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Ad,20' 'ced <br /> GeoEnvironment 1 Inc. <br /> 16-Aprif 2004 <br /> AGE-NC Project Number-99=0637. -- APR' 2- 1.2004 <br /> k,;�iviE[J HEALTH <br /> ENVH <br /> ICES <br /> _ Ms-. Lori Duncan - <br /> San Joaquin County Environmental Health Departmen <br /> 304.East Webber Avenue, third floor <br /> Stockton;CA .95202 <br /> Subject:. Ozone Inje ,nction PilotStudy,Work P1 Addendum <br /> MANTECA CITY CORPORATION YARD. <br /> 210 East Wetmore Street, Manteca; California <br /> Dear Ms. Duncan: ' <br /> At the request of Mr. Frederic Clark of the City of anteca,_Advdneed GeoEnvironmerital, Inc. <br /> (AGE) has prepared this addendum'to the AGE-prepared,-Ozone_Injection Pilot Study Work Plan, - <br /> dated 05 March 2004. The addendum was prepared to modify the location and boring.angle of:one <br /> proposed ozone pilot boring. <br /> Due to site activities, AGE.proposes to relocate the so 1 boring proposed in the.track wash area to <br /> 25 feet southwest of the proposed location.{Figure 1) In addition, AGE proposes to advance the <br /> proposed pilot boring ata 30 degree angle in order to extend the boring below the truck.wash area. . <br /> The soil boring will be advanced ata 30-degree angle approximate 351inear feet o�30 vertical feet <br /> below surface.grade (Figure 2). The proposed well will be-installed utilizing a-truck-mounted.drilI <br /> rig equipped with 8.25-inch diameter hollow stem.au ers. <br /> The ozone --sparge well will be.completed. with ariufacturer-assembled 2-inch by 30-inch <br /> microporous sparge, points and casings. The spare points will .be installed at-a depth`of - <br /> approximately 30.feet bsg <br /> in the water bearing zone. The well materials will be placed into the <br /> borehole through the-iiite'ri or of the hollow-stem auger.S.After installing the sparge point and casifig', <br /> filter pack material consisting of pre-washed 42116. and will-be added from the bottom,of the <br /> borehole to approximately two feet above the sparge pint. <br /> A nominal two-foot thick beritoriite seal will be place above the filter.pack of the well to minimize <br /> the potential of grout penetration into <br /> the filter pack o screened section-of the well. The bentonite = <br /> seal will be formed by pouring bentonite pellets into tile anhulus-and allowing them to.settle on:the <br /> .837 Shaw.Road;,S[&kton,, alifornia 95215 <br /> Telephone-(209) 467-1006' FAX(209) 467-1118 <br />