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AGE STOCKTON <br /> 2e946'7 $ <br /> AdvancedInc'. <br /> Geoff <br /> vixonmex�ta� <br /> 25 Jute 2002 1 <br /> pAGE Project No. 95-0173 I <br /> VIA FACSUAME: (209) 468-3433 I <br /> Mr. Jeff Wong <br /> San Joaquin County Envirownental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stocicton,.CA.95202 <br /> SUBJECT: Sediment Accumulation in well MW-13 <br /> California Fuels Cardloek Station,2402 Paci#le Avenue,Stockton CA <br /> Deax Mr.Wong: <br /> On 20 June 2002, ground water monitoring and sampling was performed at the above referenced site by <br /> Advanced GeoEmviromnental,Ind.(AGE)-During monitoring,it was discovered that sediment had filled the <br /> bottom of well MW-13(screened 95 feet to 100 feet)to a depth of approXimately 75 feet below surface grade <br /> (bsg)-During previous ground water monitoring events,'well MW-13 purged"dry"after approximately 10 <br /> gallons of ground water pumping. However, during the June 2002 inonitoring event,ground water recharge <br /> was significantly greater than previously observed. <br /> AGE suspects that the integrity of well MW-13 has been Compromised by either casing:separation or the <br /> bottom well plug detaching from the well casing, thus allowing sediment to accumulate in the well. The <br /> incident cannot be further assessed until the sediment accumulation is removed. 'Therefore, AGE believes <br /> that a well-development rig is necessary to effectively remove the sediment accumulation between 75 and <br /> 100 feet bsg. Following well development,.AGE will evaluate the integrity of the well. <br /> We have tentatively scheduled well development activities with Cascade'Drilliug� Inc.to commence oil Z6 <br /> June 2002.If YOU have any questions or require further information,please contact our Office'at(209 467 <br /> 1006. ) <br /> Sipcerely, <br /> Advanced Geo]E+nvironmQptal, Inc, <br /> 416 <br /> Timothy Clar <br /> Project Geologist <br /> Enclosures <br /> cc: NIX. David Atwater-Van De Pol Enterprises, E <br /> Inc' <br /> l <br /> 'I 837 Shaw Road,Srockron,California 95215 <br /> Telephone(209)467-]006 FAX(2.09)467-1 I 18 <br />