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P-N RESNA WATERWORK CORP. <br />INDUSTRIES k—A—AJLA.M.AJLA..dkf <br />October 12, 1990 <br />Ms. Eleanor Ratliff <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />P.O. Box 2009 <br />Stockton, CA 95201 <br />PAYMENT <br />RECEIVED <br />OCT 19 1938 <br />SAN JOAQUIN COUNTY <br />PUBLIC HEALTH SERVICES <br />ENVIRONMENTAL HEALTH DIVISION <br />Re: Site Code 1864, 26080 Thornton Road, Thornton, CA <br />Dear Ms. Ratliff: <br />This letter is being submitted as an addendum to WaterWork's <br />August 14, 1990 Preliminary Report/Workplan for the above <br />referenced site. <br />Contaminated soils remaining within the former tank pit should be <br />removed to prevent the contaminated soil from presenting a <br />continued threat to groundwater. It is estimated that <br />approximately 150 cubic yards of soil will be excavated. The <br />excavation will be limited by the building foundation and the <br />shallow depth to groundwater (approximately 9 feet). To avoid <br />exposing an open excavation and associated soil pile during the <br />rainy season, WaterWork will schedule re-excavation of the former <br />tank pit for early spring when aeration of contaminated soils can <br />be completed efficiently. In the interim, the former tank pit <br />will be covered with 6-mil plastic to prevent leaching of <br />contaminants. <br />To determine the lateral extent of soil and groundwater <br />contamination, WaterWork will drill three soil borings around the <br />former tank location which will be converted to groundwater <br />monitoring wells (Figure 1). Installation of three monitoring <br />wells will allow for the determination of a verified down <br />gradient direction, suspected to be to the west, based on nearby <br />site. <br />A municipal supply well, Thornton Well No. 2, is located <br />approximately 90 feet north of the former tank locations. This <br />well has screened intervals from 135-150 feet, 160-185 feet, and <br />225-235 feet, is sealed to depth of 70 feet, and is not expected <br />to be affected by groundwater contamination. The westward flow <br />of groundwater should inhibit contaminant migration toward the <br />municipal supply well. Should monitoring data collected from the <br />1710 MAIN STREET • ESCALON, CA 95320 • (209) 838-3507 <br />2350-A WALSH AVENUE • SANTA CLARA, CA 95051 • (408) 496-1249