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page 2 <br /> 1817 Fresno Ave <br /> PHS/EHD requested in the August 20 , 1998 correspondence that a well survey <br /> be conducted which provides the location of all agricultural , industrial , domestic, <br /> municipal and other wells within a 2000 foot radius of the site, and that this well <br /> survey be included in the work plan . There was no well survey included in the <br /> work plan submitted to PHS/EHD . <br /> Section 2 .2 Installation of Monitoring Wells , on page 2 of the work plan , <br /> describes how the proposed monitoring wells will be constructed . It states that <br /> the sand filter pack will extend "from total depth to six-inches above the top of the <br /> screened interval . A bentonite seal one foot thick will be placed over the filter <br /> pack" . Figure 3 , Proposed Well Construction Details shows a diagram of the <br /> proposed wells as having filter pack extending one foot above the screen interval <br /> and a bentonite seal two feet thick. PHS/EHD recommends the sand filter pack <br /> be placed at least one foot above the screen interval . Please clarify to PHS/EHD <br /> the well construction detail that will be used . Please note that it is highly <br /> recommended by PHS/EHD , per section 13 . 10 . 8 of the San Joaquin County Well <br /> Standards , that surging of newly installed wells occur prior to installation of the <br /> bentonite transition seal. <br /> Please submit an addendum to the work plan addressing the issues discussed <br /> above, as well as the site specific Health and Safety Plan to PHS/EHD by <br /> January 4 , 1999 . <br /> If you have any questions please call Lori Duncan at (209) 468-0337 . <br /> Donna _ eran , REHS , irec or <br /> Environmental Health Division <br /> L�qA I�V�„� <br /> Lori Duncan, REHS Margar Lagorio , ER HS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Doug Guenther, Clearwater Group , Inc. <br />