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I <br /> ,,owhey Pacific Drilling, inc.. <br /> GEO-Technical Construction <br /> 1215 Michigan Street <br /> San Francisco,CA 94107 <br /> Tel: 415-401-7022 -Fax:415-' <br /> April 6, 2011 RECEIVED <br /> San Joaquin County APR 11 2011 <br /> Environmental Health Department <br /> 600 East Main St. ENVIRONMENTAL HEALTH <br /> Stockton, CA 95202 PERMIT/SERVICES <br /> Attention: <br /> Project: SFPUC-v.3.0 00410-4 <br /> HH-935B <br /> Section: San Joaquin Pipeline System-Western Segment <br /> Original permit No. 52444 <br /> Procedures for Destruction of(2) Piezometers Pz-9 & P-10 <br /> 1.- Setup drill site with temporary barriers and cones. <br /> 2.- Remove existing kristy box or stovepipe and concrete with jack <br /> hammer. <br /> 3.-Insert AWJ rod(1.75" OD) inside PVC casing to guarantee hollow stem <br /> augers track original borehole. <br /> 4.- Over drill each piezometer with 8"hollow stem augers to total depth. <br /> 5.- Remove all PVC well casing and sand pack. <br /> 6. Tremie cement grout from bottom of borehole 5'- 8' from surface. Chip <br /> rest of hole to 6" from surface. Place soil last 6". <br /> 7.-Remove casing, sand pack and other debris from site each day. <br /> 8.-All locations are in dirt and will be restored to surrounding grade. <br /> Please call if you have any questions or suggestions. <br /> Sincerely, <br /> Terry Cowhey <br /> Chicago •Lajolla <br /> CA Lic# 351525•SFHRC Certification#C081115396•General Engineering A,B,C-57, <br /> 61,D.09 <br />