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Underground Storage Tank Removal Report and Work Plan for Additional Site Investtgatlen 4
<br /> Southland Store#14117,2725 Country Club Boulevard,Stockton,Caldomia September 29� 1998
<br /> 42 Soil and Groundwater Sample Collection/Results
<br /> On July 22, 1998, two 4-point composite sell samples(SC-1-A, B, C, D and SCA-E, F, G, H) were
<br /> collected by Flour Daniel GTI personnel from the estimated 280 cubic yards of soil used to backfill the
<br /> old tank ptt The soil samples were collected directly from the backhoe bucket during the transferring
<br /> ' of the soil in 2-inch diameter by 6-inch long brass sleeves The eight sample tubes were seated with
<br /> teflon pads, plastic caps and tape, labeled, placed on Ice in an Insulated container, and submitted for
<br /> analyses under chain--of-custody manifest to WEST Labs in Davis, CA The two composite samples
<br /> were analyzed by WEST Labs for BTEX. MTBE,TPH-G, and TPH-D by EPA methods 8015/8020,
<br /> Volatile Organic Compounds (VOCs) by EPA method 8260, and PCB's by EPA method 8082
<br /> Laboratory analytical results of the soil samples collected July 22, 1998 are summarized in Table 1,
<br /> and copies of the analytical data are included in Appendtx C Benzene, MTBE,TPH-D, PCBs, and
<br /> VOC analytes were not detected in the samples collected TPH-G was detected at 19 mg/kg in sample
<br /> SC-1-A, B, C, D, and 38 mgflcg in sample SC-1-E, F, G, H
<br /> On July 27, 1998, during the continued excavation of the new tank pit, a grab sample (TP-13)was
<br /> collected from the groundwater which had accumulated in the tank excavation to a depth of
<br /> approximately 10 feet BGS The groundwater sample was collected following the same groundwater
<br /> sampling protocol mentioned in the previous section and analyzed by WEST Labs for BTEX,MTBE,
<br /> TPH-G, and total petroleum hydrocarbons-as-diesel by EPA methods 801518020,the oxygenates TBA,
<br /> MTBE, DIPE, ETRE, TAME by EPA method 8260, and total lead by EPA method 6010 The
<br /> ' groundwater sample was collected at the direction and under the observation of Mr Michael Kith of the
<br /> SJCPHS
<br /> Laboratory analytical results of the groundwater sample collected on July 27, 1998 are summarized in
<br /> Table 1, and copies of the analytical data are included in Appendix C Benzene and TPH-G were
<br /> detected at concentrations of 300 pg/L and 3,100 pg/L, respectively MTBE was detected at a
<br /> concentration of 27 mgfkg by EPA method 8260
<br /> On July 30, 1998,following excavation of the new tank pit, one soil sample (NTP-SW-15')was
<br /> collected from the southwestern portion of tank excavation The sample was collected directly from the
<br /> excavator bucket in a 2-inch diameter by 6-4nch long brass sleeve following the same soil sampling
<br /> protocol mentioned above and analyzed by WEST Labs for BTEX, MTBE, TPH-G, and TPH-D by EPA
<br /> methods 801518020,the oxygenates TBA, MTBE, DIPE, ETRE, and TAME, including methanol and
<br /> ethanol by EPA method 8260 The soil sample was collected at the direction and observation of Mr
<br /> Michael Infurrta of the SJCPHS
<br /> Laboratory analytical results of the soil sample collected on July 30, 1998 are summarized in Table 1,
<br /> and copies of the analytical data are included in Appendix C Benzene and TPH-G were detected in
<br /> 1 d 117ust rpt
<br /> FLUOR DANIEL GT!
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