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- •: mar-me- - <br /> T x <br /> - <br /> TR <br /> 'CONDOR EARTH.TECHNOLOGIES.INC.' <br /> - - <br /> -- 188 Frank West Circle <br /> MAR 0` 52002 = _ suite I <br /> February 13,2002 <br /> [_,_ Stockton; CA,95206 <br /> ENVIRONMENT H°EALTM �- (209) 234-0518 <br /> PERMIT/�E�ViCES- _ . - _ 34 -- <br /> r FAX 209 2 -0538 <br /> Jeffrey C. K: Wong = to <br /> .San Joaquin County Public Health Services <br /> Environmental Health Division,.-' <br /> 304 E. Weber Avenue-Third Floor ` R l <br /> Stockton, California 95202 <br /> - dot r <br />` Re: x2 Groundwater MoundingStud Report v `�— - _ - <br /> PR <br /> Canepa's CaraasT6 30 Pacific Avenue, Stockton,CA <br /> 13. <br /> Site Code: 1225 Condor Project No:1707.. <br /> T &.' <br /> Dear Mr. Wong: <br /> This report, prepared.by Condor Earth Technologies, Inc. (Condor.) at.fhe.request of Mr.�Renio Canepa,= <br /> describes a groundwater mounding study-at C_anepa's Car Wash .facility located at 623x0 Pacific Avcnue, <br /> Stockton, California:Mr. Jeffrey Wong of the San Joaquin County Piihiie'Healt-h`Services/Environmenta]- <br /> Health"Division(PHS/EHD)requested this study in,correspondence dateMay.,18, 2001. <br /> q 7 <br /> F. Site Background qi <br /> Canepa's Car Wash consists of an automated'.Car washing facility;a fuel.station, and al;�convenience store. <br /> , Y <br /> The car wash and.fuel station have been in operation for approximately 20'years. In the sprin'g of 1993, - <br /> three underground fuel tanks,fuel lines, and dispensers were removed and replaced with a double-walled <br /> system. The tanks consisted of two,12,000-gallon gasoline tanks and one.5,000-gallondiesel tank.When <br /> the tanks were removed; it-was discovered that the fuel'-lines,had'_leaked and that the`tankshad been <br /> --_ overfilled. Approximately'600-cubic yards of soil were-rem eved-from the fuel tank excavation area. µ <br /> Beginning in March 1993,-one soil boring and a network of nine soil vapor extraction (SVE) Wells were <br /> installed in the area of the fuel.dispenser islands. Between'September 1993 and March19�94;:eight _ <br /> monitoring well s_(MW'1'through MW-8) were installed.-Five-of the'monitor wells (MW,�_l_th-rough MW- _ <br /> 5) were constructed with.a;screened interval from.-approximately 50 to 70-feet below ground surface <br /> (bgs)..The remaining monitor wells were constructed with a screen interval from approximately 45 to 65 <br /> := feet bgs. The depth to.groundwater measured at the-site on October 22, 1998 was.between approximately <br /> .35 and 37 feet bgs. <br /> - Since installation-of the wells- the groundwater elevations have gradually increased, with a total increase <br /> -'of about 20_;;feet since..1993.�-The site has also:exhibited mounding in_the-area of highest-contaminant r <br /> concentrations."The total mounding appeared to be less tha�f 1;fort across the site;.but`the total'`height of - l <br /> the mound was-unknown - _ 1 <br /> s _ <br /> ENVIRONMENTAL -_GEOLOGICAL ENGINEERING 'GEOTECHNIGAL <br /> http://www condorearth cam _ _ <br />