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Advanced GeoEnvironmental, Inc . 04 April 2006 ; AGE-NC Project No 99-0624 �� `� �� LE D 7 2UG6 Mr Harlin Knoll EWPOMIEN[ HDALTH San Joaquin County Environmental Health PWMIT/SERVICES 304 East Weber Avenue Stockton, CA 95202 Subject: Ground Water Batch Removal Report of Findings -January 2006 FLAME MINI-MART 1301 West Kettleman Lane, Lodi, California Dear Mr Knoll In accordance with a San Joaquin County Environmental Health Department letter directive, dated 12 August 2005,Advanced GeoEnvironmental,Inc (AGE)performed aground water batch removal event between 23 and 27 January 2006 at the Flame Mini Mart, 1301 West Kettleman Lane, Lodi, • Calrfomia (site) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 AGE utilized a 3 horsepower, Central Pnuematic electric air compressor and a submersible, fluid pneumatic extraction pump manufactured by QED (model AP-2) to continuously extract ground water from on-site well MW-2 at an approximate rate of 1 gallon per minute Extracted ground water was stored on-site, in a 4,000-gallon poly tank supplied by Baker Tanks Depth to ground water measurements were collected on a daily basis from on-site wells MW-1 through MW-4,and MW-6 through MW-8, measurements were collected from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevations for each well were determined by subtracting the measured,depth to ground water from the surveyed casing elevation (Table 1) Based on depth to water field measurements, a maximum ground water draw-down of approximately 2 32 feet was measured from well MW-2 during ground water extraction activities, however, ground water levels appeared to be unaffected by ground water extraction activities at all the other well locations Depth to water field measurements collected during the ground water batch removal event are summarized in Table-1 Grab water samples were collected on a daily basis from the extracted ground water discharge at MW-2 Each water sample was transferred into three 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18%hydrochloric acrd as a sample preservative After collection,the samples were properly labeled, placed in a chilled container and transported under chain of custody to Cal Tech t. Environmental Laboratories(CTEL), a State of California Department of Health Services-certified 837 Shag Road Stockton California 95215 Telephone (209)467-1006 F'as (209)467-1 1 18