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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2 ;2 Unit Supervisors <br /> Q ;..� Donna K.Heran,R.E.H.S. <br /> W, :< 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> cq: iR �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Co R.ER.E.H.S.Man Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JIM PARKINSON SEP 2 7 2005 <br /> PARKINSON'S ARCO <br /> 3250 W HAMMER LANE <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO SITE CODE 2224 <br /> 3250 W Hammer Lane RO: 709 <br /> Stockton, CA 95209 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan <br /> for Monitoring Well Installation, dated September 8, 2005, prepared and submitted on <br /> your behalf by Shaw Environmental, Inc. (Shaw). Although this work plan describes the <br /> general construction of the proposed monitoring well, it does not explain in detail the <br /> dimensions of the conductor casing nor the drilling method to be used to construct the <br /> monitoring well. <br /> San Joaquin County requires monitoring wells to be constructed following the Well <br /> Standards in accordance with San Joaquin County Ordinance Code Section 9-1115.6. <br /> Well Standards' Section 13.9.2 specifically states that the monitoring well borehole <br /> diameter shall be at least 4 inches greater than the outside diameter of the conductor <br /> casing. The inner diameter of the permanent conductor casing shall in turn be at least 4 <br /> inches greater than the outside diameter of the well casing. Because this work plan does <br /> not give specifics as to the inside and outside diameter of the conductor casing, EHD can <br /> not determine whether this work plan meets these requirements and will not approve the <br /> work plan as submitted. <br /> Please submit an addendum to this work plan by October 28, 2005, that includes the <br /> drilling method to be used for installing this monitoring well, along with specific <br /> dimension for the borehole, conductor casing, and well casing. Include a well <br /> construction diagram in this addendum. <br /> By letters dated August 24, 2004, and May 27, 2005, EHD requested results from the <br /> well survey conducted by IT Corporation in May 2002, as EHD did not have a record of <br /> this report. EHD still has not received this well survey report. You are directed to <br /> submit this report to EHD by October 28, 2005. <br />