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• Page 2 of 2 <br /> exposing a greater area to soil-vapor extraction. <br /> . Remediation well DPE-2 is proposed solely to address the significant <br /> hydrocarbon-irr pact at depths between 25-45'. Because it is anticipated <br /> that EW-1, EW-2 and DPE-1 will eventually dewater the UST area to depths <br /> of 30 feet bsg, hen at a minimum, it is reasonable to expect that the <br /> screened portioi in DPE-2 at depths between 25-30 feet bsg can be <br /> dewatered and xposed. <br /> . Based on an aqu fer pump test conducted at the site in March 2008 (see <br /> attached), the round water level at EW-1 was induced to a depth of 30 <br /> feet after 7 ho rs and at extraction rates between 2-3 GPM. Because the <br /> ground water I vel was induced below the bottom of the pump, the aquifer <br /> pump test was erminated. It is therefore reasonable to assume that the <br /> ground water I vel will be induced to depths greater than 30 feet bsg. <br /> . Because the DPE stinger can be set to a desired depth, high vacuum <br /> extraction is an effective remediation tool in isolating specific hydrocarbon <br /> impact at select depths. High vacuum extraction (even w/o a dewatering <br /> effect) is still a mechanism for extracting the dissolved and the adsorbed <br /> portions of hyd ocarbon impact at isolated depths. <br /> Please let us know if y u have any further questions. <br /> Thanks - Tim <br /> Timothy J. Cuellar <br /> Senior Project Geologist <br /> Advanced GeoEnvironrr ental, Inc. <br /> Stockton • Santa Rosa • Monterey • Brea • Spokane • Reno • Dallas <br /> 1-800-511-9300 <br /> tcuellar@_advgeoenv.com_ <br /> www.advgeoeny.com <br /> This email/fax message is for the sole ise of the intended recipient(s)and may contain confidential and privileged information.Any <br /> unauthorized review, use,disclosure o distribution of this email/fax is prohibited. If you are not the intended recipient, please contact the <br /> sender by email/fax and destroy all pa er and electronic copies of the original message. <br /> 8/29/2012 <br />