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Work Plan for Additional"Subsurface Assessment and Remedial Action_—Former Uno; al.Stat_ion#2859: '
<br /> December 1 I,2001
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<br /> from entering the-well casing;"and therefore prevents the collection�of groundwater sampies`-froin`the wells:
<br /> _ A generalized rriicrosparging well construetion;detail is presented.in Figure 5
<br /> As part of the-KVA microsparging'systerri installation,Fa C-Sparge', will be mounted on two posts-
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<br /> "t The panel size is approximately.3]'' by"39''. "The panel includes an ozone generator, air compressor, and a
<br /> "programmable timer/controller. The ,micr'osparging-wells are-Connected'to,the panel ,by color-coded,
<br /> 318-inch OD LLDPE tubing,Each well point will.have a dedicated line. The tubing will be run through 2 or <•_ F
<br /> 4-inch Schedule 40 PVC conveyance.pipmg4or,.added protection: 'Power will,besupplied.'by a'120=volt," Y
<br /> .16 amp',single-phase service.
<br /> r• The system cycles ozone/arr injection,between the eight microsparge•wells.The,schedule"can�be'..v ied to K
<br /> match site specific conditions.The schedule will be varied as part"of:the system evaluation-process:
<br /> 4 " The projected radius of influence around eachymicrosparge well point is approximately'20 feet- Initially,
<br /> .the effectiveness .of the s_ystem`will be-monitored by checking'for-:the presence of bubbles"in existing
<br /> nearby rrionitoring wells. Existing monitoring'wells.surround ing-the`microsparge,wells wilLbe,monitored
<br /> monthly during the first six months of.operation to collect data that will be used to'evaluate the systems
<br /> effectiveness. In addition td the current sampling parameters, the dissolved oxygen content-iri.'surrounding
<br /> .; wells.will be,measure'd.
<br /> 4 Task 5 v Wellhead Surveyin
<br /> Followmg�installation, the elevation_of the'- of.well casings:for the newly' instal"led monitoring wells
<br /> will be surveyed to mean sea level".by"a California"1i-ensed surveyor`: Horizontalcoordinates:of all newly ;
<br /> installed wells will be obtained." r I
<br /> Task 6: Laboratory.;Analyses F
<br /> A.-
<br /> Selected'soil and groundwater'aarriples will;be submitted'for chemical analysis at`Sequoia;Analyfical; a:
<br /> California state-certified.Hazardous Material Testing."Laboratory`(ELAP #1210,.#1271 and"'#1624). Soil
<br /> < and groundwater samples" will' tie."analyzed for TPHg;-benzene 'toluene, etliylbenzene'and .xylenes
<br /> + = (BTEX);and zMtBE by DHS:L'UFT-IVlethod.` In addition,Ithe`;groundwater-samples,will be analyzed for r
<br /> ethanal, tert-butyl alcohol (TBA),''MtBE, ',diisopropyl.'ether'(DJPE), ethyl tert-butyl ethei (ETBE),
<br /> tert-amy.l:'methyl ether (TAME),- ethyl dibromide (EDB), and.4:2=dichloroethane (1,2 DCA) by EPA
<br /> 'Method-8260. The drill cuttings waste.'disposal characterization .sample.-will •be-analyzed for'TPHg,
<br /> BTEX, and MtBE by DH_ S,LUFT 1Vlethod,and"for lead byEPA Method 6010. '
<br /> Task 7 ;; Report Preparation t
<br /> Following xeceipt.and analysis of all data",'a' report will bd prepared that summarizes the procedures.and
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<br /> findings associated with this,investigation. This report-will' be.-submitted to Unocal for or,it and
<br /> distribution.
<br /> h 240072.06
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