Laserfiche WebLink
January 3, 1991 <br /> Sampling of Ground-Water Monitoring Wells AGS 86102-$ <br /> Beacon Station NO. 4`}2. N'Ianteca, California -- <br /> I <br /> We co1'ected gro rnd-water samples from ective evidence fach moniLoring ehydrearb nll and �s.e subjectiveNo' <br />� <br /> for floating product, sheen, and <br /> other . The <br /> evidence of hydr.:arbons wasobserved in <br /> les froy of lle m a ch tmonito monitoring Weil forllaboratory <br /> geologist then collected groan roved fir this use <br /> analysis. Water purge from the wells was placed in 55-gallon drums app <br /> by the s. arta ant of Transpartatian and stored temporarily at the site pending removal by <br /> Ultramar. olive <br /> The groundwater samples wc, analyzed for total petroleum by <br /> drocarbons as gas <br /> Agency (EPA) kilethods 5030 and 602, total <br /> (TPHg) using E,�viranmental el (TPtian si Y <br /> I EPA Leakin <br /> ified <br /> petroleum hydrocarbons as diesel {TP`eters`Resources etControl hod OBS and <br /> d methods <br /> spec <br /> in the LUFT Manual (Cali[ornii <br /> [Jnderg.•ound Fuel Tank L 1~ield i`_tacual: Guidelines for Site Assessment.Cleatotal <br /> nup. .� <br /> and Underground Storage Tank Cl,)se hods n030 ar d b0toluene, <br /> clT1 eesample were an <br /> Y e Not <br /> xylem: isomers (B'DEX) using EPA M <br /> E Itlobile Chem Labs Inc. in Turlock, California (Hazardous Waste Testing Laboratory <br /> 1223). 'Ile results of these a:A previous analyses are summarized in Table 3. <br /> ow <br /> C <br /> oncentrations of TPHg in the samples from wet <br /> ls MW <br /> -of and 74 a1rts per b 11 oW-3 were en (PPb)PTPHg <br /> limits for the analytical methods used. A cuncentratra P <br /> ed in the samples from <br /> was detectee in the sample from dslwere detected din he was not <br /> ampi samples from wells MW-I d <br /> the three wells. BTEX c3mpeun b but were not detected in .he sample <br /> MW-2 at conrcntratiori: ranging from 0.6 to 6.5 PP <br /> from well MW-3. Concentrations of dissolved <br /> own progressive increases benzene and other yover the last three <br /> samples from wells MV4 1 and MW product at <br /> sampling events. According rconcentrations may be duehere have been no nto an offsite ounce• <br /> the site; the increased hydrocarbon <br /> I <br /> i <br /> d <br /> 4 <br /> ! 2 <br /> L '4ppllear aeosystems <br /> �Q .. <br />