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'ENVIRONIhENTAL HEALTH %EPARTMENT
<br /> PpUIN
<br /> SAN JOAQUIN COUNTY
<br /> a Program Coordinators
<br /> Q Donna K. Heran, R.E.H.S.
<br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S.
<br /> Laurie A. Cotulls,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I.
<br /> . °s' s`-NSP Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S.
<br /> �i F o R Robert McClellon, R.E.H.S.
<br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S.
<br /> Website:www.sjgov.org/ehd/ Kasey Foley,R.E.H.S.
<br /> PAUL ZUMBERGE AUG 2 8 2006
<br /> FRONTIER TRANSPORTATION INC
<br /> 3577 W PHILADELPHIA STREET
<br /> CHINO CA 91710
<br /> RE: Frontier Transport, Inc. SITE CODE 2251
<br /> 425 Larch Road RO: 252
<br /> Tracy, CA 95376
<br /> San Joaquin County Environmental Health Department (EHD) has reviewed 2006 2"d
<br /> Quarter Groundwater Monitoring Report dated August 2, 2006, and Interim Corrective
<br /> Action Plan Revisions (ICAPR) dated August 11, 2006, submitted by Biophysics
<br /> Environmental Assessments, Inc. (BEA) for the above-referenced site.
<br /> It is apparent that the methyl tertiary-butyl ether (MTBE) plume is spreading to the north
<br /> and west of the former underground storage tank locations based on groundwater
<br /> analytical data collected on June 23, 2006, for shallow monitoring wells MW-4, MW-8,
<br /> MW-9, and MW-20, screened at approximately 5 to 20/25 feet below ground surface
<br /> (bgs), and deep well MW-18, screened at 30 to 40 feet bgs. To determine the extent of
<br /> the MTBE contamination, EHD directs that each monitoring well, MW-1 through MW-
<br /> 21, be sampled during the third quarter groundwater sampling event. Measure the depths
<br /> to water, and total well depths for each well and measure the free product currently found
<br /> in MW-2 and MW-21. If MW-2 and MW-21 have measurable amounts of free product,
<br /> insert passive skimmers to remove the free product. Also, include the analyses for 1,2-
<br /> dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB), both reported at 0.5
<br /> micrograms per liter(µg/L), if possible, in addition to analyzing the groundwater samples
<br /> for total petroleum hydrocarbons as gasoline (TPH-g); benzene, toluene, ethyl benzene,
<br /> and total xylenes (BTEX); MTBE, ethyl tertiary-butyl ether(ETBE), tertiary amyl methyl
<br /> ether (TAME), tertiary butyl alcohol (TBA) and di-isopropyl ether (DIPE). Submit the
<br /> preliminary analytical data to EHD upon receipt from the laboratory and prior to
<br /> submitting the third quarter monitoring report.
<br /> EHD believes additional monitoring wells may be necessary to delineate the lateral extent
<br /> of the MTBE plume. This decision should be based on the analytical results collected
<br /> during the third quarter groundwater monitoring event. If the analytical data confirms
<br /> that the MTBE plume is spreading, you are directed to submit a work plan for additional
<br /> monitoring wells to EHD within thirty days of receipt of the laboratory data.
<br /> A year has gone by and EHD has not received a report for the installation of monitoring
<br /> wells MW-19, MW-20, and MW-21, completed in August 2005. EHD needs this
<br />
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