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_J1 GROUND ZERO ANALYSIS, INC. 1005 AUG 18 cu 1714 Main Street Fscalon,California 95320-1927 $A ti J,0 A 0"'i 'C O U Pd T Y Telephone:(209)838-9888 Uiv N E A T T' p H H E N T h E Facsimile:(209)838-9883 E P 4 R T H E N T August 17,2005 Mr. Michael Infurna San Joaquin County Environmental Health Department 304 East Weber Avenue,Third Floor Stockton,CA 95202 Subject: Former Harry's Auto Mart, 2662 N. Wilson Way, Stockton,CA(Site Code: 1306) Addendum to Workplan for Destruction of Water Supply Well at Frontier Motel Dear Mr.Infurna: At your request, we are writing on behalf of Mr. John Ferraiolo to present you with an addendum to our July 1, 2005 Workplan for the destruction of the inactive water supply well located at the Frontier Motel, 2639 N. Wilson Way, Stockton, CA. In phone conversations, you requested additional detail and clarifications concerning the proposed well destruction. Workplan The inactive water supply well will be destroyed by perforating"the casing and grouting to the surface with sand/cement slurry. The well destruction will be conducted by Water Well Technology, Inc. (C57 License No. 731133). Prior to perforating, down-hole equipment including the pump and piping will be removed and the total depth of the well will be measured. The wellbore will'be video surveyed to document the condition of the casing. The well pad will be removed and a hole at least one foot larger in diameter then the original boring will be excavated around the casing to a depth of at least three feet below grade. The well casing will be cut off approximately six inches above the bottom of the excavation and removed. A 2-inch diameter tremie pipe will be used to fill the wellbore with a 10 sack sand/cement slurry. The well casing will be perforated under the wet slurry using 360-degree explosive booster charges initiated by detonating cord. The booster charges will placed at 10-foot intervals from 15 feet below grade to total depth. After detonation, additional grout will be pumped into the well as necessary to fill the casing to the top and allow for spill-over to form a mushroom cap. The Q excavation will subsequently be backfilled to grade. A blast mat will be used to confine any cement splashback. Water displaced from the wellbore will be contained in drums. Water Well Technology's Blasting Workplan is attached. G:\GROUNDZE\HARRYS\Reports\Workplan\addendumfrl"QUIN COUNTY T s ENVIRONMENTAL HEALTH DEPARTMENT 304,E WEBER AVE THIRD FLOOR STOCKTON CA 95202.(209)468-3421 iproved - 't 13 Approved with changes: See ftme s 0 Disapproved: See Rematks3 � Remarks Date P/JVIE/ Ely ZA4&def!56== Aopro l e .ends only to that is h Is shown and described ht�,eon arcs does nohoriz-firor approve any omission or evi;�;,vlo rxn ,equirements of state laws or local ordinances.