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1 <br /> Ms Margaret Lagorio Project No 880-040 1 <br /> V November 8, 2002 <br /> ' Page 10 <br /> provide downgradient control for the Parkinson's Arco site, so additional downgradient <br /> assessment for the subject site is not warranted at this time <br /> During the 5-day DPE test, approximately 23 pounds (3 7 gallons) of hydrocarbons were <br /> removed from well MW-1 by vapor extraction Approximately 19,700 gallons of <br /> groundwater was extracted from well MW-1 during the test Based on the average <br />' concentrations of dissolved TPHg, benzene, and MtBE reported in the groundwater <br /> effluent pumped from the well, approximately 7 0 x 10'5 pounds of TPHg, 4 4 x 10-6 <br /> pounds of benzene, and 4 4 x 104 pounds of MtBE were removed <br /> Based on the results of the DPE test, DPE appears to be an effective remedial alternative <br />' to remove MtBE and other oxygenates from soil and groundwater, and control off-site <br /> migration Shaw E & I recommends that a Corrective Action Plan be prepared for this <br /> site per UST Cleanup Fund guidelines <br /> If you have any questions regarding this work or require additional information, please <br />' contact David W Herzog at(916) 565-4377 <br /> Sincerely, <br />' Shaw Environmental & Infrastruct <br /> ar pR' 0 <br /> 1 David W Herzog, G No.7219 Ed K Simonis, RG <br /> Project Geologist Senior Geologist <br />' Attachments Figure 1 — Site L <br /> Figure 2 — Site Map <br /> Figure 3 — Groundwater Elevation Contour Map, Third Quarter 2002 <br /> Figure 4—TPHg/Benzene/MtBE Concentration Map, Third Quarter 2002 <br /> rTable 1 — Soil Analytical Data <br /> r <br /> rN lrancfpllProlectsTrolects1880104011 a101101Assessment and Interim Remedial Report doc <br />