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Third Quarter 1999 Ground-vrater Monitoring Report Colberg Boat Works,401 North Stockton Street, Stockton,California Page 2 findings are summarized in their report, Phase I Preliminary Hazardous Materials Site Assessment, dated July 21, 1993 On December 12 and 13, 1994, Apex supervised the advancement of 11 subsurface probes to collect soil and groundwater samples at the site The results of the subsurface investigation are summarized in the report, Phrase II Site Assessment areas asr�oundepoi t, datethe faamer USTsJanuary 3, 195 The were9 impacted by of the subsurface investigation indicated petroleum hydrocarbons Subsequently, Colberg Boat Works was directed by the San Joaquin County Environmental Health Division (SJCEHD) to perform further investigations at the site Apex proposed additional subsurface investigation and groundwater monitoring installation at the site The proposed work was documented by Apex in Workplan foi Limited Subs tiface Investigation and Workplan Addendum for Limited Subsurface Investigation, dated May 2, 1995 and January 24, 1997, respectively On July 28, 1997, Apex personnel supervised the drilling of six soil borings, and converting the borings into six groundwater monitoring wells (Figure 2, MW-1 through MW-6) at the site The . results of the work were documented by Apex in Results of Subsurface Investigation, dated August 21, 1997 ich is on In April 1998, Apex submitted a cloareaure request for the former cont nu ng analyses foriesel tank location, hoxygenate the west side of the subject site and also recommended lis constituents with the exception of MTBE in wells MW-1, MW-2 and MW-3 Apex further recommended discontinuing analyses for TPHd in wells MW-1, MW-2 and MW-3 Apex submitted reports titled Work Plan for Pilot Test and Feasibility Analysis and Addendum to Work Plan For Pilot Testing and Feasibility Analysis, dated September 28, 1998 and January 20, 1999, respectively to SJCEHD These reports proposed the application of oxygen release compound (ORC)to MW-3 Before Apex was allowed to proceed with the ORC injection, SJCEHD requested that a mass balance be completed for the remaining TPHg constituents On April 2, 1999, Apex submitted the report titled Mass Balance for Remaining TPHg, which estimated the remaining mass of TPHg in the soil and groundwater at the Site Based on the results of the mass balance calculations contained in the Apex Mass Balance for Remaining TPHg report dated April 2, ld9m� SJCEHD Plardnot i For Prprove the Work lot Testing and Feasibility lot Test and Feasibility Analysis and Addendum Analysis, dated September 28, 1998 and January 20, 1999, respectively SJCEHD also stated that Central Valley Regional Water Quality not concur oncurtrol Board with a closure equestaff had SJCEHD requested ted on April 9, 1999 that the CVRWQCB would JJ D 1PR0JECTS\C'S\C0L0I 00t-COLBERG B04T WoRkS�QN[R0799\Q%IRTE`{T DOC