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v <br /> r <br /> San Joaquin County Environmental Health Division Project 3267-E <br /> October 22, 2000 Page 2 <br /> We will review all available sources of information to identify well/receptors within a <br /> 2,000 foot radius of the subject property State law requires well drillers to submit well <br /> logs for municipal, industrial, agricultural, and private wells to the California Department <br /> of Water Resources This agency will be our primary source of information <br /> I he offsite, vertical extent of the contaminated soil plume will be evaluated by two <br /> additional direct-push probes, extending to a depth of 50 feet, located in the City of <br /> Stockton right-of-way northeast of the site, as shown on Plate 1 (Probes 1 and H) Soil <br /> samples will be obtained at 10 foot intervals and tested for TPH-gas, TPH-diesel, <br /> benzene, toluene, ethyl benzene, xylenes, and methyl tertiary butyl ether (MTBE) using <br /> EPA Methods 8015/8020 A groundwater sample will also be obtained from each probe <br /> and tested for the above constituents <br /> The vemeal extent of the on-site groundwater contamination Will be evaluated by two <br /> additional direct-push piezometer probes, to obtain groundwater samples from depths of <br /> 60 and 100 feet below ground level in the northeast corner of the site, m the vicinity of <br /> maximum contamination at Probe A <br /> We trust that this work pian addendum meets with your approval if you have any <br /> questions, please do not hesitate to call our office The following plates are attached and <br /> completes this addendum <br /> Plate 1 Plot Plaii <br /> Plate 2 Monitoring Well Construction <br /> Very truly yours, <br /> HYDRO-GEO CONSULTANTS, INC <br /> 0�a I " 0 ` (2"A, <br /> John T O'Rourke, HG 395 <br /> cc Sutter office Center <br /> HYDRO GEO CONSULTANTS,INC <br />