ARCHIVED REPORTS_XR0005219 - Laserfiche WebLink

Home Browse Search

i 1.0 INTRODUCTION USA Petroleum Corporation (USA) has retained Park Environmental Corporation (Park) to represent USA in matters pertaining to environmental issues at its facility located at 2132 Mariposa Road, in Stockton, California (Figure 1) Mr Charles Nichols of USA has authonzed Park to prepare this workplan for assessment of soil and groundwater at the subject site San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has requested that three new groundwater monitoring wells be installed at the subject site to replace the three shallow monitoring wells that are now dry due to the declining water table in the area Chemicals previously detected in groundwater have been reported to be gasoline constituents The source of this product is unknown at this time There is a need to install the additional monitoring wells and begin the quarterly monitoring program as requested by the County There is also a need to evaluate the source(s) of the release(s) 1.1 Purpose The purpose of the investigation described in this workplan includes the following • To replace existing groundwater monitoring wells that are too shallow to reach current groundwater levels • 0 To begin quarterly groundwater monitoring • To assess the groundwater flow direction and hydraulic gradient • To evaluate potential sources of on-site or off-site releases • To develop a remedial strategy, if appropriate 12 Scope of Work The scope of work to be performed by Park includes the following • Development of a site-specific Site Safety Plan (SSP) • Obtain all required permits for the dulling and installation of groundwater monitoring wells • Drill and install three replacement groundwater monitoring wells to depths of approximately 75 feet below the ground surface (bgs) It is anticipated that first groundwater is at approximately 55 feet bas A 1125J I WP 1