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ENVIRONMENTAL HEALTH DEPARTMENT <br /> °"'" SAN JOAQUIN COUNTY Unit S[!n¢1'VISOYS <br /> 40._��..C�G <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • �.., P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4 t i F o a�� Robert McClellon,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> APR 2 6 2002 <br /> CLIFF BAILEY <br /> CSU STANISLAUS <br /> 801 W MONTE VISTA <br /> TURLOCK CA 95382 <br /> RE: CSU Stanislaus SITE CODE: 700 <br /> 1252 Stanislaus <br /> Stockton CA 95204 <br /> San Joaquin County Environmental Health Division (EHD) has reviewed "Additional Soil <br /> and Groundwater Investigation and Monitor Well Installation Report" (the report) dated <br /> January 11, 2002, that was submitted by CONDOR regarding the above referenced site <br /> and has the following comments. <br /> A well survey that identified water supply wells located within 2,000 feet of the site was <br /> included in the report. The survey identified thirteen well records that pertain to the <br /> study area. The report indicates seven wells are located on the CSUS property, four of <br /> the seven wells have been abandoned. Of the other three wells open, one is used for <br /> air conditioning, one is for water and gas, and there was no information on the well <br /> located in the old Stockton State Hospital in the report. <br /> The report details investigative site work that took place on November 20-21, 2001, <br /> December 10-11, 2001, and December 18, 2001, when four CPT borings, seven direct <br /> push borings, and three groundwater monitoring wells were installed on site. As <br /> described in the report, subsequent sampling of the wells took place on December 18, <br /> 2001. <br /> Results of the investigation indicate that both soil and groundwater have been impacted <br /> by petroleum hydrocarbons, and that the vertical and lateral extent of the impacted <br /> groundwater has not been defined. The highest concentrations of soil contamination <br /> were encountered in the area of GP-6 and GP-8, where analytical results from boring <br /> GP-6 included .025 mg/kg benzene, .008mg/kg toluene, .005 mg/kg ethylbenzene and <br /> .021 mg/kg total xylenes and GP-8 had .005 mg/kg ethylbenzene, .009 mg/kg total <br /> xylenes, 1.0 mg/kg total petroleum hydrocarbons as gasoline (TPHg), and 3.1 mg/kg, <br /> total petroleum hydrocarbons as diesel (TPHd). PID measurements in the field <br /> indicated organic vapor concentrations of 6.0 to 754 ppm in GP6, 0 to 31 ppm in GP7, 0 <br /> to 372 ppm in GP8, and 0 to 14.4 ppm in GP9. Water samples were collected from <br /> SP1, SP2, SP3, and MW1 through MW3. <br />