Laserfiche WebLink
1 <br /> Ell�yt® <br /> 1 <br /> iMr James L Barton <br /> 1 December 2, 2004 <br /> Page 2 <br /> 1 installed to address the remediation of petroleum hydrocarbons present in sod and groundwater <br /> beneath the Wards site The remedial system was put into full operation in November 1999, and <br /> was in operation until December 2000 when the auto service center and remedial system were <br /> 1 shut down due to Wards filing bankruptcy During its operation, the Wards remedial system <br /> removed approximately 8,000 pounds (Ibs) of hydrocarbons <br /> Groundwater monitoring at the Wards site has been conducted since 1993 Groundwater <br /> monitoring activities for the Wards site and the Unocal site, for the most part, were conducted <br /> simultaneously and coordinated by the various consultants representing the two entities The <br /> former Wards site was redeveloped into a restaurant The former Wards building was demolished <br /> 1 and the parking lot raised and resurfaced Well casing elevations and locations were resurveyed <br /> for all wells <br /> Former Unocal Station No 5098 was operated at 5606 Pacific Avenue, Stockton, California <br /> between approximately 1955 and 1985 In 1985, the station was closed and the USTs removed <br /> After completing sod and groundwater investigations Unocal excavated approximately 6,000 cubic <br /> 1 yards of sod from the site in 1988 The excavated sod was aerated, and based on the analytical <br /> testing results associated with the aerated sod, 5,800 cubic yards of the aerated sod was reused <br /> on-site as fill, and 200 cubic yards transported off-site for disposal On August 25, 1989, the <br /> RWQCB issued a letter for the former Unocal site at 5606 Pacific Avenue confirming that the soil <br /> contamination at the site had been adequately cleaned up, but the extent of groundwater impact <br /> had yet to be defined <br /> 1 San Joaquin Delta College (Delta College) operated a groundwater extraction well identified as <br /> the "Robmhood Irrigation Well" (RIW) also known as the Delta College Well The RIW was <br /> located southwest of the intersection of Robtnhood Drive and Pacific Avenue The RIW was <br /> 1 installed in 1950 and was reported to be 322 feet deep with perforations in multiple zones <br /> beginning at depths as shallow as 40 feet below ground surface (bgs) According to the Water <br /> Well Driller's Report for the RIW, "no strata were sealed against pollution" Groundwater from the <br /> 1 RIW was formerly used to irrigate portions of Delta College's campus Groundwater monitoring <br /> data for the site show that historical pumping of the RIW influenced and changed the natural <br /> direction of groundwater flow in the area from easterly, to south southwesterly, t e , towards the <br /> 1 RIW <br /> Sampling of the RIW by Unocal and/or Wards for dissolved petroleum constituents began in 1997 <br /> and continued through June 15, 2000 In August 2000, Delta College students and staff <br /> complained of a gasoline odor from the water derived from the RIW As requested by the <br /> RWQCB, the RIW was taken out of service as of 6 00 AM August 22, 2000 and RIW was <br /> abandoned in August 2001 <br /> In February 2001, seven wells (MW-18D, MW-23S, MW-23D, MW-24S, MW-24D, MW-25S, and <br /> MW-25D) were installed to assist in defining the vertical and lateral extent of hydrocarbon <br /> impacted groundwater at the Unocal site and around the Robinhood Irrigation Well In <br /> September 2001, four additional wells (MW-8D, MW-9, AS-26 and MW-27) were installed to <br /> further define vertical and lateral hydrocarbon-impacted groundwater <br /> 11QcsacramentolprotectslProjects10694015098 293TinalkReportsW%RSE Results Report doc <br /> 1 <br />