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it Page 1 of Vicki McCartney [EH] From : Andy Lojo [Andy. Lojo@anteagroup.com] Sent: Wednesday, December 17, 2014 6:26 PM To: Nuel Henderson [EH] Cc: Vicki McCartney [EH]; Regina Bussard i Subject: Summary of additional information , and request for Case Closure, Tracy Country Market Case # 0002070 j Attachments : letter from Mr Prejean. pdf; Tracy Tire Fire. png ; Chervon TAOC Gravel pits. png Dear Mr, Henderson After you and I spoke in October about your meeting with the Regional Water Board concerning closure of the Tracy Country Market site, we talked to John Muniz about the request to find and sample neighboring wells if possible . He knows the area and immediately knew who owned the nearest domestic wells near the property. The closest is located approximately 375 feet south of the UST area . He contacted the owner, Mr. Anthony Prejean and told him the County wanted him to sample the closest neighboring well (s) to rule out the possibility of migration of gasoline from his USTs. According to John, Mr. Prejean was adamant that he did not want his well tested . We asked John to write up notes of that conversation to document it for you. Instead he asked Mr. Prejean to write his own explanation . His letter is attached for your review. He declines to have his well tested at this time . Mr. Prejean also states personal knowledge that groundwater flows from south to north, which would make his well upgradient of the former Country Market UST's. Antea Group also researched the regional groundwater flow direction. While a detailed hydrogeologic evaluation was beyond the scope or budget available, we found reports from two cleanup sites, one located south (Tracey Tire Fire), and one north, (Chevron TAOC Gravel Pits) . Both reports, prepared by other consultants for other clients, state that groundwater flows north to northwest in this area. That correlates with Mr. Prejean's knowledge and puts the two domestic wells on his map upgradient of the site. The location maps for each site are attached . The links to those reports and relevant excerpts from the text are included below at the end of this email . We also found that an unlined irrigation canal is present south of the site, which could contribute to a northward groundwater flow direction in the vicinity of the site. City of Tracy 2010 Urban Water Management Plan . See figure 4: "BCID Lateral West" http ://www,water,ca ,goy/u rba nwaterm a n age m e nt/2010uwm ps/Tracy,%20City%20of/City%20of%20Tracy% 202010%20 U W M P-m a i n . p df Antea Group also performed a review of historical aerial photographs and topographic maps for the site vicinity in an effort to locate domestic or agricultural wells that might be active now. http ://www. historicaerials,com/aerials. php ?scale=2000&lon=-121.434296&lat=37,695686&year=2005 The Country Market building was surrounded to the north and west until at least 1993 by agricultural land . The closest farmhouse where a well may have been, was approximately 1,300 feet north of the site. Between 1993 and 2005, the parcel located north of the site was developed into a transit station and is now mostly occupied by parking lot. The parcel to the west appears to be a quarry. The Parcel located northwest of the site was developed into residential parcels. It is unlikely that such a recent residential development would include domestic wells however, and this area is supplied water by the City of Tracey http ://www.water. ca .gov/u rba nwaterma n ageme nt/2010 uwmps/Tracy,%20City%20of/City/20of%20TracV% 202010%20U W M P-ma i n.pdf The nearest residence in that direction is located approximately 310 feet northwest of the former UST area . The closest known domestic well is also over 300 feet away also, and in the likely up gradient or cross gradient direction as shown on Mr. Prejean's map (included with his letter) . All three features are more than 100 feet 12/18/2014