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Wm. J. Hunter & Associates <br /> Registered Geologists 2220 Loma Vista Dr <br /> 4petr0leum& Mineral Appraisers JUN 1995 Sacramento, CA 95825 <br /> (916) 972-7941 <br /> ENVIRONMENTAL HEALTH FAX (916) 972-1683 <br /> May 27, 1995 PERMIT/SERVICES <br /> Michael Infurna, Sr REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref SIXTH QUARTERLY GROUNDWATER MONITORING REPORT- <br /> 1500 Shaw Road, Stockton, CA, (Site Code 1.727) <br /> Dear Michael, <br /> We are enclosing the results of the sixth quarterly report <br /> covering groundwater monitoring activities at the above site, <br /> which were performed on March 29, 1995 . Copies of the field <br /> logs, water measurement data, chain of custody and laboratory <br /> reports are included The results of all of the laboratory <br /> results taken since monitoring began are summarized on TABLE I <br /> for your convenience. <br /> This is the seventh sampling and testing since completion of the <br /> four monitoring wells in May, 1993 , and the third sampling of the <br /> three new wells placed in August, 1994 Details of the newly <br /> completed wells were covered in the report titled "INTERIIM <br /> ASSESSMENT REPORT AND RESULTS OF GROUNDWATER INVESTIGATION" dated <br /> October 2, 1994 <br /> The following observations concerning the monitoring activities <br /> to date are offered for your information. <br /> 1 The water table table has risen an average of 1.5 . 75 ' since <br /> the December measurements, to an average depth of 53 16 ' bgl ; <br /> (-26 52 ' msl datum ) Although the water table in the Stockton <br /> area has risen several feet due to the extremely heavy rains this <br /> season, a 151 + rise was unexpected It is most likely due to the <br /> fact that the Stockton diverting canal is a short distance away, <br /> and there is considerable open land in the area allowing good <br /> recharge <br /> 2 . The hydraulic gradient as measured in the seven wells during <br /> the March sampling was to the south at about 0 . 6251 /100 ' , or <br /> approximately 33 ' /mile The direction has not changed signifi- <br /> cantly since the first readings in June, 1993 An April 18, 1995 <br /> report prepared by WJH discussed the results of water level <br /> measurement data taken on 3/29/1995 from the seven (7) Canteen <br /> 1 <br />