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kT t <br /> 1260 Graphics Drive <br /> Modesto, California <br /> 95351 <br /> a 209.579.2221 <br /> ( w1� Fax 209.579.2225 <br /> ASSOCIATES INC . PAYMENT <br /> APR 141998 <br /> April 14, 1998 pUSAN JOAQUIN BUC HEALTH SOERVIC s <br /> 62574.0001 ENVIRONMENTAL HEALTH DIVISION <br /> Mr. Jeff Wong , <br /> San Joaquin County <br /> ' Public Health Services, EHD <br /> 304 E. Weber Avenue, 3rd Floor <br /> Stockton, CA,95202 <br /> Subject: Workplan for Skimmer Installation, Free Product Removal,. and Skimmer <br /> Maintenance at Smith Canal Pumping Plant, Stockton, California <br /> I <br /> Dear Mr, Wong: <br /> ATC Associates Inc. is presenting this workplan for the installation of a passive skimmer, free <br /> product removal, and skimmer maintenance at the subject site on behalf of the City of Stockton <br /> (Figure 1). This Work is being done at the request of the San Joaquin County PublicHealth <br /> Services Environmental Health Department (PHS/EHD) in correspondence dated January 8, <br /> 1998. The purpose of this scope of work is to remediate free product that has been present in <br /> monitoring well MW4 since 1992. The free product thickness has varied from trace amounts to <br /> 8.41 feet: All fieldwork will be completed in accordance with our Site Specific Health and Safety <br /> Plan on file with PHSBHD. The following paragraphs contain a detailed description of the scope <br /> of work to be performed. <br /> ( SCOPE OF WORK <br /> Free Product Skimmer Installation <br /> 999 i <br /> i <br /> ATC personnel will install a free product skimmer into well MW4 (Figure 2). The skimmer will <br /> I be suspended in the well using a Teflon coated steel cable which will be tied down just outside the <br /> well box. The skimmer will separate floating free product from the groundwater and store the <br /> free product until the skimmer can be emptied by ATC personnel. The skimmer will have a <br /> maximum capacity of almost one-half gallon. The manufacturer's specifications for the Durham <br /> Geo Skimmer are contained in Attachment 1. <br /> Because the top.two-feet.ofPVC pipe in well MW4 is bent the skimmer currently will not fit into <br /> the well. The top two feet of the well casing will have to be excavated, PVC pipe removed and <br /> ( ) replaced, and re-concreted into place. The well will also have to be resurveyed. <br />