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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN' JOAQUIN COUNTY <br /> + •< lt� Manna K,Horan,R1 11ti, �liiit�Sreperrrinrt <br /> W DwLelu7 304 East Weiser Avenue,Third Floot Coil lioreinan,It F II S <br /> Al Olson,R.F H S Stockton, Grtlifornia 95202-2708 Mike thiggins,It rt 118,R u 1 <br /> e .q Frograin Uaatige r Douglas W Wilson,R i I I S <br /> ►+F�w� Telephone, (209) 468-3420 Mar a�t-tl„i on <br /> - I,aurlc A Catnllp,l�lti Ii S 8 � o,R T;ii S <br /> Aagrain Managier Fax: (209) 464-0138 lUibL4 McClellon,R L• It 4 <br /> Maik Parcxlloa,It L+it S <br /> ' DAN DECKICR <br /> CONTIGROUP COMPANIES INC -MAY I <br /> 277 PARK AVENUE 50th FLOOR <br /> ' NEW YORK NY 10172 <br /> 1 ROBERT MENTELOS <br /> PENNY NEWMAN GRAIN <br /> 1805 HARBOR ST <br /> ' STOCKTON CA 95203 <br /> RE CONTINl?N CAL GRATN CO Site Code 1132 <br /> 18051IARBOR ST <br /> S'1'[7GK1'ON CA 95203 <br /> San Joaquin County Brivirortrnental fiefilth DepartinLnt( -,HD)has reviewed C-onrcirw Attiov Plan <br /> Ad4ii mm((-AP-l1) elated Mnrc.h 2005 prepared by I Iuff& Huff,Inc. (N&If) Ae CAP-A lstoposed <br /> ' three owr-excavarion altclnat1VLs <br /> A 1 1',XLavat1011 to 14 to 17 flet into groundwater table and laterally to monitunng well MW 1, <br /> ' removing npproxa-iarely 850 cubic yards nflmpaClLd soil sand 506 yards ovc iburdeil, this <br /> alret'1tatiwe will tttltrtLc shoring and clewatLnng Cost Lsrimate- $251 'Thousand (K) to 298K <br /> A2. I'xcavauon to 5 fcet below groundwater table and laterally to MW-3, removing <br /> approximately 1627 curie yaxds of im(mcu d soil And 672 yardi overburden, this alteriiattvL <br /> will riot rLLluixr shorinl;, blit[nay iegiitrC dCwatering $150 K to 183I{ <br /> A3 Excavation to 14 to 17 Feet below groundwater rabic-and literally to MW-3,runovtng <br /> approximately 961 cubic yards of impacted soil aid 672 yards overburden, this altern.tttve <br /> ' will rcc{curu both shonng niid dcwxrertng Cost estimate $276K to 322K <br /> 1I&II MC0111111enLILd A2 As the most cost-eFfectivc alrcinarsve to remove the source of fiee pruduct <br /> I'.I ID Licics riot tigLcc Wali II&1"l's .iltLrnative of A2 The highest cot>.ceritratton of Total P0TOILu111 <br /> 1 Iydrocarboris as diesel(TPI I ri) lei a monitoring well MW2 soil somple, 14,000 inhale iaii1S ptr <br /> kilLiel.tatns (n)g/kj,),was takL11 at 20 fcLt below surface gradL (bsg) 1)epth to groundwamr of NRV2 <br /> ftow 1998 to 2002 was between 8 feet b-ig to 12 feet bsg EXLavattng to 5 feet below watet isiblc will <br /> nol addicAR the host tittpacted sell Mar the source of contamination in tlae soil at 20 <br /> fret bsg wltc re , <br /> the diesel roncLsitration is the higIlLst A2 is the least costly but is not the most effective altcrnmve, <br /> ' In a coiisultsitinii by plione wttli Cenrral Valley 06fornia Regional Water Quality Control I30atL1 <br /> (C;VRWQ(;11) on May 3,2005,IIW(,)CB agreed with EI ID that Al is the more appropriate anti <br /> cffcLttvc �Ircri�itivc '111( TPI I-d Lonceurratxon of the MW2 soil sarnplc lit 25 fcct bsg was 1,500 <br /> ' nil,;/kg The TP11-d ConcLnrrations in boring]foil Samples (61 was located about 10 feet <br /> notthweet oFMW-2)were 6,800 int,,/kg at 20 feet bsg,and 3 trig/kb►at 25 Feet bsg; 'faze ll)Il d <br /> 1 <br />