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<br /> _ � :Cone Penetrometer;Testing Site I --- ' trgation Fourth:Quarter 11 2001 ; �.
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<br /> CALIFORNIA'PUELS'CARIDLOCKSTA-ION " ' -� z
<br /> �- , :� , , Y . -� 2402 Pacific Avenue;Stockton; California '� m� ��� . -' - _ -� 1
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<br /> 1 U. INTRODU{CTION;AND S°COPE OF WORK � ,� i ,f � -
<br /> At the request of Mr I3avld_Atwater of-Van D1.e Pot Enterprises Inc ;`Advanced Up 'E'pwronmental, , ,
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<br /> Inc: (AGE) has='prepared #his report of findings for=�'2402�Pacific4Avenuel[(the site); Sfockton, �.
<br /> { California, There ort ilocumphts.: rocedures and res lts fol additional-site Investi ,tion b cane
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<br /> & penetrometer testing(CPT)conducted at=the site dunng'October 2001 (fourth quarter 2001)° The site j f
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<br /> settin is_illustrated on Fi e'1 Site structures and monitonri well locarioris are de acted on Fi 'e } - r
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<br /> . The objective.of-this-CPT investigation. was to characterize and assess. the vertical extent o - .,_
<br /> dissolveii.petroleum TYiydrocarbolis nand;tom characterize -the geological and ;hydro=geological f: r
<br /> _- . framework undeilyiiiig the site This report=has lieen.prepared in accordance w'itfi'guidelmes.issued E
<br /> by-the,California Regional WateryQuahty Control Board Central"riValley-Region (RWQCB) for : k t _
<br /> -t , :_ . — .— , . . '> —A summary,ofprevious'mvestigations at the •.
<br /> �4 . - site:was°included in_Remedial Action Work Plan RAWP dated 30=Deaerriber 1998, prepared by -�''°
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<br /> The fallowing is a chronology of the CPTRmvestigation a �- - , {
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<br /> _ • . = 29.October 2001 Advancement_of CPT soil bonng_(CPT l} to a depth af150_,feet below ° Y t- J
<br /> _t — k surface.grade;.collect grab water samplest Selected'depths- t � � _ ._�*
<br /> �J _ T :29,Octoher:2001 Advancement of CPT soil boring (CPT 2) to a-depth of 122=feet below `' _ }x
<br /> '. • �1 - surface,grade;.liorlrig`terminated due to CPT refusal s �i % �7 k
<br /> 4Lw .7 - _30 October 2001 Advancement of CPT'soil boring(CPT 2A) to a_ eptlrof 150_fMiMow -1u
<br /> surface-grade collect-grab water-samples:-at selected depths F r � _ 'L x_
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<br /> F` 2 0. CPT SOIL BORINGS � , `�" � s�.. }� �2
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<br /> iF h ' On 29.and 30 October-200-1 three soil borings(CPT 1;:CPT-2 and CPT 2A)wk re advanced oil-site ¢ F`r
<br /> Y ~ utilizing-CPT-technology to'charactenze the geologicaFdrid h�dro eoIo cat framework and to� - j p
<br /> ���_ :' identify,potential contaminant migration,pathways beneath file site -�= u T � �,
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<br /> I ,Soil boring CPT 2A was advanced.approximafe1y 10,feet east of CPT 2 aE the site due to drilling �_ __ ,. 3�.
<br /> ' ;refusal encoiiitered at soil'boiiii GPT 2" -` '� ��
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<br /> , Based on`CPT 'lithologi soundmgi data collected at CPT L..and CPT 2A, deptYdiscretey"grab `�"
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<br /> : L: �: -ground water-samri les,were_collected.b revisitin locations_of theArntial.CP� : soil boi-in s via an j ,
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<br /> -, - adjacent boring advanced within two feet i--the initial=boring Grab,-water samples collected from :l
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