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m moldenhauer <br /> L.ALEX MOLDENHAUER,L.S.,P.E. <br /> e engineering PRINCIPAL <br /> C companys <br /> 337.871 \`�' %'0��g �. <br /> June 12,1989 <br /> CFS <br /> Mr. John Tomko <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Dear Mr. Tomko <br /> This letter is to inform you of our progress with respect to the <br /> contamination problem on the property of Southwest Hide Company of Manteca. <br /> On June 2 we completed eight soil borings to an approximate depth of twelve <br /> feet below ground surface elevation. These borings were drilled in the <br /> immediate vicinity of the abandoned leach field and were all sampled at <br /> approximately two, seven and twelve feet below ground surface. <br /> On June 6 and 7 we completed one additional boring in the leach field <br /> area. This brings the total number of borings to 13 instead of 16 described <br /> in our last communication. Three of the soil borings have been deleted, <br /> because of their proximity to underground water and power lines. Please <br /> note these locations on the included diagram. <br /> Also on June 6 and 7 we completed soil borings in the area of the old <br /> salt storage facility and the wash rack. During this period, three <br /> monitoring wells to 30 feet were also completed. The fourth 30 foot <br /> monitoring well will be completed as soon as encroachment permits can <br /> be arranged for drilling on the private property of Southern Pacific Rail <br /> Road. <br /> Well 7B on the figure is scheduled to be drilled on June 19 to a depth <br /> of 140 feet. It will be screened from 130 to 140 feet with a 2 foot thick <br /> bentonite plug to seal it from the upper aquifer. <br /> All soil borings and monitoring wells will be sampled at five foot vertical <br /> intervals and taken to a state certified laboratory for eletrical <br /> conductivity and chloride analysis. <br /> The two old production wells on the property are scheduled for cleaning <br /> beginning Tuesday June 13. Because of the uncertainties involved however, <br /> a completion date can not be provided at this time. <br /> 1107 KENNEDY PLACE,SUITE 7,DAVIS,CA 95616•(916)756-2250 <br /> cur NFFRiMr. r n N R 11 1 TAN TC t P R n i ECT PLANNERS <br />