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Page 1 of 1 <br /> N <br /> Lori Duncan [EH] <br /> From: Ally Colavita [acolavita@advgeoenv.com] <br /> Sent: Friday, October 26, 2007 3: 18 PM <br /> To : Lori Duncan [EH] <br /> Cc: wlittle@advgeoenv.com; Robert Marty <br /> Subject: Stallworth Auto Sales, 602 N . California <br /> Attachments: 04 Stallworth A-A' with he 1007 Model (1 ). pdf; Stallworth Site Plan 0607 .pdf <br /> Hi Lori--- <br /> I met with Bill earlier today and we discussed the recommendation for a dual phase (DPE) pilot study at Stallworth <br /> Auto Sales on 602 N . California . <br /> The recommendation for DPE was made in order to remediate the contaminated soil within the saturated zone <br /> (approximately 30 feet bsg and below). MWAA and B would be suitable wells for a DPE pilot study as they are <br /> screened from 20-40 and 30-50 feet bsg , respectively. Minor free product was observed during the drilling of well <br /> MW-8, at the proposed location of the DPE pilot study (the area of MW-1A/B; attached site plan). <br /> DPE from MW-1A1B would reach the soil contamination within the saturated zone if draw down is achieved . The <br /> argument is that SVE would be effective in remediating the upper 30 feet of soil (vadose zone), but would not be <br /> able to reach the deeper contamination (as seen in the cross section attached) within the saturated zone. <br /> In addition , the current SVE wells could be utilized with a DPE system; essentially the SVE wells would be <br /> plumbed into the DPE system , vapor and minor water content would be extracted from these wells. Therefore, <br /> DPE has the potential to clean the shallow and deep soil contamination while treating the upper zone ground <br /> water contamination . <br /> We would like to do a DPE pilot study to evaluate the cleanup of the secondary source (at Stallworth Auto Sales) <br /> utilizing wells MW-1AIB and VW- 1 . I appreciate you taking the time to review this matter, and if you have any <br /> questions, please do not hesitate to contact me. <br /> Have a good weekend , <br /> Ally Colavita <br /> Staff Environmental Scientist <br /> Advanced GeoEn- or mental, Inc. <br /> 837 Shaw Road, Stockton, CA 95215 <br /> Phone : (209) 467- 1006 <br /> Fax: (209) 467-1118 <br /> acolavita aradvgeoenv.corn <br /> www. advgeoenv .com <br /> This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged <br /> information. Any unauthorized review, use. disclosure or distribution of this email/fax is prohibited. If you are not <br /> the intended recipient, please contact the sender by email/fax and destroy all paper and electronic copies of the <br /> original message. <br /> 10/26/2007 <br />