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� UNDERGROUND <br /> ENGINEERING& <br /> f ENVIRONMENTAL <br /> SOLUTIONS <br /> Haley&Aldrich,Inc. <br /> D 117 3 West Carrillo Street <br /> { J �VI D Suite 201 <br /> Santa Barbara,CA 93101-3283 <br /> RPR 2 12003 Tel: 805.899.9224 <br /> Fax:805.899.8365 <br /> HALEY 17 April 2003 <br /> ENVIRONMENT HEALTH www.HaleyAldrich,com File No. 29629-000 PERMIT/SERVICES <br /> ALDRICH <br /> ff <br /> San Joaquin County 1 <br /> Environmental Health Department l <br /> 304 East Weber Avenue,Third Floor j <br /> Stockton, California 95202 <br /> Subject: . Site Investigation Work Plan <br /> Former ContiGroup Grain Elevator <br /> Stockton, California <br /> Dear Mr. Wong: <br /> Thank you for.'eonditionally'approving ContiGroup's work.plai :for a site imestigat�on at the <br /> Or>ICEs former-Stookton Grain-Elevator in 'your.4 February 2003..letter ,-This letter serves as1an _ <br /> addendum to the;work plan'(Haley&Aldrich,Decernber12002),;a13d,eYplams the refinement <br /> Massachusetts Boston of our site investigation, iheorporating your_suggestloris :.In�accordarice with,the a omn-�ents:, <br /> and coiidlt'i'onsfsectidn:of your•4;February etter,,;wc propose,the,following changes to the <br /> Cleveland work plan: <br /> Ohio „ . . . x <br /> .Dayton One of the proposed borings will be moved approximately twenty,feet northwest from <br /> Ohio the originally proposed location in order to better delineate the lateral extent of . . . <br /> Denver contamination. This boring will also be extended to a depth as necessary to collect two <br /> Colorado consecutive samples lacking field indication of contamination or until refusal. <br /> Detroit <br /> Michigan The deep boring locations proposed in the former tank pit area will also be advanced.to <br /> depths as necessaryto collect two.-consecutive samples lacking field indication of <br /> i Hartford 1 1 <br /> * rf .,l t o-c f+t, tw bnr�prrc-!P.thP tat��c_ri._arP_.a — <br />�- - Connecticut - coritarnljiation-or ui 'I:, r .'u5. Ti, i1 PrP i e-two . a i <br /> t be converted to a groundwater monitoring well (MW-7) and will be screened across an <br /> Los Angeles <br /> California interval.of approximately 30-35 feet bgs to assess possible:contamination in this.deeper- <br /> portion of the aquifer. According to data from previous investigations (see boring log <br /> Manchester SB12, drilled in June 2000) sediment in this depth interval consists of sand and fine <br /> New Hampshire <br /> sand. <br /> I Newark <br /> New Jersey The number of proposed soil borings has been increased from,10 to up to 18_in response <br /> Portland to your request for an extended grid pattern in the area defined by the former tank area, <br />� <br /> Maine SB-4.and MW-3. As shown:on figure one, the proposed soil borings are arrayed in a <br /> Rochester == .grid:pattern:treriding toward:the­northeast:.The first4 o;rows(cod sisting.ofnine sail <br /> New York borings)"will`be cofnpleted first. Each subsequent-row xvill.be completed-only,if there., <br /> 1 San Diego q- �� are field indications•of Significant im act visual,h drocarbon stainin or elegy dted PID <br /> gn .p ( y �b ... .,. -,,�. <br /> California 'readings)-ih,samples trorri the previous row:_.Bv,including the.co�.�ttngency prov►slon, we <br /> Tucson can complete delineation of the lateral extent of-the contamination.t1.o the.north and; <br /> Arizona northeast of the former tank area in comprehensive and efficient manner. <br /> Washington <br /> District of Columbia <br /> 1 <br /> Prinlyd an recycled Paper. <br />