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i <br /> ERM-West,Inc <br /> f1777 Botelho Drive <br /> Suite 260 <br /> Walnut Creek,CA 94596 <br /> (510)946-0455 <br /> a ' a (510)946-9968(Fax) <br /> March 3, 1997 S E P 02 1997 <br /> PERNIIT / SERVICE <br /> IMs Mary Meays <br /> Senior REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street ERM <br /> Stockton, CA 95201 <br /> SUBJECT. 3rd Quarter 1996 Ground Water Monitoring Event <br /> 1325 & 1515 West Weber Avenue <br /> Stockton, California <br />' Dear Ms Meays <br /> On behalf of Catellus Development Corporation (Catellus), ERM-West, Inc , <br /> (ERM) is pleased to submit this letter summarizing the results of the 3rd Quarter <br />� t 1996 Ground Water Monitoring Event recently conducted at Catellus' properties <br /> at 1325 and 1515 West Weber Avenue in Stockton, California <br />' Field activities were conducted from October 10 through October 14, 1996, and <br /> included measuring water levels, sampling the ten onsite wells (Figure 1), and <br /> installing Oxygen Release Compound (ORC) socks in selected wells The field <br />' procedures are described below, followed by a discussion of the water level <br /> measurements and analytical results <br /> 1 <br /> FIELD PROCEDURES/OBSERVATIONS <br />' Water levels and total depths were measured prior to sampling between <br /> approximately 9 20 a m and 10 20 a in on October 10, 1996 Water levels <br />' measured during this sampling event are presented in Attachment A After <br /> measuring water levels, each well was systematically purged of three casing <br /> volumes, and ground water samples were collected and placed into containers <br /> appropriate for the analysis of interest (Fe-2, pH, Conductivity, Nitrate, Chloride, <br /> Dissolved Methane, Dissolved CO2, BTEX, Trimethylbenzene, TPH(g), TPH(d), <br /> Dissolved Mn) Purge records/field notes associated with the sampling event <br /> are presented in Attachment B The sample containers were labeled <br /> appropriately and maintained in chilled coolers until they could be transported <br /> to the laboratory <br /> E A member of the Environmental <br />