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FagM- <br /> RESN^ Vv ATER VV ORK CORP. <br /> INDUSTRIES <br /> January 15, 1991 <br /> Mr. Harlan KnollI„+ii <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Fourth Quarter Groundwater <br /> Monitoring <br /> Report <br /> Knowles Property, 1140 <br /> Stockton, CA 95207 <br /> Dear Harlan: <br /> This letter report updates the activities at the former <br /> ure l)Knowles <br /> Gas Station during the last quarter of 1980 for Fidissolved <br /> Activities during the month have included sampling <br /> ' d monitoring of groundwater. <br /> petroleum hydrocarbons an <br /> lls. Field <br /> Groundwater samples were ind collectedom five <br /> MW 3.We Samples were <br /> personnel were unable t <br /> analyzed for benzene, ethylbenzene and xylenes methods <br /> and total p;r wells h MW6 and oMW7 low as drocarbnsglevels eof xylenes were the <br /> 8020/8015. <br /> MW2, low levels of toluene and <br /> only constituents detected. In of <br /> xylenes were detected No ledwith elefromvated wellconcentrations <br /> oMW5n during sthe Tlast <br /> Free product has been <br /> quarter. Approximately 35 gallons have been recovered. High <br /> levels of dissolved <br /> va d pbenzenetrojeumwasddetected in MW4 rocarbon constituents <br /> levels <br /> detected in M The <br /> slightly above State Maximum Contaminant Lev <br /> eldocumentation are <br /> laboratory j-,-,ports and chain-o-custody ; <br /> presented in Attachment I. <br /> monitoring data reveals a groundwater grawzi h <br /> Of <br /> Groundwater is <br /> direction <br /> 0.002 ft/ft in FiL <br /> southeast <br /> measured in Octo )ber of1989 (Table <br /> consistent withthegradient <br /> 2). <br /> erature were noted on <br /> During purging the pH, conductivity and temp <br /> the development/purge logs (Attachment 2.). <br /> 1710 MAIN STREET • ESCALON,CA 95320 • (209)838-3507 <br /> 2350-A WALSH AVENUE • SANTA CLARA,CA 95051 (408)496-1249 <br /> •'�- aonv�uwr.,. �.:imown�mnm��srw��'ieQd <br />