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January 17 , 1992 „ ! <br /> f <br /> Mary Meays, EHS �� <br /> Environmental Health Division ��p. <br /> Public Health ServicesV1 <br /> San Joaquin County <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Mr. Boggs <br /> CVRQCB <br /> State of California <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> RE: SITE CODE # 1828 } <br /> i <br /> FIRST QUARTERLY REPORT 1992 <br /> BACKGROUND TO DATE: <br /> On January 4, 1988 the underground storage ��tank located <br /> at 4648 E. Waterloo Road in Stockton was removed. This <br /> permitted tank of 550 gallons had recently passed a <br /> precision test and no visible leaks onfthe tank were I <br /> noted upon a routine removal . However;. laboratory <br /> testing results by Ramcon of Sacramento on ��3-28-88 <br /> indicated that soil contamination was present in the <br /> soil (benzene less than 500ppb, toluene 1060ppb, xylene <br /> 2000ppb, ethylbenzene less than 500 ppb, TPH 37 ppm, <br /> TPH--gas 40 ppm and total lead 74 ppm) . fi With the J <br /> permission of San Joaquin PHS/EHD and the San Joaquin <br /> County Air Pollution Control District the excavated <br /> contaminated soil was aerated on site unti]M 1-12-89 <br /> when -testing indicated that `no further ircont'aminatioi was - - <br /> present in the soil . <br /> On July 7 , 1988 further investigation of the site by <br /> Applied Geosytems of Sacramento resulted in two soil <br /> borings , B-1 & B-2. B-1 was drilled to 301feet and i <br /> field screening with an OVA did not indicate j <br /> contamination at that depth. A bottom4�samphle was taken <br /> at 30 feet, however the analytical detection limits were <br /> too high for BTXE to confirm that no contamination was <br /> present. B-2 was drilled to 75 feet and field screening k <br /> r. with an OVA indicated that contaminatipn ways present l <br /> beginning at 30 feet, highest at 45 fejt ari8 ending at <br /> 75 feet. Two samples collect in B-2 at 45 !Cfeet and 60 <br /> feet were analyzed. Contamination wasjinote'"d at 45 feet <br /> (TPH 3 . 4 ppm, ehtylbenzene 100 <br /> ppb, toluene 1000 ppb, <br /> and xylene 500 ppb) and at 60 feet (xylene !�900 ppb) . <br /> B-2 was converted into a monitoring weljl, MW--1, which in <br /> 'f <br />