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Hi ii~-~ ~ -1~~~~^ 1c~:.~r~, <br />1 <br />~ruce Scherzinger <br />LLSt ~S, ~~~7 <br />.~ <br />` ' ~ ~ ~ ~..- i <br />Post-it'° Fax ~lote <br />To ~ r <br />; Co.l~t. <br />phone ~t <br />Faz # f`.-r 7 , . <br />F , i21 <br />7671 Dare ~~ ~ P~~}' <br />v ; From ~-'- ~ <br />y / ~~^ <br />CiO. <br />Phane # <br />Fsx !~ <br />at ~Q-foat intervals and anaIyzed fc~r TPH-HCID. <br />If S or USTs are enet~ur~tered duri~g constru~~ioil excavation, it wi~I be investigated and. <br />t~e ediated in the sam~ ~nann~r as described ~reviat~sl~. <br />APp17.4ACA <br />' Sin e the cont~minants of concern are petroleurn products resulting from aperation af Y ISTs, the <br />pri ~zy clasiu-e approach for petroleum-contarniuated ~oil and gro~andwater vvill be OAR 340- <br />12 205 thraugh -360. Sa~ed on the fie~ci and an.alvtical results, a RBCA clasure approach rnay <br />~`~1 be tili2ed for same portions of the subject sit~. <br />~L~" <br />On e former C`.hevron p~rcel, grou~dti~vater closnre wauld f~e b2~sed on analyses conducted on <br />'a s les from az~- and off-site ~vells prior to decc~mmissicjning and remediaUconstruction <br />~ acti ities, ~~ ,~n ~~p1~~ from ~otenti~l excavation ~roundv~rat~r re~ha~.ge. It is anticip~ted that <br />su cient data vvould be cdllected during rern~dial a~ctivities ta support site closure without post- <br />}con truction installation of aif=site grou.ndwater manitoring wells. With the planned removal of <br />;the n-site snur~~ materia.l, future impact to groundwater is highly unlikely, especially since no <br />ig ~t~ant cort~i$tion has been observed to date during three ye~rs vf quarterly grotmdwater <br />',~no ~toring at the two off-site r~ells (M'VV-10 and I~FW_11 , <br />~ - <br />i ne buxlc~ng construction financin~ requires a I~EC~-approved wurk plan ro address <br />env onmental issu~s o~. the site. Therefore, yQUr prompf review and written r~spanse~Y <br />ne~'"1 ~ Sep em1~~' 1 g, 1 gg~~~~d be ~p~reciated to xnaintain the projeat constructzon schedule. <br />: y~u for the revi~w of this Work Plan. Please c~ll ~ne at (50~) 231-60~& if you hav~ any <br />ons. <br />~ Sinc~er~ly, <br />, ~7 <br />~ ~~ ~ <br />S .~. ~T81Ik8Ty p.~". `~~~t.l ~ -~ Cc. .•-. -t~ .X .~ . ~-. -~'--*, t.~ ` <br />Environment~~.l Engin~er ~j~~~--r- ( ~-- ~ ~.~.~ , !~-~-_ ~;=; < <br />~ r= .;i J G. , ~ ~ , /~.- ~_ --- _.- <br />nents: Table 1 ~ ti ~. ~- ,- ~~ ~ .~ ; ~- ~ ~ `- 4 ~-_ , ~~-~ '~. <br />Figures 1 and 2 ;. ~ ,- r c ~,~ ~ ~ ~_ ~,,_;, ~.,c_ ~- <br />, > ~~ -~ < <-. <br />,'f' ''-~-. ~ ~ .~ ~ ~- .~_ ~, ~ -~ ..._ ~-- L_ ~ ~ ~_~ ~_ . - ,. - <br />r <br />-r ` <br />/ -~ ~' J ~?---~- ( ~ -S I~t-"~ ~ .. ; <br />,.~ <br />J U V- ~`"Z--- J <br />~ ., y .~ ~ ~. <br />~ ~ ~ ~ ~ , _, <br />.--~ . ~,~.1C_ L z_ ( « ~ <br />-E-- ~ ~ G= ~l. <br />~ TOTAL F'. t~1 <br />~~j` ~ti ~1 ~~~ J I <br />1/ ~1.J ~ <br />~ ~~` ~ ~f ~ <br />