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SEP-11-97 THU 02:39 PM P. 02/09 • 3164 G01a Camp Drive a Swte 200 a ��. Rancho Cordova,CA 85670 Environmental 916i638-2085 Consultants,Inc. FAX 916i63a-9385 September 11, 1997 Ms. Mary Meays San Joaquin County Department of Public Health Services Environmental Health Division 304 East Weber Avenue Stockton, California 95201-388 Subject: Addendum to Revised Work Plan for On-Site Assessment Holz Rubber Company, hic 1129 South Sacramento Street Lodi, California Delta Project No. D096-090 Dear Ms. Meays: This letter is a request to install an additional soil boring at the Holz Rubber Company, Inc. (Holz) located at 1129 South Sacramento Street, Lodi, California (Figure 1). The additional boring is proposed to be installed approximately five feet from monitoring well MW-4 (Figure 2). Following the collection,logging, and field screening of the soil samples from MW4, the chain-of-custody "Chain" between the soil samples and the sampler was broke Due to this break in the "Chain", Delta is requesting to install a soil boring adjacent to monitoring well MW-4 and collect soil samples at four discreet intervals, s 26, 45;and 66 feet below surface grade. These were the samples scheduled for submittal from MW-4. During drilling, soil cuttings will be continuously screened in the field using a flame ionization detector(FID) for volatile compounds. Readings will be recorded. Delta is not proposing to collect samples at 5 foot intervals from the soil boring (as was done in MW-4)due to the soil borings proximity to MW4 and the reported lack of any positive field readings during the installation of MW-4. Soil Boring The boring will be advanced using 8.25 inch outside diameter hollow stein augers. Soil samples will be collected in cleaned brass tubes, 2 inches in diameter by 6 incites in length. The tubes are typically set in an 18 inch long split-barrcl sampler. The sampler is conveyed to the bottom of the borehole attached by a wire-line hammer device When possible, the split-barrel sampler is driven its entire length, either hydraulically or by repeated pounding a 140-pound hatmner using a 30-inch drop. The sealed sample is labeled and handled according to the Quality Assurance Plan Matcnal from one of the other tubes or the shoe of the sampler is screened m the field, according to the Soil Sample Screening section. The data is recorded on the boring logs at the depth corresponding to the sampling point. Providing a Competitive Edge