WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

TMOMMIlBA llo • Results of the subsurface investigation; • Well destruction activities; and 3 . A Work Plan for the installation and sampling of three shallow zone and three deep zone groundwater monitoring wells. 2.0 SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS The Site is located in downtown Stockton at 130 North Hunter Street between East Channel and East Weber Street (Figure 1). Until January 2005, the Site consisted of a large warehouse building that previously operated as a parking lot and auto service center for San Joaquin County. ` J In 1996 Fisch Environmental, removed two gasoline USTs (8,000 and 1,000 gallons) from the sidewalk in front of the Site (Figure 2). The product lines associated with the USTs trended approximately 30,4eet ti from the USTs to a pump island located in the building, and these were also removed . Soil contamination was encountered below the USTs and impacted soil was excavated and disposed of off Site. To evaluate potential groundwater impacts from the gasoline release, four shallow monitoring wells,MW-1 through ', ° Lt MW-4 (Figure 2), were installed by Ramage Environmental Inc. (Ramage) in July 2002. From July 2002 until August 2004 the groundwater monitoring ,wells were sampled as part of an ongoing groundwater + i monitoring program conducted under the oversight of the SJCEHD. Results of quarterly monitoring can be reviewed in the Ramage report titled Groundwater Monitoring Report Second and Third Quarters 2004, San Joaquin County Parking Garage (Ramage, 2004). Historical soil and groundwater sampling results can be found in Tables 1 and 2. % Treadwell & Rollo conducted soil and groundwater investigations during 2004 and 2005, and destroyed the four existing groundwater monitoring wells at the Site in 2005,prior to re-development. Prior to the well destruction activities in February 2005, Treadwell & Rollo conducted the fourth quarter 2004 groundwater monitoring on 15 December 2004. The results of this quarterly monitoring for the fourth quarter of 2004 are presented in Section 4.0. Groundwater samples were analyzed for the same analytes requested by SJCEHD and performed by Ramage during previous monitoring. Well destruction activities are presented in Section 6.0. 2 25971201 . DGD 6 February 2008