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z <br /> Mr. J. Kelly Williamson <br /> Kayo Oil Company <br /> April 8, 1985 <br /> Page 2 <br /> were surveyed and monitored to determine the ground water gradient. <br /> Approximately 1/8 inch of product had accumulated on the water table in <br /> MW-1 since it was drilled. in the original investigation. A slight <br /> petroleum odor was noted in the ground water in MW-6 and MW-7. <br /> The soil profiles were characterized by silty sand (SM) and sandy silt <br /> (ML), with interlayered sand (SP/SW) dlid sandy clay (CL). [Allstro.ng <br /> vp.etrol_eum_A�odor, raccompanied by, an wLE r-eadingj ofeg55igpercen was <br /> detected i.Mhe _soil at a de th0of*351feet�i�MW`7! The only other <br /> ,detected-. ��. r p.. . <br /> detections of hydrocarbons in the soils above the ground water 4ac-cur:red? <br /> at,ra-Fdepth_Yof;35ffeet#ini-MW-6-ran_drMWf.9IV egister ing 5 and 4 percent LEL, <br /> respectively. The soil sample collected in MW-7 at a depth of 35 feet <br /> was analyzed by IT Stoner Analytical Laboratory using the EPA 602 <br /> method. Laboratory results are shown in Table 1. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The ground water gradient is relatively flat, but does appear to be <br /> oriented in a southwesterly direction, as shown in Figure 2. <br /> Hydrocarbons have been detected at the Water table in MW-1, MW-6, and <br /> MW-7. The highest accumulation of hydrocarbons occurred in MW-1, with <br /> 1/8 inch of product on the water table. de recommend collecting a water <br /> sample for the domestic well on the Site and having it analyzed for <br /> hydrocarbons to determine if the drinking water has been contaminated. <br /> All the wells should be monitored and purged for fluid levels or vapors <br /> on a weeky basis for six months to further evaluate the size of the <br /> problem. 4LSamples-whavewb-eenwizol-il-ecte- wrandwarew& ingmaalyzedWtow <br /> determnemibaologacalmks t=imu_lationifordc pleteremovalwofres-idual>i <br /> qqLhydrocarbonsXbysbi_o-„oxidat-ion is a v,ia_b -emopt5-oi_for;cleanu�tItthi� <br /> 45W <br /> We trust the information contained herein meets your needs at this <br /> time. If you have any questions concern ng this work, please feel free <br /> to contact me at our Martinez, California office (415) 228-8400. <br /> Very truly yours, <br /> l <br /> Thomas 0. Shoff Robert M. Galbraith, R.G. 3881 <br /> Project Manager Manager, Geotechnical Services <br /> TDS:jc <br /> 0028 <br /> Attachments <br />