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<br /> I December 16, 1993 _
<br /> Project Number 113.26M
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<br /> ,, :Dear Mr •�Ohn�On.� ,r t' F -:=11
<br /> We are.forwardinglthe fourth'quartefs re'port'for,your.facility at 15 Fast Grant Line
<br /> Road; Tracy: Copies,of this report should be.€orwarded to"
<br /> San joequui Caunty and
<br /> the Regional Water_Quality Control Board at the addresses at the end of Iles report. _
<br /> 3 _
<br /> 41
<br /> Two gasoline tanks were renmdved from`the property on IVlarch 3, 1988
<br /> Groundwater was.observed-at 7 feet BGS (below,grade surface). The tank excavation
<br /> . was emptied`and:water:was sampled.prior to-the new,tank ins#allation: Three
<br /> groundwater monitonng'wells were installe'd„'in APril., 1988-and.a fourth well,in r
<br /> 1988, showed TPH otal_ Petroleum
<br /> May, 1988. Water sample analysis in May, -g (T _
<br /> Hydrocarbons as gasoline) at 140µg/L,and benzene at 2.7 Rg
<br /> Monitoring P well 'Sampling was done by Parker Environmental Services in
<br /> September, 1992, Free product (approximately one inch) was found in MW-4, which
<br /> is by the tanks near-the store front-,.,MW-2 had a soil blockage at six feet BGS. TPH'-g
<br /> was present in MW-1 (220 µ M
<br /> µg/L),benzene-in W-1,(2.1:µg/L) and MW-'3 (0.7 µg/L), - ._
<br /> toluene and xylenes in-both, and ethylbenzene in 4 only ' s
<br /> The soil blockage in MW-2 was removed from the well by Parker Environmental
<br /> Services in December, 1992. Evidently a cup filled with dirt was lodged in the'well
<br /> casing. The cup was forced to the well bottom (291 and will not impair water flow to
<br /> the well. Well measurements taken at"the same time showed the groundwater
<br /> direction flow to be toward the north (see attached drawing).
<br /> Recycled Paper
<br /> 190 East 7th Street • Pittsburg, CA 94565-2317 • FAX (510) 439-2566 • Phone (510) 439-1024
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