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J <br /> LIGHT, AIR & SPACE CONSTRUCTION <br /> ENVIRONMENTAL SERVICES COMPANY <br /> i <br /> State Contractor's License Number 445403 <br /> State EPA R.E.A.Number 04072 <br /> Office 408-979-0661 <br /> The contaminant mass estimate in groundwater used the UST pit sample and groundwater well <br /> samples. A rough estimate of the quantity of dissolved TPHD is 0.01 gallon. A rough estimate <br /> of the quantity of dissolved TPHG is 0.001 gallon. TPHD was not observed in monitoring wells <br /> sampling. The one detection of TPHG in MW-1 in 2008 was noted by the laboratory as not <br /> resembling the typical pattern for gasoline. MTBE was detected only in Well MW-3 in March <br /> 17,2009 at 4 Ug/l, below the MCL of 13 Ug/l. <br /> I <br /> 14.0 Risk Assessment Model ! <br /> A risk assessment model was not performed for this site. <br /> 15.0 Transport and Fate Models <br /> A transport and fate model was not performed for this site. <br /> 16.0 Remaining Conditions at this Site <br /> It is our opinion that the remaining conditions at this site will not adversely affect water quality <br /> for human health or other beneficial uses. The source of the petroleum fuels (USTs and affected <br /> soil) has been removed. The March 2009 groundwater samples from monitoring wells MW-1 <br /> and MW-2 adjacent to the former UST pits show that contaminants are not present. MTBE <br /> detections at well MW-3 are well below the current MCL. A sample taken from the on-site <br /> drinking water well showed that contaminants were not detected in the well. The UST removal <br /> and soil excavation removed the residual fuel source, with only one detection of MTBE that was <br /> present in MW3 in the December 2008 and March 2009 sampling events. In our opinion, the <br /> monitoring well data does not show a dissolved plume with the exception of the two MTBE <br /> detections; the source of this extremely low MTBE is not known; and MTBE was not detected in <br /> any other soil or groundwater sample. Therefore, no threat to the on-site drinking water well or <br /> other water wells in the area is indicated by this data in our opinion. <br /> 17.0 Technical Reports ' <br /> The technical reports for this site are listed in the References. <br /> i <br /> 18.0 Additional Comments <br /> There are no additional comments for this NFAR report. <br /> Page 9 of 16 <br /> MAIN OFFICE • 1707 LITTLE ORCHARD STREET,SUITE A •SAN JOSE•CA•95125 <br /> MAILING ADDRESS•P.O.Box 36303•SAN JOSE•CA•95158.6303•4081979-0661 -4081979-0621 FAX•LASCONST@AOL.COM E-MAIL <br /> GENERAL AND ENGINEERING CONTRACTOR•HAzARDOUS SUBSTANCE REMOVAL CONTRACTOR-SITE ENVIRONMENTAL ASSESSMENTS <br /> WETLAND AND RIPARIAN HABITAT—ASSESSMENT—DESIGN—RESTORATION—CONSTRUCTION—MITIGATION MONITORING <br />