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-. � = <br /> Field Report <br /> Well Installation <br /> East Say Municipal Utility District <br /> Stockton Center, Stockton, California <br /> ` <br /> On February19,20, 21, and 25, 1991, Roy F.Weston, Inc. (WESTON)conducted a site <br /> investigation at the East Bay Municipal Utility District (EBMUD) Stockton Center facility <br /> in Stockton, California. This investigation was performed to gain further Information on <br /> the extent of petroleum hydrocarbon compounds <br /> Work Pian dated February 15,oil and groundwater at the t19g111 <br /> work was completed as detailed in the W <br /> A to#al of four s wboringsrwere <br /> ured toed on the the nearestte and foot with used <br /> to install <br /> permanmonitoring <br /> ent on-site <br /> All well locations <br /> structures. <br /> The four soil borings were designated MWS, MW-5, MW-6 and MW 7. Borings MWS, <br /> MW-5 and MW-6 were drilled to a total depth of 22.5 feet below ground surface (BGS) <br /> and boring MW-7 was drilled to a depth of 26 feet BGS using hollow stem auger <br /> techniques. This boring was drilled first and drilled deeper than the other borings in order <br /> to gain additional geologic information. Soil samples <br /> 1e were These soiilected samplesrwe a collected <br /> analysis from <br /> each boring at ten feet below ground surface (BGS). For <br /> from a one foot depth interval which extended below the stated sample dep�ximate <br /> example, a sample labeled as ten feet BGS was actually collected from the app <br /> feet BGS. returned to the <br /> interval between 10 and 11 dSto�lsurface cuttings <br /> describe the types of sedimentspresent <br /> unused soil in the split spoons was use <br /> Lithologic logs for the soil borings are presented at the end of this report. <br /> A stainless steel split spoon sampler fitted with brass sample tubes was used to collect <br /> the soil samples from the four borings.mSlel for�collect d waskremoved tfrom the split <br /> most <br /> tube within the sampler. Each sol p <br /> spoon and sealed with teflon lined plastic end caps. The end caps were then secured <br /> with stretchable plastic tape. Each sample was labeled with the boring number and <br /> sample depth. For example, a sample collected from soil boring MW-5 at ten feet was <br /> designated 5-10. All samples were labeled with stick-on labels filled out in indelible ink, <br /> with the following information: <br /> Site name <br /> Date collected <br /> Time collected <br /> Sample I.D. <br /> Sampler's initials <br /> Analysis required <br /> A - 1 <br />