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Shaw Environmental, Inc. <br /> 1326 North Market Boulevard <br /> Sacramento, CA 95834-1912 <br /> 916.928.3300 <br /> Fax: 916.565.4356 <br /> 2005OCT 25 ,� �J7� 20 Fax (Billers Only): 916.928.0415 <br /> Shaw® Shaw Environmental, Inc. SA N I , , <br /> ENviizoi fS FdTU TY <br /> NHEALTHb <br /> EPA RTHEt4T <br /> Ms. Vicky McCartney <br /> Senior REHS <br /> ----LOP/Site-Mitigation--.LOP/Site-Mitigation-Unit EV <br /> Environmental Health Department <br /> San Joaquin County <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> October 21, 2005 <br /> RE: Letter Arne ndment to September 8, 2005 Work Plan for Monitoring Well <br /> Installation, Parkinson's ARCO, 3250 West Hammer Lane, Stockton, 95209 <br /> Dear Ms. McCartney: <br /> The purpose of this letter is to clarify aspects of well construction that the LOP/Site <br /> Mitigation Unit requested clarification of in its letter dated approximately September 27. <br /> The following points are made in clarification to concerns identified in the county's letter: <br /> ■ The well will be constructed in accordance with state and county requirements for <br /> boring and well construction, including county Code Section 9-1115.6 Well <br /> Standards Section 13.9.2. <br /> .-P The boring diameter bt ariy:depth will 66 at least 4 inches greater than the <br /> outside diameter of the widest casing or pipe that is installed at that depth. <br /> ■ The inner diameter of the conductor casing will be at least 4 inches greater than <br /> the outside diameter of the well casing. <br /> ■ Dimensional calculations will utilize actual diameters and thickness of pipe walls, <br /> not nominal dimensions. <br /> In accordance with recent discussion with you, Shaw shall determine the drilling method <br /> during the procurement process. Shaw expects that the method will be a cased hole <br /> Method such as.air rotary casing hammer. <br /> Shaw will solicit bids from only drilling firms known to have a variety of drilling expertise, <br /> and also having the equipment for making wide-diameter bores. Shaw's procurement <br /> will explicitly require that construction methods and materials conform to requirements in <br /> this letter. Shaw will utilize a California Professional Geologist who has built monitoring <br /> i <br /> A Shaw Group Company <br />