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•'RNw,a•M..u.: <br /> 3� <br /> u� <br /> CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> 12109 Poway Load,Suite 202, Poway,CA 92064 <br /> Tel: (619) 486-1323 <br /> rF�nuarf �'U, 1992 <br /> Puta l i.c <br /> Health Servi rN M., <br /> San Joaquin County �?1 •, <br /> P.O. Box 2009 <br /> Stockton, Ca gb201 ,JAN 3 <br /> FlvVIRJ 1992 <br /> Mr. Steve Schneider �' <br /> Attn: � i E <br /> p`: 'r�. 11 �tiPiliri <br /> ••�i[ �4'ri�LJ <br /> ADDENDUM <br /> TO <br /> NORK PLAN <br /> 719 E. CHARTER WAY <br /> STOCKTON, CA. <br /> DECEMBER 11, 1991 <br /> Pursuant to our telepho.ae conversation of Jan. 28; , 1,992, we <br /> are submitting this addendum to clarify and modify some of the <br /> Procedures mentioned in the original work plan. <br /> 1. We plana to use slotted casing from the bottom of the well <br /> to within 10 feet of the surface. We are aware we are opening <br /> a Possible conduit to they water table from the upper Zones <br /> which may be contaminated. We will only place the slotted <br /> _t casing as designed if no pearched water zones are encountered <br /> there were none in the original wells) and if the material <br /> drilled is mostly clean, according to our OVA readings taken <br /> during drilling. We would feel a middle range reading on the <br /> OVA meter in a clay unit as not dangerous for future <br /> contaminati;a, whereas the same reading in a sand or silt would <br /> cause us to cancel the present design and comPlete tb e well. <br /> with slotted casing only 5 to 10 feet above the water table, <br /> 2. The soil and wate samples will• be tested as follows: <br /> is <br /> ITEM Detection Limits <br /> Soil BTEX - EPA 6020 Benzene <br /> Toluene 5. 0 ppb <br /> 5.Z ppb <br /> Ethyl Benzene"5•(! ppb <br /> Each Xylene 5. C1 ppb <br /> r TPH Soiis - D.O. H. S. /LUFT Manual <br /> 1. 0 ppm <br /> Water BTEX - EPA 602 <br /> Benzene 0. 5 PPb <br /> Tcluane 0.5 ppb <br /> Ethyl Benz`ne 0. 5 ppb <br /> Each Xylene 0.5 ppb <br /> TPH Water - D.0.H. S. /LUFT Manual <br /> 50.0 ppb <br /> 3. We have rewritten our QA/QC: Controls and incorporated your <br /> ideas. for well :.,urging; prior to placing the benti�ni to Seal. <br /> w <br />