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I <br /> Chevron <br /> uChevron <br /> ., - <br /> _) r ,JAU 2'43 All I1; 441 <br /> Chevron Products Company <br /> January 15), 1997 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> San Ramon,CA'94563-0904 <br /> Ms.Mary Meays Marketing-Sales West <br /> San Joaquin County Environmental Health Phone 510 842-9500 <br /> P.O:Boa 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevron Station#9-4275,2905 West Benjamin Holt Drive;Stritkw , CA- <br /> Attached Typar Material Specification Sheet <br /> Dear Ms.1vleays: <br /> I would like to acknowledge receipt of your letter .dated December.5, 1.996.In that letter three conditions <br /> were listed that,when fulfilledby.Chevron prior to final inspection'of the service station construction, <br /> would facilitate your evaluation of the site. Chevron's response to each.condition is provided below.Each <br /> response is numbered according to the:corresponding.numbers.in your,letter._. <br /> 1)The remaining two vapof.ei-traction wells(GM=S-and.GM_.9)•are scheduled to be installed on-January - <br /> 24, 1997.Both wells are to be screened between 1.0 and 17 feet below ground surface. The planned <br /> locations and completion intervals of both wells are such,that their radii of influence should affect any <br /> shallow soil contamination that may remain in the vicinity of the former.piping trenches. <br /> 2)The attached data sheet was provided by the-supplier.of the trench liner material (Typar 3401)that is <br /> being used at the subject site. A copy of these-data has been.provided to Geraghty&Miller for use in <br /> their design and evaluation of the vapor extraction system.. <br /> 3)The condition to drill a.soil boring through the forine.r fuel tankpit to better define the vertical extent of <br /> secondary source of hydrocarbon contamination has been given muchconsideration. In considering <br /> this condition, Chevron has reviewed all soil analytical data from this vicinity and has conferred with <br /> its technical experts(Geraghty&Miller)about the request:As a result,there—appears to be no <br /> significant value gained by drilling such a boring that would enhance the design,performance,or <br /> evaluation.of the remediation system. Therefore, Chevron respectfully requests that you reconsider <br /> the condition to drill such a-boring. <br /> The initial start-up of the.remediation system has been delayed by the lack of an appropriate electrical <br /> hook-up and by prolonged periods of.rain. The electrical-hook-up has been cleared with PG&E,the vapor <br /> abatement equipment.has been secured, and the tentative system start-up date is February 14, 1997. <br /> In your letter you also requested that Chevron include Municipal:Wells#2 and#10 in its quarterly . <br /> sampling program. According to those:records made.:avail able to Chevron,Well#10-was formerly known <br /> as Swenson Park Well #2. Recognizing that both wells.are the same, Chevron has made arrangements. <br /> with the City of Stockton to sample Well#10,quarterly All-samples will be analyzed for the presence of <br /> TPHGas,BTEX(60 <br /> nstituents, and-MTBE. All results will be.included with the regular quarterly report. <br /> r <br /> #��ysiab►e <br />