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Wm. J. Hunter & Associates 2220 Loma Vista Dr. <br /> Registered Geologists Sacramento,CA 95825 <br /> troleum & Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> February 7 , 1995 <br /> Joel Weiss, Engineering Geologist <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routi.er Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Ref : 1145 W. Charter Way, Stockton. CA <br /> Dear Mr. Weiss, <br /> In response to correspondence from your office dated December 9, <br /> 1994, we are submitting a revised workplan (addendum, ) tO expand <br /> the scope of investigative work proposed in our 11/7/1994 <br /> workplan at the above property. <br /> We now propose placing four (4) monitoring wells and four (4) <br /> soil borings in an attempt to more fully define the extent of <br /> soil and groundwater contamination encountered on the property. <br /> The approximate locations of the wells and soil borings are shown <br /> on PLATT: Vl _ The locations of monitoring wells #1 & 2 should <br /> determine the westerly extent of possible soil contamination and <br /> provide water quality and gradient data. They should also detect <br /> if there are previously unidentified sources of groundwater con- <br /> tamimation to the west of the property. Monitoring well #3, in a <br /> downgradxent position, should not only give good gradient data, <br /> but also evaluate the possible easterly migration of pollutants <br /> beneath the shop building. Monitoring well #4 is located down-- <br /> gradient from the three diesel UST' s recently removed from the <br /> site, which revealed that contamination had reached the water <br /> table at that location. The results of that work is included in <br /> the workplan addendum <br /> Soa..l boring A, west of the maintenance shop & east of monitoring <br /> wells #1 & 2 should determine if soil contamination is present; <br /> it is planned to obtain a discrete water sample by use of a <br /> Hydropunch or BAT tool. <br /> Soil boring B as located in the approximate center of a removed <br /> waste oil tank; measureable amounts of xylene, diesel, & motor <br /> oil were found in a soil sample taken at 10' below the west end <br /> of the tank, refer to TABLES II . III . IV & V for a summary of <br /> those results A water sample will be obtained from this auger <br /> hole if 501-1 contamination indicates the possibility it has <br /> reached groundwater_ <br /> Soil borings C & D are located along the product line which <br /> .} connected the diesel tanks to the pump island adjacent to the <br /> shop building It is not planned to obtain water samples from <br /> 1 <br />