Page 2 - dtsc0817

HY I CLEANUP ECES ARY?
h mi al uch a p ta ium and magn sium
p rchl rate (u ed in flare) and ammonium
p rchlorat (u ed a olid r cket fu 1) were handled at
th facility. ndu trial olvent such a
trichl · r ethen (fCE) and t trachloroethene (PCE)
·ere u ed for deanin part in manufacturing and
peration . a te handlin that w re done in
accordanc with the acceptable practice of tho e
time re ulted in th relea e of wa te chemical to oil
and groundwater hen ath the ite. Due to it high
olubility and mobility, perchlorate was moved b
groundwater a con iderable di tance, e entually
reaching the nearby ff-sit water production wells.
A a re ult, six water production well for the
community that had low le els of perchlorate were
hut down in 1997. To protect the groundwater
resources, it was necessary to contain and cleanup the
affected groundwater at the site. The oil under the the western border of the site to capture
former operation areas impacted by perchlorate and contaminated groundwater. In addition 24
olvent needed to be cleaned up. fter CllC performance monitoring ·ells have been installed to
defaulted, the Department of Toxic Sub tances e ·pand the existing groundwater monitoring wells
Control (DTSq i ued a cleanup and abatement network to monitor and confirm capture of
order to Whittaker to examine and clean up the soil contaminated groundwater at the site. Over 15)000
and gr undwater in the source areas beneath the site. feet of piping ha been installed to convey extracted
Whittaker ha hired everal pecialty contractor to water to the treatment sy tern located near the
conduct soil and groundwater investigation and northern boundary of the site along Soledad Canyon
cleanup in compliance "With the DTSC order. Road. The treatment facility is equipped to remove
the site chemicals from the extracted groundwater.
HOW IS THE SITE BEING CLEANED UP? Alo, a pilot-scale permeable reactive zone that was
Under o Ter ight of the DTSC and ther regulatory installed in subsurface along the n rthwestem
agencie , Whittaker has worked with th local water boundary of the site near the etrolink station in
companies to re tore lo t groundwater production for 2015, will be e "panded to capture and treat chemicafs
the communi by importing drinking water and b in shallow water near the northern site boundary.
installing well-head treatment faciliti for the
impacted wells. As a re ult of the e effort , two of The o erall goal of the ite cleanup program is to
the pr duction ells that were hut d wn in 1997 cleanup area of the ite where pa t wa te handling
ere re tarted in 2 1 and a third well will b peration re ult d in chemical relea e t oil and
restarted in 2017. Addi ti nal efforts for in tailing gr und'1 ater the t may pre ent an unacc ptable risk to
replac ment well by th ater purveyor are m human h alth or the en ironment. The method are
progr carried out ithin th general c · nte t of a cleanup
plan that include tw primary pr c ses: in itu il
The gr undwater pump ~nd treat sy tern a vap r xtraction t remo e olatile organi
d sign d to captur and clean up c n aminat d eep c mpounds (V C ) from th ub urfac oil ; and,
ground'1 at r b n ath th it . i ht xtracti n w 11 .. ca arion and itu bi remediation f the ils
du t rs hav be n install d t multip1 d pth al ng impacted ith p rchl rat .