|
. 4 1.�': -�s(': • h r -;-s. '2 �< 3_y �� `�' r :�. r• � p � r r-\ � .� _. ' �,f
<br /> Brown and{Caldwell ,r ).y `, } i �rx
<br /> Consultants `
<br /> 3480 Buskirk Avenue.'
<br /> Pleasant Hill CA 94523-4342 r F r
<br /> 4 ,P.Q.Box-8045 V !/
<br /> r Walnut Creek,CA 94596-
<br /> 11220
<br /> f
<br /> 9010
<br /> (510)-937
<br /> FAX(510)
<br /> September., 30 1993
<br /> l. K 's T ✓ y Y''4 a r ,-°'. c ,.: -}t.- ' G r - C 7y' f R c,
<br /> r t F ...r$
<br /> ` � � 's' rrl� - S. s '� ".' c d1 �, ' <c - �� �r'•,'?c f 1
<br /> k.., IM
<br /> Mr.-Michael.Collins
<br /> Registered Environmental Health'Specialist i
<br /> San.Joaquin County Public Health Specialist'
<br /> 'EnVirontnental Health.Division F 31µ a s
<br /> 445 N. San,Joaquin:Street
<br /> ` -011209Stock '95201, T7-703, C
<br /> Subject: Ft ill Kent's-Oil Rexk* i tion-Woject
<br /> Preliminary Results of StockpUe Samples
<br /> 4 ♦ 1 r'r r " x e I E a'
<br /> ' Dear Collinsc i f rt .;� � ,
<br /> yr y r Ar }
<br /> 4P,
<br /> i '' ".- . -7 r r ' 4�y "- X r:. i w-.;,1. r };.P -.. }` ,r•. �� "a y - Mf tp�
<br /> =Pursuant to the San.7oaquin County's (County) 'request for cfiaracterization sampling of theA ,r ,. ;;►
<br /> a Al '" excavated soil?stockpiled'at the subject facility,'�Brown and Caldwell {BC):was authorized
<br /> h , bylShel on Oil'Company {Sheldon) to coilect'32 soil`samples from the'stockpiles. Samples' '
<br /> ' were'collected undei jour-supervision; .at random,locations:approved by you-; and were
<br /> submitted-torWestern Environinerital'Science acid Technolo Laborato in,Davis;. F
<br /> gy_ .(WEST) ry-Y
<br /> 4 California: The-32 soil sampies'were composited by-West Labo atory,-into lb`samples and: '
<br /> analyzed-.for. total''petroleum hydrocarbons as diesel, iO$4), and motor oil-.(TPHmo)
<br /> ' _ ,, 1.,
<br /> r following'the'toxicity characteristic.leacfiing.procedure(TCLP) .listed Iin-Test lyfethods_fog r; �' - '
<br /> °� Ev' ri 1i W Ph y i. 1 'he mical M M5. November- 1- W- 84 i
<br /> `Edition ' "In addition' five of the composited.-soil 'saniples<-were, ,analyzed forTPP Hd,and , r ;
<br /> TPHmo following EPA Method 8015 Analytical laboratory data sheets are`presented.in
<br /> Attachment A;,Wid Summarized in Table 1'1=:� In]bnef;-TPHd.and.TPHmo".were identified in
<br /> g `
<br /> the,five soil samples at concentrations ranging from ,1801riulligrams perkilogrami(mg/Kg). k 1
<br /> f to .2100:mg/Kg TPHd arid,480 mg/Kg to '3600 mglKg TPHrno TPHdr land TPHsno were P
<br /> "it'*
<br /> r not identified at or above the'analytical method'reporting limii the 16:samples analyzed � � r* p
<br /> d following the TCLP Method . w .
<br /> y w a NU.
<br /> L , n The `County previously,recommended .that one sample for every 20U' cubic'yaazds of '
<br /> stockpiled :material;be,collected;-coinposited`:by the laboratory,.at a.ratio of 24
<br /> a.l, and r'
<br /> analyzed following the methods described above..-The 32 samples collected to irate represent
<br /> °oni sample for every:325 euaic:yards Based on ttie above 'results, BC believes that the
<br /> stockpiled,material has'been.sufficiently,characterized and that additional sarripling s f
<br /> ; "needed `.In'addition; based on these:results, Sheldon requests the County's approval to use t r
<br /> the stoc piled soil-.as:backfill
<br /> '•J [
<br /> moo
<br /> 4a ,.;`1 -;r ' ,-m _..fa '° :°k` c a.1�tx t:4' J a M8'{ I y 'S ' +h _ •.
<br /> J'
<br /> --t }"4, �,� , -� �h � ��� F 4�� �s_L��s x� r.r.f'f i� t` •�t1 _ �i}r i=�t=� , �, � �. - y,�� ,'
<br /> ri' -tl. -r` 1. r 'a.�' 4-. t'1 - 't ..:�i4 x1., s• �. '�'s±
<br /> � � .yl 'r Y�E'; '� �::w��' � S ��€?- •*�. _-1 ' �w:.�*1} � 4 ,,r4' �. 'i,-'t ■ � � f �-.y � -,."?� �,'., t 1` _ ..
<br /> y .e � t � w�d 6k� k � - y � -4, .1 t.'°L• 7u`^' .�'1 F >1 Y 1„- lSf f --C ',1, r✓ Y f�, 1 _ - -,}
<br /> .�. ✓.:.kT--.t ..-�:.....atA�l _1'K.'Q, :s+° .. Y - '` _ ,. v-.i _ (% , -? \. —..— ..�..�'1.=..-_�4 •.1 .- r• l ` — -- "":'"`'
<br />
|