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Clayton <br /> LN41IH0:N1AENTAL <br /> CONSULTANTS <br /> f <br /> r <br /> Clayton completed excavation of approadmately 1650 cubic yards of soil and on <br /> aeration as summarized in our report, Soil Excavation and Aeration for Interlard <br /> Corporation'° dated October 19, 1990. This report was submitted to the required <br /> regulatory agencies. <br /> li During excavation, a 504-gallon concrete septic tank was discovered. Clayton <br /> obtained a permit for the removal of this tank. The tank was removed on August 17, <br /> ' 1990. <br /> Monitoring well MW-3 was destroyed to approximately 10 feet bgs during soil <br /> !A excavation activities. The well was previously installed to a depth of 25 feet bgs. <br /> Approximately 15 feet of the well was covered with the backfilling of the excavation <br /> pit. <br /> Th.e San Joaquin County Public Health Services (SJCPHS) stated no further soil <br /> remediation was required at thesite based on our findings, but requested additional <br /> groundwater monitoring and proper abandonment of monitoring well MW-3 and the <br /> domestic water well, as stated in their letter to you, dated November 1, 1990 <br /> (Appendix A). <br /> UATMN <br /> 3.0 EMMINYMIMM <br /> t Clayton commenced field activities for the installation and sampling of the additional <br /> monitoring well at the site on January 8, 1591• We properly abandoned monitoring ,•': <br /> we'll MW-3 and the domestic water well on the same day. All work was performed in <br /> accordance with Clayton's Drilline.-Well Co,�struetion and Sam lin Protocols <br /> included in Appendix B. <br /> f r The installation of monitoring well MW-3B and abandonment of the two wells were <br /> j - - .. <br /> observed by Ms. Eleayor Ratliff,San Joaquin CountyPublic health Services <br /> environmental health inspector. } <br /> Tlte.fciiiowing subsections describe the completion of each of the tasks outlined in <br /> Clayton's work proper 26, 1990. <br /> osal dated Novemb <br /> 3.1 SOU,EOItEHOLE INSTALLATION/iVIONITORING WELL <br /> CON STRUCTION <br /> Before drilling began <br /> work plan was filed wi <br /> :a well construction application a <br /> th. <br /> t '` SJCPHS Environmental Health Division. A copy of this application is included in <br /> .nd' C. Aqua Science Engineers was contracted to install the shallow <br /> App q <br /> E � i geoundwater well under.the directsupervtsionf Clayton personnel._ <br /> _ ... <br /> s' <br /> MW-3B was in3tallud at the southwest corner of the property site downgradient of the <br /> fnrmer,,excavation pit (Figure 2). The'borehole was drilled to a depth of 20 feet bgs <br /> t using a 10-1/2 inch hollow stem atFger from a mobile tru:.k-mounted Srillirtg rig. The <br /> 'borehole was converted into a monitoring well. <br /> 'J - <br /> yy77 ds� .t <br /> X. <br /> v <br /> { ti <br />