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<br /> ATC Associates Inc
<br /> 1 117 Lone Palm Avenue, Suite B
<br /> (VkTcModesto, California 95351
<br /> 209-579-2221
<br /> ASSOCIATES I NC Fax 209-579-2225
<br /> OTHER ACTIVITIES
<br /> PZIa (s), ASI(s) and ASI (d) were properly abandoned on January 24 and 25, 2005 according to
<br /> ATC's Work Plan for Domestic Well Destruction, dated October 26, 2004
<br /> ANALYTICAL RESULTS
<br /> TPHg was detected in MW1, MW2, MW3, MW4, MW6, MW7, MW8, and DW in
<br /> concentrations of 26,000 micrograms per liter (ug/L), 120,000 ug/L, 88,000 ug/L, 1,300 ug/L,
<br /> 55,000 ug/L, 6,000 ug/L, 4,400 ug/L and 11,000 ug/L BTEX components were detected in
<br /> MWI, MW2, MW3, MW4, MW6, MW7, MW8 and DW The highest concentrations of
<br /> benzene, toluene, and xylenes were detected in MW2 at concentrations respectively of 25,000
<br /> ug/L, 21,000 ug/L, and 27,000 ug/L The highest concentration of ethylbenzene was in MW3 at
<br /> 5,600 ug/L The groundwater samples collected from MW5, MW9, and MW10 contained no
<br /> detectable concentrations of TPHg or BTEX
<br /> Groundwater samples collected from MW1 through MW10 and DW did not contain detectable
<br /> concentrations of MTBE by EPA Method 8021B
<br /> . Analytical results of groundwater samples are summarized in Table 2 Laboratory data sheets
<br /> and chain-of-custody documentation are contained in Attachment 2
<br /> CARBON FILTRATION SYSTEM
<br /> In May 2002, a granular activated carbon (GAC) filtration system consisting of two 200-pound
<br /> high-pressure liquid phase carbon canisters was installed to remove petroleum hydrocarbons
<br /> from DW System samples collected from the first and second effluent ports are identified as
<br /> 1 CC Effluent (sample after the first carbon canister) and 2CC Effluent (sample after the second
<br /> carbon canister) in the filtration system
<br /> Sampling of the filtration system was conducted monthly during the First Quarter 2005 On
<br /> January 21, 2005 target analytes (i e , TPHg, benzene, toluene and xylenes were detected in ICC
<br /> Effluent but were not detected in 2CC Effluent On February 21, 2005 high concentrations of
<br /> TPHg and BTEX components were detected in ICC Effluent, but not 2CC Effluent On March
<br /> 4, 2005 target analytes detected in 1CC Effluent TPHg was also detected in 2CC Effluent (i e ,
<br /> breakthrough occurred) at 190 ug/L BTEX was detected in the 2CC Effluent at 50 ug/L, 19
<br /> ug/L, 22 ug/L and 3 1 ug/L respectively Analytical results are summarized in Table 3 and
<br /> analytical data is contained in Attachment 3 The chain of custody for samples taken on January
<br /> 21 are dated December 21, 2005 in the sample description All samples were taken on January
<br /> 21, 2005, which is reflected by signatures and laboratory documents
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<br /> S\I63931REPQRTSl]stgtr-2005 doc 4
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