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Triad Groundwater AssodVates <br /> HYDROGEOLOGISTS& GEOLOGISTS <br /> May 23, 1990 <br /> Mr. Greg Lyon <br /> San Joaquin County Public Health Services <br /> Environmental Health Division tx � <br /> P.O. Box 2009 MAY 2 5 9390 <br /> Stockton, California 95201 tNVIRONMENTAL HEALTH <br /> Subject: Monitoring Well Abandonment and PERMIT/SERVICES <br /> Installation <br /> Moore Petroleum Inc. <br /> 1399 Yosemite Avenue <br /> Manteca, CA <br /> Triad Project No. 10-90-480 <br /> Dear Mr. Lyon: <br /> As we discussed in our phone conversation of May 22, 1990 this <br /> letter is to inform you of Triad Groundwater Associates ' (Triad) <br /> intention to abandon and replace monitoring well MW-3 which was <br /> damaged during removal of underground storage tanks in December, <br /> 1989. This monitoring well will be abandoned by over-drilling the <br /> two-inch diameter well casing and screen utilizing four-inch- <br /> diameter hollow-stem augers. Following removal of all well casing <br /> and screen the borehole will be grouted from top to bottol� with a <br /> cement/bentonite slurry. The slurry will pumped through a tremie <br /> pipe to the bottom of the borehole until cement is observed at the <br /> surface. Following completion of abandonment of MW-3, monitoring <br /> well MW-3A will be installed within about 10 feet of the abandoned <br /> well. The installation of monitoring well MW-3A will follow those <br /> procedures and guidelines presented previously in the Hydrogeologic <br /> Assessment Work Plan for this site. The abandonment of MW-3 and <br /> installation of MW-3A is scheduled for June_12, 1990.. Should this <br /> schedule change I will inform you at the earliest opportunity. <br /> A minimum of 24 hours following installation of monitoring well MW-- <br /> 3A, all monitoring wells at the site will be sampled. Ground water <br /> samples will be submitted to a California-certified laboratory to <br /> be analyzed for ethylene dibromide (EDB) , 1,2-dichloroethane (EDC) , <br /> benzene, toluene, ethylbenzene, xylene (BTEX) , and total purgeable <br /> hydrocarbons (TPH) by EPA method-8260.) Laboratory turn-around time <br /> is typically 12 working days. Following receipt and evaluation of <br /> ground-water analyses I will forward to you our recommendations for <br /> continued monitoring and/or ground-water remediation at this site. <br /> I anticipate that this information can be provided to your office <br /> no later than July 31, 1990. <br /> P.O. Box 1805 Cameron Park,California 95682 (916)676-5941 <br /> (916)676-8018 FAX <br />