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a •EkVIIONMENTAL HEALTH DIVISIO'� R'
<br /> 1-" -304 E. Weber Ave. Third Floor 1✓
<br /> P. O. Box 388, Stockton CA 95201-0388
<br /> Approved
<br /> Denied ❑
<br /> (V/Conditions Scae gGl,pf,J
<br /> Date CI.25'4j'1 by
<br /> CAMBRIA
<br /> P O Po56D S i 1/1 w August 14,1997
<br /> J ,/�� Suit
<br /> , e5 Mr.Ron Rowe
<br /> UG
<br /> � 1t WC+J San Joaquin County Public Health Services
<br /> Environmental Health Division
<br /> Q PPS r(LsJ I DELL304 East Weber Avenue,3'Floor
<br /> r` 1 It/u 1G 1 Stockton,CA 95201-0388
<br /> m P �� Re: Response to Additional Investigation Request
<br /> Shell Service Station C
<br /> 341 Main Street }(
<br /> Ripon,California
<br /> WIC#2046562-0804
<br /> Cambria#240-324-6
<br /> GVa:W``t'^'' Dear Mr.Rowe: I
<br /> f
<br /> t G 4 VZ In our July 17,1997 meeting,you requested that Cambria Environmental Technology,Inc.(Cambria)
<br /> 1('1�/ CJV► liC/ modify our July 11,1997 investigation work plan for the Shell site referenced above to include two
<br /> l additional wells.Your request was based on your concern that the methyl tert-butyl ether(MTBE)
<br /> /1011'' V 1L detected at the adjacent Chevron Station could be from the Shell site. According to the analytic data s
<br /> that you provided for the Chevron site on July 18, 1997,MTBE was detected once last year,at
<br /> I maximum concentrations of only 13 parts per billion(ppb). Because the MTBE concentrations detected
<br /> WAll,-,Q at the Chevron site are below the current MTBE regulatory standard of 35 ppb,it is premature to install
<br /> three wells at the Shell station. We instead recommend installing the single well as originally proposed
<br /> I h 1"5u A1-
<br /> in our July 11. 1997 work plan and analyzing the ground water sample. If MTBE is detected at
<br /> sufficient concentrations to warrant additional wells,then we will install the wells within four weeks
<br /> d el r r r of receiving the analytic results for the first well. This approach will ensure that we install the
<br /> additional wells if and only if hydrocarbons including MTBE are detected in the initial source area well.
<br /> rr , /� �,e t rnlp�riir� i
<br /> IIV Nrl Cambria will obtain county permits and schedule drilling upon receiving written work plan approval
<br /> from the SJCPHS. We will subunit our investigation report about six weeks after completing the field
<br /> VOL 4/1Y✓� Y�v'�rtvvtlf�7 work.
<br /> CAMBRIA
<br /> We appreciate the opportunity to work with you on this to' t. Please call if you have any questions
<br /> �ryV�✓� ,�v•K,_�y�/,' 1E,v,,oYm,, m or comments. ��ED G'�
<br /> W�NricOr,II Sincerely, ���SyGOSTMe��OC��� i
<br /> Cambria Envi ental Technology,Inc. g Q
<br /> L)17 VL,- „ d ,t,/► m R 1I44 6in+5raeEr, NO.5747 I
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<br /> OAKLAND, PnncpalGeolLeodtR:G. slq�OFCAtxF�P�\P
<br /> C.4 94603
<br /> cc: Mr.A.E.(Alex)Perez,Shell Oil Company,P.O.Box 4023.Concord,CA 94524-4023
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