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Wm. I Hunter & Associates 2220 Loma vista Dr. <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> R E C E 111"E D <br /> January 2B, .1993 FEB <br /> ;r <br /> Linda Turkatte, RENS ENVIRONMENTAL HEALTH <br /> San Joaquin Co. PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref: 2969 Loomis Road (Site Code 2015; ) Quarterly Report, <br /> monitoring well data j <br /> i <br /> Dear Ms. Turkatte; <br /> We have enclosed a- copy of the field -log, chain of custody form, <br /> and laboratory analysis of a water 'Isample taken from MW #1 on <br /> December 30, 1992. Water level measurements were taken in MW #2 <br /> & '#3, but water samples were'' not collected: The results of the <br /> laboratory anlysis reveals that all tested ' substances were below <br /> detection levels. <br /> We have also included an updated exhibit showing the direction of <br /> hydraulic gradients as indicated by the four water level measure- <br /> ments taken to date. That data indicates" the direction of flow <br /> has changed again from a southerly direction, (9/15/92, ) to due <br /> north, (12/20/92 data, ) The current gradient as measured places <br /> MW #1 downgradient from the site' of the removed UST's; the water <br /> samples taken during that measurement did not reveal any <br /> contamination. <br /> The reason for this frequent change in gradient is not known, but <br /> is fairly common in this area. It; appear,s; that the placement of <br /> one or more additional monitoring 'wells is not warranted at this <br /> time. We recommend that the quarterly monitoring be continued at <br /> least until sufficient data is available to indicate some consis- <br /> tency in the direction of. the hydraulic gradient. <br /> Yo�u�r js r u l <br /> Willi Hunter <br /> MR. Hunter & Associates <br /> incl . <br /> cc: John Marci <br /> . j <br /> i <br /> t ' <br />