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Environmental/Engineeling/%•••�••N'a••+� March 30, 1993 Job No. 4780200 Public Health Services, San Joaquin County APR 0 2 11093 445 North San Joaquin Street Stockton, CA 95201 w NV ERMI /SER HEALTH PERMIT/SERVICES ATTN: Ms. Mary F. Meays SUBJECT: WORKPLAN ADDENDUM 820 South American Street Stockton, California Dear Ms. Meays: Pursuant to your request EzC, Inc. is submitting this addendum to our workplan for the above mentioned subject site. Our original workplan submitted to your office is dated December 23, 1992. The following additional work has been proposed for the subject site as detailed in our proposal dated February 9, 1993. • Advance boring B-2 below 20 feet and collect samples at 25, 30, and 35 feet below the ground surface (bgs), or to the first encounter of groundwater, whichever is deeper. The soil samples collected above the groundwater level will be held at our office for subsequent analysis. We will only analyze the water sample and soil interface sample from B-2. • Advance a soil boring at sample point B-3 and collect samples at 5-foot intervals to the first encounter of groundwater. All soil samples except the interface sample will be held for possible future analysis. The only laboratory analysis will be performed on the water sample and soil interface sample collected from B-3. • The soil sample collected from boring B-2 will be analyzed for total petroleum hydrocarbons (TPH) as gasoline, including the benzene, toluene, ethyl benzene, and xylene (BTEX) constituents. • The soil sample collected from boring B-3 will be analyzed for TPH as diesel, including the BTEX constituents. • The groundwater grab samples collected from B-2 and B-3 will be analyzed for both TPHd and TPHg and BTEX constituents. • All soil sample analyses will be performed on a normal 10-working day turnaround cycle. 1220 Crossman Avenue. Suite 200•Sunnyvale. California 94089•(408)747-1414 •FAX[408)745-1OB9 `VaU