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San Joaquin County
<br /> Environmental Health Department
<br /> DIRECTOR
<br /> 1868 East Hazelton Avenue Donna Heran, REHS
<br /> a:
<br /> U)i � Stockton, California 95205-6232 PROGRAM COORDINATORS
<br /> Robert McClellon, REHS
<br /> ' ^ - Jeff Carruesco, REHS,RDI
<br /> Website: www.sjgov.Ory/ehd Kasey Foley,REHS
<br /> Phone: (209)468-3420 Linda Turkatte, REHS
<br /> Fax: (209) 464-0138 Rodney Estrada,REHS
<br /> Adrienne Ellsaesser,REHS
<br /> September 25. 2014
<br /> Mr. Paul Zumberge and Ms. Daren Zumberge
<br /> Frontier Transportation, Incorporated
<br /> PO Box 1848
<br /> Chino, California 91708-1848
<br /> Subject: Frontier Transportation, Incorporated
<br /> 425 Larch Road
<br /> Tracy, California 95376
<br /> Dear Mr. Paul and Ms. Daren Zumberge:
<br /> By electronic mail dated 09 September 2014, the State Water Resources Control Board (State
<br /> Water Board) requested that the San Joaquin County Environmental Health Department (EHD)
<br /> consider removing monitoring wells MW-2, MW-8, MW-13, MW-18, MW-24 through MW-26 and
<br /> dual-phase extraction well DPE8 from the monitoring and sampling schedule at the above-
<br /> referenced site. The EHD has reviewed historical and current groundwater analytical data in the
<br /> context of well locations and directs the following sampling schedule be implemented
<br /> immediately:
<br /> • Collect groundwater samples from MW-2 and MW-8 one additional time to confirm
<br /> declining trends of petroleum hydrocarbon concentrations before removing these wells
<br /> from the monitoring and sampling schedule;
<br /> • Discontinue collecting groundwater samples from MW-13, MW-18, MW-25 and MW-26;
<br /> • Collect groundwater samples semi-annually from MW-5, MW-17, MW-19, MW-20,
<br /> MW-21, MW-22, MW-23 and MW-27;
<br /> • Collect groundwater samples annually from MWA, MW-4, MW-9, MW-24 and MW-28;
<br /> and
<br /> • Collect groundwater samples from DPE1, DPE2, DPE3, DPE6, DPE8, and DPE11 one
<br /> additional time and evaluate the groundwater analytical results, comparing the analytical
<br /> data to groundwater results from the remaining wells that were sampled to determine
<br /> future sampling of these wells.
<br /> Analyze groundwater samples from MW-1, MW-2, MW-5, MW-8, MW-9, MW-17, MW-19,
<br /> MW-21, MW-22, MW-28, DPE1, DPE2, DPE3, DPE6, DPE8 and DPE11 for total petroleum
<br /> hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes (STEX);
<br />
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