|
.. si'•''.... "s- 5 ,.. y .� :„ '.1 .,,�. yF. ..„., 'z.^ Amy"',` •-- ."_.. r .; -� A,, v _s=- __.>h -�."`q ° '.' '3ci °a' ns�. „t.�
<br /> ,�
<br /> i �=.�;'; —..�r .,'s +�'�' �, `�""°;lt'e ,ks�#:.�+"`�k�'`x ,� ra. aa(,"�, 'ad�,.'�y' k.�.`5?;+-, yl �-•�..;, seK�Y. � t,,,��;�P� - � r-,
<br /> ro raFzo"r ,'�,'.� .r'�-+x 'y�i. rx ''r"..:�,: r s?y ';cr s'�'�r ,.;s.'. y a :.� ,a;, yy -�a: �., •`iw�.
<br /> z
<br /> a,
<br /> "��wfi r•� f,� _ 4. M - S, • � �A }•3 � . h� �5 hL Y � '�r�ti �,5 -- ��`f; �?�;r i it � i
<br /> ti r �� "y;r'i<� � "; �,' ..4� �S" .,���w i�, ��• -� 'fir '�' �rc�i: x-- •� �a'M �� � ,.,.�
<br />� a
<br /> FINAI Rr''Mr?DIA.TION PIAN
<br /> Shell 0:1 C_OMP
<br /> ,2A West Charter Way,Stockton,California
<br /> Delta Project No.40.88-586
<br /> I Page 18
<br /> i
<br /> E
<br /> 4.1 in-Situ Remedlation of Soil and Ground Water
<br /> In-situ remediation will be a:;comptished with minimal disruption to the existing site and opera ons.
<br /> 4.1.1 Soil Venting
<br /> Soil venting is the process by which petroleum hydrocarbons within the soil matrix of the vadose zone are
<br /> volatilized,thereby decreasing hydrocarbon concentrations inthe Published laboratory studies(Johnson,
<br /> 1987;Krishnayya,1S 1;Rainwater, 1988)and field studies(Awa tos,1988;Regalbuto,1988;P.C.Johnson,
<br /> f et. �J),as well as Delta's soil vapor extraction teak performed_at the,Site,indicate that sots venting is an
<br /> ns those typitxliy found
<br /> in gasoline)from soils.
<br /> -e�ectivc method to remove)ugiti�vapor pressure h}drotxurbo ( - _ t
<br /> at the site: Soij venting has alw proved effective to rca►oving floating product layers from ground water.
<br /> }' ri i ydrocarbons throuolt increasing '
<br /> i In ad3lttoa,sol!ventuig trill enhance to-situ btodegradatron of pettoleu*u#� „ W
<br /> the oxygen avatlablts for natural bacterial activity and growth iY4?time tPqultr�;,!c Soilartediauatth.
<br /> t
<br /> },~ sdil'venung is'csriniated to be relatively short,typlcallY less than„l year: For the re,�nSls.of.tliel Soil vapor
<br /> extraction test perforrned at this site,refer to Section 3.5 of this report.
<br /> 4.1.2 Ground Water Recovery
<br /> Gi+ound vrates.pumping will be used at this site to develop gradient control of the ground water to minimize;
<br /> off-site.mlgra
<br /> 66 of dissolved hydrocarborb;to 09105C 50!$'11at the water table til sail venting,and to recover'
<br /> dssolveG hydrocarbons. Due to the low specific yield of the wells,group
<br /> and tre,.i ground water Containing
<br /> _t
<br /> iwater volumes will be minimized A11 recovered groundwater fmai4hfs'site iv7sI lie't > r Gty
<br /> Bund water treatment system #
<br /> { :
<br /> saaitaiy. r system after pasststg through a gr _.._. .... .
<br /> l �
<br /> 4.2 Ground Wnter Treatment and Permits
<br /> � s i
<br /> E As previously mentioned,all rccovered.ground water,will be discharged to the sanitary seweritasystem. The
<br /> discharge must meet the criteria of the City's Ordinance Number 009 8C S, Chapter 7 of the Stockton
<br /> Municipal Code,Section 7,089.20. In general,the'ordinance requires the following: 4
<br /> }r
<br /> • Discharge TPH concentrations<100 ppmyt
<br /> s Environmental Protection Agency(EPA)601/602 analysis must bes i
<br /> CI O.for volatiles tested bv,U.S.
<br /> <4.5T mgll:.4
<br /> y✓ • Must have continuous lower explosive limit(LEL)monitoring that will shut the system down if air
<br /> concentrations in the discharge location exceed 10 percent of the LEL of gasoline. i
<br />
|