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CA <br /> X117 Lone. <br /> Avenue <br /> : _ -..Suite S . <br /> ' R W'desto, CA 95351 <br /> 209 579.2221 <br /> fax'209':579.2225. <br /> A .S S O C 1 A:.T. E S "`'1: N 0 ', <br /> July., 6; 999. <br /> ... <br /> .54.625'74:0005 <br /> Ms. Lori Duncan <br /> San.Joagiun County Public Health.services <br /> t Environmental Health Division <br /> 304 E:`,Weber.Street,Third`Floor <br /> Stockton,.C, orm :95202. <br /> Subject` : Monitoring Report'Second Quarter 19.99;;City of StocktonFre• tatiori#3;. 1115, <br /> t .. <br /> x.._First`Street;'.Stocl{ton, California: _ ={. <br /> Dear.Ms -Duncan: <br /> This'report presents the results of quarterly groundwater monitoring and`sampling performed.on <br /> June I f, 1999 by .ATc; Associates .Inc at ;the site located at` 1116` First.Street, Stockton, <br /> California. (Figure 1): Monitoring was performed to determine:the groundwater flow-direction.," , <br /> and,the hydraulic gradient.-in-the- uppermost.aquifer.' Samp1mg- ' as•'performed to'monitor the <br /> _ . ; <br /> distribution:of petroleum°hydrocarbons,iii groundwater at the srte: : _ <br /> _SITE HISTORY <br /> One.gasoline'UST of unknownRs'ze', and all-'As&iated{piping and dispensing:equipment were- <br /> removed and transported from.the site Laboratory analysis of soil-`samples collected from. <br /> beneath the former UST °location indicated the,presence':`of detectable concentrations of total <br /> petroleum hydrocarbons.Y After the tank'was removed the area of;tl3e former tank was backf fled: <br /> k Following-tank removal activities; four'`soil borings-(SP 1 :through SP'4) were advanced_in the <br /> .immediate vicinity of the•.former, UST:;' NAnalytical resultsandicated:.that:.----§6i1- .impacted with <br /> petroleum: hydrocarbons extended.to: approximatel 28 feef below round.,surface. s" , The <br /> y; g a (bg _ <br /> approximate 16caiions:ofthe former UST'afid'§6il onhas sfiown oh Figure 2:: <br /> On July 20; 1998, Advanced°`CieoEnvtronmentaf"..nc';1AGE) supervised the advaricemerit of one'. <br /> soil boring; MWl;through the•.:former UST excavation to. depth of 65 feet:bgs..'The boring was <br /> completed as a.two=inch diameter.montorang`well screened from;45 to 65 feefrbgs:,Analytical' <br /> results of so'il`samples`indicated.,the prese' Fpetic,-eum hydreearbon.s.at26_,feet•figs-but the <br /> impacted soil appeared to attenuate_rap idly with depth wThe,mo ntoring well was`developed and <br /> a groundwater sample was collected from the well although water was measured to be above the <br /> top of the-w ell screen,.. Analytical.results indicate' the presence:of petroleum hydrocarbons:' <br /> t Results are summarized m4AGE Quarterly Report. --,July 1998: . <br /> w:\62574\62574:05\quartly\Zgr-1999.doc 1 <br />