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Previous work at the nice has shown that the borings to the 40 <br /> r foot depth will be in a sandy, clayey silt to silty sand. Once <br /> the boring is completed to the 40 foot depth a one to two foot <br /> sand base will be poured (clean 03 monteray sand) through the <br /> hollow stem augers. Then the 2 inch Schedule 40 F480 TriLock PVC <br /> casing will be installed with a 2" bottom plug and 5 feet of 0.02" <br /> slot at the bottom with the remainder made up of 2" PVC Schedule <br /> 40 x`480 TriLock pipe to approximately 2 feet above the surface. <br /> Once the casing has been installed clean 03 monteray sand will be <br /> x slowly poured into the annular space between the augers and the <br /> PVC casing, as the augers are staged out of the hole, to guarantee <br /> a sand envelope to the 15 foot depth. <br /> A neat cement seal will be placed in all of the wells at the same <br /> time and will consist of neat cement (12 sack mixture with 5% <br /> bentonite) . The neat cement seal will be placed by gravity pour <br /> from the 15 foot depth to just above the existing ground <br /> elevation. <br /> The well heads will be fitted with a 2" PVC "T" with air tight <br /> locking cap at the top and a sample port with pipe to hose fitting <br /> at the lateral, see Figure 4. These well heads will be glued to <br /> ? the casing using PVC cement. <br /> EXCAVATED SOIL AND REINSATE HANDLINri <br /> All soil produced from the borings will be placed on 10 mil <br /> polyethylene linear and covered with same, if field screening <br /> indicates the presence of hydrocarbons. <br /> All remnsate produced from the cleaning of the auger and sampler <br /> t will be contained on site in 17H 55 gallon drums. <br /> HEALTH AND SAFETY <br /> This site has been classified as Class D protection. Hardhats, _ <br /> gloves, steel toed boots and ear protection are required to be <br /> worn. In the event that field screening indicates that volatile <br /> organic compounds (VOC-*s) exists at the site, all personnel shall <br /> wear appropriate half face cartridge respirator with the black <br /> organic compound cartridges and particle filters. All personnel <br /> must carry identification showing that they are current with <br /> OSHA/SARA training. <br /> 3 <br /> if you have any questions please call (916) 668-5300. <br /> Sincerely yours, <br /> t <br /> George L. Converse <br /> Project Manager/Agent for Hogate Drilling <br /> cc: Mr. John Margowski, Wickland Properties <br /> Mr. Gordon Boggs, RWQCH, Central Valley Region <br /> page 2 <br />