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_ Y t <br /> " <br /> DAMES &• MOORE r,r'R[?I1: 'I[`ti:,l IANIIrl=? f':,lil'�I:fltil111' <br /> �~ <br /> 17 1511_1t_A1{{_S'1iZlil7, lillf ?sn f=RFiti�Q,{ AL:1[)1t.i 1,193ri.: i.?i.3)? t "Ii <br /> Septembez• 21 , 1988 <br /> j5lj l;j o <br /> California Regional Water SEP 23 <br /> IM <br /> Quality Control. Board <br /> rNVERTI Lei <br /> 3443 Routier Road <br /> ENVIRONMENTAL <br /> Sacramento , CA 95827 <br /> Attention : Mfr . Gordon Boggs <br /> RE : Chevron :S . S . #96466 <br /> Pershing Avenue &. Robinhood Drive <br /> Stockton , California <br /> Dear ?lr . Boggs : <br /> Pursuant to our recent telephone discussion , 3 am <br /> enclosing for your review a copy of the report of chemical <br /> analysis for samples taken during the tank removals at the <br /> above-referenced subject property. Samples were obtained by <br /> others , and ,;were taken near the southwest corner of the tank <br /> excavation and product lines . The results of the chemical <br /> analysis condrrcLed on: those samples revealed petro1euIII <br /> contamination . "The waste oil tank removal sample obtained <br /> ne=ar tlic north side of the gasoline tank excavation also <br /> rc,,-ealed contamination but , to a much lesser degree ( lcz ppin ) . <br /> Several ground water monitor wells were observed at the <br /> subject property- and werereportedly installed ic1 1.9851, <br /> Co.l. towing an earlier discovered release . Ground mater is <br /> reported to occur typically at: approximately 39 ft . bel.oti tl:e' <br /> ground ,urface, <br /> The c_urcent tank excavation is approximately 12 f t . <br /> deep and within about 15 ft, . of the existing t,uildirl 11-1 <br /> ol1r, opinion , :Lny further excavation without shoringcotald <br /> irrfluenc:e the foundation performance of the adjacent <br /> building . it is therefore not advisable to e;:cavat;e zn�. <br /> deeper in the existing excavation as a remedial. <br /> Irr or.tr- opinion , an air venting system should he consi.[lerecl pis <br /> Cl remedial_ system for the contaminated soil . The attached <br /> drawing pr•es�nts a preliminary design of such <,. sysI-eim . £hi.s <br /> design concept has been shown to take advantage of Lhe <br /> g isol :i_ne ' s volatilizing vapors density being he.ivier Lhan <br /> a i T'he va l.at:.i les [ail]. therefore h t. e a t:.enrency t.o <br /> Iic�rl.r. the 'r;01:t.c,rrl e)f the Pc:�a gra".e I,ackCill. , the,ref(Dr <br /> ]?"r# or'rtl.C.,; p 'Ip ? Cgllec,t.ion syste111 l5 prOP0f;e a1,01 nd t.,h <br /> A srnail vacUU111 ne <br /> i.IIc.t L'�A L)11.FlCe .\'o 1ot ,. .E.'S f rom T._Iic til]1 I•: c`'_ C"<t\ <ttr:�fi . <br /> ke Sari Joaquin County ,iia' PC)Il.tit.arit Control. D strict, <br /> ti,JCAPCI.) vas cont;acted for their requirerreni:s for disch;ar-ing <br /> gasol. i.ne vol__it, i. ..c-s to the atmosphere . it + fi.7 understoo41 from <br /> t7F�li li: .VUIL i,I,'.V II`E_ <br />