ARCHIVED REPORTS XR0006859 - Laserfiche WebLink

Home Browse Search

r I ! 11 I rte y Groundwater Monitoring Report ��EMCON Associates Project: OF90-002.03 ti GENERAL INFORMATION 1.Site: A.Telchert&Son Inc. 2.Address (Figure 1): 103 North E Street City: Stockton State: CaAfomia Zip: 3. Monitoring Quarter. ❑ First ❑ Second Q Third ❑ 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 Joaquln County Public Health Services Telephone: (209)468-3420 7. Secondary Agency: RWQCB, Central Valley Reglon 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 was damaged and MW-2 was destroyed during overexcavation activities,MW-3 through MW-5 are currently dry,and MW-9 is obstructed 32 feet below the ground surface.A soil vapor extraction test was conducted; results indicate that soil vapor extraction is feasible for soil remediation. GROUNDWATER MONITORING DATA I. Monitoring Date: July 26, 1993 N 2. Field Measurements: See attached data forms. 3.Groundwater Flow Direction (Table 1 and Figure 1): northeast 4.Hydraulic Gradient: 0.002 5. Comments: Direction of groundwater flow historically variable but predominantly northeast;prior to fourth quarter 1992 monitoring event,dl rection of flow was southeast. GROUNDWATER ANALYTICAL RESULTS 1.Groundwater Monitoring Well Sampling Frequency(by quell): All wells:quarterly. 2.Analytical Results: Summarized in Table 2;certified analytical reports attached. 3. Comments: Petroleum hydrocarbon concentrations detected are similar to historical analytical results. CONCLUSIONSIRECOMMENDATIONSICOMMENTS Continue quarterly groundwater monitoring;design,construct, and install soil vapor extraction system. Impacted soil cuttings generated during the Installation of monitoring wall MWA 3 were 11 remed ated and igpr ad on an unpaved portion of the site. It is our understanding that no furthee actiori'regardingsoil remediation is required and that the San Joaquin County Department of Public Health Services considers this issue closed. LIMrTATIONS 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: EMCON Associates Signature: �!� �_ � — Title: L,2,, (��Ste,A(r/ 56;7- Date: ] �3 Responsible Pa Signature: ,� � -- Title: Date: -�1"2 4-q3