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3164 Gold Camp Drive <br /> Delta A anc z°° <br /> ��. Environmental g-1 SES' 5 Q -' ' ancho Cordova,CA 95670 <br /> 916/638-2085 <br /> Consultants,Inc. FAX 916/638-8385 <br /> September 11, 1997 <br /> Ms. Mary Meays <br /> San Joaquin County Department of Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201-388 <br /> Subject: Addendum to Revised Work Plan for On-Site Assessment <br /> Holz Rubber Company, Inc. <br /> 1129 South Sacramento Street <br /> Lodi, California <br /> Delta Project No. D096-090 <br /> Dear Ms. Meays: <br /> This letter is a request to install an additional soil boring at the Holz Rubber Company, Inc. (Holz) <br /> located at 1129 South Sacramento Street, Lodi, California (Figure 1). The additional boring is <br /> proposed to be installed approximately five feet from monitoring well MW-3 (Figure 2). Following the <br /> collection logging, and field screening of the soil samples from MW-3, the chain-of-custody "Chain" <br /> between the soil samples and the sampler was broken. Due to this break in the "Chain", Delta is <br /> requesting to install a soil boring adjacent to monitoring well MW-3 and collect soil samples at four <br /> discreet intervals; 6, 26, 45, and 66 feet below surface grade. These were the samples scheduled for <br /> submittal from MW-3. During drilling, soil cuttings will be continuously screened in the field using a <br /> flame ionization detector(FID)for volatile compounds. Readings will be recorded. <br /> Delta is not proposing to collect samples at 5 foot intervals from the soil boring (as was done in <br /> MW-3) due to the soil borings proximity to MW-3 and the reported lack of any positive field readings <br /> during the installation of MW-3. <br /> Soil Boring <br /> The boring will be advanced using 8.25 inch outside diameter hollow stem augers. Soil samples will be <br /> collected in cleaned brass tubes, 2 inches in diameter by 6 inches in length. The tubes are typically set <br /> in an 18 inch long split-barrel sampler. The sampler is conveyed to the bottom of the borehole attached <br /> by a wire-line hammer device. <br /> When possible, the split-barrel sampler is driven its entire length, either hydraulically or by repeated <br /> pounding a 140-pound hammer using a 30-inch drop. The sealed sample is labeled and handled <br /> according to the Quality Assurance Plan. <br /> Material from one of the other tubes or the shoe of the sampler is screened in the field, according to the <br /> Soil Sample Screening section. The data is recorded on the boring logs at the depth corresponding to <br /> the sampling point. <br /> Providing a Competitive Edge <br />