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ENVIRONMENTAL HEALTH H DEPARTMENT SAN JOAQUIN COUNTY �..co` Unit Supervisors Z.. "'-' ? Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. a. n' < m. Director Mike Huggins,R.E.H.S.,R.D.I. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. • �:q; .`p• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. �/FOR,a Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellan,R.E.H.S. Program Manager Mark Barcellos,R.E.H.S. DEC 0 2 2003 JAY MCILRATH JC & M MCILRATH PO BOX 326 STOCKTON CA 95201 RE: JAMAR Service SITE CODE: 1667 4075 Main Street Stockton CA 95212 San Joaquin County Environmental Health Department (SJC/EHD) has reviewed "Third Quarter 2003, Groundwater Monitoring Report"dated November 2003, submitted on your behalf by GHH Engineering, Inc. (GHH) and has the following comments. The report documents a routine quarterly groundwater monitoring and sampling event that took place at your site on September 11, 2003. In correspondence dated August 22, 2003, SJC/EHD informed you that at routine quarterly groundwater monitoring and sampling events all monitoring wells should be opened, allowed to equilibrate to the ambient air pressure, and depth to water measurements taken from all wells prior purging and sampling of any wells. The field notes submitted with this quarterly report indicate that this may not have been done properly, again. The "Hydrodata" sheet included in the report lists a depth to water measurement for each well, along with a date, a time and the measured total depth of the well. The "time" notations on this sheet make it appear that the depth to water measurements were collected over a time interval of two hours and thirty-three minutes, from 11:47AM to 14:20PM. Information provided on the "Well Development/Sampling Documentation Forms" provided for each monitoring well note "initial' depth to water measurements, but the times they were collected do not appear to be documented. Two different time notations were made on these forms. One notes the time that the post-purge depth to water measurement was taken. The other notes the time that the groundwater sample was collected from the well. However, these "sample" times are the same times noted on the "Hydrodata" sheets. The narrative of the report adds further confusion. The narrative states "Depth measurements were taken prior to the purge start times recorded on the field data sheets included in Appendix B". If this is true, then the depth to water measurements were taken over a time period of two hours and twenty minutes, from 11:28AM to 13:48PM. From the information provided by GHH in this report, it appears that either the times of the pre-purge depth to water measurements were not documented, or that the entire process was not performed correctly, again. It is very important that this procedure be performed properly, and that all initial depth to water measurements are taken prior to the initiation of any purging or sampling procedures. Calculation of a correct groundwater gradient and