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Water Testing update


Gavilan Community College’s main water source is a deep well located across Santa Teresa Blvd. from the campus. The main water line ascends through the hills and connects with the tank which sits above the campus. This tank provides water for the purpose of Drinking, Fire Suppression, and  Irrigation.


The system is treated by a chlorination pumping system and it is sampled by an Independent third party Water Treatment Operator #249734 at a minimum of four times per month. The samples are tested by a local testing laboratory disassociated with the Treatment Operator. The sample results are submitted to the California Department of Public Health  (CDPH) who monitors the testing.


Samples are taken as specified by the CDPH and in accordance with our Sampling Plans.  Samples are taken for the following:

Sample Drawn                                                                  Frequency Sampled                      

Coliform Bacteria:                                                                           Four times per month

E. coli:                                                                                                   Four time per month

Inorganic Chemicals:                                                      Every 36 months

  • Aluminum
  • Antimony
  • Arsenic
  • Barium
  • Beryllium
  • Cadmium
  • Chromium
  • Cyanide
  • Fluoride
  • Mercury
  • Nickel
  • Perchlorate
  • Selenium
  • Thallium


  • Nitrate (NO3)                                                                    Every 12 months
  • Nitrite (N)                                                                           Every 36 months


  • Gross Alpha                                                                        Every 108 months

Regulated VOC (Volatile Organic Compound):   Every 72 months

  • Benzene
  • Carbon Tetrachloride
  • CIS-1,2- Dichloroethylene
  • Dichloromethane
  • Ethylbenzene
  • Methyl-Tertiary-Butyl-Ether (MTBE)
  • Monochlorobenzene
  • Styrene
  • Tetrachloroethylene
  • Toluene
  • Trans-1,2-Dichloroethylene
  • Trichloroethylene
  • Trichlorofluoromethane
  • Vinyl Chloride
  • Xylenes
  • 1,1 – Dichloroethane
  • 1,1- Dichloroethylene
  • 1,1,1 - Trichloroethane
  • 1,1,2- Trichloro-1,2,2-Trifluoroethane
  • 1,1,2- Trichloroethane
  • 1,1,2,2- Tetrachloroethane
  • 1,2- Dichlorobenzene
  • 1,2- Dichloroethane
  • 1,2- Dichloropropane
  • 1,2,4- Trichlorobenzene
  • 1,3- Dichloropropene
  • 1,4- Dichlorobenzene

Regulated SOC (Synthetic Organic Chemical):    Every 108 months

  • Atrazine
  • Simazine
  • 2,4- D
  • Disinfection Byproducts:                                              Every 3 years
  • TTHM    (Byproducts from the 
  • HAA5     chlorination process)                                     
  • Lead:     (Action Level 0.015 mg/L)                             Every 3 years
  • Copper: (Action Level 1.3 mg/L)                                Every 3 years




In October of 2008 samples revealed that eight areas had elevated Lead/Copper levels (>0.015 mg/lead and >1.3 mg/L copper). Per the CDPH the campus was immediately notified, posted signs were placed on the sinks with elevated levels, and replacement of the errant fixtures began immediately.






Additional sample rounds followed to assure compliance:

October 2008                     22 samples drawn            8 elevated           replaced fixtures and flushed lines

December 2008                73 samples drawn            8 elevated           replaced additional fixtures and flushed lines

July 2009                              69 samples drawn            1 elevated           replaced fixture and flushed lines

November 2010                21 samples drawn            0 elevated           no action necessary

February 2011                   21 samples drawn            0 elevated           no action necessary


The next round of lead/copper samples will occur in September 2013. As evident in the dates the sampling frequency becomes greater after samples return below the action level. The reports are all public and continuous communications were distributed to the campus during the course of these activities. I have copies of all the reports on file along with the CDPH if you are interested in looking at them.