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<br /> 28April19971.1 . -. _ r '� • r ' . �' - ''
<br /> AGE=,Project No..96-0232 '. a
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<br /> f sainplingevents:According'to the PHS
<br /> -EH) water depth was:approxirriately 12=feet below "
<br /> site grade and generally flowed in a,north direction
<br /> r
<br /> On'17 Jul ' 1992`and on l'8 June 1993, round water sampes were collected from a domestic wale
<br /> well located•a roximately 100,feet north oftlie UST ai ea (Figure,2)`: Petroleum h dracarbons:we're
<br /> pp y re
<br /> not`detected in the ground water Samples`collected on-either occasion. It is'our-understanding'from
<br />' the PHS-EHD that this domestic:water well has since.,beeir abandoned:-. 1
<br />' 2:3. UNDERGROUND STORAGE TANK REMOVAL''
<br /> On 3:1 March 1995; four .12 000-gallon.gasolirie USTsiand one -,12,000 gallon diesel UST were". .
<br /> replaced at`the'site. Durin '•excavation activities;,ground•water-was encountered in:the UST cavity
<br /> i I ! F
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<br /> g ,
<br /> at. approximately, 8• feet below'. site-grade (6sg) Furthermore, ,MW 3 •was destroyed during the r
<br /> excavation operation wUnder the°supervision of the PHS-EHD, soil and„ground;water samples were
<br /> collected at approximately 8,feet bsg from the side'wails of.the excavation by,Ground Zero Analysis,
<br /> Inc..(GZA), and subinitted to a.laboratory fqr. analysis, of petroleum hydrocarb'ons:.Petroleum'
<br /> ” hydrocarbons were; detected in ground. water samples,'.but were; not detected in soil:samples..r''
<br /> ''Analytical results Are summarized ih,Table I•-Analytical. Results of Soil Samples, and'in Table,2 -
<br /> Analytical Results of G;ah'Ground Wiater.Samples:
<br /> . On 03 and;•1.1 Apr11. 1995, ground water rwith.a petraleunl srieen was observed in the tank-cavity by .
<br /> GZA.:As'a result, the'ee additional•grab;ground Ai ater'samples were collected by GZA from within
<br /> the tank cavity Total:petroleum hydrocarbons g iantified`as gasoline and diesel'(TPH-g and TPH=d)
<br /> were• detected'in grab ,ground' water:samples ,at concentrations 'up to °.1,600 .and,T,4100,'icg/1,
<br /> respectively.•Arialytrcal Tesults are summarized in Table 2
<br /> On OS Ayril ` ` : ..
<br /> p 19,915,"soil samples were collected`by GZA beneath'the former,dispenser and product
<br /> lines at the site.',TPH='g uvas•detected'fn soil.samples collected"at`5 feet bsg from the eastern end `of
<br /> I of. ,
<br /> I:area(See Table Ilio 1, L3B}Sat a.cancent atiori of 1 5.erig/kg.,(inilligrams per kilogram {
<br /> r or, per'million) and BTEX'was d_etected_'at concent:Itrations up to:0:180 mglkgr Analytical'results
<br /> are surrirnarized'•ir Table I.
<br /> On ll and 12 April :;"995;-,the'UST cavity was'over ekcavated to.a_depth'ofiapprokimately 14 feet ,
<br /> bsg(approximately 180 additiorial cubic yards) in:orcl of r rit'
<br /> er;t emote.pore sally impacted,..saturated ,'
<br /> soil. Soil amp es brie�additional.:grab ground watera.sample`were collected fro1n,the!bottom of .
<br /> ' the.'UST..'cdvity': Petroleum; hydrocarbons were na't detected, in soil or ground water samples.
<br /> Analytical results are;surnmanzed in Table.l and in.Table 2.
<br /> On 2t=Apri1..1995 approximately 20,6ubic�yards bf soil was over-excavated from the eastern end,of
<br /> the dispenser/productline area. Additional soil sainples were collected at depths of approximately 3 ;
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