 Mobile drill and sample three 8 <br /> inch diameter borings in the sidewalk on the north side of Mounce <br /> Street, parallel to the excavation at the overhead door facility. <br /> The three borings would be four feet from the north edge of the <br /> sidewalk. (see attached Plot Plan) . Soil samples would be <br /> collected at intervals of five feet to a depth below ground <br /> surface of 15 feet. One additional composite sample would be <br /> collected in order to simulate samples collected from the pit <br /> sidewall. The composite sample would be used for comparison to <br /> previous composite samples. Samples would be analyzed for <br /> nickel, zinc, and pH in our BSK & Associates State- certified <br /> Laboratory. A fourth boring would be drilled and sampled at a <br /> distance of about two feet south from the row of three borings. <br /> Samples from this fourth boring would not be analyzed unless the <br /> results from the other three borings indicated that contamination <br /> has not attenuated below cleanup standard at the street/sidewalk <br /> interface. The fourth boring would allow a graphical plot to be <br /> made to estimate location of the contamination boundary, if <br /> necessary. This fourth boring would efficiently utilize <br /> available drilling time during the day of drilling. <br /> A Subsidiary Company of BSK & Associates <br />