Laserfiche WebLink
♦1 � <br /> MTBE concentrations in monitoring wells EW-1,MW-2,MW-3,and MW-4 continue to be non-detect. <br /> Monitoring well GMX-1 has developed trace amounts of MTBE, 7.3ppb. TPHg has decreased <br /> dramatically in EW-1(80%),GMX-1(96%),and MW-2(69%). TPHg has remained non-detect in MW-3, <br /> and MW-4. BTEX compounds have decreased dramatically in EW-1(61%), GMX-1(98%), and MW- <br /> 2(80%). The BTEX compounds remain non-detect in wells MW-3, and MW-4. <br /> Samples from the extraction well indicate that TPHg has dropped 80% and BTEX compounds have <br /> dropped 96 to 100%. <br /> The proposed clean up levels from the approved "Final Remedial Plan" and the average remaining <br /> concentrations are as follows: <br /> Compound Concentration Goals Averse Remaining, Concentrations <br /> Benzene 0.005mg/L ND <br /> MTBE 0.001 mg/L 0.0015mg/L <br /> TPHg 2.Omg/L 0.00087mg/L <br /> All together 842,626 gallons of water had been removed and treated to non-detect. The total estimated <br /> mass of TPHg on 6/11/02 was 27.2 Kg(9.75ga1). The estimated mass of TPHg remaining after pump and <br /> treat is 2.05Kg(0.73gal). The estimated mass of TPHg removed was 25.15Kg (9.02gal). This is a 92% <br /> reduction in total mass of TPHg. <br /> After recovery from pump and treat the groundwater surface was 1.5'lower than the level in March,2004. <br /> The direction of flow was South-East with a slope of S=0.0016. <br /> Conclusions <br /> The dramatic reduction in pollutant concentration is attributed to the pump and treat process. Pumping <br /> has brought the plume to the surface for treatment and disposal. All remaining constituents have been <br /> brought within the EPA's drinking water standards. <br /> Request for No Further Action <br /> Foothill Engineering recommends that the San Joaquin County Public Health Services, Environmental <br /> Health Department issue a letter stating no further action is required for this site. <br /> Please contact Mike Vlach at(916) 729-5184 if any questions arise concerning this report. <br /> Respectfully submitted, <br /> QRoFESS! �c <br /> Foothill Engineerin �� 0 RU Fy <br /> 57707 <br /> * EXP.12-31-05 <br /> Mike Vlach, P.E. sT crvs� �,�� <br /> 9I ",-" ,Gni '71I3lL4y <br /> • Attachments:Groundwater sample Analysis Recap,Site Map,Del-Tech Field Report,Laboratory Reports <br /> cc: Diana Maragos, Attorney for Sun West Liquors, W. T. Mitchell Group <br /> 3 <br />