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t Nd* l . . .� _ . '-r International Incorporated 93 FEB23 °H 1 12 February 22, 1999 Project No.: 7G600-037-01 Ms. Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Avenue Stockton, California 9.5201 Re: Groundwater Monitoring Well Abandon neat ARCO Service Station 4434 501 W. Kettleman Lane Lodi, California Dear M.s. Lagorio: This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ARCO Products Company, documents the abandonment of seven groundwater monitoring wells (W-4, W-5, W-7, W-8, W-10, W-1 1, and W-12) at the site referenced above. Well abandonment was approved by San Joaquin Coun y Public Health Services as outlined in their letter for No Further Action, dated February 7 1997. Groundwater monitoring wells W-4, W-5, W-7 -8, W-10, W-1 1, and W-12 were abandoned on December 22, 1998, in accordance with San Joaquin County requirements and with Bulletin 74-90, California Well Standards, California Department of Water Resources, June 1991 . Prior to the wells being abandoned, the depths of the wells were measured to verify that there were no obstruction to the total depth of the wells. All wells were clear of obstruction,,;, Groundwatermonitoring wells W-4, W-10, V1W-1 1 and W-12 were abandoned by pressure grouting from the bottom up with neat cement to ithin 1 foot of surface grade. The well boxes were then removed and the well was compl ted to surface with concrete. Wells W-5, W-7, and W-8 were abandoned by pressure routing from the bottom up with neat cement to the top of the well box, Well boxes at -5, W-7, and W-8 were left in place at the request of Mervyn's (property owner). It iso r understanding that the owner of the Mervyn's property intends to remove the well boxes during future re-surfacing of the parking lot. 9912 Business Park Drive, Suite 100, Sacramento, CA 95827 (916)364-1880(916)364-1889 FAX wwzv.secor-com