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<br /> Wort:-Plan for Additional Sub race Investigation
<br /> Colberg Boat Warks,401,North Stockton Street;Stockton,Califbrnia,k' ;
<br /> Page 2
<br /> On May 16, 1986, Jim Thorpe oil,;Inc.-removed two 550-gallon diesel; one 8;000-gallon diesel;'and one �
<br /> 1,000-gall' In gasoline LJSTs from the.'site. .The area around the former gasoline UST was,over-e)�cavatec
<br /> in 1988: j
<br /> In I~ebru' ary 1993,Telic Engineering Corporation(TEC}'of Stockton, California'perfortrled.a Phase I
<br /> " investigation of the subject site and surrounding area•,,vvithin•a one-mile.radius. TEC's-findings are.
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<br /> sumiriarized in their re'portj Phase I Preliminary Hazardous 11lc�ter~ ctZs Site assessment, dated July 21,
<br /> 1993. ,
<br /> On December 12 and 1', 199 ,Apex supervised the advancement of I.l subsurface probes to collect soil
<br /> 1 ° apd;groundwater samples at 4the site. The results of the subsurface investigation are utnmarxzedin'the'
<br /> report,Pliise 11 Site.Assessment Report, dated January 23, 1995. The results of the subsurface
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<br /> investigation indicated that areas around the'former-USTs were impacted by petroleum'hydrocarbons.
<br /> ` Subsequently,-Colberg Boat Works was directed by SJCEHI)to;perform,further investigations at`the F
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<br /> site.' Apex proposed additional'subsurface•investigation and�groundwv ler monitoring installation at the '.
<br /> site, The proposed work was documented by Apex in,Work Plan for Limited Subsurface Investigation
<br /> and Tock Plan Addendumfog Lirnitecl,Sttbsuface. nvestigatic�n, dated May 2 1995 and January 4,•
<br /> I997, respectively.
<br /> On July 28,"1997, Apex personnelsupervised the drilling of six Soil borings;which were converted into`
<br /> six groundwater monitoring wells,(Figure-2, ,�l through MW-o) at,the site. The results of the work
<br /> were dcicumented by Apex in Results of Si�bsuiface Investigation,dated August 21,.1997:
<br /> In April 1:11998,Apex submitted a closure request fair the former diesel tank location, which is on the west *.
<br /> side of the subject site and also recommended discontinuing analyses for oxygenate constituents with the.
<br /> exception of MTBE in wells MW-I, and MW-3, Apex_lurther recommended.discontinuing '
<br /> i analyses for TPHd in wells M -1,MVt1-2 and*MW 3 _
<br /> Apex submitted reports titled Work Plan for.Pilot Zest and peas bility."Analysis acid Adt enc�ir�n to Work
<br /> Plan Far Pilot Testing and Feasibility Analysis, datedtSeptember 28,-1998 and January 0, 1999, Y,
<br /> 4 respectively`to SJCEHD. These repiirts proposed the application of.oxygen release compound(ORC)to
<br /> MW-3.
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<br /> Before Apex was allowed to proceed with the OkOnjection, JCEHIJ requested that amass balance be ,
<br /> com leted for the remaining TPH constituents, Un;April 2, 1999,Apex submitted the report titled
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<br /> Mass Paid'nce forBalanceR main ng.TPHg,which estimated'the remaining mass of TPHg in the soil And
<br /> i groundwater at the Site. 'r_
<br /> Based ori,the results of the mass balance calculati ris contained.inthe Apex Mass Balance for-, }
<br /> t ,` Remaining TP.Hg report dated April"2; 1999, SJCEHI) did not apprcive the Work Plan for F,'ilot Test and`
<br /> Feasibility Analysis and Addendum to:Work Plan F&Pilot Testing and Feasibility Analysis, dated,
<br /> ` September 28;1998 and January 20,--1999,respectively. SJCEHD.also stated that Central Valle
<br /> Regional Water Quality Control Board:(CVRWQCB) staff liad-indicated on April 9 1999 that the
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