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Quarterly Groundwater Monitoring Report EMCON Associates Project: OF90-002.03 GENERAL INFORMATION 1. Site: A. Teichert& Son, Inc. 2. Address (Figure 1): 103 North E Street City: Stockton State: California Zip: 3. Monitoring Quarter: ❑X First ❑ Second Third 0 Fourth Year: 1993 4. Client Contact: George Takemori Telephone: (916) 386-6916 5. EMCON Contact: Mark Thomas Telephone: (916) 928-3300 6. Lead Agency: San Joaquin County Public Health Services Telephone: (209)468-3420 7. Secondary Agency: RWQCB, Central Valley R2gion Telephone: (916) 255-3000 BACKGROUND INFORMATION Three underground storage tanks were removed in October 1986. One underground storage tank was removed in August 1988. The tanks were not replaced. Overexcavation was completed in the vicinity of the tanks, but some impacted soil remained. Soil vapor extraction piping was installed in the overexcavation. Ten groundwater monitoring wells(MW-1 through MW-5 and MW-9 through MW-13) have been installed to date: MW-1 damaged, MW-2 destroyed during overexcavation activities, MW-3 through MW-5 dry; MW-9 obstructed 32 feet below ground surface. A soil vapor extraction test was conducted; results indicate that soil vapor extraction is feasible for soil remediation. GROUNDWATER MONITORING DATA 1. Monitoring Date: _Febreuary22, 1M 2. Field Measurements: See attached data forms. 3. Groundwater Flow Direction (Table 1 and Figure 1): north-northeast 4. Hydraulic Gradient: 0.002 5. Comments: Direction of groundwater flow historically variable but predominantly northeast;prior to fourth quarter 1992 monitoring event, direction of flow was southeast. GROUNDWATER ANALYTICAL RESULTS 1. Groundwater Monitoring Well Sampling Frequency (by well): All wells: quarterly. 2. Analytical Results: Summarized in Table 2,certified analytical reports attached. 3. Comments: Petroleum h drocarbon concentrations detected are similar to historical analytical results. CONCLUSIONSIRECOMMENDATIONS Continue quarterly groundwater monitoring; design, construct, and install soil vapor extraction system. LIMITATIONS The services described in this report were performed consistent with generally accepted professional consulting principles and practices. No other warranty, express or implied, is made. These services were performed consistent with our agreement with our client. This report is solely for the use and information of our client unless otherwise noted. Any reliance on this report by a third party is at such party's sole risk. PREPARED/REVIEWED Consultant: EM� N Associates Signature: _!/ � � �� Title: pryc Date:3 Responsible P Signature: Title: Dater/93 r:�