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'�1. •_'.$ ,•,�M��"`a�����1rx =+ �a- �'�' ;,;. � A�.,wc''i'. "��. -�j. ��. `* � ti-r>q. M xsw z.ry N <br /> ti"«^ -rd_i ��rr ',��,Y' �� a*'yy�" kw,,..- �".�,#� � ����-.r _«a ?'�,+.fs. � n.;",i� ^ yr wy ��- • �'`4 M'4. 'it. Vii;�� <br /> a .a,. �.., a.-^x�.?. '� s �. .<k: M [:.� ry '•r -.� ��„..rsaawl al.• .;^^z �H,r�.., - <br /> L <br /> Ms.Diane Hinson, R.E.H.S. <br /> March 1, 1991 <br /> Page 2 <br /> Grnund 1'Vs;ter Anal•tirnE Results <br /> Each ground water sample was submitted for analysis of benzene,tolue-te,ethylbenzene,x;jenes,and <br /> total petroleum hydrocarbons (TPH) as ga.:oline using U.S. Environmental Protection Agency and <br /> California Department of Health Services approved methods.The analytical laboratory results of ground <br /> water sainples collected on January 31, 1991 are summarized in 'fable 2. Previous results are also <br /> provided in'fable 2 for comparison. Copies of the certified laboratory reports for January 1991 are <br /> included in Enclosure B. <br /> Analytical labora;•ary results indicate an increase in the concentration of petroleum constituents from <br /> October 1994 to January 1991. The concentrations in monitoring wells MW-1 and MW-5 increased <br /> significantly more than other wells. 'these wells are located downgradient and therefore, the <br /> concentration of dissolved petroleum constituents is expected to increase more in these wells as dissolved <br /> constituents migrate with the ground water. <br /> Free-Phase Product Recove <br /> A Westinghouse pneumatically-operated product-only pump was operated in monitoring well NIW-7 <br /> during the period. Product level in the welt has dropped from 1.05 feet to 0.10 feet, This pump will <br /> remain in monitoring well MW-7 during the next period, <br /> Delta will collect ground water samples the Iast week of April 1991 and submit a written report to the <br /> San Joaquin coutity,Department of Environmental Health,the week beginning Jure 17, 1991. If you <br /> have questions regarding the April santplilig event or this letter report,please call us at(916)638-2085. <br /> Sincerely, <br /> DELTA ENvIRONNIENTAL CONS111TAP;-: "C;' <br /> It &9D <br /> Hug J.Miles <br /> Hug <br /> Project Engineer <br /> Henry A.Dihm,P.E. <br /> Project Manager <br /> HAD:HJM:ecd <br /> Enclosures <br /> cc/enc- Ms.Barbara Mickelson,Delta Environmental Consultants, Inc. <br /> Mr.Jack Bractad,Shell Oil Company <br /> Mr.Jim Maughan,Central Valley Regional Water Quality Control Board <br /> AWWMM <br />