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<br /> pnW LEM ASSESSMENT TVMTT
<br /> IWWOM GJARMILY MOHiI ING fk]KXIT
<br /> 1399 Eat YGselnoe Avenue,Men'^:a,calitornia
<br /> As shown on the hydrograph on Figure 6, groundwater levels at the site have fluctuated
<br /> during 1991. The highest groundwater elevations were observed on March 1, 1991, and the
<br /> lowest elevations on May 2e; 1991.
<br /> r�
<br /> 3.6 Groundwater An al_yticgl Results
<br /> Groundwater samples were collected from monitoring wells
<br /> MW-2
<br /> February
<br /> , and MW-3 on
<br /> s also sampled on February 27, 1991, Samples
<br /> February 1 and April 23, 1991• MW-1A wa
<br /> were collected from monitoring wells MW-1 B, lMW-a MW-3,
<br /> -4,and
<br /> ed on June
<br /> duplicate the
<br /> July 22, 1991• The July 22, 1991, sampling
<br /> June 2fi, 1991, sampling, as the laboratory analyzed the June 26, 1991, samples after the
<br /> yzed for STEX, ECD,
<br /> required holding time had expired.
<br /> xb r EPAll
<br /> lMethod 8260 and CAL DHS Draft-npleS were lTPH (modified), The
<br /> EDB, and TPN, as oundwater sai
<br /> gas Y
<br /> water sample from MW-5 was additionally analyzed for total coliform and fecal coif lorrmrby
<br /> Mum-
<br /> MO-MUG (Minimal Medium ONPG (0
<br /> the
<br /> - Mtro he nl-B-d GalactoP,ranaside) ( -
<br /> e
<br /> belliferyl-B-d-Glucaronide)) test,
<br /> /zed from umtlD MW-5 during el
<br /> Groundwater samples collected and analof petro hY vedem ion limits.
<br /> sampling did not contain concentrations
<br /> However, MW-5 contained greater than 23 MPN/i00m1 (Most Probable Number per
<br /> 100 milliliters)of total coliform and fecal. Groundwater from MW-1 B contained concentrations
<br /> -'' xylenes, EDB, EDC, and TPH, as gasoline, at 370, 180, 11,000, 0,6, 9,
<br /> of benzene, toluene,
<br /> and 28,000 ppb, respectively. Groundwater samples from MW-2 contained concentrations
<br /> of 5,8, 3.6, 130, and 320 ppb of benzene,
<br /> toluene, xylenes, and TPH, as gasoline,
<br /> respectively. Groundwater from MW-4 contained 0,9 ppb of xylenes (Table 3).
<br /> 3.7 Sotl Stackfle Anal fcal Results
<br /> -" On February 1, 1991, a soil sample was obtained from a soil stockpile in the rear of the
<br /> service station. The sample was tested for BTEX, ENo conDcent adtio sHabovethelidetec'table
<br /> crude oil, jet fuel, kerosene, and Stoddard solvent.
<br /> limits were found.
<br /> On June 26, 1991, four point samples were collected from the soil stockpile
<br /> sampling generated f
<br /> rom
<br /> July
<br /> was
<br /> the drilling of the sail borings for
<br /> W had a alyzeddthe samples from the June 26, 1991,
<br /> conducted because the laboratory at the
<br /> sampling event after the holding time
<br /> EDC EDB,expired.
<br /> and TPH
<br /> aslgasolinle,diesel,
<br /> Stoddard aolvent,
<br /> laboratory and analyzed f
<br /> kerosene, mineral spirits, and jet fuel. Benzene,
<br /> enrespectivelyxylenes.abie 6)gasoline were found in
<br /> concentrations of 0.007, 0.019, and 5.3 pp
<br /> SO•U9BC.FP� _ _ - .
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