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r a _ <br /> 1117 Lone Palm Avenue, <br /> Suite B <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> r F` =, Fax 209.579.2225 <br /> 5 A S S O C I�A.T E S I N C.. ... <br /> -52 <br /> October 5,1999 . . <br /> 54.62574.0005 <br /> 1 <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304"E. Weber Street,Third Floor <br /> Stockton,..California 95202 <br /> Subject: Monitoring Report Third Quarter 1999, City-of Stockton Fire Station No. 3, 1116 . <br /> First Street;Stockton,..California <br /> Dear Ms. Duncan:; <br /> This report presents"the,results of'quarte'I groundwater monitoring and sampling performed on <br /> September 3, 1.999.by ATC,Associates Inc. a# the' site located 4t 1116 First Street, Stockton., <br /> California i ure.1 . Monitorin was Performed to,determine the. roundwater"flow direction <br /> � g ) . .g .. p $. <br /> and the.hydraulic gradient in the uppermost aquifer: Sampling.was'performed to monitor"the <br /> distribution.:of petroleum hydrocarbons in:Rroundwater at the site: <br /> SITE HISTORY <br /> One asoline under round`Stora a ank' ST' of unkl own size :and all`associated i in and <br /> g g g ). p p g <br /> dispensing.equipment were removed and transported from the site.. :Laboratoiy analysis of soil <br /> samples collected from beneath the former UST �location.'Indicated-the presence of detectable <br /> concentrations'of total:petroleum hydrocarbons Aftef-the"tank was_removed; the area of the <br /> former tank was-backfilled,:: Following.tank.-removal activities, four soil"borings (SP .1 through <br /> SP-4);were advanced in theF immediate'vicinity.of the former UST: Artalytical•results indicated . <br /> that soil impacted:with petroleurii hydrocarbons extended`to approximately 28':feet below ground <br /> surface.(bgs). ' ,The'approximate locations of the former UST and'.soil.borings are shown on <br /> Figure 2..:-.. <br /> On July 20, 1998, Advaticedv.Geo'Environmental Inc:.(AGE) supervised the advancement of one <br /> k soil boring; MW1,through the.formet.UST�excavation to a depth of 65 feet bgs.`The boring was <br /> completed.as-a two-inch diameter monitoring.well screened from 45 to 65 feet bgs. Analytical. <br /> results of soil samples indicated:the presence,of petrgleum hydrocarbons at 20 feet bgs but the <br /> bv, v . LTC <br /> impacted.soil appeared to attenuate rapidly with depth. The..monitoring well.was developed and <br /> ' a groundwater sample waR -61lected from the well.although water was.measured to be above the <br /> w:\62574\62574..05\quartly\3gr-199VA66 1 <br />