SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Jerry & Marleta Castro • - 3 - • September 8, 2011 Petroleum H drocarbon Constituent Concentration ContaminantSoil (mg/kg) Water u /L WQOs Maximum Latest Maximum Latest (ug/L) * June 2011 TPH NA NA 220,000 210,000 5 Benzene NA NA 11,000 1,000 0.15 Toluene NA NA 34,000 3,300 42 Eth (benzene NA NA 20,000 7,200 29 Xylenes NA NA 1 34,000 31,000 17 MTBE NA NA 2,900 39 5 TBA NA NA 320 NA 12/1,200- 1,2-DCA NA NA 220 19 0.5 NA: Not Analyzed, Not Applicable or Data Not Available mg/kg: milligrams per kilogram, parts per million ug/L: micrograms per liter, parts per billion WQOs: Water Quality Objectives According to GeoTracker,wells a California Department of Public Health Notification Level/Response Level Site Description The Site is located at 4405 Pacific Avenue in Stockton, California and is an active car wash. The Site is bounded by a residence to the west, a business to the north, Pacific Avenue to the east and West Bianchi Road to the south. The surrounding land use is mixed residential and commercial. Site History/Assessments In November 1991, a release of fuel hydrocarbons was identified by subsurface monitoring equipment. To date, 40 monitoring wells have been installed and 11 wells are currently monitored regularly. A Site map showing the location of the current USTs, monitoring wells and groundwater level contours is provided at the end of this five year summary. t3 Remediation Summary• G Free Product: Free product noted in MW). sheen noted in MW4 in June 2011 • Soil Excavation: Unknown • In-Situ Soil/ Groundwater Remediation: Dual phase extraction, pending General Site Conditions Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, silt and clay. The depth to groundwater varies seasonally between 24 to 31 feet bgs and the groundwater gradient is northeast at approximately 0.003 feet/foot.