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A E 1 Limited Phase II Subsurface Investigation Work Plan
<br /> 2651 South Airport Way
<br /> Stockton,California 95206
<br /> Consultants
<br /> The purpose of this investigation is to assess the presence/absence of impacted subsurface
<br /> conditions (i.e., soil and soil gas) in the area of the former surface ditch along the southern
<br /> September 10, 2020 portion of the Site.
<br /> Mr. Michael rith 3.0 Geology and Hydrogeology
<br /> Environmental Health Department
<br /> San Joaquin County Environmental Health Department Geologically,the Site is underlain by early Holocene tolate Pleistocene Modesto Formation,which
<br /> 1868 E.Hazeiton Avenue includes alluvial deposits of arkosic gravel,sand, and silt.As described in the Phase I ES4, the
<br /> Stockton, California 95205 depth to groundwater is estimated at 35 to 60 feet below ground surface(bgs)and the direction
<br /> of groundwater Flow is estimated to the east based on previous groundwater monitoring
<br /> Subject: Limited Phase II Subsurface Investigation Work Plan performed at the Site.
<br /> 2651 South Airport Way 4.0 Scope of Work
<br /> Stockton,San Joaquin County,California 95240
<br /> AEI Project No.426967
<br /> AEI was requested to perform an investigation, including the collection of soil and still gas
<br /> Dear Mr.ION: samples,to evaluate if the current and historical Site activities had adversely impacted the Site.
<br /> The following work plan has been prepared by AEI Consultants(AEI)in order N perform a Limited 4.1 Health and Safety,Permitting,and Utility Clearance
<br /> Phase II Subsurface Investigation at the above referenced Site(Figure 1).
<br /> A site-specific health and safety plan will be prepared,reviewed by onsite personnel,and kept onsRe
<br /> 1.0 Site Description for the duration of the fieldwork. Drilling permits will be obtained from San Joaquin County
<br /> Department of Environmental Health for this invesbgatlon.The public underground utility locating
<br /> The Site,which consists of a commercial bakery,is located on the west side of South Airport Way service Underground Service Alert(USA)North 811 will be notified to identify public utilities in the
<br /> in a mixed industrial and residential area of Stockton, California (Figure 1).The property totals work area.AEI will arrange for a private geophysical survey within the area of the former release to
<br /> approximately 17.16 acres and is improved with two one-story buildings totaling approximately evaluate the presence of underground structures, specifically the storm drain line, including
<br /> 114,000 square feet.The Site is currently occupied by Best Foods Express,Inc.On-site operations underground storage tanks,disturbed soils, and/or cavities, using ground penetrating radar(GPR)
<br /> and other geophysical methods. If anomalies are identified
<br /> consist of commercial baking operations. In addition to the on-site buildings, the property is
<br /> identified which require further investigation,than
<br /> improved with asphalt-paved parking areas and associated landscaping.Storm water drainage is the scope of this investigation may need to be altered. In addition, the boring locations will be
<br /> along the south side of the property. cleared from utilities.
<br /> 2.0 Background 4.2 Drilling and Soil Sample Collection
<br /> AEI completed a Oran Phase I Env/ronmenta/Site Assessmm[(ESA)dated August 20, 2020 for AEI will contract a licensed driller to advance four exploratory soil borings at the Site with a dolly-or
<br /> the Site(AEI Project No.426967),which identified a Recognized Environmental Condition(REC) truck-mounted, direct push drilling rig to a maximum depth o 5.5 flietbgs.The tentative locations
<br /> that warranted further assessment Based on the Phase I ESA, evidence of soil contamination of of the proposed borings are shown on the attached figure and include areas adjacent to the storm
<br /> an undetermined origin was identified in a surface drainage ditch located along the southern drain line and junction boxes,if identified. Boring locations are subject to change based on access
<br /> portion of the property in 1990. No information on cleanup was identified.In addition,the Site is and utility locations.
<br /> documented with hazardous waste streams listed as organic liquids and solids,empty containers,
<br /> asbestos-containing waste, oxygenated solvents, hydrocarbon solvents,waste oil and mixed oil, Each soil boring will be logged by AEI staff; soil cores will be logged and described in general
<br /> oil/water separation sludge, polychlorinated biphenyl (PCB) waste, latex waste, halogenated accordance with the Unified Soil Classification System(USCS);soils will be screened with a portable
<br /> liquids, oxygenated solvents, waste oil and mixed oil, and oil/water separator sludge. The organic vapor meter(OVM)or photo-ionizabon detector(PID)and for sensory perception. One(1)
<br /> identified former release of potentially hazardous materials with undetermined testing / soil sample from each of the borings will be selected for the analyses of total petroleum hydrocarbons
<br /> remediation status Was considered a REC. (TPH),VOCs,PCBs and asbestos.
<br /> PMJW No.426967
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