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/ p <br /> Diane Han�zon <br /> San Joaquin Ccur:ty Health District <br /> Stockton, CA 95201 <br /> FE: Work plan concerning excavation of waste oil area. <br /> Dear- Di ane. <br /> As to our phone conversation today, the lab results of the soil <br /> sample we obtained from the 8 foot depth of the waste oil <br /> er.cavation shows the following results}sample #88-2309-5, the <br /> other two samples are background from the fuel tank excavation <br /> area (see mala). <br /> Sample ID Location PCB Organic Lead EDB <br /> (ppm) (ppm) (ppb) <br /> 88-2309-5 waste oil excavation 8' depth �0.1 0.05 't�1.0 <br /> 88-2309-6 41/tar-k —vation sarxth end 8' depth <0.1 <br /> 0.05 ! 1 .0 <br /> 88-2309-4 "I tank excavation SW toner 14depth 0.1 '-0.05 <br /> ? Sample ID Benzene Ethy Benzene Toluene. Xylene TPH ppm <br /> 88-2309-5 <'i .0 �1 .0 23 <1.0 32 motor ail <br /> 88-2309-6 X1.0 <7.0 1 .0 1 .0 Ei0 <br /> 83-2309-4 41.0 <1.0 < 1 .0 1 .0 `10 <br /> The waste oil tans; excavation has been backfilled with clean <br /> material . We plan to re-excavate this area down to the top of <br /> water tit foot and laterally excavate in PSS direction+ 8 foot and <br /> EW direction +6 foot Monday 6-5--88. The removed material . will <br /> then be stock piled at the SE corner of the lot, pending lab <br /> results from the soil samples that will be obtained, on Monday or <br /> during the first available inspection time (under observation of a <br /> San Joaquin County Health inspector). The soil will be disposed <br /> 27. <br /> to Tracy Land4ill if samples show the spoiled soil below action <br /> levels or for treatment or to hazardOUS waste depository if found <br /> above Or at ac_t_i on 1 eve; s. <br /> The site is sched4iled for cement farming ilanday and Tuesday (June <br /> 4-7, i7,2--q . Tf lab results indicate contamination is still <br /> present near waste oil e::cavatico sample borings and or more <br /> e:;c�cvat:i an and sampling wi l I he done to delineate the spread of <br /> the contamination for assessment prior to the next step. <br /> I T• waKt«- ciI ar-pa e):cavatirin will be backfilled with clean <br /> material prior to .any surfaize resl:oranon. <br /> Si nr_rer-l y' <br /> ^veorge L. Converse:. <br /> [ �_ President <br />