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RESNA WATERWORK CORP. <br /> INDUSTRIES <br /> January 9, 1991 C(D <br /> Mr. Steve Schneider <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Marital Deduction Trust Site, 601 South Ventura, <br /> Stockton, CA <br /> Dear Mr. Schneider: <br /> Per the recommendations of our Pro lem Assessment Report dated <br /> November 29, 1990, the groundwater monitoring wells at the sub- , <br /> ject site were resampled and monito ed on November 14, 1990. The <br /> monitoring data and analytical results are presented here as an <br /> addendum to the November 29, 1990 PPR. Also enclosed are copies <br /> of the laboratory data sheets and chain of custody form for the <br /> August 23, 1990 samples which were inadvertently omitted from <br /> Appendix V of the PAR. <br /> The results confirm petroleum hydrocarbon presence indicated by <br /> previous results from the PAR. However, the results are somewhat <br /> lower than prior samples. Since no MCL has been established for <br /> either TPHG or TPHD, only`. benzene (4 . 6 ppb) slightly exceeds the <br /> state MCL for water of 1.0 ppb. We anticipate the levels to <br /> continue to decrease over time due to natural biodegradation. <br /> Continued groundwater monitoring with no further investigation is <br /> warranted at this site due to the following considerations: <br /> 1. The source of the contamination has been removed. <br /> 2. The levels of dissolved constituent contamination do not <br /> reflect direct contact with free product. <br /> 3. Contaminant characteristics indicate degraded gasoline demon- <br /> strating that natural biodegradation is occurring. <br /> 4. Clayey soils would mitigate contaminant migration. <br /> 1710 MAIN STREET . ESCALON, CA 95320 • (209) 838-3507 <br /> 2350-A WALSH AVENUE • SANTA CLARA, CA 95051 . (408)496-1249 <br />