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<br /> _f'relitninary Investigation and Evaluation Report.[
<br /> 4k,:.CSUS Multi C',114
<br /> Regional Center "
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<br /> - _ Page 3
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<br /> jdriven three feet, the..conical tip_was:withdrawil-and.tlie core barrel:was.driven'an-additional 2 feet,_-
<br /> ,;resulting in a 2-foot sample at-five-foot intervals:The,satii le liner,was extracted fioinahe core barrel and. =.
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<br /> used for geologic logging_iuid field-observations. All soiI-sampies were logged according to the Unified -
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<br /> `Soil Classification System Geologic logs were prepared containiria field observations including soi-i type,
<br /> .,estimated moisture content;photoionization detector'-(PID)-measurements, and the presence_of staining or
<br /> odor.:The geologic logs are included,in Appendix B.--- - -
<br /> Each,soiI sample=was cut from the Finerat the selected-depth for potential-laboratory analysesThe soil
<br /> 1samples were-retained, undisturbed, -in the liners.-The liners were sealed at-the ends 'with. Teflon®
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<br /> ' sheeting, capped wrapped witlizdtict tape, and labeled.:Th`e`sai�iples were stored in.a_cooler chilled with
<br /> ;Blue lce1 ,and-delivered under,,cliairi-of custody_procedures to=Exeelchean;Env iroiimental Laboratories;_
<br /> 'Inc."of'Ro.seville, California�The sajples"were analyzed; using U:S:—EPA ihods.,andCalifornia
<br /> .approved-methods . - 5.
<br /> 3.2.2 Groundwater.Sainpl><ng �
<br /> One groi>ndwater-grab sample- was.-66 llected from each boring:�Teinporary well screens of '/4-in-ch T .
<br /> diameter, PVC'slofted casing-were installcd.dowri�to the bottom of each boring A groundwater sampleIF
<br /> W as retrieved2.from within the temporary`well. screen with-a =length of clean,, 3/8-inch diameter:,- .
<br /> polyethylene tubing with acheck=valve"at the bottom -The tubing was putnpetf itp and down by_f�andao 4
<br /> draw`gioundwater up the tubing; The groundwater u ample was dischargeddii-ectly from the tubing-into
<br /> laboratory-supplied :sample containers�_AII groundwater sample corttamers were sealed,=labeled; and
<br />+[ _ placed in a cooler chilled wi#h Blue lee® and delivered under chain-of-custody procedures to Excelchem -.-
<br /> Environmental Laboratories, lnc-. of Roseville, -California..The sarriples were analyzed_using U.S- EPA_
<br /> - s Methods and California-approved methods._
<br /> 3.3 :LABORATORY ANALYSES. -
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<br /> 'The snit and groundwater-samples collected from all the borings_were analyzed for Methyl tertiary,Butyl
<br /> Ether(MTBE).and benzene;toluene;ethyl benzene; and total xylenes (BTEX}by EPA-Method 8020 and
<br /> for total extractable-petroleum hydrocarbons (TEPH) girantified �as�ker ene' , diesel and motor ,oil and
<br /> total petr-oleurn hydrocarbons quantified as gasoline (TP,H G)T' EPA Method 8015m. In addition, the' - '�
<br /> groundwater'-sam'ple.=col lected-from boring: GP-3,. installed of-the approximate center of the former -
<br /> -.-... location of TK€0,-was analyzed-forgasoline oxygei�atesladditi.ves by EPA=Method 8260 and fol totaldead
<br /> by EPA.Method 6010.-The,gasoliile oxygenates/additive's include=MTBE, Ethanol `tertiary-Butanol, Di
<br /> isopropyl ether (.DIFF);` Ethyl-tertiary-Butyl Ether '(ETBE),' tertiary-amyl';-Methyl Ether.(TAME), 1,2
<br /> Dtchloroethane (l 2-6CA),and:1,2-Dibromgethane(ethylene dibromide--EDB) - -
<br /> 4.0 INVESTIGATION RESULTS' _
<br /> -The results of-the soil and'-grouudwater investigation include field observations (PIDsamplescreening
<br /> - results, detection_of sample odors,`and visual_observations'of-site-geology) and y oil.and-groundwater- _ x-77
<br /> - >sample laboratory analytical results. E a'boratory analytical.reports and-char-of custody recordsfor the '.
<br /> samples are included-in Appendix C.
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<br /> 4.1 FIELD OBSERVATIONS .- n.
<br /> Field observations included_P1D�screen1ng-results, detection of sample.odors;""Tand visual observations of;
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<br /> the site geology. Field obseiwations;are included on th'Eii geologic logs-prepared=for-ail of-the--borings=_ .
<br /> -(Appendix .B). Geoprobe0
<br /> _b_'i GP-1 was advanced to approximately 42�feet bgs Ms Dat Lofstroni'of
<br /> the San Joaquin-County was on-site to observe the advancement of GP=1 The walk;plan _
<br /> Anticipated the:borings would.be advanced toepth.a total dof-approximately 30 feetbgs or reftsai.=A
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<br /> CONDOR---r .. Y
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