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_ R'•.M'. �F11� a <br /> C-yY <br /> No <br /> f S r <br /> r 83 VVEST MARCH LANE <br /> SUITE 12 <br /> STOCKTON,QA 95WO-1 <br /> PHONE" ;2R9)476-163:, <br /> � ,� i�.a�nGEh� [�S�GNERSCOrv5U:Ta�iTS <br /> hh March 30, 1998 x, <br /> Mr, David R. Carle, R. S. <br /> San Joaquin Local Health District =t <br /> x 1601 East Hazelton Avenue <br /> PO Sox 2009 <br /> FStockton, CA 95201 <br /> Dear Mr. Carle, <br /> i <br /> The following ;cork plan relates to the subsurface investigation <br /> of diesel residues at the Ragu Foods, Inc. , facility located at <br /> 1400 waterloo Road, Stockton, CA. The plan addresses the instal- <br /> lation and sampling of three shallow groundwater wells. Three <br /> sites have been selected for the installation of monitoring `{a <br /> wells, as shown on the attached drawing. The orientation of the <br /> R'' • wells at 120 degrees apart is ideally suited to the determination ; <br /> ,µ of the direction of groundwater , flow. The: wells will be locat ,`'� <br /> ° _ about 60 feet from the tank site in areas that should provide ; <br /> 3>; some security from heavy truck traffic. The wells should be'' <br /> screened from 10 feet above the water table to 20 feet below the ,. <br /> top of the water table. The 20 foot depth of well screen below <br /> the water table may be reduced if an underlying clay of greater <br /> than 5 feet thick is encountered; as there is no desire to ".. <br /> t> penetrate through confining layers, thus creating the potential � '� <br /> for the inadvertent contamination of underlying aquifers. <br /> During the drilling of the monitor wells, soil samples will <br /> collected from each location at the surface and at 5 ' interval' <br /> thereafter down to groundwater. Those samples appearing visua11"' <br /> stained, odorous or otherwise contaminated, or producing <br /> response on a field screening instrument (a HNu photofonizer) ; .. <br /> ' will be submitted for chemical analysis. If no samples appear ,, <br /> = Y contaminated, then the two samples closest to groundwater will b04-' . <br /> submitted; no more than 9 soil samples per monitor well location >` - <br /> will be submitted for chemical analysis. Chemical analysis of <br /> soils will include benzene, toluene, xylene and ethylberi�enee' <br /> using EPA Method 8020, and total petroleum hydrocarbon by Methot, <br /> 8015. <br /> Once the wells are installed and developed, water samples will, b` <br /> S 4= . collected and analyzed for benzene, xylene, toulene a <br /> ethylbenzene per EPA Method 632 , and total petroleum hydrocarbo <br />