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San Joaquin County
<br /> OPO,U IN C
<br /> Environmental Health Department
<br /> 2: DIRECTOR
<br /> 600 East Main Street Donna Heran,REHS
<br /> Stockton, California95202-3029
<br /> PROGRAM COORDINATORS
<br /> Robert McClellon,REHS
<br /> ... Jeff Carruesco,REHS,RDI
<br /> �iFOR� Website: wwwsjgov.Org/ehd KaseyFoley,REHS
<br /> Phone: (209)468-3420
<br /> Fax: (209)464-0138
<br /> May 7, 2010
<br /> Mr. Paul Zumberge
<br /> Frontier Transportation, Incorporated
<br /> 3577 West Philadelphia
<br /> Chino Hills, California 91710
<br /> Subject: Frontier Transportation, Incorporated
<br /> 425 Larch Road
<br /> Tracy, California 95376
<br /> Dear Mr. Zumberge:
<br /> The San Joaquin County Environmental Health Department(EHD) has received and reviewed
<br /> Domestic Wells Sampling Work Plan, dated March 9, 2010, and Groundwater Investigation
<br /> Work Plan, dated March 10, 2010, both prepared by your consultant, Ami Adini &Associates,
<br /> Inc. (AA&A). In the Domestic Wells Sampling Work Plan, AA&A proposes to sample
<br /> groundwater collected from nearby domestic wells down-gradient of your site for analysis of
<br /> contaminants of concern. In Groundwater Investigation Work Plan, AA&A proposes to
<br /> advance eight direct-push soil borings to approximately twenty feet below surface grade (bsg)
<br /> down-gradient of your site and collect grab groundwater samples for analysis of contaminants
<br /> of concern. Results from the groundwater investigation will be used to determine the location
<br /> for a future off-site monitoring well. By letter dated September 15, 2009, the EHD had
<br /> directed you to complete the assessment of the extent of your plume in a down-gradient
<br /> direction, toward the west, and to sample the water wells closest to the source area, down-
<br /> gradient of your site, for analysis for petroleum hydrocarbon contamination related to your
<br /> unauthorized release.
<br /> AA&A proposes to collect groundwater samples from domestic wells located at 10631 and
<br /> 10723 West Larch Road, and at 21199, 21237 and 21171 South Tracy Boulevard, Tracy,
<br /> California. In addition to the addresses listed above, the EHD believes there are domestic
<br /> wells located at 21235 South Tracy Boulevard and 10607 West Larch Road; if these wells do
<br /> exist, then they, too, should be sampled. AA&A proposes to analyze the groundwater
<br /> samples from the domestic wells for total petroleum hydrocarbons quantified as gasoline
<br /> (TPHg), volatile organic compounds (VOCs), benzene, toluene, ethylbenzene, and total
<br /> xylenes (BTEX), methyl tertiary-butyl ether (MTBE), and fuel oxygenates. The EHD is not
<br /> certain what VOCs and fuel oxygenates (other than MTBE) will be reported so directs that the
<br /> analyses for ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butyl
<br /> alcohol (TBA), di-isopropyl ether (DIPE), 1,2-dichloroethane (1,2-DCA) and 1,2-
<br /> dibmmoethane (EDB) be reported. The EHD approves the work plan for sampling nearby
<br /> domestic wells with these modifications.
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