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Jeffery Wong TMa&*qW1&FM10 San Joaquin County Environmental Division 22 December 2003 Page 2 Area 20 is also referred to as the former Western Pacific Rail Road site. The site, currently a vacant dirt lot, is north of West Lindsay Street,between North Harrison and North Madison Streets. Area 20 was originally used as a switching yard for the Western Pacific Rail Road and service to the banner Island site. There are three monitoring wells at Area 3. Previous site investigations were performed at both areas by Treadwell &Rollo in 1996, 1999 and 2000, and others. The DTSC has reviewed the previous investigation findings for Areas 10 and 20 and determined that additional groundwater monitoring is not required for any wells in these areas. PROPOSED WELL DESTRUCTION The DTSC has determined that monitoring wells in Areas 10 and 20 are not in areas with significant groundwater impacts. Per San Joaqin County Environmental Health Department guidance, these wells can be destroyed by pressure grouting the well casings. One well, MW-1 at Area 20, has an obstruction present above the water table and will need to be drilled out and grouted. Since MW-1 at Area 10 has not been located at the surface, we shall attempt to find it with a backhoe or excavator, and abandon if found. Table 1 presents a summary of the existing wells at the site, their construction details and their proposed destruction method. All soil, groundwater, and decontamination water generated during well destruction will be stored onsite pending analytical results. All borings will be destroyed in accordance with California well destruction guidelines and SJCEHD requirements, and well destruction permits will be obtained for all wells. SCHEDULE V4S We plan to destroy all monitoring wells except for MW-1 at Area 10 and MW-I at Area 20 prior to 15 January 2003. The two remaining wells,which require specialized equipment, will be destroyed prior to March 2004. If you have any questions regarding this workplan please call. Sincerely yours, TREADWELL &ROLLO, IN y� Eo o1 o 7� No. 7056 David G. Dixon�G Philip G. Smith,REA II, CPGS Senior Project Manager tP `� Principal 25971002.DGD -1 Attachments: Boring Permit App Figure 1 —Site Plan and Well Locations Table 1 - Summary of Well Construction and Proposed Closure Methods cc: Lorraine Islas—City of Stockton Mayors Office Kitty Walker—Stockton Housing and Redevelopment Department