ARCHIVED REPORTS_XR0012986 - Laserfiche WebLink

Home Browse Search

Quarterly Report - December 1998 CHAPIN BROS., INC. 1766 Monte Diablo Avenue, Stockton, California 1.0. INTRODUCTION At the request of Mr. Russell Chapin,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California. The work completed included quarterly ground water monitoring activities conducted on 30 December 1998. Soil and ground water remediation activities at the site are on-going. The site setting is illustrated in Figure 1 -Location Map. Structures and well locations on or near the site are illustrated in Figure 2 -Site Plan. Site history and findings from previous investigations and monitoring events at the site are summarized in Problem Assessment Report (PAR) prepared by Science & Engineering Analysis Corporation(SEACOR) dated 22 July 1994 and in the Quarterly Report-September 1995, prepared by AGE, dated 03 October 1995. 2.0. PROCEDURES Ground water monitoring activities were performed in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigation and remediation of underground storage tank (UST) sites, and were performed in accordance with the approved Work Plan Addendum, dated 07 April 1997. 2.1. MONITORING WELL PURGE PROCEDURES On 30 December 1998,a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-I through MW-7 relative to the tops of the well casings. The ground water elevations were calculated by subtracting the depths to ground water from the surveyed well casing elevations (Table 1). After recording the depth to ground water measurements, monitoring wells MW-I through MW-7 and vapor well VE-6 were purged using a two-stage purge pump. A minimum of three well volumes of water was removed from each well. Ground water parameters (temperature,pH and conductivity) of purged ground water were measured at two-gallon (MW-2 through MW-7), five-gallon (VE-6) and ten-gallon (MW-1) intervals using an ICM model 52200 water analyzer. Dissolved oxygen measurements of ground water were collected using a YSI-55 dissolved oxygen meter. Advanced GeoEnviranmental,Inc.