Laserfiche WebLink
1 71 i. <br />' QUARTERLY MONITORING REPORT <br /> ART AND ARTISTS <br /> 204 E. Lodi Avenue <br /> Lodi, CA <br /> BACKGROUND <br /> The site is located in a flat commercial area in central Lodi <br /> (Figure 1) . Following removal of a 550-gallon leaded gasoline tank, <br /> three soil borings were installed in August of 1987 and converted <br /> a� to groundwater monitoring wells by Weiss Associates. Hydrocarbon <br /> contamination was detected in soil and water samples, and a <br /> quarterly monitoring program was subsequently initiated by Earth <br /> Systems Environmental in November 1991 . At that time, two of the <br /> three wells were dry. At the direction of San Joaquin County Public <br /> Health Services/Environmental Health Division (EHD) , two <br /> replacement wells were drilled in June 1992 and soil and water <br /> samples from these wells were collected (see GeoAudit Groundwater <br /> Assessment Report dated 5 August 1992) . Hydrocarbon contamination <br />' was again detected in the water, and EHD directed that the wells be <br /> monitored on a quarterly basis, beginning in September 1992 . Due to <br /> scheduling difficulties, the monitoring could not be performed <br /> until October. This report presents the results of the October <br /> monitoring. <br /> PROCEDURES <br /> The standing water was purged and water samples were collected from <br /> the monitoring wells on 23 October 1992 . Samples were obtained from <br /> MW-4 and MW-5 after 5 to 6 gallons (approximately four casing <br /> volumes) of water had been removed and temperature, pH and <br /> conductivity of the groundwater had stabilized (Appendix A) . These <br /> parameters were measured at one gallon intervals using a Hydac <br /> water analyzer. Well MW-1 went dry after one gallon was bailed; it <br /> was allowed to recharge before sampling. Purged water was placed in <br />' a DOT approved 55-gallon drum and stored on-site. <br /> Water samples were collected using a disposable plastic bailer. Two <br />' 40 ml EPA vials and one 1-liter bottle of water were collected from <br /> each well and transmitted in a chilled container to Alpha <br /> Analytical laboratories in Ukiah. Each sample was analyzed for <br /> I total petroleum hydrocarbons (TPH as gasoline) and purgeable <br /> aromatics (BTE&X) in accordance with the appropriate EPA methods. <br /> Sample MW-1/10-23-92 was also analyzed for fecal colliform, at the <br /> request of Ms. Mary Meays of EHD. <br /> FINDINGS <br /> Casing elevations were surveyed relative to a temporary bench mark <br /> with an assumed elevation of 100 feet, and the depth to groundwater <br /> was measured with a Solinist water level meter (Table 1) . The <br /> 1 <br />