ARCHIVED REPORTS XR0011667 - Laserfiche WebLink

Home Browse Search

MW2 and MW3. Other VOCs not related to gasoline or diesel were detected at trace concentrations in soil in boring B1 at 20 feet bgs, in boring B6 at 5 feet bgs and in monitoring well MW2 at 5 feet bgs. Benzene was not detected in the soil on the subject_ property. Benzene, however, was detected in monitoring well MWI at 15 micrograms per liter (Agll) and in well 4W2a+ K rrS/1 Potential offsite sources for the benzene k are two (2) Leaking Underground Storage Tank (LUST) sites within 200 feet of the subject property. These LUST sites are the crossgradient former Shell gasoline station at 141 North El Dorado Street to the southwest and the___gradient Arco gasoline station 01- at eCnter Street to tell a west.�T�ese —_sites are__documente have impacted the rL, groundwater in the area with gaso the rom eaking e a s_ ' N ,�r✓ Based on the findings of the Phase II Environmental Assessment and Subsurface Investigation, CRC concludes that TPH and trace amounts of VOCs detected in soil on the subject property do not pose a threat to groundwater. CRC also concludes that because benzene was not detected in the soils, the subject property does not appear to be a likely source for the benzene detected in the groundwater in monitoring wells MWI and MW2. CRC recommends that additional sampling of the groundwater be conducted in order to monitor changes in the levels of benzene detected in the Phase II Environmental Assessment and to prepare for eventual closure. CRC further recommends that a copy of this report be submitted to the San Joaquin County ' Environmental Service for review and comment. CRC also recommends that the status of remedial action on the two (2) LUST sites in the immediate area be monitored. 2.0 INTRODUCTION This report presents the results of the subsurface investigation conducted by CRC at the ' Lighthouse Village School building located at 222 North El Dorado Street in the City of Stockton, San Joaquin County, California (see Figure 1, Topography and Site Location Map, Appendix I). The subject property was formerly an ASB Branch. All field activities were performed in accordance with the "Scope of Work and Work Plan for Subsurface Investigation - Phase II Environmental Assessment" prepared and ' submitted by CRC in January 1995 (Appendix II). This report briefly reviews the site history, field methodology and presents the analytical laboratory results of soil and ' groundwater samples. Health and safety guidelines were observed in conducting all field activities in accordance with the site-specific Health and Safety Plan (Appendix III). 2.1 Purpose The purpose of the investigation was to determine whether the soil and ' groundwater at the subject property have been impacted by past operations of auto-related businesses and to assess whether potential offsite sources of contamination may have impacted the groundwater underneath the site. r CRC Environmental Risk Management,inc. Project N 2100-250-2 American Savings Bank 222 North El Dorado Street November3, 1995 2 Stockton,California