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Project 113-13-05, Work Plan Page 2,f
<br /> ` Sut BA=CKGROUND - '
<br /> r
<br /> On February 25ed by California ar
<br /> , 1987, two 10,000 gallon steel tanks were remov
<br /> Petroleum equipment from the subject'site. Sax soil samples were collectedby t
<br /> h
<br /> 1 Xleinfelder dung tank removal, four from under the tanks and two under tYie
<br /> pump island: The samples were analyzed for TPH-g; BTX and total lead. Some ,
<br /> samples,had detectable amounts'of these compounds, as shown below.
<br /> d
<br /> r Sample l.I . TPH-gas benzene toluene xylenes lead
<br /> 1 1.2 0.018 ' 0025 - 0077 ? < 1
<br /> ~ 2 < < t ND<1.0 ND<0 010' ND<0.0i0 _ ND<0 010 1 c 1
<br /> 3 ND<1 0 - 0 030 ND<0.010` ND<0 010
<br /> 4 Nt7<1 0 ND<'0.010 ND<0 010' ND<0.010
<br /> ,5 >" 112 0.013 0417 ` i' 1.93
<br /> 6 _, 3 6' 0.028 0 046,w 0.147 4,
<br /> The saarpieg-we1re`also tested Jfor'ethylene dibromide, diesel, kerosene, motor loll,_
<br /> other pelroleum,hydrocarbons and C9 to C36 compounds.*The Samples were non, - t
<br /> detect fof those compounds.
<br /> Soil pile samples collected on'Febr'uary 26, 1987 showed no TPH-g,but had 1.3 and,
<br /> 5.3 ppm of C9 =C36 compounds,and,one sample had 10 ppb-toluene and 1,720 ppb,
<br /> xylenes. r r
<br /> On March 5, ,1987, Kleinfeldex consultants reported-that 3 monitor wells (MW-1 _
<br /> through MW-3) were installed on March 2, 1987, south,,north and northwest,
<br /> respectively, of the former underground storage tank location. The wells were
<br /> developed and�sampled March 3, 1987. Groundwater was encountered at 13 feet 'r ;
<br /> below ground,surface. All groundwater samples were m
<br /> analyzed for total petroleur
<br /> hydrocarb`onsas gasoline (TPH-g) and benzene, toluene, ethyl benzene and xylenes'
<br /> (BTEX).,All samples were non detect except for benzene, detected at 3 5 parts per
<br /> billion (ppb) in MW-1 and 13 ppb in MW-3.
<br /> On November 13, 1987, IQeinfelder requested to dispose of purge,and sample water -
<br /> collected from the wells. The purge and sample water collected April 28, 1987 was
<br /> non detect. On June 21, 1988, Xleinfelder report documented that groundwater '
<br /> samples Collected May 27, 1988•were non detect. The depth to groundwater was 20
<br /> feet below ground surface. In a November 12, 1990 report, Dames and Moore
<br /> documented that groundwater samples were collected on October 24, 1990 All
<br /> samples were non detect. Depth to groundwater was 25.3 feet below ground surface
<br /> A fourth monitoring well was installed at the site on September 6, 1991, by Parker
<br /> Environmental Services Soil samples analyzed from the boring were all non-detect
<br /> for TPH g and BTEX Groundwater samples obtained on September 11, 1991 from all
<br /> four morutonng wells were also non-detect for TPH-g and BTEX Depth to
<br /> groundwater was 28 to 29 feet below ground surface.
<br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317
<br /> Phone (415) 439-1024 Fax (415) 439-2566
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